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1. Nudibranch predation boosts sponge silicon cycling

Author: López-Acosta, María, Potel, Clémence, Gallinari, Morgane, Pérez, Fiz F., and Leynaert, Aude
Published: 2023
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2. New guidelines for the application of Stokes’ models to the sinking velocity of marine aggregates

Author: Laurenceau-Cornec, Emmanuel C., Le Moigne, Frédéric A. C., Gallinari, Morgane, Moriceau, Brivaëla, Toullec, Jordan, Iversen, Morten H., Engel, Anja, and De La Rocha, Christina L.
Published: 2020

3. Effect of P depletion on the functional pools of diatom carbohydrates, and their utilization by bacterial communities

Author: Labry, Claire, Delmas, Daniel, Moriceau, Brivaëla, Gallinari, Morgane, Quere, Julien, and Youenou, Agnes
Published: 2020

4. HIPPO environmental monitoring: impact of phytoplankton dynamics on water column chemistry and the sclerochronology of the king scallop (Pecten maximus) as a biogenic archive for past primary production reconstructions

Author: Siebert, Valentin, primary, Moriceau, Brivaëla, additional, Fröhlich, Lukas, additional, Schöne, Bernd R., additional, Amice, Erwan, additional, Beker, Beatriz, additional, Bihannic, Kevin, additional, Bihannic, Isabelle, additional, Delebecq, Gaspard, additional, Devesa, Jérémy, additional, Gallinari, Morgane, additional, Germain, Yoan, additional, Grossteffan, Émilie, additional, Jochum, Klaus Peter, additional, Le Bec, Thierry, additional, Le Goff, Manon, additional, Liorzou, Céline, additional, Leynaert, Aude, additional, Marec, Claudie, additional, Picheral, Marc, additional, Rimmelin-Maury, Peggy, additional, Rouget, Marie-Laure, additional, Waeles, Matthieu, additional, and Thébault, Julien, additional
Published: 2023
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5. Predation data of the sponge-feeding nudibranch Doris verrucosa on the sponge Hymeniacidon perlevis

Author: Ministère de la Recherche et des Technologies (France), Xunta de Galicia, López-Acosta, María [0000-0002-0233-8457], Gallinari, Morgane [0000-0002-2274-8162], Pérez, Fiz F. [0000-0003-4836-8974], Leynaert, Aude [0000-0001-8226-3733], López-Acosta, María [lopezacosta@iim.csic.es], López-Acosta, María, Potel, Clèmence, Gallinari, Morgane, Pérez, Fiz F., Leynaert, Aude, Ministère de la Recherche et des Technologies (France), Xunta de Galicia, López-Acosta, María [0000-0002-0233-8457], Gallinari, Morgane [0000-0002-2274-8162], Pérez, Fiz F. [0000-0003-4836-8974], Leynaert, Aude [0000-0001-8226-3733], López-Acosta, María [lopezacosta@iim.csic.es], López-Acosta, María, Potel, Clèmence, Gallinari, Morgane, Pérez, Fiz F., and Leynaert, Aude
Abstract: This file includes the metadata of the survey of the predation activity of the nudibranch Doris verrucosa on the sponge Hymeniacidon perlevis
Published: 2022

6. Revisiting the biogenic silica burial flux determinations: A case study for the East China seas

Author: Zhu, Dongdong, Sutton, Jill, Leynaert, Aude, Treguer, Paul, Schoelynck, Jonas, Gallinari, Morgane, Ma, Yuwei, Liu, Su Mei, Zhu, Dongdong, Sutton, Jill, Leynaert, Aude, Treguer, Paul, Schoelynck, Jonas, Gallinari, Morgane, Ma, Yuwei, and Liu, Su Mei
Abstract: IntroductionThe Coastal and Continental Margin Zones (CCMZs) contribute to 40% of the total burial flux of biogenic silica (bSi) of the world ocean. However, the accurate determination of the bSi content (bSiO2%) in marine sediments remains a challenge. The alkaline methods commonly used to quantitatively determine bSiO2% can completely digest the amorphous silica of diatoms but are less effective at digesting radiolarians and sponge spicules. In addition, the lithogenic silica (lSi) found in sediments is partly digested during these alkaline extractions, which can bias the accuracy of the determined bSiO2%. This is of importance in CCMZs where the lSi:bSi ratio is high. MethodsIn this study, we examined sediments collected in the CCMZs of East China seas, an environment of peculiar interest given the large amount of lSi deposited by the Yellow River and the Yangtze River. Results and discussionThe results show that alkaline digestions using stronger solutions and pretreatment steps resulted in an overestimate of the bSiO2% due to increased leaching of silica mainly from authigenic silicates and clays, whereas weak digestions underestimated the bSiO2% owing to incomplete digestion of sponge spicules. We found that the use of the Si/Al method accurately corrects for the lSi fraction in marine sediments, and thereby improves the determinations of bSiO2% in the sediments of East China seas CCMZs. Ensuring full digestion of all bSi remainschallenging, in particular for sponge spicules, motivating both verifications via microscopy and longer extraction times. To emphasize the influence of these methodological differences, we revised the bSi burial flux in the East China seasand provide a new estimate of 253 (± 286) Gmol-SiO2 yr-1, which is one third of theprevious estimates. We discuss the potential contribution from radiolarian andsponges and we propose a new general protocol for the determination of bSi insediments that minimizes the methodological bias in bSi determin
Published: 2023
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7. HIPPO environmental monitoring: impact of phytoplankton dynamics on water column chemistry and the sclerochronology of the king scallop (Pecten maximus) as a biogenic archive for past primary production reconstructions

Author: Siebert, Valentin, Moriceau, Brivaela, Froehlich, Lukas, Schoene, Bernd R., Amice, Erwan, Beker, Beatriz, Bihannic, Kevin, Bihannic, Isabelle, Delebecq, Gaspard, Devesa, Jeremy, Gallinari, Morgane, Germain, Yoan, Grossteffan, Emilie, Jochum, Klaus Peter, Le Bec, Thierry, Le Goff, Manon, Liorzou, Celine, Leynaert, Aude, Marec, Claudie, Picheral, Marc, Rimmelin-maury, Peggy, Rouget, Marie-laure, Waeles, Matthieu, Thebault, Julien, Siebert, Valentin, Moriceau, Brivaela, Froehlich, Lukas, Schoene, Bernd R., Amice, Erwan, Beker, Beatriz, Bihannic, Kevin, Bihannic, Isabelle, Delebecq, Gaspard, Devesa, Jeremy, Gallinari, Morgane, Germain, Yoan, Grossteffan, Emilie, Jochum, Klaus Peter, Le Bec, Thierry, Le Goff, Manon, Liorzou, Celine, Leynaert, Aude, Marec, Claudie, Picheral, Marc, Rimmelin-maury, Peggy, Rouget, Marie-laure, Waeles, Matthieu, and Thebault, Julien
Abstract: As part of the HIPPO (HIgh-resolution Primary Production multi-prOxy archives) project, environmental monitoring was carried out between March and October 2021 in the Bay of Brest. The aim of this survey was to better understand the processes which drive the incorporation of chemical elements into scallop shells and their links with phytoplankton dynamics. For this purpose, biological samples (scallops and phytoplankton) as well as water samples were collected in order to analyze various environmental parameters (element chemical properties, nutrients, chlorophyll a, etc.). Given the large number of parameters that were measured, only the major results are presented and discussed here. However, the whole dataset, which has been made available, is much larger and can potentially be very useful for other scientists performing sclerochronological investigations, studying biogeochemical cycles or conducting various ecological research projects. The dataset is available at https://doi.org/10.17882/92043 (Siebert et al., 2023).
Published: 2023
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8. Nudibranch predation boosts sponge silicon cycling

Author: Agence Nationale de la Recherche (France), Xunta de Galicia, López-Acosta, María, Potel, Clèmence, Gallinari, Morgane, Pérez, Fiz F., Leynaert, Aude, Agence Nationale de la Recherche (France), Xunta de Galicia, López-Acosta, María, Potel, Clèmence, Gallinari, Morgane, Pérez, Fiz F., and Leynaert, Aude
Abstract: Diatoms play a key role in the marine silica cycle, but recent studies have shown that sponges can also have an important effect on this dynamic. They accumulate large stocks of biogenic silica within their bodies over long periods, which are thought to vary little on an intra-annual scale. The observation of an abrupt decline in sponge biomass in parallel with large increases in abundance of a spongivorous nudibranch (Doris verrucosa) led us to conduct a year-long study on the effect of nudibranch predation on the silicon budget of a sponge (Hymeniacidon perlevis) population. After 5 months of predation, the abundance of sponge individuals did not change but their biomass decreased by 95%, of which 48% was explained by nudibranch predation. About 97% of sponge spicules ingested by nudibranchs while feeding was excreted, most of them unbroken, implying a high rate of sponge silica deposition in the surrounding sediments. After predation, sponges partially recovered their biomass stocks within 7 months. This involved a rapid growth rate and large assimilation of dissolved silicon. Surprisingly, the highest rates of silicon absorption occurred when dissolved silicon concentration in seawater was minimal (< 1.5 µM). These findings suggest that the annual sponge predation-recovery cycle triggers unprecedented intra-annual changes in sponge silicon stocks and boosts the cycling of this nutrient. They also highlight the need for intra-annual data collection to understand the dynamics and resilience of sponge ecosystem functioning
Published: 2023

9. Revisiting the distribution of oceanic N2 fixation and estimating diazotrophic contribution to marine production

Author: Tang, Weiyi, Wang, Seaver, Fonseca-Batista, Debany, Dehairs, Frank, Gifford, Scott, Gonzalez, Aridane G., Gallinari, Morgane, Planquette, Hélène, Sarthou, Géraldine, and Cassar, Nicolas
Published: 2019
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10. Revisiting the biogenic silica burial flux determinations: A case study for the East China seas

Author: Zhu, Dongdong, primary, Sutton, Jill N., additional, Leynaert, Aude, additional, Tréguer, Paul J., additional, Schoelynck, Jonas, additional, Gallinari, Morgane, additional, Ma, Yuwei, additional, and Liu, Su Mei, additional
Published: 2023
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11. Interactions between microplastics and phytoplankton aggregates: Impact on their respective fates

Author: Long, Marc, Moriceau, Brivaëla, Gallinari, Morgane, Lambert, Christophe, Huvet, Arnaud, Raffray, Jean, and Soudant, Philippe
Published: 2015
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12. The Green Edge cruise: investigating the marginal ice zone processes during late spring and early summer to understand the fate of the Arctic phytoplankton bloom

