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54. Concentrations, composition, and sources of ice-nucleating particles in the Canadian High Arctic during spring 2016

Author

Si, Meng, primary, Evoy, Erin, additional, Yun, Jingwei, additional, Xi, Yu, additional, Hanna, Sarah J., additional, Chivulescu, Alina, additional, Rawlings, Kevin, additional, Veber, Daniel, additional, Platt, Andrew, additional, Kunkel, Daniel, additional, Hoor, Peter, additional, Sharma, Sangeeta, additional, Leaitch, W. Richard, additional, and Bertram, Allan K., additional

Published
2019
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57. Meteorological conditions during the ACLOUD/PASCAL field campaign near Svalbard in early summer 2017

Author

Knudsen, Erlend M., primary, Heinold, Bernd, additional, Dahlke, Sandro, additional, Bozem, Heiko, additional, Crewell, Susanne, additional, Gorodetskaya, Irina V., additional, Heygster, Georg, additional, Kunkel, Daniel, additional, Maturilli, Marion, additional, Mech, Mario, additional, Viceto, Carolina, additional, Rinke, Annette, additional, Schmithüsen, Holger, additional, Ehrlich, André, additional, Macke, Andreas, additional, Lüpkes, Christof, additional, and Wendisch, Manfred, additional

Published
2018
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59. Meteorological conditions during the ACLOUD/PASCAL field campaign near Svalbard in early summer 2017

Author

Knudsen, Erlend M., Heinold, Bernd, Dahlke, Sandro, Bozem, Heiko, Crewell, Susanne, Gorodetskaya, Irina V., Heygster, Georg, Kunkel, Daniel, Maturilli, Marion, Mech, Mario, Viceto, Carolina, Rinke, Annette, Schmithüsen, Holger, Ehrlich, André, Macke, Andreas, Lüpkes, Christof, Wendisch, Manfred, Knudsen, Erlend M., Heinold, Bernd, Dahlke, Sandro, Bozem, Heiko, Crewell, Susanne, Gorodetskaya, Irina V., Heygster, Georg, Kunkel, Daniel, Maturilli, Marion, Mech, Mario, Viceto, Carolina, Rinke, Annette, Schmithüsen, Holger, Ehrlich, André, Macke, Andreas, Lüpkes, Christof, and Wendisch, Manfred

Published
2018

60. Chemical composition and source attribution of submicron aerosol particles in the summertime Arctic lower troposphere.

Author

Köllner, Franziska, Schneider, Johannes, D. Willis, Megan, Schulz, Hannes, Kunkel, Daniel, Bozem, Heiko, Hoor, Peter, Klimach, Thomas, Helleis, Frank, Burkart, Julia, Richard Leaitch, W., A. Aliabadi, Amir, P. D. Abbatt, Jonathan, B. Herber, Andreas, and Borrmann, Stephan

Abstract

We use airborne measurements of aerosol particle composition to demonstrate the strong contrast between particle sources and composition within and above the summertime Arctic boundary layer. In-situ measurements from two complementary aerosol mass spectrometers, the ALABAMA and the HR-ToF-AMS, with black carbon measurements from an SP2 are presented. Particle composition analysis was complemented by trace gas measurements, satellite data, and air mass history modeling to attribute particle properties to particle origin and air mass source regions. Particle composition above the summertime Arctic boundary layer was dominated by chemically aged particles, containing elemental carbon, nitrate, ammonium, sulfate, and organic matter. From our analysis, we conclude that the presence of these particles was driven by transport of aerosol and precursor gases from mid-latitudes to Arctic regions. Particularly, elevated concentrations of nitrate, ammonium, and organic matter coincided with time spent over vegetation fires in northern Canada. In parallel, those particles were largely present in high CO environments (>& 90& ppbv). Additionally, we observed that the organic-to-sulfate ratio was enhanced with increasing influence from these fires. Besides vegetation fires, particle sources in mid-latitudes further include anthropogenic emissions in Europe, North America, and East Asia. The presence of particles in the Arctic lower free troposphere correlated with time spent over populated and industrial areas in these regions. Further, the size distribution of free tropospheric particles containing elemental carbon and nitrate was shifter to larger diameters compared to particles present within the boundary layer. Moreover, our analysis suggests that organic matter when present in the Arctic free troposphere can partly be identified as low-molecular weight dicarboxylic acids (oxalic, malonic, and succinic acid). Particles containing dicarboxylic acids were largely present when the residence time of air masses outside Arctic regions was high. In contrast, particle composition within the marine boundary layer was largely driven by Arctic regional processes. Air mass history modeling demonstrated that alongside primary sea spray particles, marine-biogenic sources contributed to secondary aerosol formation by trimethylamine, methanesulfonic acid, sulfate, and other organic species. [ABSTRACT FROM AUTHOR]

Published
2020
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61. Supplementary material to "New insights into aerosol and climate in the Arctic"

