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1. Ultra-trace analysis of silver and platinum in seawater by ICP-SFMS after off-line matrix separation and pre-concentration

Author

Lisa Fischer, Geoffrey J. Smith, Stephan Hann, and Kenneth W. Bruland

Subjects
Detection limit, Materials science, Elution, Geotraces, 010401 analytical chemistry, Extraction (chemistry), Analytical chemistry, chemistry.chemical_element, General Chemistry, 010501 environmental sciences, Isotope dilution, Oceanography, 01 natural sciences, 0104 chemical sciences, chemistry, Calibration, Environmental Chemistry, Seawater, Platinum, 0105 earth and related environmental sciences, Water Science and Technology
Abstract

Precise and accurate quantification of Ag and platinum group elements in marine, estuarine and riverine waters is challenging due to the complex matrices and ultra-low concentrations in the pmol kg− 1 and fmol kg− 1 range. A methodological approach has been developed for the analysis of Ag and Pt in seawater based on the extraction of their anionic chloro-complexes utilizing the strong anion exchange resin Dowex™ 1-× 8 in an off-line matrix separation and pre-concentration approach prior to determination by ICP-SFMS. The method allows simultaneous processing of four 100 mL samples at a flow rate of up to 2 mL min− 1 in an ultra-clean manifold. Enrichment factors of 40 could be achieved with elution into 2.5 g of a mixture of HNO3 /HCl, yielding adequately low detection limits to obtain open ocean profiles. Quantification was performed by matrix-matched calibration and internal standardization. To validate the accuracy of this approach, isotope dilution analysis was also used. The applicability of the method was demonstrated on a suite of reference samples and depth profiles collected during the 2009 2nd U.S. GEOTRACES Intercalibration cruise in the eastern North Pacific.

Published
2018
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2. The geotraces intermediate data product 2014