Author: Bruyant, Flavienne, primary, Amiraux, Rémi, additional, Amyot, Marie-Pier, additional, Archambault, Philippe, additional, Artigue, Lise, additional, Barbedo de Freitas, Lucas, additional, Bécu, Guislain, additional, Bélanger, Simon, additional, Bourgain, Pascaline, additional, Bricaud, Annick, additional, Brouard, Etienne, additional, Brunet, Camille, additional, Burgers, Tonya, additional, Caleb, Danielle, additional, Chalut, Katrine, additional, Claustre, Hervé, additional, Cornet-Barthaux, Véronique, additional, Coupel, Pierre, additional, Cusa, Marine, additional, Cusset, Fanny, additional, Dadaglio, Laeticia, additional, Davelaar, Marty, additional, Deslongchamps, Gabrièle, additional, Dimier, Céline, additional, Dinasquet, Julie, additional, Dumont, Dany, additional, Else, Brent, additional, Eulaers, Igor, additional, Ferland, Joannie, additional, Filteau, Gabrielle, additional, Forget, Marie-Hélène, additional, Fort, Jérome, additional, Fortier, Louis, additional, Galí, Martí, additional, Gallinari, Morgane, additional, Garbus, Svend-Erik, additional, Garcia, Nicole, additional, Gérikas Ribeiro, Catherine, additional, Gombault, Colline, additional, Gourvil, Priscilla, additional, Goyens, Clémence, additional, Grant, Cindy, additional, Grondin, Pierre-Luc, additional, Guillot, Pascal, additional, Hillion, Sandrine, additional, Hussherr, Rachel, additional, Joux, Fabien, additional, Joy-Warren, Hannah, additional, Joyal, Gabriel, additional, Kieber, David, additional, Lafond, Augustin, additional, Lagunas, José, additional, Lajeunesse, Patrick, additional, Lalande, Catherine, additional, Larivière, Jade, additional, Le Gall, Florence, additional, Leblanc, Karine, additional, Leblanc, Mathieu, additional, Legras, Justine, additional, Lévesque, Keith, additional, Lewis, Kate-M., additional, Leymarie, Edouard, additional, Leynaert, Aude, additional, Linkowski, Thomas, additional, Lizotte, Martine, additional, Lopes dos Santos, Adriana, additional, Marec, Claudie, additional, Marie, Dominique, additional, Massé, Guillaume, additional, Massicotte, Philippe, additional, Matsuoka, Atsushi, additional, Miller, Lisa A., additional, Mirshak, Sharif, additional, Morata, Nathalie, additional, Moriceau, Brivaela, additional, Morin, Philippe-Israël, additional, Morisset, Simon, additional, Mosbech, Anders, additional, Mucci, Alfonso, additional, Nadaï, Gabrielle, additional, Nozais, Christian, additional, Obernosterer, Ingrid, additional, Paire, Thimoté, additional, Panagiotopoulos, Christos, additional, Parenteau, Marie, additional, Pelletier, Noémie, additional, Picheral, Marc, additional, Quéguiner, Bernard, additional, Raimbault, Patrick, additional, Ras, Joséphine, additional, Rehm, Eric, additional, Ribot Lacosta, Llúcia, additional, Rontani, Jean-François, additional, Saint-Béat, Blanche, additional, Sansoulet, Julie, additional, Sardet, Noé, additional, Schmechtig, Catherine, additional, Sciandra, Antoine, additional, Sempéré, Richard, additional, Sévigny, Caroline, additional, Toullec, Jordan, additional, Tragin, Margot, additional, Tremblay, Jean-Éric, additional, Trottier, Annie-Pier, additional, Vaulot, Daniel, additional, Vladoiu, Anda, additional, Xue, Lei, additional, Yunda-Guarin, Gustavo, additional, and Babin, Marcel, additional
Published: 2022
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13. Nudibranch predation boosts sponge silicon cycling

Author: López-Acosta, María, primary, Potel, Clémence, additional, Gallinari, Morgane, additional, Pérez, Fiz F., additional, and Leynaert, Aude, additional
Published: 2022
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14. The Green Edge cruise: investigating the marginal ice zone processes during late spring and early summer to understand the fate of the Arctic phytoplankton bloom

Author: Bruyant, Flavienne, Amiraux, Rémi, Amyot, Marie-pier, Archambault, Philippe, Artigue, Lise, Barbedo De Freitas, Lucas, Bécu, Guislain, Bélanger, Simon, Bourgain, Pascaline, Bricaud, Annick, Brouard, Etienne, Brunet, Camille, Burgers, Tonya, Caleb, Danielle, Chalut, Katrine, Claustre, Hervé, Cornet-barthaux, Véronique, Coupel, Pierre, Cusa, Marine, Cusset, Fanny, Dadaglio, Laeticia, Davelaar, Marty, Deslongchamps, Gabrièle, Dimier, Céline, Dinasquet, Julie, Dumont, Dany, Else, Brent, Eulaers, Igor, Ferland, Joannie, Filteau, Gabrielle, Forget, Marie-hélène, Fort, Jérome, Fortier, Louis, Galí, Martí, Gallinari, Morgane, Garbus, Svend-erik, Garcia, Nicole, Gérikas Ribeiro, Catherine, Gombault, Colline, Gourvil, Priscilla, Goyens, Clémence, Grant, Cindy, Grondin, Pierre-luc, Guillot, Pascal, Hillion, Sandrine, Hussherr, Rachel, Joux, Fabien, Joy-warren, Hannah, Joyal, Gabriel, Kieber, David, Lafond, Augustin, Lagunas, José, Lajeunesse, Patrick, Lalande, Catherine, Larivière, Jade, Le Gall, Florence, Leblanc, Karine, Leblanc, Mathieu, Legras, Justine, Lévesque, Keith, Lewis, Kate-m., Leymarie, Edouard, Leynaert, Aude, Linkowski, Thomas, Lizotte, Martine, Lopes Dos Santos, Adriana, Marec, Claudie, Marie, Dominique, Massé, Guillaume, Massicotte, Philippe, Matsuoka, Atsushi, Miller, Lisa A., Mirshak, Sharif, Morata, Nathalie, Moriceau, Brivaela, Morin, Philippe-israël, Morisset, Simon, Mosbech, Anders, Mucci, Alfonso, Nadaï, Gabrielle, Nozais, Christian, Obernosterer, Ingrid, Paire, Thimoté, Panagiotopoulos, Christos, Parenteau, Marie, Pelletier, Noémie, Picheral, Marc, Quéguiner, Bernard, Raimbault, Patrick, Ras, Joséphine, Rehm, Eric, Ribot Lacosta, Llúcia, Rontani, Jean-françois, Saint Beat, Blanche, Sansoulet, Julie, Sardet, Noé, Schmechtig, Catherine, Sciandra, Antoine, Sempéré, Richard, Sévigny, Caroline, Toullec, Jordan, Tragin, Margot, Tremblay, Jean-éric, Trottier, Annie-pier, Vaulot, Daniel, Vladoiu, Anda, Xue, Lei, Yunda-guarin, Gustavo, Babin, Marcel, Bruyant, Flavienne, Amiraux, Rémi, Amyot, Marie-pier, Archambault, Philippe, Artigue, Lise, Barbedo De Freitas, Lucas, Bécu, Guislain, Bélanger, Simon, Bourgain, Pascaline, Bricaud, Annick, Brouard, Etienne, Brunet, Camille, Burgers, Tonya, Caleb, Danielle, Chalut, Katrine, Claustre, Hervé, Cornet-barthaux, Véronique, Coupel, Pierre, Cusa, Marine, Cusset, Fanny, Dadaglio, Laeticia, Davelaar, Marty, Deslongchamps, Gabrièle, Dimier, Céline, Dinasquet, Julie, Dumont, Dany, Else, Brent, Eulaers, Igor, Ferland, Joannie, Filteau, Gabrielle, Forget, Marie-hélène, Fort, Jérome, Fortier, Louis, Galí, Martí, Gallinari, Morgane, Garbus, Svend-erik, Garcia, Nicole, Gérikas Ribeiro, Catherine, Gombault, Colline, Gourvil, Priscilla, Goyens, Clémence, Grant, Cindy, Grondin, Pierre-luc, Guillot, Pascal, Hillion, Sandrine, Hussherr, Rachel, Joux, Fabien, Joy-warren, Hannah, Joyal, Gabriel, Kieber, David, Lafond, Augustin, Lagunas, José, Lajeunesse, Patrick, Lalande, Catherine, Larivière, Jade, Le Gall, Florence, Leblanc, Karine, Leblanc, Mathieu, Legras, Justine, Lévesque, Keith, Lewis, Kate-m., Leymarie, Edouard, Leynaert, Aude, Linkowski, Thomas, Lizotte, Martine, Lopes Dos Santos, Adriana, Marec, Claudie, Marie, Dominique, Massé, Guillaume, Massicotte, Philippe, Matsuoka, Atsushi, Miller, Lisa A., Mirshak, Sharif, Morata, Nathalie, Moriceau, Brivaela, Morin, Philippe-israël, Morisset, Simon, Mosbech, Anders, Mucci, Alfonso, Nadaï, Gabrielle, Nozais, Christian, Obernosterer, Ingrid, Paire, Thimoté, Panagiotopoulos, Christos, Parenteau, Marie, Pelletier, Noémie, Picheral, Marc, Quéguiner, Bernard, Raimbault, Patrick, Ras, Joséphine, Rehm, Eric, Ribot Lacosta, Llúcia, Rontani, Jean-françois, Saint Beat, Blanche, Sansoulet, Julie, Sardet, Noé, Schmechtig, Catherine, Sciandra, Antoine, Sempéré, Richard, Sévigny, Caroline, Toullec, Jordan, Tragin, Margot, Tremblay, Jean-éric, Trottier, Annie-pier, Vaulot, Daniel, Vladoiu, Anda, Xue, Lei, Yunda-guarin, Gustavo, and Babin, Marcel
Abstract: The Green Edge project was designed to investigate the onset, life, and fate of a phytoplankton spring bloom (PSB) in the Arctic Ocean. The lengthening of the ice-free period and the warming of seawater, amongst other factors, have induced major changes in Arctic Ocean biology over the last decades. Because the PSB is at the base of the Arctic Ocean food chain, it is crucial to understand how changes in the Arctic environment will affect it. Green Edge was a large multidisciplinary, collaborative project bringing researchers and technicians from 28 different institutions in seven countries together, aiming at understanding these changes and their impacts on the future. The fieldwork for the Green Edge project took place over two years (2015 and 2016) and was carried out from both an ice camp and a research vessel in Baffin Bay, in the Canadian Arctic. This paper describes the sampling strategy and the dataset obtained from the research cruise, which took place aboard the Canadian Coast Guard ship (CCGS) Amundsen in late spring and early summer 2016. The sampling strategy was designed around the repetitive, perpendicular crossing of the marginal ice zone (MIZ), using not only ship-based station discrete sampling but also high-resolution measurements from autonomous platforms (Gliders, BGC-Argo floats …) and under-way monitoring systems. The dataset is available at https://doi.org/10.17882/86417 (Bruyant et al., 2022).
Published: 2022
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15. The Green Edge cruise: Understanding the onset, life and fate of the Arctic phytoplankton spring bloom