Author

Abbatt, Jonathan P. D., primary, Leaitch, W. Richard, additional, Aliabadi, Amir A., additional, Bertram, Alan K., additional, Blanchet, Jean-Pierre, additional, Boivin-Rioux, Aude, additional, Bozem, Heiko, additional, Burkart, Julia, additional, Chang, Rachel Y. W., additional, Charette, Joannie, additional, Chaubey, Jai P., additional, Christensen, Robert J., additional, Cirisan, Ana, additional, Collins, Douglas B., additional, Croft, Betty, additional, Dionne, Joelle, additional, Evans, Greg J., additional, Fletcher, Christopher G., additional, Ghahreman, Roya, additional, Girard, Eric, additional, Gong, Wanmin, additional, Gosselin, Michel, additional, Gourdal, Margaux, additional, Hanna, Sarah J., additional, Hayashida, Hakase, additional, Herber, Andreas B., additional, Hesaraki, Sareh, additional, Hoor, Peter, additional, Huang, Lin, additional, Hussherr, Rachel, additional, Irish, Victoria E., additional, Keita, Setigui A., additional, Kodros, John K., additional, Köllner, Franziska, additional, Kolonjari, Felicia, additional, Kunkel, Daniel, additional, Ladino, Luis A., additional, Law, Kathy, additional, Levasseur, Maurice, additional, Libois, Quentin, additional, Liggio, John, additional, Lizotte, Martine, additional, Macdonald, Katrina M., additional, Mahmood, Rashed, additional, Martin, Randall V., additional, Mason, Ryan H., additional, Miller, Lisa A., additional, Moravek, Alexander, additional, Mortenson, Eric, additional, Mungall, Emma L., additional, Murphy, Jennifer G., additional, Namazi, Maryam, additional, Norman, Ann-Lise, additional, O'Neill, Norman T., additional, Pierce, Jeffrey R., additional, Russell, Lynn M., additional, Schneider, Johannes, additional, Schulz, Hannes, additional, Sharma, Sangeeta, additional, Si, Meng, additional, Staebler, Ralf M., additional, Steiner, Nadja S., additional, Galí, Martí, additional, Thomas, Jennie L., additional, von Salzen, Knut, additional, Wentzell, Jeremy J. B., additional, Willis, Megan D., additional, Wentworth, Gregory R., additional, Xu, Jun-Wei, additional, and Yakobi-Hancock, Jacqueline D., additional

Published
2018
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62. New insights into aerosol and climate in the Arctic

Author

Abbatt, Jonathan P. D., primary, Leaitch, W. Richard, additional, Aliabadi, Amir A., additional, Bertram, Alan K., additional, Blanchet, Jean-Pierre, additional, Boivin-Rioux, Aude, additional, Bozem, Heiko, additional, Burkart, Julia, additional, Chang, Rachel Y. W., additional, Charette, Joannie, additional, Chaubey, Jai P., additional, Christensen, Robert J., additional, Cirisan, Ana, additional, Collins, Douglas B., additional, Croft, Betty, additional, Dionne, Joelle, additional, Evans, Greg J., additional, Fletcher, Christopher G., additional, Ghahreman, Roya, additional, Girard, Eric, additional, Gong, Wanmin, additional, Gosselin, Michel, additional, Gourdal, Margaux, additional, Hanna, Sarah J., additional, Hayashida, Hakase, additional, Herber, Andreas B., additional, Hesaraki, Sareh, additional, Hoor, Peter, additional, Huang, Lin, additional, Hussherr, Rachel, additional, Irish, Victoria E., additional, Keita, Setigui A., additional, Kodros, John K., additional, Köllner, Franziska, additional, Kolonjari, Felicia, additional, Kunkel, Daniel, additional, Ladino, Luis A., additional, Law, Kathy, additional, Levasseur, Maurice, additional, Libois, Quentin, additional, Liggio, John, additional, Lizotte, Martine, additional, Macdonald, Katrina M., additional, Mahmood, Rashed, additional, Martin, Randall V., additional, Mason, Ryan H., additional, Miller, Lisa A., additional, Moravek, Alexander, additional, Mortenson, Eric, additional, Mungall, Emma L., additional, Murphy, Jennifer G., additional, Namazi, Maryam, additional, Norman, Ann-Lise, additional, O'Neill, Norman T., additional, Pierce, Jeffrey R., additional, Russell, Lynn M., additional, Schneider, Johannes, additional, Schulz, Hannes, additional, Sharma, Sangeeta, additional, Si, Meng, additional, Staebler, Ralf M., additional, Steiner, Nadja S., additional, Galí, Martí, additional, Thomas, Jennie L., additional, von Salzen, Knut, additional, Wentzell, Jeremy J. B., additional, Willis, Megan D., additional, Wentworth, Gregory R., additional, Xu, Jun-Wei, additional, and Yakobi-Hancock, Jacqueline D., additional

Published
2018
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63. Concentrations, composition, and sources of ice-nucleating particles in the Canadian High Arctic during spring 2016

Author

Si, Meng, primary, Evoy, Erin, additional, Yun, Jingwei, additional, Xi, Yu, additional, Hanna, Sarah, additional, Chivulescu, Alina, additional, Rawlings, Kevin, additional, Platt, Andrew, additional, Kunkel, Daniel, additional, Hoor, Peter, additional, Sharma, Sangeeta, additional, Leaitch, W. Richard, additional, and Bertram, Allan K., additional