Author

Edward Mawji, Andrew R. Bowie, François Lacan, Kenneth W. Bruland, Oliver J. Lechtenfeld, Laura F. Robinson, Martin Frank, Kuo-Fang Huang, Louise A. Zimmer, Loes J. A. Gerringa, Tobias Roeske, Jingfeng Wu, Célia Venchiarutti, Yanbin Lu, Géraldine Sarthou, Reiner Schlitzer, Tomas A. Remenyi, Yuichiro Kumamoto, Hein J W de Baar, Santiago R. Gonzalez, Mark J. Warner, Mak A. Saito, Peter N. Sedwick, Daniel C. Ohnemus, Evgenia Ryabenko, Emilie Grossteffan, Moritz Zieringer, William J. Jenkins, Gregory F. de Souza, Pinghe Cai, Martin Q. Fleisher, Johnny Stutsman, Yolanda Echegoyen-Sanz, Alessandro Tagliabue, Delphine Lannuzel, Mark Rehkämper, Abigail E. Noble, A. Radic, Lijuan Sha, Micha J. A. Rijkenberg, Mark A. Brzezinski, François Fripiat, Nicholas R. Bates, Toshitaka Gamo, Hisayuki Yoshikawa, Maija Heller, Alan M. Shiller, William M. Smethie, Joaquin E. Chaves, Elena Masferrer Dodas, Torben Stichel, Mark Rosenberg, Hai Cheng, Alicia Navidad, Patrick Laan, Peter Scott, Mark Baskaran, Stephen J.G. Galer, Frédéric Planchon, Jan van Ooijen, Huong Thi Dieu, Steven van Heuven, Feifei Deng, José Marcus Godoy, Catherine Jeandel, Xin Yuan Zheng, Frank Dehairs, Stephen R. Rintoul, Wafa Abouchami, R. Lawrence Edwards, Gideon M. Henderson, Eberhard Fahrbach, Yoshiki Sohrin, Tim M. Conway, Bronwyn Wake, Urumu Tsunogai, Evaline van Weerlee, Maeve C. Lohan, Katrin Bluhm, Robert F. Anderson, Eva Bucciarelli, Ken O. Buesseler, Marie Labatut, Peter Croot, Jana Friedrich, Christopher T. Hayes, Hendrik M. van Aken, James H. Swift, Seth G. John, Sven Kretschmer, Zichen Xue, Karel Bakker, Albert S. Colman, Pierre Branellec, Timothy C. Kenna, Benjamin S. Twining, Marie Boye, Alexander L. Thomas, Karen L. Casciotti, Jessica N. Fitzsimmons, Sabrina Speich, Jun Nishioka, Thomas M. Church, Mariko Hatta, Pere Masqué, Damien Cardinal, Charles R. McClain, Oliver Baars, Frederique le Moigne, Geoffrey J. Smith, Daniel M. Sigman, Edward A. Boyle, Ursula Schauer, Stephanie Owens, E. Malcolm S. Woodward, Maarten B Klunder, Lesley Salt, Gregory A. Cutter, Christopher I. Measures, Hajime Obata, Catherine Pradoux, Ester Garcia Solsona, James W. Moffett, Antje H L Voelker, Gabriel Dulaquais, Paul D. Quay, Saeed Roshan, Rob Middag, Johann Bown, Neil J. Wyatt, Phoebe J. Lam, Edward C.V. Butler, Michiel M Rutgers van der Loeff, Fanny Chever, Cyril Abadie, Viena Puigcorbé, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR), Department of Geosciences [Princeton], Princeton University, Institute for Environmental Research, Rheinisch-Westfälische Technische Hochschule Aachen (RWTH), 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), Antarctic Climate and Ecosystems Cooperative Research Centre (ACE-CRC), Institute for Marine and Antarctic Studies [Horbat] (IMAS), University of Tasmania [Hobart, Australia] (UTAS), 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), University of California, Marine Science Institute [Santa Barbara] (MSI), University of California [Santa Barbara] (UCSB), University of California-University of California, Woods Hole Oceanographic Institution (WHOI), Australian Institute of Marine Science (AIMS), State Key Laboratory of Marine Environmental Science (MEL), Xiamen University, Biogéochimie-Traceurs-Paléoclimat (BTP), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU), NASA Goddard Space Flight Center (GSFC), Institute of Global Environmental Change [China] (IGEC), Xi'an Jiaotong University (Xjtu), Department of Earth Sciences [Minneapolis], University of Minnesota [Twin Cities] (UMN), University of Minnesota System-University of Minnesota System, Bonn University Hospital, College of Earth, Ocean, and Environment [Newark] (CEOE), University of Delaware [Newark], University College of London [London] (UCL), Department of Earth and Ocean Sciences [Columbia], University of South Carolina [Columbia], Old Dominion University [Norfolk] (ODU), Royal Netherlands Institute for Sea Research (NIOZ), Instituto de Química, Universidade de São Paulo, British Oceanographic Data Centre (BODC), National Oceanography Centre (NOC), Lamont-Doherty Earth Observatory (LDEO), Columbia University [New York], Massachusetts Institute of Technology (MIT), Universidad de Dakota del Sur, Helmholtz Centre for Ocean Research [Kiel] (GEOMAR), Bermuda Institute of Ocean Sciences (BIOS), Vrije Universiteit Brussel (VUB), Department of Mathematics and Science, National Taiwan Normal University (NTNU), GEOMAR LEGOS, Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Department of Chemistry, School of Life Sciences, University of Sussex, National Oceanography Centre [Southampton] (NOC), University of Southampton, Institut de Ciencia i Tecnologia Ambientals (ICTA), Universitat Autònoma de Barcelona (UAB), Oceans Institute and School of Physics, The University of Western Australia (UWA), School of Natural Sciences and Centre for Marine Ecosystems Research, Edith Cowan University, EDITH COWAN UNIVERSITY-EDITH COWAN UNIVERSITY, Department of Chemistry [Dunedin], University of Otago [Dunedin, Nouvelle-Zélande], Atmosphere and Ocean Research Institute [Kashiwa-shi] (AORI), The University of Tokyo (UTokyo), Bermuda Biological Station for Research (BBSR), Bermuda Biological Station for Research, Kyoto University [Kyoto], Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), SOEST, University of Hawai‘i [Mānoa] (UHM), FM-GEOMAR, Leibniz Institute of Marine Sciences at the University of Kiel, Department of Earth Ocean and Ecological Sciences [Liverpool], University of Liverpool, Bigelow Laboratory for Ocean Sciences, Department of Biology, Tufts University [Medford], RITE, Research Institute of Innovative Technology for the Earth, Royal Museum for Central Africa [Tervuren] (RMCA), IMT Lille Douai, Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Analytical, Environmental and Geo- Chemistry, Chemistry, Analytical and Environmental Chemistry, Earth System Sciences, Analytical, Environmental & Geo-Chemistry, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National d'Études Spatiales [Toulouse] (CNES)-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), University of Tasmania (UTAS), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN), Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD), University of Minnesota [Twin Cities], Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Universitat Autònoma de Barcelona [Barcelona] (UAB), The University of Tokyo, Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Rheinisch-Westfälische Technische Hochschule Aachen University (RWTH), 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 for Marine and Antarctic Studies [Hobart] (IMAS), University of California (UC), University of California [Santa Barbara] (UC Santa Barbara), University of California (UC)-University of California (UC), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), University Hospital Bonn, Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), University of Sussex, Kyoto University, Laboratoire de physique des océans (LPO), Natural Environment Research Council (NERC), Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences, Boyle, Edward A, Fitzsimmons, Jessica Nicole, Echegoyen Sanz, Yolanda, Ocean Ecosystems, and Isotope Research