Author: Bruyant, Flavienne, primary, Amiraux, Rémi, additional, Amyot, Marie-Pier, additional, Archambault, Philippe, additional, Artigue, Lise, additional, Bardedo de Freitas, Lucas, additional, Bécu, Guislain, additional, Bélanger, Simon, additional, Bourgain, Pascaline, additional, Bricaud, Annick, additional, Brouard, Etienne, additional, Brunet, Camille, additional, Burgers, Tonya, additional, Caleb, Danielle, additional, Chalut, Katrine, additional, Clautre, Hervé, additional, Cornet-Barthaux, Véronique, additional, Coupel, Pierre, additional, Cusa, Marine, additional, Cusset, Fanny, additional, Dadaglio, Laeticia, additional, Davelaar, Marty, additional, Deslongchamps, Gabriele, additional, Dimier, Céline, additional, Dinasquet, Julie, additional, Dumont, Dany, additional, Else, Brent, additional, Eulaers, Igor, additional, Ferland, Joannie, additional, Filteau, Gabrielle, additional, Forget, Marie-Hélène, additional, Fort, Jérome, additional, Fortier, Louis, additional, Galí-Tapías, Martí, additional, Gallinari, Morgane, additional, Garbus, Svend-Erik, additional, Garcia, Nicole, additional, Gérikas Ribeiro, Catherine, additional, Gombault, Colline, additional, Gourvil, Priscilla, additional, Goyens, Clémence, additional, Grant, Cindy, additional, Grondin, Pierre-Luc, additional, Guillot, Pascal, additional, Hillion, Sandrine, additional, Hussher, Rachel, additional, Joux, Fabien, additional, Joy-Warren, Hannah, additional, Joyal, Gabriel, additional, Kieber, David, additional, Lafond, Augustin, additional, Lagunas, José, additional, Lajeunesse, Patrick, additional, Lalande, Catherine, additional, Larivière, Jade, additional, Le Gall, Florence, additional, Leblanc, Karine, additional, Leblanc, Mathieu, additional, Legras, Justine, additional, Levesque, Keith, additional, Lewis, Kate-Marie, additional, Leymarie, Edouard, additional, Leynaert, Aude, additional, Linkowski, Thomas, additional, Lizotte, Martine, additional, Lopes dos Santos, Adriana, additional, Marec, Claudie, additional, Marie, Dominique, additional, Massé, Guillaume, additional, Massicotte, Philippe, additional, Matsuoka, Atsushi, additional, Miller, Lisa, additional, Mirshak, Sharif, additional, Morata, Nathalie, additional, Moriceau, Brivaela, additional, Morin, Philippe-Israël, additional, Morisset, Simon, additional, Mosbech, Anders, additional, Mucci, Alfonso, additional, Nadaï, Gabrielle, additional, Nozais, Christian, additional, Obernosterer, Ingrid, additional, Paire, Timothe, additional, Panagiotopoulos, Christos, additional, Parenteau, Marie, additional, Pelletier, Noémie, additional, Picheral, Marc, additional, Quéguiner, Bernard, additional, Raimbault, Patrick, additional, Ras, Joséphine, additional, Rehm, Eric, additional, Ribot Lacosta, Llúcia, additional, Rontani, Jean-François, additional, Saint-Béat, Blanche, additional, Sansoulet, Julie, additional, Sardet, Noé, additional, Schmechtig, Catherine, additional, Sciandra, Antoine, additional, Sempéré, Richard, additional, Sévigny, Caroline, additional, Toullec, Jordan, additional, Tragin, Margot, additional, Tremblay, Jean-Eric, additional, Trottier, Annie-Pier, additional, Vaulot, Daniel, additional, Vladoiu, Anda, additional, Xue, Lei, additional, Yunda-Guarin, Gustavo, additional, and Babin, Marcel, additional
Published: 2022
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16. Role of small Rhizaria and diatoms in the pelagic silica production of the Southern Ocean

Author: Llopis Monferrer, Natalia, primary, Leynaert, Aude, additional, Tréguer, Paul, additional, Gutiérrez‐Rodríguez, Andrés, additional, Moriceau, Brivaela, additional, Gallinari, Morgane, additional, Latasa, Mikel, additional, L'Helguen, Stéphane, additional, Maguer, Jean‐François, additional, Safi, Karl, additional, Pinkerton, Matthew H., additional, and Not, Fabrice, additional
Published: 2021
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17. Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01)

Author: Tonnard, Manon, Planquette, Hélène, Bowie, Andrew R., Van Der Merwe, Pier, Gallinari, Morgane, Desprez De Gésincourt, Floriane, Germain, Yoan, Gourain, Arthur, Benetti, Marion, Reverdin, Gilles, Tréguer, Paul, Boutorh, Julia, Cheize, Marie, Menzel Barraqueta, Jan-lukas, Pereira-contreira, Leonardo, Shelley, Rachel, Lherminier, Pascale, Sarthou, Géraldine, Tonnard, Manon, Planquette, Hélène, Bowie, Andrew R., Van Der Merwe, Pier, Gallinari, Morgane, Desprez De Gésincourt, Floriane, Germain, Yoan, Gourain, Arthur, Benetti, Marion, Reverdin, Gilles, Tréguer, Paul, Boutorh, Julia, Cheize, Marie, Menzel Barraqueta, Jan-lukas, Pereira-contreira, Leonardo, Shelley, Rachel, Lherminier, Pascale, and Sarthou, Géraldine
Abstract: Dissolved Fe (DFe) samples from the GEOVIDE voyage (GEOTRACES GA01, May–June 2014) in the North Atlantic Ocean were analysed using a SeaFAST-picoTM coupled to an Element XR HR-ICP-MS and provided interesting insights on the Fe sources in this area. Overall, DFe concentrations ranged from 0.09 ± 0.01 nmol L−1 to 7.8 ± 0.5 nmol L−1. Elevated DFe concentrations were observed above the Iberian, Greenland and Newfoundland Margins likely due to riverine inputs from the Tagus River, meteoric water inputs and sedimentary inputs. Air-sea interactions were suspected to be responsible for the increase in DFe concentrations within subsurface waters of the Irminger Sea due to deep convection occurring the previous winter, that provided iron-to-nitrate ratios sufficient to sustain phytoplankton growth. Increasing DFe concentrations along the flow path of the Labrador Sea Water were attributed to sedimentary inputs from the Newfoundland Margin. Bottom waters from the Irminger Sea displayed high DFe concentrations likely due to the dissolution of Fe-rich particles from the Denmark Strait Overflow Water and the Polar Intermediate Water. Finally, the nepheloid layers were found to act as either a source or a sink of DFe depending on the nature of particles.
Published: 2020
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18. Green Edge ice camp campaigns: understanding the processes controlling the under-ice Arctic phytoplankton spring bloom

Author: Massicotte, Philippe, Amiraux, Rémi, Amyot, Marie-pier, Archambault, Philippe, Ardyna, Mathieu, Arnaud, Laurent, Artigue, Lise, Aubry, Cyril, Ayotte, Pierre, Bécu, Guislain, Bélanger, Simon, Benner, Ronald, Bittig, Henry C, Bricaud, Annick, Brossier, Eric, Bruyant, Flavienne, Chauvaud, Laurent, Christiansen-stowe, Debra, Claustre, Hervé, Cornet-barthaux, Véronique, Coupel, Pierre, Cox, Christine, Delaforge, Aurélie, Dezutter, Thibault, Dimier, Céline, Dominé, Florent, Dufour, Francis, Dufresne, Christiane, Dumont, Dany, Ehn, Jens, Else, Brent, Ferland, Joannie, Forget, Marie-hélène, Fortier, Louis, Gali, Marti, Galindo, Virginie, Gallinari, Morgane, Garcia, Nicole, Gerikas-ribeiro, Catherine, Gourdal, Margaux, Gourvil, Priscilla, Goyens, Clemence, Grondin, Pierre-luc, Guillot, Pascal, Guilmette, Caroline, Houssais, Marie-noëlle, Joux, Fabien, Lacour, Léo, Lacour, Thomas, Lafond, Augustin, Lagunas, José, Lalande, Catherine, Laliberté, Julien, Lambert-girard, Simon, Larivière, Jade, Lavaud, Johann, Lebaron, Anita, Leblanc, Karine, Le Gall, Florence, Legras, Justine, Lemire, Mélanie, Levasseur, Maurice, Leymarie, Edouard, Leynaert, Aude, Lopes Dos Santos, Adriana, Lourenço, Antonio, Mah, David, Marec, Claudie, Marie, Dominique, Martin, Nicolas, Marty, Constance, Marty, Sabine, Massé, Guillaume, Matsuoka, Atsushi, Matthes, Lisa, Moriceau, Brivaela, Muller, Pierre-emmanuel, Mundy, Christopher-john, Neukermans, Griet, Oziel, Laurent, Panagiotopoulos, Christos, Pangazi, Jean-jacques, Picard, Ghislain, Picheral, Marc, Pinczon Du Sel, France, Pogorzelec, Nicole, Probert, Ian, Queguiner, Bernard, Raimbault, Patrick, Ras, Joséphine, Rehm, Eric, Reimer, Erin, Rontani, Jean-françois, Rysgaard, Soren, Saint-béat, Blanche, Sampei, Makoto, Sansoulet, Julie, Schmidt, Sabine, Sempere, Richard, Sevigny, Caroline, Shen, Yuan, Tragin, Margot, Tremblay, Jean-eric, Vaulot, Daniel, Verin, Gauthier, Vivier, Frédéric, Vladoiu, Anda, Whitehead, Jeremy, Babin, Marcel, Massicotte, Philippe, Amiraux, Rémi, Amyot, Marie-pier, Archambault, Philippe, Ardyna, Mathieu, Arnaud, Laurent, Artigue, Lise, Aubry, Cyril, Ayotte, Pierre, Bécu, Guislain, Bélanger, Simon, Benner, Ronald, Bittig, Henry C, Bricaud, Annick, Brossier, Eric, Bruyant, Flavienne, Chauvaud, Laurent, Christiansen-stowe, Debra, Claustre, Hervé, Cornet-barthaux, Véronique, Coupel, Pierre, Cox, Christine, Delaforge, Aurélie, Dezutter, Thibault, Dimier, Céline, Dominé, Florent, Dufour, Francis, Dufresne, Christiane, Dumont, Dany, Ehn, Jens, Else, Brent, Ferland, Joannie, Forget, Marie-hélène, Fortier, Louis, Gali, Marti, Galindo, Virginie, Gallinari, Morgane, Garcia, Nicole, Gerikas-ribeiro, Catherine, Gourdal, Margaux, Gourvil, Priscilla, Goyens, Clemence, Grondin, Pierre-luc, Guillot, Pascal, Guilmette, Caroline, Houssais, Marie-noëlle, Joux, Fabien, Lacour, Léo, Lacour, Thomas, Lafond, Augustin, Lagunas, José, Lalande, Catherine, Laliberté, Julien, Lambert-girard, Simon, Larivière, Jade, Lavaud, Johann, Lebaron, Anita, Leblanc, Karine, Le Gall, Florence, Legras, Justine, Lemire, Mélanie, Levasseur, Maurice, Leymarie, Edouard, Leynaert, Aude, Lopes Dos Santos, Adriana, Lourenço, Antonio, Mah, David, Marec, Claudie, Marie, Dominique, Martin, Nicolas, Marty, Constance, Marty, Sabine, Massé, Guillaume, Matsuoka, Atsushi, Matthes, Lisa, Moriceau, Brivaela, Muller, Pierre-emmanuel, Mundy, Christopher-john, Neukermans, Griet, Oziel, Laurent, Panagiotopoulos, Christos, Pangazi, Jean-jacques, Picard, Ghislain, Picheral, Marc, Pinczon Du Sel, France, Pogorzelec, Nicole, Probert, Ian, Queguiner, Bernard, Raimbault, Patrick, Ras, Joséphine, Rehm, Eric, Reimer, Erin, Rontani, Jean-françois, Rysgaard, Soren, Saint-béat, Blanche, Sampei, Makoto, Sansoulet, Julie, Schmidt, Sabine, Sempere, Richard, Sevigny, Caroline, Shen, Yuan, Tragin, Margot, Tremblay, Jean-eric, Vaulot, Daniel, Verin, Gauthier, Vivier, Frédéric, Vladoiu, Anda, Whitehead, Jeremy, and Babin, Marcel
Abstract: The Green Edge initiative was developed to investigate the processes controlling the primary productivity and the fate of organic matter produced during the Arctic phytoplankton spring bloom (PSB) and to determine its role in the ecosystem. Two field campaigns were conducted in 2015 and 2016 at an ice camp located on landfast sea ice southeast of Qikiqtarjuaq Island in Baffin Bay (67.4797N, 63.7895W). During both expeditions, a large suite of physical, chemical and biological variables was measured beneath a consolidated sea ice cover from the surface to the bottom at 360 m depth to better understand the factors driving the PSB. Key variables such as temperature, salinity, radiance, irradiance, nutrient concentrations, chlorophyll-a concentration, bacteria, phytoplankton and zooplankton abundance and taxonomy, carbon stocks and fluxes were routinely measured at the ice camp. Here, we present the results of a joint effort to tidy and standardize the collected data sets that will facilitate their reuse in other Arctic studies. The dataset is available at http://www.seanoe.org/data/00487/59892/ (Massicotte et al., 2019a).
Published: 2020
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19. Element enrichment and provenance of the detrital component in Holocene sediments from the western Black Sea