Published
2018
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64. Supplementary material to "Concentrations, composition, and sources of ice-nucleating particles in the Canadian High Arctic during spring 2016"

Author

Si, Meng, primary, Evoy, Erin, additional, Yun, Jingwei, additional, Xi, Yu, additional, Hanna, Sarah, additional, Chivulescu, Alina, additional, Rawlings, Kevin, additional, Platt, Andrew, additional, Kunkel, Daniel, additional, Hoor, Peter, additional, Sharma, Sangeeta, additional, Leaitch, W. Richard, additional, and Bertram, Allan K., additional

Published
2018
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66. Supplementary material to "Aircraft measurements of High Arctic springtime aerosol show evidence for vertically varying sources, transport and composition"

Author

Willis, Megan D., primary, Bozem, Heiko, additional, Kunkel, Daniel, additional, Lee, Alex K. Y., additional, Schulz, Hannes, additional, Burkart, Julia, additional, Aliabadi, Amir A., additional, Herber, Andreas B., additional, Leaitch, W. Richard, additional, and Abbatt, Jonathan P. D., additional

Published
2018
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67. High gas-phase mixing ratios of formic and acetic acid in the High Arctic

Author

Mungall, Emma L., primary, Abbatt, Jonathan P. D., additional, Wentzell, Jeremy J. B., additional, Wentworth, Gregory R., additional, Murphy, Jennifer G., additional, Kunkel, Daniel, additional, Gute, Ellen, additional, Tarasick, David W., additional, Sharma, Sangeeta, additional, Cox, Christopher J., additional, Uttal, Taneil, additional, and Liggio, John, additional

Published
2018
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68. High Risk of Anal and Rectal Cancer in Patients With Anal and/or Perianal Crohn’s Disease