Subjects
Chemistry, Multidisciplinary, Geotraces, Digital data, trace elements, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], Biology, Oceanography, ASCII, Isotopes, 0399 Other Chemical Sciences, Electronic atlas, GEOTRACES, Trace elements, 0402 Geochemistry, Environmental Chemistry, Bathymetry, 0405 Oceanography, 14. Life underwater, isotopes, Water Science and Technology, Stable isotopes, NetCDF, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Science & Technology, Information retrieval, ACL, General Chemistry, computer.file_format, Seawater samples, Ocean Data View, Metadata, Marine Sciences, Chemistry, electronic atlas, 13. Climate action, Data quality, Physical Sciences, geotraces, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, computer
Abstract

The GEOTRACES Intermediate Data Product 2014 (IDP2014) is the first publicly available data product of the international GEOTRACES programme, and contains data measured and quality controlled before the end of 2013. It consists of two parts: (1) a compilation of digital data for more than 200 trace elements and isotopes (TEIs) as well as classical hydrographic parameters, and (2) the eGEOTRACES Electronic Atlas providing a strongly inter-linked on-line atlas including more than 300 section plots and 90 animated 3D scenes. The IDP2014 covers the Atlantic, Arctic, and Indian oceans, exhibiting highest data density in the Atlantic. The TEI data in the IDP2014 are quality controlled by careful assessment of intercalibration results and multi-laboratory data comparisons at cross-over stations. The digital data are provided in several formats, including ASCII spreadsheet, Excel spreadsheet, netCDF, and Ocean Data View collection. In addition to the actual data values the IDP2014 also contains data quality flags and 1-σ data error values where available. Quality flags and error values are useful for data filtering. Metadata about data originators, analytical methods and original publications related to the data are linked to the data in an easily accessible way. The eGEOTRACES Electronic Atlas is the visual representation of the IDP2014 data providing section plots and a new kind of animated 3D scenes. The basin-wide 3D scenes allow for viewing of data from many cruises at the same time, thereby providing quick overviews of large-scale tracer distributions. In addition, the 3D scenes provide geographical and bathymetric context that is crucial for the interpretation and assessment of observed tracer plumes, as well as for making inferences about controlling processes., National Science Foundation (U.S.) (OCE-0608600), National Science Foundation (U.S.) (OCE-0938349), National Science Foundation (U.S.) (OCE-1243377)

Published
2015
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3. Comparison of size-dependent carbon, nitrate, and silicic acid uptake rates in high- and low-iron waters

Author

Valerie M. Franck, Geoffrey J. Smith, Mark A. Brzezinski, and Kenneth W. Bruland

Subjects
chemistry.chemical_element, Aquatic Science, Plankton, New production, Oceanography, chemistry.chemical_compound, Nitrate, chemistry, Environmental chemistry, Phytoplankton, Upwelling, Silicic acid, Carbon, Bay
Abstract