Author: Dekov, Vesselin M., Darakchieva, Valentina Y., Billström, Kjell, Garbe-schönberg, C-dieter, Kamenov, George D., Gallinari, Morgane, Dimitrov, Lyubo, Ragueneau, Olivier, Kooijman, Ellen, Dekov, Vesselin M., Darakchieva, Valentina Y., Billström, Kjell, Garbe-schönberg, C-dieter, Kamenov, George D., Gallinari, Morgane, Dimitrov, Lyubo, Ragueneau, Olivier, and Kooijman, Ellen
Abstract: Concentrations of a large set of major and trace elements, and Sr, Nd and Pb isotope ratios were measured in Holocene sediments cored in the western deep Black Sea in order to unravel: (1) the controls of element enrichment, and (2) sources of the detrital component. The transition of the basin from oxic to euxinic resulted in enrichment or depletion in a number of elements in the deep-sea sediments. Authigenic Fe enrichment appears to depend on the amount of Fe mobilized from the sediment through the benthic redox shuttle mechanism and free H2S in the water column (degree of “euxinization”). Manganese enrichment is controlled by diagenetic reactions within the sediment: the dissolution of Mn minerals, Mn2+ diffusion upward and reprecipitation. Barium enrichment is also controlled by diagenetic reactions, sulfate reduction and methanogenesis, that take place above and below the sulfate-methane transition, respectively. The major part of V, Co, Ni, Cu, Zn, Cr, Mo, Cd and Sb is inferred to have co-precipitated with Fe in the euxinic deep waters and to have been incorporated into authigenic Fe-sulfides. Basin reservoir effect additionally influences the Mo enrichment. The U enrichment is interpreted to have a different origin in the two organic-rich stratigraphic units (II and I). It is inferred to be: (i) at the expense of the U inventory of the deepwater pool and a result of inorganic reduction of U at euxinic conditions in the lower Unit II; and (ii) at the expense of the U inventory of the surface water pool and a result of biogenic uptake and transfer to the sediment by the plankton in the upper Unit I. The high field strength elements are closely linked to the detrital component and their depletion in the organic-rich sediments reflects a dilution of the detrital component by the biogenic one. The enrichments of REE, Sn and Th are likely controlled by adsorption on clay minerals. Sr-Nd-Pb isotope compositions of the alumino-silicate component of the studied sedim
Published: 2020
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20. New guidelines for the application of Stokes' models to the sinking velocity of marine aggregates

Author: Laurenceau‐Cornec, Emmanuel C., Le Moigne, Frédéric A. C., Gallinari, Morgane, Moriceau, Brivaëla, Toullec, Jordan, Iversen, Morten H., Engel, Anja, De La Rocha, Christina L., Laurenceau‐Cornec, Emmanuel C., Le Moigne, Frédéric A. C., Gallinari, Morgane, Moriceau, Brivaëla, Toullec, Jordan, Iversen, Morten H., Engel, Anja, and De La Rocha, Christina L.
Abstract: Numerical simulations of ocean biogeochemical cycles need to adequately represent particle sinking velocities (SV). For decades, Stokes' Law estimating particle SV from density and size has been widely used. But while Stokes' Law holds for small, smooth, and rigid spheres settling at low Reynolds number, it fails when applied to marine aggregates complex in shape, structure, and composition. Minerals and zooplankton can alter phytoplankton aggregates in ways that change their SV, potentially improving the applicability of Stokes' models. Using rolling cylinders, we experimentally produced diatom aggregates in the presence and absence of minerals and/or microzooplankton. Minerals and to a lesser extent microzooplankton decreased aggregate size and roughness and increased their sphericity and compactness. Stokes' Law parameterized with a fractal porosity modeled adequately size‐SV relationships for mineral‐loaded aggregates. Phytoplankton‐only aggregates and those exposed to microzooplankton followed the general Navier‐Stokes drag equation suggesting an indiscernible effect of microzooplankton and a drag coefficient too complex to be calculated with a Stokes' assumption. We compared our results with a larger data set of ballasted and nonballasted marine aggregates. This confirmed that the size‐SV relationships for ballasted aggregates can be simulated by Stokes' models with an adequate fractal porosity parameterization. Given the importance of mineral ballasting in the ocean, our findings could ease biogeochemical model parameterization for a significant pool of particles in the ocean and especially in the mesopelagic zone where the particulate organic matter : mineral ratio decreases. Our results also reinforce the importance of accounting for porosity as a decisive predictor of marine aggregate SV.
Published: 2020

21. Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Author: Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences, Sarthou, Géraldine, Lherminier, Pascale, Achterberg, Eric P., Alonso-Pérez, Fernando, Bucciarelli, Eva, Boutorh, Julia, Bouvier, Vincent, Boyle, Edward A, Branellec, Pierre, Carracedo, Lidia I., Casacuberta, Nuria, Castrillejo, Maxi, Cheize, Marie, Contreira Pereira, Leonardo, Cossa, Daniel, Daniault, Nathalie, De Saint-Léger, Emmanuel, Dehairs, Frank, Deng, Feifei, Desprez de Gésincourt, Floriane, Devesa, Jérémy, Foliot, Lorna, Fonseca-Batista, Debany, Gallinari, Morgane, García-Ibáñez, Maribel I., Gourain, Arthur, Grossteffan, Emilie, Hamon, Michel, Heimbürger, Lars Eric, Henderson, Gideon M., Jeandel, Catherine, Kermabon, Catherine, Lacan, François, Le Bot, Philippe, Le Goff, Manon, Le Roy, Emilie, Lefèbvre, Alison, Leizour, Stéphane, Lemaitre, Nolwenn, Masqué, Pere, Ménage, Olivier, Menzel Barraqueta, Jan-Lukas, Mercier, Herlé, Perault, Fabien, Pérez, Fiz F., Planquette, Hélène F., Planchon, Frédéric, Roukaerts, Arnout, Sanial, Virginie, Sauzède, Raphaëlle, Schmechtig, Catherine, Shelley, Rachel U., Stewart, Gillian, Sutton, Jill N., Tang, Yi, Tisnérat-Laborde, Nadine, Tonnard, Manon, Tréguer, Paul, van Beek, Pieter, Zurbrick, Cheryl M, Zunino, Patricia, Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences, Sarthou, Géraldine, Lherminier, Pascale, Achterberg, Eric P., Alonso-Pérez, Fernando, Bucciarelli, Eva, Boutorh, Julia, Bouvier, Vincent, Boyle, Edward A, Branellec, Pierre, Carracedo, Lidia I., Casacuberta, Nuria, Castrillejo, Maxi, Cheize, Marie, Contreira Pereira, Leonardo, Cossa, Daniel, Daniault, Nathalie, De Saint-Léger, Emmanuel, Dehairs, Frank, Deng, Feifei, Desprez de Gésincourt, Floriane, Devesa, Jérémy, Foliot, Lorna, Fonseca-Batista, Debany, Gallinari, Morgane, García-Ibáñez, Maribel I., Gourain, Arthur, Grossteffan, Emilie, Hamon, Michel, Heimbürger, Lars Eric, Henderson, Gideon M., Jeandel, Catherine, Kermabon, Catherine, Lacan, François, Le Bot, Philippe, Le Goff, Manon, Le Roy, Emilie, Lefèbvre, Alison, Leizour, Stéphane, Lemaitre, Nolwenn, Masqué, Pere, Ménage, Olivier, Menzel Barraqueta, Jan-Lukas, Mercier, Herlé, Perault, Fabien, Pérez, Fiz F., Planquette, Hélène F., Planchon, Frédéric, Roukaerts, Arnout, Sanial, Virginie, Sauzède, Raphaëlle, Schmechtig, Catherine, Shelley, Rachel U., Stewart, Gillian, Sutton, Jill N., Tang, Yi, Tisnérat-Laborde, Nadine, Tonnard, Manon, Tréguer, Paul, van Beek, Pieter, Zurbrick, Cheryl M, and Zunino, Patricia
Abstract: The GEOVIDE cruise, a collaborative project within the framework of the international GEOTRACES programme, was conducted along the French-led section in the North Atlantic Ocean (Section GA01), between 15 May and 30 June 2014. In this special issue (https://www.biogeosciences.net/special-issue900.html), results from GEOVIDE, including physical oceanography and trace element and isotope cyclings, are presented among 18 articles. Here, the scientific context, project objectives, and scientific strategy of GEOVIDE are provided, along with an overview of the main results from the articles published in the special issue.
Published: 2020

22. Particulate Trace Element Export in the North Atlantic (GEOTRACES GA01 Transect, GEOVIDE Cruise)

Author: Lemaitre, Nolwenn, primary, Planquette, Hélène, additional, Dehairs, Frank, additional, Planchon, Frédéric, additional, Sarthou, Géraldine, additional, Gallinari, Morgane, additional, Roig, Stéphane, additional, Jeandel, Catherine, additional, and Castrillejo, Maxi, additional
Published: 2020
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23. Element enrichment and provenance of the detrital component in Holocene sediments from the western Black Sea

Author: Dekov, Vesselin M., primary, Darakchieva, Valentina Y., additional, Billström, Kjell, additional, Garbe-Schönberg, C. Dieter, additional, Kamenov, George D., additional, Gallinari, Morgane, additional, Dimitrov, Lyubomir, additional, Ragueneau, Olivier, additional, and Kooijman, Ellen, additional
Published: 2020
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24. Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01)

Author: Tonnard, Manon, primary, Planquette, Hélène, additional, Bowie, Andrew R., additional, van der Merwe, Pier, additional, Gallinari, Morgane, additional, Desprez de Gésincourt, Floriane, additional, Germain, Yoan, additional, Gourain, Arthur, additional, Benetti, Marion, additional, Reverdin, Gilles, additional, Tréguer, Paul, additional, Boutorh, Julia, additional, Cheize, Marie, additional, Lacan, François, additional, Menzel Barraqueta, Jan-Lukas, additional, Pereira-Contreira, Leonardo, additional, Shelley, Rachel, additional, Lherminier, Pascale, additional, and Sarthou, Géraldine, additional
Published: 2020
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25. Green Edge ice camp campaigns: understanding the processes controlling the under-ice Arctic phytoplankton spring bloom