Author

Beaugerie, Laurent, primary, Carrat, Fabrice, additional, Nahon, Stéphane, additional, Zeitoun, Jean-David, additional, Sabaté, Jean-Marc, additional, Peyrin-Biroulet, Laurent, additional, Colombel, Jean-Frédéric, additional, Allez, Matthieu, additional, Fléjou, Jean-François, additional, Kirchgesner, Julien, additional, Svrcek, Magali, additional, Cosnes, Jacques, additional, Gendre, Jean-Pierre, additional, Lémann, Marc, additional, Hébuterne, Xavier, additional, Cortot, Antoine, additional, Bouhnik, Yoram, additional, Laharie, David, additional, Dupas, Jean Louis, additional, Flourié, Bernard, additional, Lerebours, Eric, additional, Beaugerie, Laurent, additional, Messing, Bernard, additional, Cadiot, Guillaume, additional, Marteau, Philippe, additional, Soulé, Jean-Claude, additional, Gornet, Jean-Marc, additional, Veyrac, Michel, additional, Duclos, Bernard, additional, Beau, Philippe, additional, Bourreille, Arnaud, additional, Baumer, Philippe, additional, Carbonnel, Franck, additional, Heresbach, Denis, additional, Metman, Etienne-Henry, additional, Florent, Christian, additional, Blain, Antoine, additional, Faucheron, Jean-Luc, additional, Bonaz, Bruno, additional, Roblin, Xavier, additional, Potier, Pascal, additional, Boehm, Christian, additional, Kurtz, Thierry, additional, Lamouliatte, Hervé, additional, Nion-Larmurier, Isabelle, additional, Delchier, Jean-Charles, additional, Chaussade, Stanislas, additional, Weiss, Anne Marie, additional, Cézard, Jean Pierre, additional, Siproudhis, Laurent, additional, Sondag, Daniel, additional, Jian, Raymond, additional, Souquet, Jean-Christophe, additional, Bord, Pierre, additional, Coffin, Benoit, additional, D’almagne, Hélène, additional, Delasalle, Patrick, additional, Fournier, Régis, additional, Cavicchi, Maryan, additional, Souffran, Marc-Henry, additional, Vandromme, Luc, additional, Guedon, Claire, additional, Seksik, Philippe, additional, Michiels, Christophe, additional, Renard, Pascal, additional, Rogier, Patrice, additional, Gouilloud, Sylvie, additional, Rotenberg, André, additional, Savoye, Guillaume, additional, Thevenin, Alain, additional, Mallet, Laurent, additional, Brazier, Franck, additional, Jean, Francois, additional, Justum, Anne-Marie, additional, Latrive, Jean-Paul, additional, Gerbal, Jean-Luc, additional, Pierrugues, Robert, additional, Chardonnal, Gérard, additional, Picon, Laurence, additional, Reix, Nicole, additional, D’aubigny, Nicolas Drouët, additional, Uettwiller, Hervé, additional, Mallet, Anne Courillon, additional, Palacci, Alain, additional, Bensaude, Raoul-Jacques, additional, Bonniaud, Pierre, additional, Empinet, Olivier, additional, Nisard, Andrée, additional, Rudelli, Alain, additional, Tubiana, Bernard, additional, Capelle, Philippe, additional, Dabadie, Alain, additional, Evard, Daniel, additional, Julien, Pierre-Emile, additional, Picon-Coste, Magali, additional, Schneider, Stéphane, additional, Goldfain, Denis, additional, Bellanger, Jérôme, additional, Blondelot, Jean-Pierre, additional, Lamy, Philippe, additional, Lemière, Sébastien, additional, Mockly, Jean Francois, additional, Pellat, Benoit, additional, Gatineau-Sailliant, Gilles, additional, Nalet, Bernard, additional, Nancey, Stéphane, additional, Kusielewicz, Daniel, additional, Loison, Patrick, additional, Popot, Jean-Michel, additional, Merite, François, additional, Roux, Jean-Pol, additional, Afchain, Pauline, additional, Blanquart, Alain, additional, Heyries, Laurent, additional, Reville, Marc, additional, Viron, Dominique, additional, Zerbib, Frank, additional, Claviere, Christophe, additional, Léostic, Didier, additional, Pouderoux, Philippe, additional, Moitry, Alain, additional, Hagège, Hervé, additional, Hugot, Jean-Pierre, additional, Humeau, Benoit, additional, Sabate, Jean-Marc, additional, Lederman, Emmanuel, additional, Lescut, Dominique, additional, Luneau, Fabrice, additional, Mesnard, Bruno, additional, Smadja, Lionel, additional, Steinberg, Michel, additional, Brun, Marc, additional, Macaigne, Gilles, additional, Marchal, Jean Luc, additional, Ollivier, Stéphane, additional, Ouvry, Dominique, additional, Perche, Jean Paul, additional, Rambaud, Serge, additional, Benamouzig, Robert, additional, Cazenave, Jean Louis, additional, Coffin, Jean-Charles, additional, Blazquez, Martine, additional, Lagneau, Marion, additional, Person, Bruno, additional, Wittersheim, Christian, additional, Napoleon, Bertrand, additional, Cemachovic, Israël, additional, Iglicki, Franck, additional, Howaizi, Mehran, additional, Leprince, Eric, additional, Leurent, Bruno, additional, Morin, Thierry, additional, Darsouni, Riad, additional, Attar, Alain, additional, Baron, Philippe, additional, Breton, Anne, additional, Gillion, Jean Marie, additional, Guemene, Jean-Marc, additional, Jouffre, Claude, additional, Moreau, Xavier, additional, Claude, Pierre, additional, Quinton, André, additional, Abitbol, Vered, additional, Brichard, Jean