We compare the relative contribution of large phytoplankton (.5 and .10 mm) to uptake rates of carbon (C), nitrate (NO ), and dissolved silicon (Si) and uptake ratios of Si : NO and Si : C in Monterey Bay, California (a 2 2 3 3 high-iron region) with three low-iron regions in the eastern tropical Pacific: the Costa Rica upwelling dome, Humboldt current, and Peru upwelling. We also demonstrate the effect of iron enrichment on the above parameters in the latter three regions. In Monterey Bay waters, the .5-mm size fraction accounted on average for the majority of particulate organic C and was responsible for 92% of total C uptake, 81% of total NO uptake, and 98% of total 2 3 Si uptake. In contrast, in low-iron eastern tropical Pacific waters, the .5-mm size fraction accounted for less than half of the particulate organic C and was responsible for a substantially smaller proportion of total C and NO 2 3 uptake: 27‐43% for C and 34‐59% for NO . Iron enrichment experiments in the eastern tropical Pacific resulted 2 3 in much higher NO , C, and Si uptake rates, although increases were restricted to cells in the .5-mm size fraction. 2 3 Si : NO and Si : C uptake ratios decreased after iron addition at most locations, and decreases were a direct result 2 3 of lower Si : NO and Si : C uptake ratios in the .5-mm size fraction. Our results suggest that iron availability is a 2 3 major factor regulating primary production, new production, Si uptake, and Si : NO and Si : C uptake ratios in the 2 3 larger phytoplankton size classes in high-nitrate, low-chlorophyll (HNLC) regions in the eastern tropical Pacific.

Published
2005
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4. Phytoplankton iron limitation in the Humboldt Current and Peru Upwelling

Author

S. F. Riseman, J. Conn, Richard S. Weaver, M. E. Geesey, Eden L. Rue, Kenneth W. Bruland, Geoffrey J. Smith, G. F. Firme, Giacomo R. DiTullio, Clinton E. Hare, Yaohong Zhang, M. B. Alm, J. M. Maucher, Charles G. Trick, and David A. Hutchins

Subjects
Biogeochemical cycle, Chlorophyll a, Aquatic Science, Photosynthetic efficiency, Oceanography, Boundary current, chemistry.chemical_compound, Nutrient, Nitrate, chemistry, Phytoplankton, Environmental science, Upwelling
Abstract

We investigated phytoplankton Fe limitation using shipboard incubation experiments in the high-nutrient South American eastern boundary current regime. Low ambient Fe concentrations (;0.1 nM) in water collected from the Humboldt and Peru Currents were supplemented with a range of added Fe levels up to 2.5 nM. Phytoplankton chlorophyll a, photosystem II photosynthetic efficiency, and nitrate and phosphate drawdown increased in proportion to the amount of Fe added. The Humboldt Current algal community after Fe additions included colonial and flagellated Phaeocystis globosa and large pennate diatoms, whereas the Peru Upwelling assemblage was dominated by coccolithophorids and small pennate diatoms. Apparent half-saturation constants for growth of the two communities were 0.17 nM Fe (Humboldt Current) and 0.26 nM Fe (Peru Upwelling). Net molar dissolved Si(OH)4 : NO drawdown ratios were low in both experiments (;0.2‐0.7), but net particulate silica to nitrogen production 2 3 ratios were higher. Fe limitation decreased net NO : PO utilization ratios in the Humboldt Current incubation to 2 32 34 well below Redfield values. Phytoplankton community sinking rates were decreased by Fe additions in the Peru Upwelling, suggesting potential Fe effects on carbon export. Our results confirm that primary producers in the Peru Upwelling/Humboldt Current system can be limited by Fe, but the biological and biogeochemical consequences of Fe limitation differ from Fe-limited California coastal upwelling waters that have been previously studied.