Author: Massicotte, Philippe, primary, Amiraux, Rémi, additional, Amyot, Marie-Pier, additional, Archambault, Philippe, additional, Ardyna, Mathieu, additional, Arnaud, Laurent, additional, Artigue, Lise, additional, Aubry, Cyril, additional, Ayotte, Pierre, additional, Bécu, Guislain, additional, Bélanger, Simon, additional, Benner, Ronald, additional, Bittig, Henry C., additional, Bricaud, Annick, additional, Brossier, Éric, additional, Bruyant, Flavienne, additional, Chauvaud, Laurent, additional, Christiansen-Stowe, Debra, additional, Claustre, Hervé, additional, Cornet-Barthaux, Véronique, additional, Coupel, Pierre, additional, Cox, Christine, additional, Delaforge, Aurelie, additional, Dezutter, Thibaud, additional, Dimier, Céline, additional, Domine, Florent, additional, Dufour, Francis, additional, Dufresne, Christiane, additional, Dumont, Dany, additional, Ehn, Jens, additional, Else, Brent, additional, Ferland, Joannie, additional, Forget, Marie-Hélène, additional, Fortier, Louis, additional, Galí, Martí, additional, Galindo, Virginie, additional, Gallinari, Morgane, additional, Garcia, Nicole, additional, Gérikas Ribeiro, Catherine, additional, Gourdal, Margaux, additional, Gourvil, Priscilla, additional, Goyens, Clemence, additional, Grondin, Pierre-Luc, additional, Guillot, Pascal, additional, Guilmette, Caroline, additional, Houssais, Marie-Noëlle, additional, Joux, Fabien, additional, Lacour, Léo, additional, Lacour, Thomas, additional, Lafond, Augustin, additional, Lagunas, José, additional, Lalande, Catherine, additional, Laliberté, Julien, additional, Lambert-Girard, Simon, additional, Larivière, Jade, additional, Lavaud, Johann, additional, LeBaron, Anita, additional, Leblanc, Karine, additional, Le Gall, Florence, additional, Legras, Justine, additional, Lemire, Mélanie, additional, Levasseur, Maurice, additional, Leymarie, Edouard, additional, Leynaert, Aude, additional, Lopes dos Santos, Adriana, additional, Lourenço, Antonio, additional, Mah, David, additional, Marec, Claudie, additional, Marie, Dominique, additional, Martin, Nicolas, additional, Marty, Constance, additional, Marty, Sabine, additional, Massé, Guillaume, additional, Matsuoka, Atsushi, additional, Matthes, Lisa, additional, Moriceau, Brivaela, additional, Muller, Pierre-Emmanuel, additional, Mundy, Christopher-John, additional, Neukermans, Griet, additional, Oziel, Laurent, additional, Panagiotopoulos, Christos, additional, Pangrazi, Jean-Jacques, additional, Picard, Ghislain, additional, Picheral, Marc, additional, Pinczon du Sel, France, additional, Pogorzelec, Nicole, additional, Probert, Ian, additional, Quéguiner, Bernard, additional, Raimbault, Patrick, additional, Ras, Joséphine, additional, Rehm, Eric, additional, Reimer, Erin, additional, Rontani, Jean-François, additional, Rysgaard, Søren, additional, Saint-Béat, Blanche, additional, Sampei, Makoto, additional, Sansoulet, Julie, additional, Schmechtig, Catherine, additional, Schmidt, Sabine, additional, Sempéré, Richard, additional, Sévigny, Caroline, additional, Shen, Yuan, additional, Tragin, Margot, additional, Tremblay, Jean-Éric, additional, Vaulot, Daniel, additional, Verin, Gauthier, additional, Vivier, Frédéric, additional, Vladoiu, Anda, additional, Whitehead, Jeremy, additional, and Babin, Marcel, additional
Published: 2020
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26. New guidelines for the application of Stokes' models to the sinking velocity of marine aggregates

Author: Laurenceau‐Cornec, Emmanuel C., primary, Le Moigne, Frédéric A. C., additional, Gallinari, Morgane, additional, Moriceau, Brivaëla, additional, Toullec, Jordan, additional, Iversen, Morten H., additional, Engel, Anja, additional, and De La Rocha, Christina L., additional
Published: 2019
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27. Evidence of high N2 fixation rates in the temperate northeast Atlantic

Author: Fonseca-Batista, Debany, Li, Xuefeng, Riou, Virginie, Michotey, Valerie, Deman, Florian, Fripiat, François, Guasco, Sophie, Brion, Natacha, Lemaitre, Nolwenn, Tonnard, Manon, Gallinari, Morgane, Planquette, Hélène, Planchon, Frédéric, Sarthou, Géraldine, Elskens, Marc, Laroche, Julie, Chou, Lei, Dehairs, Frank, Vrije Universiteit [Brussels] (VUB), Key Laboratory of Bio-resources and Eco-environment, ministry of education-College of Life Sciences-Sichuan University, Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de MicrobiologiE de Géochimie et d'Ecologie Marines (LMGEM), Université de la Méditerranée - Aix-Marseille 2-Centre National de la Recherche Scientifique (CNRS), Analytical, Environmental and Geo- Chemistry, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de glaciologie et géophysique de l'environnement (LGGE), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS), Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR), Analytical and Environmental Chemistry and Earth System Sciences, ANR-13-BS06-0014,GEOVIDE,GEOVIDE, Une étude internationale GEOTRACES le long de la section OVIDE en Atlantique Nord et en Mer du Labrador(2013), ANR: 11-LABX-0061,Labex OT- Med,ANR-11-LABEX-0061, ANR-11-IDEX-0001-02/11-IDEX-0001,AMIDEX,AMIDEX(2011), Vrije Universiteit Brussel (VUB), Dalhousie University [Halifax], Université libre de Bruxelles (ULB), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Max Planck Institute for Chemistry (MPIC), Max-Planck-Gesellschaft, Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institute of Geochemistry and Petrology [ETH Zürich], Department of Earth Sciences [Swiss Federal Institute of Technology - ETH Zürich] (D-ERDW), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Institute for Marine and Antarctic Studies [Hobart] (IMAS), University of Tasmania [Hobart, Australia] (UTAS), ANR-11-LABX-0061,OTMed,Objectif Terre : Bassin Méditerranéen(2011), ANR-11-IDEX-0001,Amidex,INITIATIVE D'EXCELLENCE AIX MARSEILLE UNIVERSITE(2011), Centre National de la Recherche Scientifique (CNRS)-Université de la Méditerranée - Aix-Marseille 2, Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Institute for Marine and Antarctic Studies [Horbat] (IMAS)
Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Ecologie, Géologie et minéralogie, IRON, ACL, [SDE.MCG]Environmental Sciences/Global Changes, ENVIRONMENTAL CONTROLS, Evolution des espèces, VARIABILITY, NIFH GENES, DIAZOTROPHIC CYANOBACTERIA, TRICHODESMIUM, [SDE]Environmental Sciences, DINITROGEN-FIXATION, DISTRIBUTIONS, NITROGEN-FIXATION, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, MARINE
Abstract: Diazotrophic activity and primary production (PP) were investigated along two transects (Belgica BG2014/14 and GEOVIDE cruises) off the western Iberian Margin and the Bay of Biscay in May 2014. Substantial N 2 fixation activity was observed at 8 of the 10 stations sampled, ranging overall from 81 to 384 μmolNm -2 d -1 (0.7 to 8.2 nmolNL -1 d -1 ,with two sites close to the Iberian Margin situated between 38.8 and 40.7° N yielding rates reaching up to 1355 and 1533 μmolNm -2 d -1 .Primary production was relatively lower along the Iberian Margin, with rates ranging from 33 to 59 mmol Cm -2 d -1 ,while it increased towards the northwest away from the peninsula, reaching as high as 135 mmol Cm -2 d -1 .In agreement with the area-averaged Chl a satellite data contemporaneous with our study period, our results revealed that post-bloom conditions prevailed at most sites, while at the northwesternmost station the bloom was still ongoing. When converted to carbon uptake using Redfield stoichiometry, N 2 fixation could support 1% to 3% of daily PP in the euphotic layer at most sites, except at the two most active sites where this contribution to daily PP could reach up to 25 %. At the two sites where N 2 fixation activity was the highest, the prymnesiophyte.symbiont Candidatus Atelocyanobacterium thalassa (UCYN-A) dominated the nifH sequence pool, while the remaining recovered sequences belonged to non-cyanobacterial phylotypes. At all the other sites, however, the recovered nifH sequences were exclusively assigned phylogenetically to non-cyanobacterial phylotypes. The intense N 2 fixation activities recorded at the time of our study were likely promoted by the availability of phytoplanktonderived organic matter produced during the spring bloom, as evidenced by the significant surface particulate organic carbon concentrations. Also, the presence of excess phosphorus signature in surface waters seemed to contribute to sustaining N 2 fixation, particularly at the sites with extreme activities. These results provide a mechanistic understanding of the unexpectedly high N 2 fixation in productive waters of the temperate North Atlantic and highlight the importance of N 2 fixation for future assessment of the global N inventory., SCOPUS: ar.j, info:eu-repo/semantics/published
Published: 2019

28. Revisiting the distribution of oceanic N-2 fixation and estimating diazotrophic contribution to marine production

Author: Tang, Weiyi, Wang, Seaver, Fonseca-batista, Debany, Dehairs, Frank, Gifford, Scott, Gonzalez, Aridane G., Gallinari, Morgane, Planquette, Helene, Sarthou, Geraldine, Cassar, Nicolas, Tang, Weiyi, Wang, Seaver, Fonseca-batista, Debany, Dehairs, Frank, Gifford, Scott, Gonzalez, Aridane G., Gallinari, Morgane, Planquette, Helene, Sarthou, Geraldine, and Cassar, Nicolas
Abstract: Marine N-2 fixation supports a significant portion of oceanic primary production by making N-2 bioavailable to planktonic communities, in the process influencing atmosphere-ocean carbon fluxes and our global climate. However, the geographical distribution and controlling factors of marine N-2 fixation remain elusive largely due to sparse observations. Here we present unprecedented high-resolution underway N-2 fixation estimates across over 6000 kilometers of the western North Atlantic. Unexpectedly, we find increasing N-2 fixation rates from the oligotrophic Sargasso Sea to North America coastal waters, driven primarily by cyanobacterial diazotrophs. N-2 fixation is best correlated to phosphorus availability and chlorophylla concentration. Globally, intense N-2 fixation activity in the coastal oceans is validated by a meta-analysis of published observations and we estimate the annual coastal N-2 fixation flux to be 16.7 Tg N. This study broadens the biogeography of N-2 fixation, highlights the interplay of regulating factors, and reveals thriving diazotrophic communities in coastal waters with potential significance to the global nitrogen and carbon cycles.
Published: 2019
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29. The Si cycle in the Baffin Bay