Michel, additional, Desaint, Benoit, additional, Bouygues, Martin, additional, Chatrenet, Philippe, additional, Salmeron, Marcelo, additional, Silvie, Jean, additional, Waldner, Bruno, additional, Emery, Yves, additional, Moraillon, Armand, additional, Kunkel, Daniel, additional, Dubois, Philippe, additional, Faure, Patrick, additional, L'Hirondel, Christian, additional, Labérenne, Jean-Eric, additional, Moreau, Pierre, additional, Pereira, Adelino, additional, Plihon, Genevieve, additional, Wolff, Thierry, additional, Ngo, Yann, additional, Boruchowicz, Arnaud, additional, Jost, Béatrice, additional, Gotlib, Jean Pierre, additional, Danne, Odile, additional, Raoux, Philippe, additional, Ramond-Bouhali, Marie-José, additional, Baetz, Andre, additional, Veyres, Bruno, additional, Chapoutot, Christian, additional, Le Dréau, Gérard, additional, Filippi, Jérôme, additional, Mudry, Jean, additional, Kalt, Philippe, additional, Minault, Sophie, additional, Bounin, Pierre-André, additional, Andréani, Tony, additional, Charneau, Jacky, additional, Reijasse, Didier, additional, Bolze, Jean-Louis, additional, Thaunat, Jean Luc, additional, Le Couteulx, Christian, additional, Maurage, Chantal, additional, Bader, Robert, additional, Codjovi, Philippe, additional, Migairou, Jean-Luc, additional, Morali, Alain, additional, Rey, Philippe, additional, Molard, Bruno Richard, additional, Petit, Richard, additional, Koch, Stéphane, additional, Cassan, Philippe, additional, Deschamps, Jean-Paul, additional, Caby, Christine Meicler, additional, Meurisse, Jean-Jacques, additional, Prades, Philippe, additional, Boulant, James, additional, Diacono, Michel, additional, Monsch, Jean-Marie, additional, Dupuy, J-François, additional, Bellaiche, Guy, additional, Guegan, Martine, additional, Comte, Jean-Marc, additional, Cayla, Jean-Michel, additional, Le Tallec, Francois, additional, Meurisse, Franck, additional, Desurmont, Philippe, additional, Roget, Laurent, additional, Bouyssou, Philippe, additional, Le Gall, Bruno, additional, Bloch, Francis, additional, Larvol, Loic, additional, Jullien, Monique, additional, Moreau, Jacques, additional, Rebouissoux, Laurent, additional, Decroix, Bruno, additional, Dib, Nina, additional, Dieterling, Paul, additional, Lenormand, Frédéric, additional, Lagier, Emmanuel, additional, Fallourd, Philippe, additional, Charpin, Serge, additional, Bertrand, Hugues, additional, Bommelaer, Gilles, additional, Battistelli, Daniel, additional, Delon, Bernard, additional, Dentant, Lionel, additional, Dorval, Etienne, additional, Dumortier, Jérôme, additional, Gaye-Bareyt, Eric, additional, Gerosa, Yves, additional, Guez, Chantal, additional, Mornet, Martine, additional, Benfredj, Paul, additional, Piperaud, René, additional, Stremsdoerfer, Noel, additional, Verdier, Eric, additional, Grinholtz, Alain, additional, Barjonet, Georges, additional, See, Antoine, additional, Arotçarena, Ramuntxo, additional, Baudet, Anne, additional, Broyer, Joel, additional, Charachon, Antoine, additional, Blondon, Hugues, additional, Mouton, Pascal, additional, Claudez, Hubert, additional, Labat-Labourdette, Jacques, additional, Haëm, Jacques, additional, Estable, Patrick, additional, Levy, Patrick, additional, Rosenbaum, Alain, additional, Balavoine, Yvon, additional, Blanchi, Alain, additional, Coutarel, Pierre, additional, Delaperriere, Nadege, additional, Dervichian, Michel, additional, Marois, Francis, additional, Seroka, Jacques, additional, Michaud, Laurent, additional, Leroy, Olivier, additional, Meyran, Emmanuel, additional, Poilroux, Bernard, additional, Tensaouti, Abdallah, additional, Paupard, Thierry, additional, Agard, Dominique, additional, Beaulieu, Sandrine, additional, Benfiguig, Kader, additional, Capony, Patrice, additional, Cottereau, Jean, additional, Desreumaux, Pierre, additional, Dramard, Jean-Michel, additional, Duché, Mathieu, additional, Mamou, Patrick, additional, Etienney, Isabelle, additional, D'Abrigeon, Gilles, additional, Godeberge, Béatrice, additional, Tucat, Gilbert, additional, Puech, Jean, additional, Roger, Jean, additional, Lapalus, Marie-George, additional, Bauret, Paul, additional, Houcke, Philippe, additional, Pornin, Béatrice, additional, Champigneulle, Bruno, additional, Cuissard, Laurent, additional, David, Xavier-Richard, additional, Lombard, Frédéric, additional, Granveau, Antoine, additional, Hamon, Jean-François, additional, Ink, Olivier, additional, Blondel, Fabienne, additional, Namias, Alain, additional, Pillon, Didier, additional, Reignier, Antoine, additional, Tordjman, Gilles, additional, Christidis, Christos, additional, Zirabe, Simon, additional, Audebert, Michel, additional, Bion, Eric, additional, Bourgeaux, Claude, additional, Poupardin, Cécile, additional, Deplaix, Philippe, additional, Fratini, Gérard, additional, Garnier, Thierry, additional, Desseaux, Gerard, additional, Magois, Hervé, additional, Lochum, Sylvain, additional, Vergier, Jean-Francois, additional, Texereau, Patrick, additional, Rat, Christel, additional, Uzzan, Francoise, additional, Vidal, Alain, additional, Vinante, Nadia, additional, Watrin, Bernard, additional, Wurtz-Huckert, Cécile, additional, Barre, Bruno, additional, Ferbus, Dominique Chaslin, additional, Contou, Jean-François, additional, Coupier, Dominique, additional, David, Benoit, additional, Gargot, Dany, additional, Huc, Denis, additional, Barraya, Remy, additional, Faroux, Roger, additional, Fourgeaud, Jean-Luc, additional, Grimprel, Hubert, additional, Auroux, Jean, additional, Rey, Jean-François, additional, Arnoux, Jean