Published
2002
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5. Iron and macronutrients in California coastal upwelling regimes: Implications for diatom blooms

Author

Eden L. Rue, Geoffrey J. Smith, and Kenneth W. Bruland

Subjects
Chlorophyll a, geography, geography.geographical_feature_category, biology, Continental shelf, fungi, Aquatic Science, Oceanography, biology.organism_classification, chemistry.chemical_compound, Nutrient, Diatom, Nitrate, chemistry, Upwelling, Silicic acid, Bay, Geology
Abstract

The supply of iron, relative to that of the macronutrients nitrate, phosphate, and silicic acid, plays a critical role in allowing extensive diatom blooms to develop in coastal upwelling regimes. The presence or absence of a broad continental shelf influences the supply of iron. The iron input to central California upwelling waters varies spatially and can be characterized by two end-member regimes. One end member, which includes Monterey Bay and extending north to Pt. Reyes, is an iron-replete regime where upwelling occurs over a relatively broad continental shelf that results in waters with high concentrations of dissolved and particulate iron ( .10 nM) entrained together with high concentrations of nitrate and silicic acid. In these iron-replete regions, extensive blooms of large diatoms deplete macronutrient concentrations, which results in correspondingly high chlorophyll a concentrations. The other end member, located to the south of Monterey Bay off the Big Sur coast, is an iron-deplete regime where upwelling is focused offshore of a narrow continental shelf. Upwelled waters in the Big Sur region are characterized by low dissolved and particulate iron concentrations (,1 nM), together with high concentrations of nitrate and silicic acid. Extremely low iron concentrations, unused nitrate and silicic acid, and a low abundance of large diatoms characterize surface waters in these iron-deplete regions, and thus represent coastal upwelling, high-nutrient, low-chlorophyll systems limited by the micronutrient iron.

Published
2001
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6. Factors influencing the chemistry of the near-field Columbia River plume: Nitrate, silicic acid, dissolved Fe, and dissolved Mn

Author

Bettina Sohst, Geoffrey J. Smith, António M. Baptista, Kenneth W. Bruland, Ana M. Aguilar-Islas, and Maeve C. Lohan

Subjects
Atmospheric Science, Soil Science, Aquatic Science, Oceanography, chemistry.chemical_compound, Nitrate, Geochemistry and Petrology, Downwelling, Earth and Planetary Sciences (miscellaneous), Panache, Silicic acid, Earth-Surface Processes, Water Science and Technology, geography, geography.geographical_feature_category, Ecology, Chemistry, Paleontology, Forestry, Estuary, Plume, Geophysics, Space and Planetary Science, Upwelling, Seawater
Abstract

[1] Factors influencing concentrations of nitrate, silicic acid, dissolved Fe, and dissolved Mn in the near-field Columbia River plume were examined during late spring and summer from 2004 to 2006 as part of the River Influences on Shelf Ecosystems program. Under upwelling-active phases, cold, high-nitrate coastal seawater was entrained in the plume, and nitrate concentrations of 16–19 μM were observed with as much as 90% from a coastal seawater origin. Under downwelling-relaxation phases, warm, nutrient-depleted coastal seawater was entrained forming a near-field plume with nitrate concentrations of 2.5–6 μM, with the river as the only source. Elevated silicic acid in the river is the dominant source, with concentrations of 60–80 μM in the near-field plume. During upwelling-active phases, high concentrations of dissolved Fe (as high as 40 nM) in the cold, low-oxygen, nutrient-rich coastal seawater were entrained to form a near-field plume with 15–20 nM dissolved Fe. During downwelling-relaxation phases, dissolved Fe in the intruding underlying warm coastal seawater was 1–3 nM, producing plume concentrations of 2–13 nM, with higher concentrations during the high river flow of May 2006. Dissolved Mn in the near-field plume covaried markedly as a function of increased tidal flushing in the estuary. The use of CORIE (pilot environmental observation and forecasting system for the Columbia River) time series conductivity-temperature-depth data within the estuary, along with data presented in this study, allows extrapolation of the near-field plume chemistry throughout the spring and summer seasons to provide insight into this important source of nutrients to the coastal waters in this region.

Published
2008
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7. Silver in San Francisco Bay Estuarine Waters

Author

A. Russell Flegal and Geoffrey J. Smith

Subjects
Biogeochemical cycle, geography, geography.geographical_feature_category, Fluvial, Estuary, Aquatic Science, Particulates, Oceanography, Wastewater, Benthic zone, Environmental Chemistry, Environmental science, Water pollution, Bay, General Environmental Science
Abstract

Spatial gradients of silver concentrations in the surface waters of San Francisco Bay reveal substantial anthropogenic perturbations of the biogeochemical cycle of the element throughout the estuarine system. The most pronounced perturbations are in the south bay, where dissolved (

Published
1993
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