Author: Moriceau, Brivaëla, Leynaert, Aude, Gallinari, Morgane, Morata, Nathalie, Lalande, Catherine, Leblanc, Karine, QUEGUINER, Bernard, Justine, Legras, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Laval [Québec] (ULaval), Laboratoire d'océanographie et de biogéochimie (LOB), Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Institut Universitaire Européen de la Mer (IUEM), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2018

30. Impact of copepods on diatom carbon export

Author: Moriceau, Brivaëla, Gallinari, Morgane, Iversen, Morten, Toullec, Jordan, Vincent, Dorothée, Moriceau, Brivaëla, La pompe biologique de carbone: 2 silicifiés essentiels - - BioPSis2016 - ANR-16-CE01-0002 - AAPG2016 - VALID, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Ecosystèmes Littoraux et Cotiers, Université de Lille, Sciences et Technologies-Centre National de la Recherche Scientifique (CNRS), and ANR-16-CE01-0002,BioPSis,La pompe biologique de carbone: 2 silicifiés essentiels(2016)
Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2018

31. Green Edge ice camp campaigns: understanding the processes controlling the under-ice Arctic phytoplankton spring bloom

Author: Massicotte, Philippe, primary, Amiraux, Rémi, additional, Amyot, Marie-Pier, additional, Archambault, Philippe, additional, Ardyna, Mathieu, additional, Arnaud, Laurent, additional, Artigue, Lise, additional, Aubry, Cyril, additional, Ayotte, Pierre, additional, Bécu, Guislain, additional, Bélanger, Simon, additional, Benner, Ronald, additional, Bittig, Henry C., additional, Bricaud, Annick, additional, Brossier, Éric, additional, Bruyant, Flavienne, additional, Chauvaud, Laurent, additional, Christiansen-Stowe, Debra, additional, Claustre, Hervé, additional, Cornet-Barthaux, Véronique, additional, Coupel, Pierre, additional, Cox, Christine, additional, Delaforge, Aurelie, additional, Dezutter, Thibaud, additional, Dimier, Céline, additional, Dominé, Florent, additional, Dufour, Francis, additional, Dufresne, Christiane, additional, Dumont, Dany, additional, Ehn, Jens, additional, Else, Brent, additional, Ferland, Joannie, additional, Forget, Marie-Hélène, additional, Fortier, Louis, additional, Galí, Martí, additional, Galindo, Virginie, additional, Gallinari, Morgane, additional, Garcia, Nicole, additional, Gérikas-Ribeiro, Catherine, additional, Gourdal, Margaux, additional, Gourvil, Priscilla, additional, Goyens, Clemence, additional, Grondin, Pierre-Luc, additional, Guillot, Pascal, additional, Guilmette, Caroline, additional, Houssais, Marie-Noëlle, additional, Joux, Fabien, additional, Lacour, Léo, additional, Lacour, Thomas, additional, Lafond, Augustin, additional, Lagunas, José, additional, Lalande, Catherine, additional, Laliberté, Julien, additional, Lambert-Girard, Simon, additional, Larivière, Jade, additional, Lavaud, Johann, additional, Le Gall, Florence, additional, LeBaron, Anita, additional, Leblanc, Karine, additional, Legras, Justine, additional, Lemire, Mélanie, additional, Levasseur, Maurice, additional, Leymarie, Edouard, additional, Leynaert, Aude, additional, Lopes dos Santos, Adriana, additional, Lourenço, Antonio, additional, Mah, David, additional, Marec, Claudie, additional, Marie, Dominique, additional, Martin, Nicolas, additional, Marty, Constance, additional, Marty, Sabine, additional, Massé, Guillaume, additional, Matsuoka, Atsushi, additional, Matthes, Lisa, additional, Moriceau, Brivaela, additional, Muller, Pierre-Emmanuel, additional, Mundy, Christopher J., additional, Neukermans, Griet, additional, Oziel, Laurent, additional, Panagiotopoulos, Christos, additional, Pangazi, Jean-Jacques, additional, Picard, Ghislain, additional, Picheral, Marc, additional, Pinczon du Sel, France, additional, Pogorzelec, Nicole, additional, Probert, Ian, additional, Queguiner, Bernard, additional, Raimbault, Patrick, additional, Ras, Joséphine, additional, Rehm, Eric, additional, Reimer, Erin, additional, Rontani, Jean-François, additional, Rysgaard, Søren, additional, Saint-Béat, Blanche, additional, Sampei, Makoto, additional, Sansoulet, Julie, additional, Schmidt, Sabine, additional, Sempéré, Richard, additional, Sévigny, Caroline, additional, Shen, Yuan, additional, Tragin, Margot, additional, Tremblay, Jean-Éric, additional, Vaulot, Daniel, additional, Verin, Gauthier, additional, Vivier, Frédéric, additional, Vladoiu, Anda, additional, Whitehead, Jeremy, additional, and Babin, Marcel, additional
Published: 2019
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32. Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Author: Sarthou, Géraldine, primary, Lherminier, Pascale, additional, Achterberg, Eric P., additional, Alonso-Pérez, Fernando, additional, Bucciarelli, Eva, additional, Boutorh, Julia, additional, Bouvier, Vincent, additional, Boyle, Edward A., additional, Branellec, Pierre, additional, Carracedo, Lidia I., additional, Casacuberta, Nuria, additional, Castrillejo, Maxi, additional, Cheize, Marie, additional, Contreira Pereira, Leonardo, additional, Cossa, Daniel, additional, Daniault, Nathalie, additional, De Saint-Léger, Emmanuel, additional, Dehairs, Frank, additional, Deng, Feifei, additional, Desprez de Gésincourt, Floriane, additional, Devesa, Jérémy, additional, Foliot, Lorna, additional, Fonseca-Batista, Debany, additional, Gallinari, Morgane, additional, García-Ibáñez, Maribel I., additional, Gourain, Arthur, additional, Grossteffan, Emilie, additional, Hamon, Michel, additional, Heimbürger, Lars Eric, additional, Henderson, Gideon M., additional, Jeandel, Catherine, additional, Kermabon, Catherine, additional, Lacan, François, additional, Le Bot, Philippe, additional, Le Goff, Manon, additional, Le Roy, Emilie, additional, Lefèbvre, Alison, additional, Leizour, Stéphane, additional, Lemaitre, Nolwenn, additional, Masqué, Pere, additional, Ménage, Olivier, additional, Menzel Barraqueta, Jan-Lukas, additional, Mercier, Herlé, additional, Perault, Fabien, additional, Pérez, Fiz F., additional, Planquette, Hélène F., additional, Planchon, Frédéric, additional, Roukaerts, Arnout, additional, Sanial, Virginie, additional, Sauzède, Raphaëlle, additional, Schmechtig, Catherine, additional, Shelley, Rachel U., additional, Stewart, Gillian, additional, Sutton, Jill N., additional, Tang, Yi, additional, Tisnérat-Laborde, Nadine, additional, Tonnard, Manon, additional, Tréguer, Paul, additional, van Beek, Pieter, additional, Zurbrick, Cheryl M., additional, and Zunino, Patricia, additional
Published: 2018
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33. Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Author: Sarthou, Geraldine, Lherminier, Pascale, Achterberg, Eric P., Alonso-perez, Fernando, Bucciarelli, Eva, Boutorh, Julia, Bouvier, Vincent, Boyle, Edward A., Branellec, Pierre, Carracedo, Lidia, Casacuberta, Nuria, Castrillejo, Maxi, Cheize, Marie, Pereira, Leonardo Contreira, Cossa, Daniel, Daniault, Nathalie, De Saint-leger, Emmanuel, Dehairs, Frank, Deng, Feifei, De Gesincourt, Floriane Desprez, Devesa, Jeremy, Foliot, Lorna, Fonseca-batista, Debany, Gallinari, Morgane, Garcia-ibanez, Maribel I., Gourain, Arthur, Grossteffan, Emilie, Hamon, Michel, Heimburger, Lars Eric, Henderson, Gideon M., Jeandel, Catherine, Kermabon, Catherine, Lacan, Francois, Le Bot, Philippe, Le Goff, Manon, Le Roy, Emilie, Lefebvre, Alison, Leizour, Stephane, Lemaitre, Nolwenn, Masque, Pere, Menage, Olivier, Barraqueta, Jan-lukas Menzel, Mercier, Herle, Perault, Fabien, Perez, Fiz F, Planquette, Helene, Planchon, Frederic, Roukaerts, Arnout, Sanial, Virginie, Sauzede, Raphaelle, Schmechtig, Catherine, Shelley, Rachel U., Stewart, Gillian, Sutton, Jill, Tang, Yi, Tisnerat-laborde, Nadine, Tonnard, Manon, Treguer, Paul, Van Beek, Pieter, Zurbrick, Cheryl M., Zunino Rodriguez, Patricia, Sarthou, Geraldine, Lherminier, Pascale, Achterberg, Eric P., Alonso-perez, Fernando, Bucciarelli, Eva, Boutorh, Julia, Bouvier, Vincent, Boyle, Edward A., Branellec, Pierre, Carracedo, Lidia, Casacuberta, Nuria, Castrillejo, Maxi, Cheize, Marie, Pereira, Leonardo Contreira, Cossa, Daniel, Daniault, Nathalie, De Saint-leger, Emmanuel, Dehairs, Frank, Deng, Feifei, De Gesincourt, Floriane Desprez, Devesa, Jeremy, Foliot, Lorna, Fonseca-batista, Debany, Gallinari, Morgane, Garcia-ibanez, Maribel I., Gourain, Arthur, Grossteffan, Emilie, Hamon, Michel, Heimburger, Lars Eric, Henderson, Gideon M., Jeandel, Catherine, Kermabon, Catherine, Lacan, Francois, Le Bot, Philippe, Le Goff, Manon, Le Roy, Emilie, Lefebvre, Alison, Leizour, Stephane, Lemaitre, Nolwenn, Masque, Pere, Menage, Olivier, Barraqueta, Jan-lukas Menzel, Mercier, Herle, Perault, Fabien, Perez, Fiz F, Planquette, Helene, Planchon, Frederic, Roukaerts, Arnout, Sanial, Virginie, Sauzede, Raphaelle, Schmechtig, Catherine, Shelley, Rachel U., Stewart, Gillian, Sutton, Jill, Tang, Yi, Tisnerat-laborde, Nadine, Tonnard, Manon, Treguer, Paul, Van Beek, Pieter, Zurbrick, Cheryl M., and Zunino Rodriguez, Patricia
Abstract: The GEOVIDE cruise, a collaborative project within the framework of the international GEOTRACES programme, was conducted along the French-led section in the North Atlantic Ocean (Section GA01), between 15 May and 30 June 2014. In this special issue (https://www.biogeosciences.net/special_ issue900.html), results from GEOVIDE, including physical oceanography and trace element and isotope cyclings, are presented among 18 articles. Here, the scientific context, project objectives, and scientific strategy of GEOVIDE are provided, along with an overview of the main results from the articles published in the special issue.
Published: 2018
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34. Copepods Boost the Production but Reduce the Carbon Export Efficiency by Diatoms