Pierre, additional, Lentini, Franck, additional, Tardy, Ludovic, additional, Mouterde, Olivier, additional, Spyckerelle, Claire, additional, Vacherot, Bruno, additional, Weissman, Alain, additional, Alpérine, Michel, additional, Le Sidaner, Anne, additional, Bonnet-Eymard, Pierre-Olivier, additional, Colson, Jean Louis, additional, Pellet, Daniel, additional, Deltombe, Bernard, additional, Edouard, André, additional, Maechel, Henri, additional, Jaillet, Jean-Claude, additional, Genes, Julien, additional, Leveque, Anne-Marie, additional, Lucidarme, Damien, additional, Maignan, Philippe, additional, Gehrke, Nathalie Mallier, additional, Sanchez, Jérôme, additional, Tusseau, Frank, additional, Casteur, Alban, additional, Bottlaender, Jacques, additional, Constantini, Denis, additional, Coton, Thierry, additional, Even, Philippe, additional, Druart, Francois, additional, Riot, François, additional, Gauchet, Jean-Michel, additional, Hecquet, Geneviève, additional, Henry, Gerard, additional, Hochain, Patrick, additional, Arpurt, Jean Pierre, additional, Medini, Abdelkrim, additional, Dartois-Hoguin, Michele, additional, Moindrot, Henri, additional, Emery, Philippe, additional, Periac, Pierre, additional, Prunier, Annie, additional, Renkes, Pascal, additional, Tawil-Longreen, Christine, additional, Vincent, Edmond, additional, Vitte, René-Louis, additional, Loeb, Christian, additional, Carwana, Alain, additional, Barbereau, Didier, additional, Bohon, Philippe, additional, Corrieri-Baizeau, Céline, additional, Sahy, Daniel, additional, Derreveaux, Philippe, additional, David, Dominique, additional, Desbazeille, François, additional, Fontenelle, Patrick, additional, Slama, Jean Luc, additional, Le Mercier, Yvon, additional, Certin, Michel, additional, Reig, Jean Jacques, additional, Rosa, Isabelle, additional, Helbert, Thierry, additional, Tounian, Patrick, additional, Turner, Luc, additional, Perot, Valéry, additional, Aillet, Luc, additional, Pauwels, Arnaud, additional, Barré, Philippe, additional, Nury, Bernard, additional, Cazalbou, Claude, additional, Devulder, Franck, additional, Durget, Alain, additional, Dubroca, Jeanne, additional, Gaudy, Daniele, additional, Greff, Michel, additional, Jacques, Christian, additional, Lafarge, Jocelyne, additional, Kezachian, Gilles, additional, Le Gall, Ronan, additional, Pariente, Alex, additional, Pinault, Tiphaine, additional, Bismuth, Michaël, additional, Boyer-Darrigrand, Nathalie, additional, Bretagnolle, Philippe, additional, Carpentier, Stephane, additional, Cholet, Franck, additional, Theodore, Christian, additional, Combes, Rémi, additional, Combet, Francois, additional, Delanoe, Christophe, additional, De Montigny, Stéphanie, additional, Soudan, Denis, additional, Fourdan, Olivier, additional, Minier, Gilles, additional, Languepin, Jeanne, additional, Roche, Jean, additional, Ginies, Jean-Louis, additional, Nouel, Olivier, additional, Petitgars, Philippe, additional, Robin, Edith, additional, Hamm, Romain, additional, Roques, Jean François, additional, Roussin-Bretagne, Sylvie, additional, Sénéjoux, Agnès, additional, Muron, Sophie, additional, Bardoux, Nicolas, additional, Berthelemy, Philippe, additional, Madonia, Patrick, additional, Carles, Bertrand, additional, Reynier, Catherine, additional, Cuillerier, Emmanuel, additional, Dadamessi, Innocenti, additional, Danis, Jacques, additional, Debenes, Bernard, additional, Dubuc-Rey, Nathalie, additional, Lesur, Gilles, additional, Jouet, Pauline, additional, Lenaerts, Catherine, additional, Garret, Marc, additional, Mineur, Alexandra, additional, Chabry, Bernard, additional, Pigot, Francois, additional, Rossi, Valérie, additional, Tennenbaum, Ruth, additional, Salloum, Julien, additional, Slaoui, Maurice Hakim, additional, Mathieu, Stéphane, additional, Papapietro, Valérie, additional, Viola, Sheila, additional, Bezet, Alexis, additional, Altman, Claude, additional, Audan, Alain, additional, Calabet, Jean, additional, Masliah, Claude, additional, Fayemendy, Laurent, additional, Duruy, Marc, additional, Gauffeny, Benoit, additional, Helie, Ludovic, additional, Imani, Kamran, additional, Janin-Manificat, Raoul, additional, Galmiche, Jean-Paul, additional, Kerlirzin, Anne, additional, Bedenne, Laurent, additional, Locher, Christophe, additional, Michaudel, Gilles, additional, Missonnier, Gilles, additional, Rinaldi-Dovio, Michel, additional, Rouillon, Jean-Michel, additional, Ecuer, Stéphane, additional, Patenotte, Arnaud, additional, Bronstein, Jean Ariel, additional, Baty, Vincent, additional, Bougnol, Michel, additional, Bourbon, Pierre, additional, Cerbelaud, Philippe, additional, Chavaillon, Annick, additional, Boiffin, Franck, additional, Dubern, Béatrice, additional, De Laguierce, Isabelle Duval, additional, Greco, Fernand, additional, Bouhot, Florence, additional, Godeberge, Philippe, additional, Grandmaison, Brigitte, additional, Gros, Pascal, additional, Targues, Guy, additional, Corallo, Jacques, additional, Boutin, Jean, additional, Guillan, Jacques, additional, Barbieux, Jean Pierre, additional, Lariviere, Isabelle Loury, additional, Le