Author: Moriceau, Brivaëla, Iversen, Morten H., Gallinari, Morgane, Evertsen, Antti-Jussi O., Le Goff, Manon, Beker, Beatriz, Boutorh, Julia, Corvaisier, Rudolph, Coffineau, Nathalie, Donval, Anne, Giering, Sarah L. C., Koski, Marja, Lambert, Christophe, Lampitt, Richard S., Le Mercier, Alain, Masson, Annick, Stibor, Herwig, Stockenreiter, Maria, De La Rocha, Christina L., Moriceau, Brivaëla, Iversen, Morten H., Gallinari, Morgane, Evertsen, Antti-Jussi O., Le Goff, Manon, Beker, Beatriz, Boutorh, Julia, Corvaisier, Rudolph, Coffineau, Nathalie, Donval, Anne, Giering, Sarah L. C., Koski, Marja, Lambert, Christophe, Lampitt, Richard S., Le Mercier, Alain, Masson, Annick, Stibor, Herwig, Stockenreiter, Maria, and De La Rocha, Christina L.
Abstract: The fraction of net primary production that is exported from the euphotic zone as sinking particulate organic carbon (POC) varies notably through time and from region to region. Phytoplankton containing biominerals, such as silicified diatoms have long been associated with high export fluxes. However, recent reviews point out that the magnitude of export is not controlled by diatoms alone, but determined by the whole plankton community structure. The combined effect of phytoplankton community composition and zooplankton abundance on export flux dynamics, were explored using a set of 12 large outdoor mesocosms. All mesocosms received a daily addition of minor amounts of nitrate and phosphate, while only 6 mesocosms received silicic acid (dSi). This resulted in a dominance of diatoms and dinoflagellate in the +Si mesocosms and a dominance of dinoflagellate in the −Si mesocosms. Simultaneously, half of the mesocosms had decreased mesozooplankton populations whereas the other half were supplemented with additional zooplankton. In all mesocosms, POC fluxes were positively correlated to Si/C ratios measured in the surface community and additions of dSi globally increased the export fluxes in all treatments highlighting the role of diatoms in C export. The presence of additional copepods resulted in higher standing stocks of POC, most probably through trophic cascades. However it only resulted in higher export fluxes for the −Si mesocosms. In the +Si with copepod addition (+Si +Cops) export was dominated by large diatoms with higher Si/C ratios in sinking material than in standing stocks. During non-bloom situations, the grazing activity of copepods decrease the export efficiency in diatom dominated systems by changing the structure of the phytoplankton community and/or preventing their aggregation. However, in flagellate-dominated system, the copepods increased phytoplankton growth, aggregation and fecal pellet production, with overall higher net export not always visible
Published: 2018

35. Introduction to the French GEOTRACES North Atlantic transect (GA01): GEOVIDE cruise

Author: LabexMER, Institut Français de Recherche pour l'Exploitation de la Mer, Agence Nationale de la Recherche (France), Centre National de la Recherche Scientifique (France), Sarthou, Géraldine, Lherminier, Pascale, Achterberg, Eric P., Alonso Pérez, Fernando, Bucciarelli, Eva, Boutorh, Julia, Bouvier, Vincent, Boyle, Edward A., Branellec, Pierre, Carracedo, L., Casacuberta, Nuria, Castrillejo, Maxi, Cheize, Marie, Contreira Pereira, Leonardo, Cossa, Daniel, Daniault, Nathalie, De Saint-Léger, Emmanuel, Dehairs, Frank, Deng, Feifei, Desprez de Gésincourt, Floriane, Devesa, Jérémy, Foliot, Lorna, Fonseca-Batista, Debany, Gallinari, Morgane, García-Ibáñez, Maribel I., Gourain, Arthur, Grossteffan, Emilie, Hamon, Michel, Heimbürger-Boavida, Lars-Eric, Henderson, Gideon M., Jeandel, Catherine, Kermabon, Catherine, Lacan, François, Le Bot, Philippe, Le Goff, Manon, Le Roy, Emilie, Lefèbvre, Alison, Leizour, Stéphane, Lemaitre, Nolwenn, Masqué, Pere, Ménage, Olivier, Menzel Barraqueta, Jan-Lukas, Mercier, Herlé, Perault, Fabien, Pérez, Fiz F., Planquette, Hélène, Planchon, Frédéric, Roukaerts, Arnout, Sanial, Virginie, Sauzède, Raphaëlle, Schmechtig, Catherine, Shelley, Rachel U., Stewart, Gillian, Sutton, Jill N., Tang, Yi, Tisnérat-Laborde, Nadine, Tonnard, Manon, Tréguer, Paul, van Beek, Pieter, Zurbrick, Cheryl M., Zunino, P., LabexMER, Institut Français de Recherche pour l'Exploitation de la Mer, Agence Nationale de la Recherche (France), Centre National de la Recherche Scientifique (France), Sarthou, Géraldine, Lherminier, Pascale, Achterberg, Eric P., Alonso Pérez, Fernando, Bucciarelli, Eva, Boutorh, Julia, Bouvier, Vincent, Boyle, Edward A., Branellec, Pierre, Carracedo, L., Casacuberta, Nuria, Castrillejo, Maxi, Cheize, Marie, Contreira Pereira, Leonardo, Cossa, Daniel, Daniault, Nathalie, De Saint-Léger, Emmanuel, Dehairs, Frank, Deng, Feifei, Desprez de Gésincourt, Floriane, Devesa, Jérémy, Foliot, Lorna, Fonseca-Batista, Debany, Gallinari, Morgane, García-Ibáñez, Maribel I., Gourain, Arthur, Grossteffan, Emilie, Hamon, Michel, Heimbürger-Boavida, Lars-Eric, Henderson, Gideon M., Jeandel, Catherine, Kermabon, Catherine, Lacan, François, Le Bot, Philippe, Le Goff, Manon, Le Roy, Emilie, Lefèbvre, Alison, Leizour, Stéphane, Lemaitre, Nolwenn, Masqué, Pere, Ménage, Olivier, Menzel Barraqueta, Jan-Lukas, Mercier, Herlé, Perault, Fabien, Pérez, Fiz F., Planquette, Hélène, Planchon, Frédéric, Roukaerts, Arnout, Sanial, Virginie, Sauzède, Raphaëlle, Schmechtig, Catherine, Shelley, Rachel U., Stewart, Gillian, Sutton, Jill N., Tang, Yi, Tisnérat-Laborde, Nadine, Tonnard, Manon, Tréguer, Paul, van Beek, Pieter, Zurbrick, Cheryl M., and Zunino, P.
Abstract: The GEOVIDE cruise, a collaborative project within the framework of the international GEOTRACES programme, was conducted along the French-led section in the North Atlantic Ocean (Section GA01), between 15 May and 30 June 2014. In this special issue (https://www.biogeosciences.net/special_issue900.html), results from GEOVIDE, including physical oceanography and trace element and isotope cyclings, are presented among 18 articles. Here, the scientific context, project objectives, and scientific strategy of GEOVIDE are provided, along with an overview of the main results from the articles published in the special issue.
Published: 2018

36. Supplementary material to "Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise"

Author: Sarthou, Géraldine, primary, Lherminier, Pascale, additional, Achterberg, Eric P., additional, Alonso-Pérez, Fernando, additional, Bucciarelli, Eva, additional, Boutorh, Julia, additional, Bouvier, Vincent, additional, Boyle, Edward A., additional, Branellec, Pierre, additional, Carracedo, Lidia I., additional, Casacuberta, Nuria, additional, Castrillejo, Maxi, additional, Cheize, Marie, additional, Contreira Pereira, Leonardo, additional, Cossa, Daniel, additional, Daniault, Nathalie, additional, De Saint-Léger, Emmanuel, additional, Dehairs, Frank, additional, Deng, Feifei, additional, Desprez de Gésincourt, Floriane, additional, Devesa, Jérémy, additional, Foliot, Lorna, additional, Fonseca-Batista, Debany, additional, Gallinari, Morgane, additional, García-Ibáñez, Maribel I., additional, Gourain, Arthur, additional, Grossteffan, Emilie, additional, Hamon, Michel, additional, Heimbürger, Lars Eric, additional, Henderson, Gideon M., additional, Jeandel, Catherine, additional, Kermabon, Catherine, additional, Lacan, François, additional, Le Bot, Philippe, additional, Le Goff, Manon, additional, Le Roy, Emilie, additional, Lefèbvre, Alison, additional, Leizour, Stéphane, additional, Lemaitre, Nolwenn, additional, Masqué, Pere, additional, Ménage, Olivier, additional, Menzel Barraqueta, Jan-Lukas, additional, Mercier, Herlé, additional, Perault, Fabien, additional, Pérez, Fiz F., additional, Planquette, Hélène F., additional, Planchon, Frédéric, additional, Roukaerts, Arnout, additional, Sanial, Virginie, additional, Sauzède, Raphaëlle, additional, Shelley, Rachel U., additional, Stewart, Gillian, additional, Sutton, Jill N., additional, Tang, Yi, additional, Tisnérat-Laborde, Nadine, additional, Tonnard, Manon, additional, Tréguer, Paul, additional, van Beek, Pieter, additional, Zurbrick, Cheryl M., additional, and Zunino, Patricia, additional
Published: 2018
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37. Supplementary material to "Evidence of high N2 fixation rates in productive waters of the temperate Northeast Atlantic"

Author: Fonseca-Batista, Debany, primary, Li, Xuefeng, additional, Riou, Virginie, additional, Michotey, Valérie, additional, Deman, Forian, additional, Fripiat, François, additional, Guasco, Sophie, additional, Brion, Natacha, additional, Lemaitre, Nolwenn, additional, Tonnard, Manon, additional, Gallinari, Morgane, additional, Planquette, Hélène, additional, Planchon, Frédéric, additional, Sarthou, Géraldine, additional, Elskens, Marc, additional, Chou, Lei, additional, and Dehairs, Frank, additional
Published: 2018
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38. Evidence of high N2 fixation rates in productive waters of the temperate Northeast Atlantic

Author: Fonseca-Batista, Debany, primary, Li, Xuefeng, additional, Riou, Virginie, additional, Michotey, Valérie, additional, Deman, Forian, additional, Fripiat, François, additional, Guasco, Sophie, additional, Brion, Natacha, additional, Lemaitre, Nolwenn, additional, Tonnard, Manon, additional, Gallinari, Morgane, additional, Planquette, Hélène, additional, Planchon, Frédéric, additional, Sarthou, Géraldine, additional, Elskens, Marc, additional, Chou, Lei, additional, and Dehairs, Frank, additional
Published: 2018
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39. Supplementary material to "Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01)"

Author: Tonnard, Manon, primary, Planquette, Hélène, additional, Bowie, Andrew R., additional, van der Merwe, Pier, additional, Gallinari, Morgane, additional, Desprez de Gésincourt, Floriane, additional, Germain, Yoan, additional, Gourain, Arthur, additional, Benetti, Marion, additional, Reverdin, Gilles, additional, Tréguer, Paul, additional, Boutorh, Julia, additional, Cheize, Marie, additional, Menzel Barraqueta, Jan-Lukas, additional, Pereira-Contreira, Leonardo, additional, Shelley, Rachel, additional, Lherminier, Pascale, additional, and Sarthou, Géraldine, additional
Published: 2018
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40. Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01)

Author: Tonnard, Manon, primary, Planquette, Hélène, additional, Bowie, Andrew R., additional, van der Merwe, Pier, additional, Gallinari, Morgane, additional, Desprez de Gésincourt, Floriane, additional, Germain, Yoan, additional, Gourain, Arthur, additional, Benetti, Marion, additional, Reverdin, Gilles, additional, Tréguer, Paul, additional, Boutorh, Julia, additional, Cheize, Marie, additional, Menzel Barraqueta, Jan-Lukas, additional, Pereira-Contreira, Leonardo, additional, Shelley, Rachel, additional, Lherminier, Pascale, additional, and Sarthou, Géraldine, additional
Published: 2018
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41. Copepods Boost the Production but Reduce the Carbon Export Efficiency by Diatoms

Author: Moriceau, Brivaëla, primary, Iversen, Morten H., additional, Gallinari, Morgane, additional, Evertsen, Antti-Jussi O., additional, Le Goff, Manon, additional, Beker, Beatriz, additional, Boutorh, Julia, additional, Corvaisier, Rudolph, additional, Coffineau, Nathalie, additional, Donval, Anne, additional, Giering, Sarah L. C., additional, Koski, Marja, additional, Lambert, Christophe, additional, Lampitt, Richard S., additional, Le Mercier, Alain, additional, Masson, Annick, additional, Stibor, Herwig, additional, Stockenreiter, Maria, additional, and De La Rocha, Christina L., additional
Published: 2018
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42. On the potential role of phytoplankton aggregates in microplastics sedimentation

Author: Long, Marc, Moriceau, Brivaëla, Gallinari, Morgane, Lambert, Christophe, Huvet, Arnaud, Paul-Pont, Ika, Hegaret, Helene, Soudant, Philippe, Tito de Morais, Luis, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: ACTI, [SDE.BE] Environmental Sciences/Biodiversity and Ecology, panorama, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, ComputingMilieux_MISCELLANEOUS
Abstract: 00002; International audience; no abstract
Published: 2016

43. Effect of trace metal-limited growth on the postmortem dissolution of the marine diatom Pseudo-nitzschia delicatissima

Author: Boutorh, Julia, Moriceau, Brivaëla, Gallinari, Morgane, Ragueneau, Olivier, Bucciarelli, Eva, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), ANR-10-JCJC-0606,ICOP,Impact des interactions Fe-Cu sur le phytoplancton océanique(2010), ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010), European Project: 264933,EC:FP7:ENV,FP7-ENV-2010,EURO-BASIN(2010), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDE.BE]Environmental Sciences/Biodiversity and Ecology
Abstract: 00000 ăWOS:000372964300004; International audience; We investigated the effects of iron (Fe) and copper (Cu) limitations on biogenic silica (bSiO(2)) dissolution kinetics of the marine diatom Pseudo-nitzschia delicatissima during a 3 week batch dissolution experiment. The dissolution of this species was faster during the first week than thereafter. Modeling results from four dissolution models and scanning electron microcopy images suggested the successive dissolution of two phases of bSiO(2), with two different dissolution constants. Micronutrient limitation during growth affected the respective proportion of the two phases and their dissolution constants. After 3 weeks of dissolution, frustules from micronutrient-limited diatoms were better preserved than those of replete cells. Our results also confirm that micronutrient-limited cells may export more Si relative to N than replete cells and may increase the silicate pump: This may not only be due to a higher degree of silicification of the live cells but also to a decoupling between the recycling of Si and N during dissolution. We suggest that a mechanistic understanding of the evolution of the dissolution constant during dissolution is needed. This would improve the parameterization of dissolution in ecosystem models, and ultimately their predictions on the amount of bSiO(2) that dissolves in the photic zone, and the amount of bSiO(2) that is exported to the seafloor.
Published: 2016

44. Impact Of Growth Stress On Diatom BSiO2 Structure And Recycling

Author: Moriceau, Brivaëla, Boutorh, Julia, Gallinari, Morgane, Soler, Charlotte, Ragueneau, Olivier, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Moriceau, Brivaëla
Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2016

45. Interactions between microplastics and phytoplankton aggregates

Author: Long, Marc, Moriceau, Brivaëla, Gallinari, Morgane, Lambert, Christophe, Huvet, Arnaud, Raffray, Jean, Université de Brest (UBO), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physiologie des Invertébrés [Plouzané] (LPI), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), and Moriceau, Brivaëla
Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2016

46. Dissolution of the biogenic silica: another look on silica structure

Author: Moriceau, Brivaëla, Boutorh, Julia, Gallinari, Morgane, Soler, Charlotte, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Moriceau, Brivaëla
Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2015

47. Microalgae sticks to microplastics and transports them to the seabed. 'Science for Environment Policy'

Author: Long, M., Moriceau, Brivaëla, Gallinari, Morgane, Lambert, Christophe, Huvet, Arnaud, Raffray, J., Soudant, Philippe, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Institut de Recherche pour le Développement (IRD), and Tito de Morais, Claire
Subjects: [SDE.BE] Environmental Sciences/Biodiversity and Ecology, microplastics, ASCL, Microalgae, seabed, Environment, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Policies
Abstract: International audience; Fragments of microplastics are readily incorporated into groups of microscopic algae, altering the rate at which the plastics move through seawater, a recent study has found. In laboratory tests, polystyrene microbeads, which usually sink to the bottom of seawater at a rate of 4mm a day, sank at a rate of several hundreds of metres a daywhen part of microalgae aggregates.
Published: 2015

48. Evidence of high N2 fixation rates in productive waters of the temperate Northeast Atlantic.

Author: Fonseca-Batista, Debany, Xuefeng Li, Riou, Virginie, Michotey, Valérie, Deman, Forian, Fripiat, François, Guasco, Sophie, Brion, Natacha, Lemaitre, Nolwenn, Tonnard, Manon, Gallinari, Morgane, Planquette, Hélène, Planchon, Frédéric, Sarthou, Géraldine, Elskens, Marc, Lei Chou, and Dehairs, Frank
Subjects: NITROGEN fixation, TEMPERATE climate, PRIMARY productivity (Biology), HETEROTROPHIC bacteria
Abstract: Diazotrophic activity and primary production (PP) were investigated along two transects (Belgica BG2014/14 and GEOVIDE cruises) off the western Iberian Margin and the Bay of Biscay (38.8–46.5° N; 8.0–19.7° W) in May 2014 close to the end of the spring bloom. We report substantial N2 fixation activities, reaching up to 65 nmol N L−1 d−1 and 1533 µmol N m−2 d−1 close to the Iberian Margin between 38.8° N and 40.7° N. Similar figures in the basin have only been reported in the temperate and tropical western North Atlantic waters with coastal, shelf or mesohaline characteristics, as opposed to the mostly open ocean conditions studied here. In agreement with previous studies, the qualitative assessment of nifH gene diversity (encoding the nitrogenase enzyme that fixes N2) suggested a predominance of heterotrophic diazotrophs, and the absence of filamentous cyanobacteria. At the sites where N2 fixation activity was highest sequences affiliated to UCYN-A1, obligate symbiont of eukaryotic prymnesiophyte algae, were recovered. The remaining phylotypes were non-cyanobacterial diazotrophs, known to live in association with suspended particles and zooplankton (i.e., Bacteroidetes, Firmicutes and Proteobacteria). Outside the area of exceptional activity, N2 fixation in the open ocean and at shelf-influenced sites was also relatively high, ranging from 81 to 384 µmol N m−2 d−1, but was undetectable in the central Bay of Biscay. We propose that the unexpectedly high heterotrophic N2 fixation activity recorded at the time of our study was sustained by the availability of phytoplankton derived organic matter (dissolved and/or particulate) resulting from the ongoing to post spring bloom. We pose that this organic material not only sustained bacterial production, but also provided sufficient nutrients essential for the nitrogenase activity (e.g., phosphorus). Dissolved Fe was supplied through atmospheric dust deposition during the month preceding our study and through advection of surface waters from the subtropical region and the shelf area. Our findings stress the need for a more detailed monitoring of the spatial and temporal distribution of oceanic N2 fixation in productive waters of the temperate North Atlantic to better constrain the basin-scale nitrogen input to the ocean inventory. [ABSTRACT FROM AUTHOR]
Published: 2018
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49. Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01).

Author: Tonnard, Manon, Planquette, Hélène, Bowie, Andrew R., van der Merwe, Pier, Gallinari, Morgane, Desprez de Gésincourt, Floriane, Germain, Yoan, Gourain, Arthur, Benetti, Marion, Reverdin, Gilles, Tréguer, Paul, Boutorh, Julia, Cheize, Marie, Barraqueta, Jan-Lukas Menzel, Pereira-Contreira, Leonardo, Shelley, Rachel, Lherminier, Pascale, and Sarthou, Géraldine
Subjects: OCEAN-atmosphere interaction, CONVECTION (Meteorology), BOTTOM water (Oceanography), DISSOLUTION (Chemistry)
Abstract: Dissolved Fe (DFe) samples from the GEOVIDE voyage (GEOTRACES GA01, May-June 2014) in the North Atlantic Ocean were analysed using a SeaFAST-picoTM coupled to an Element XR HR-ICP-MS and provided interesting insights on the Fe sources in this area. Overall, DFe concentrations ranged from 0.09 ± 0.01 nmol L-1 to 7.8 ± 0.5 nmol L-1. Elevated DFe concentrations were observed above the Iberian, Greenland and Newfoundland Margins likely due to riverine inputs from the Tagus River, meteoric water inputs and sedimentary inputs. Air-sea interactions were suspected to be responsible for the increase in DFe concentrations within subsurface waters of the Irminger Sea due to deep convection occurring the previous winter, that provided iron-to-nitrate ratios sufficient to sustain phytoplankton growth. Increasing DFe concentrations along the flow path of the Labrador Sea Water were attributed to sedimentary inputs from the Newfoundland Margin. Bottom waters from the Irminger Sea displayed high DFe concentrations likely due to the dissolution of Fe-rich particles from the Denmark Strait Overflow Water and the Polar Intermediate Water. Finally, the nepheloid layers were found to act as either a source or a sink of DFe depending on the nature of particles. [ABSTRACT FROM AUTHOR]
Published: 2018
Full Text: View/download PDF

50. Not all calcite ballast is created equal: differing effects of foraminiferan and coccolith calcite on the formation and sinking of aggregates

Author: Schmidt, K., De La Rocha, C. L., Gallinari, Morgane, Cortese, G., Schmidt, K., De La Rocha, C. L., Gallinari, Morgane, and Cortese, G.
Abstract: Correlation between particulate organic carbon (POC) and calcium carbonate sinking through the deep ocean has led to the idea that ballast provided by calcium carbonate is important for the export of POC from the surface ocean. While this idea is certainly to some extent true, it is worth considering in more nuance, for example, examining the different effects on the aggregation and sinking of POC of small, non-sinking calcite particles like coccoliths and large, rapidly sinking calcite like planktonic foraminiferan tests. We have done that here in a simple experiment carried out in roller tanks that allow particles to sink continuously without being impeded by container walls. Coccoliths were efficiently incorporated into aggregates that formed during the experiment, increasing their sinking speed compared to similarly sized aggregates lacking added calcite ballast. The foraminiferan tests, which sank as fast as 700 md(-1), became associated with only very minor amounts of POC. In addition, when they collided with other, larger, foram-less aggregates, they fragmented them into two smaller, more slowly sinking aggregates. While these effects were certainly exaggerated within the confines of the rolling tanks, they clearly demonstrate that calcium carbonate ballast is not just calcium carbonate ballast -different forms of calcium carbonate ballast have notably different effects on POC aggregation, sinking, and export.
Published: 2014
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