Genissel, Henri, additional, Leroi, Henri, additional, Bellaiche, Marc, additional, Elie-Legrand, Marie-Claire, additional, Dapoigny, Michel, additional, Denoyel, Philippe, additional, Pienkowski, Patrice, additional, Pouche, Philippe, additional, Saurfelt, Marc Michel, additional, Thorel, Jean Marie, additional, Piche, Thierry, additional, Travers, Bruno, additional, Tuvignon, Patrick, additional, Zalcberg, Marc, additional, Boulay, Guy, additional, Zamora, Christophe, additional, Samama, Joelle, additional, Ricotie, Etienne, additional, De Fleury, Patrice, additional, Maille, Francois, additional, Mougenel, Jean Louis, additional, Gonot, Olivier, additional, Menat, Jean Philippe, additional, Kaassis, Mehdi, additional, Lang, Francoise, additional, Abramowitz, Laurent, additional, Ganne, Nathalie, additional, Pecriaux, Olivier, additional, Seyrig, Jacques-Arnaud, additional, Sobhani, Iradj, additional, Parmentier, Thierry, additional, Van Nieuwenhuyse, Antoine, additional, Weber, Francois-Xavier, additional, Glibert, André, additional, Bineau, Catherine, additional, Canet, Bernard, additional, Collin, Catherine, additional, Cordet, Frederic, additional, Parlier, David David, additional, Carre, Dominique, additional, Peytier, Annie, additional, Fein, Francine, additional, Barouk, Jerome, additional, Dewannieux, Jacques, additional, Hartwig, Johannes, additional, Jouve, Jean-Louis, additional, Laplane, Bertrand, additional, Lascar, Gilles, additional, Legrand, Christophe, additional, Le Marchand, Pierre, additional, Liebaert, Marie Pierre, additional, Terdiman-Pire, Michele, additional, Abdelli, Naceur, additional, Neveu, Dominique, additional, De La Lande, Philippe, additional, De Saint Louvent, Patrick, additional, Pelatan, Cécile, additional, Petit, Agnès, additional, Richecoeur, Martial, additional, Texier, Frederic, additional, Cazals, Jean Brice, additional, Tissot, Bertrand, additional, Mourrut, Christian, additional, Doubremelle, Marie, additional, Foltz, Marc, additional, Gautier-Jubé, Florence, additional, Martin, Jacques, additional, Khouri, Elie, additional, Lons, Thierry, additional, Carlier-Bandu, Martine, additional, Monnin, Jean-Luc, additional, Roche, Hervé, additional, Willemin, Bernard, additional, Houard, Xavier, additional, Fatisse, Abdelaziz, additional, Algard, Michèle, additional, Arab, Kamel, additional, Borel, Isabelle, additional, Lagarrigue, Cécile, additional, Chryssostalis, Ariane, additional, Boutroux, Dominique, additional, Dupuychaffray, Jean-Pierre, additional, Khaddari, Saïd, additional, Mion, François, additional, Puy-Montbrun, Thierry, additional, Girardet, Jean-Philippe, additional, Gury, Bruno, additional, Landau, Alain, additional, Le Bihan, Monique, additional, Nieuviarts, Sandrine, additional, Ollivry, Jean, additional, Le Bourgeois, Philippe, additional, Piquet, Marie-Astrid, additional, Escartin, Michel -Pierre, additional, Systchenko, Remi, additional, Venezia, Franck, additional, Wantiez, Michel, additional, Lesage, Xavier, additional, Zrihen, Elie, additional, Aygalenq, Philippe, additional, Dieumegard, Barbara, additional, Savarieau, Bernard, additional, Bulois, Philippe, additional, Cattan, Stéphane, additional, Diez, Jean-Lucien, additional, Fauchot, Olivier, additional, Durous, Eric, additional, Gazut, Valérie, additional, Guilleminet, Christian, additional, Bories, Jean-Marc, additional, Le Floch, Isabelle Joly, additional, Vove, Jean-Paul, additional, Lelouch, Stéphane, additional, Lévy, Philippe, additional, Lhopital, François, additional, Marcato, Norma, additional, Mozer-Bernardeau, Marianne, additional, Nousbaum, Jean-Baptiste, additional, Cattan, Philippe, additional, Plane, Alain, additional, Raymond, Jean-Michel, additional, Roseau, Gilles, additional, Rozental, Gerald, additional, Boustière, Christian, additional, Bonny, Corinne, additional, Cordier-Collet, Mariepierre, additional, Courat, Laurent, additional, Croguennec, Bernard, additional, Tardy, Karine Delaunay-, additional, Labarriere, Damien, additional, Geagea, Edmond, additional, Gottrand, Frédéric, additional, Gelsi, Eve, additional, Thiefin, Gerard, additional, Wohlschies, Eric, additional, Miguet, Mathieu, additional, Ponsot, Philippe, additional, Suzanne, Jean, additional, Teste, Yves, additional, Dupont Gossart, Anne-Claire, additional, Baroni, Jean-Luc, additional, Benchaa, Benabdallah, additional, Blanc, Georges, additional, Maroy, Bernard, additional, Bonjean, Philippe, additional, Brézault, Catherine, additional, Bridoux-Henno, Laure, additional, Chayette, Claude, additional, Auby, Dominique, additional, Fiorucci, Robert, additional, Galindo, Georges, additional, Hubert, Gilles, additional, Bonneau, Gilles, additional, Marinier, Evelyne, additional, Pouteau, Michele, additional, Alamdari, Afchine, additional, Delbende, Bruno, additional, Chamouard, Patrick, additional, D'Abravanel, Pascale, additional, Dall'Osto, Hélène, additional, Hervé, Sophie, additional, Lefebvre, Jean, additional, Levoir, Damien, additional, Lillo, Philippe, additional, Rouch, Michel, additional, Mathonnet, Muriel, additional, De Lustrac, Mercédes, additional, Ramond, François-Jean, additional, Roupret, Bernard, additional, and Soupison, Alain, additional

Published
2018
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69. Synoptic development during the ACLOUD/PASCAL field campaign near Svalbard in spring 2017

Author

Knudsen, Erlend M., primary, Heinold, Bernd, additional, Dahlke, Sandro, additional, Bozem, Heiko, additional, Crewell, Susanne, additional, Heygster, Georg, additional, Kunkel, Daniel, additional, Maturilli, Marion, additional, Mech, Mario, additional, Rinke, Annette, additional, Schmithüsen, Holger, additional, Ehrlich, André, additional, Macke, Andreas, additional, Lüpkes, Christof, additional, and Wendisch, Manfred, additional

Published
2018
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70. Temporally delineated sources of major chemical species in high Arctic snow

Author

Macdonald, Katrina M., primary, Sharma, Sangeeta, additional, Toom, Desiree, additional, Chivulescu, Alina, additional, Platt, Andrew, additional, Elsasser, Mike, additional, Huang, Lin, additional, Leaitch, Richard, additional, Chellman, Nathan, additional, McConnell, Joseph R., additional, Bozem, Heiko, additional, Kunkel, Daniel, additional, Lei, Ying Duan, additional, Jeong, Cheol-Heon, additional, Abbatt, Jonathan P. D., additional, and Evans, Greg J., additional

Published
2018
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71. Supplementary material to "High gas-phase mixing ratios of formic and acetic acid in the High Arctic"

Author

Mungall, Emma L., primary, Abbatt, Jonathan P. D., additional, Wentzell, Jeremy J. B., additional, Wentworth, Gregory R., additional, Murphy, Jennifer G., additional, Kunkel, Daniel, additional, Gute, Ellen, additional, Tarasick, David W., additional, Sharma, Sangeeta, additional, Cox, Christopher J., additional, Uttal, Taneil, additional, and Liggio, John, additional

Published
2018
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72. Particulate trimethylamine in the summertime Canadian high Arctic lower troposphere

Author

Köllner, Franziska, primary, Schneider, Johannes, additional, Willis, Megan D., additional, Klimach, Thomas, additional, Helleis, Frank, additional, Bozem, Heiko, additional, Kunkel, Daniel, additional, Hoor, Peter, additional, Burkart, Julia, additional, Leaitch, W. Richard, additional, Aliabadi, Amir A., additional, Abbatt, Jonathan P. D., additional, Herber, Andreas B., additional, and Borrmann, Stephan, additional

Published
2017
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73. Frequent ultrafine particle formation and growth in Canadian Arctic marine and coastal environments

Author

Collins, Douglas B., primary, Burkart, Julia, additional, Chang, Rachel Y.-W., additional, Lizotte, Martine, additional, Boivin-Rioux, Aude, additional, Blais, Marjolaine, additional, Mungall, Emma L., additional, Boyer, Matthew, additional, Irish, Victoria E., additional, Massé, Guillaume, additional, Kunkel, Daniel, additional, Tremblay, Jean-Éric, additional, Papakyriakou, Tim, additional, Bertram, Allan K., additional, Bozem, Heiko, additional, Gosselin, Michel, additional, Levasseur, Maurice, additional, and Abbatt, Jonathan P. D., additional

Published
2017
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75. Particulate trimethylamine in the summertime Canadian high Arctic lower troposphere

Author

Köllner, Franziska, Schneider, Johannes, Willis, Megan D., Klimach, Thomas, Helleis, Frank, Bozem, Heiko, Kunkel, Daniel, Hoor, Peter M., Burkart, Julia, Leaitch, W. Richard, Aliabadi, Amir A., Abbatt, Jonathan P. D., Herber, Andreas B., Borrmann, Stephan, Köllner, Franziska, Schneider, Johannes, Willis, Megan D., Klimach, Thomas, Helleis, Frank, Bozem, Heiko, Kunkel, Daniel, Hoor, Peter M., Burkart, Julia, Leaitch, W. Richard, Aliabadi, Amir A., Abbatt, Jonathan P. D., Herber, Andreas B., and Borrmann, Stephan

Abstract

Size-resolved and vertical profile measurements of single particle chemical composition (sampling altitude range 50–3000 m) were conducted in July 2014 in the Cana- dian high Arctic during an aircraft-based measurement cam- paign (NETCARE 2014). We deployed the single parti- cle laser ablation aerosol mass spectrometer ALABAMA (vacuum aerodynamic diameter range approximately 200– 1000 nm) to identify different particle types and their mix- ing states. On the basis of the single particle analysis, we found that a significant fraction (23 %) of all analyzed parti- cles (in total: 7412) contained trimethylamine (TMA). Two main pieces of evidence suggest that these TMA-containing particles originated from emissions within the Arctic bound- ary layer. First, the maximum fraction of particulate TMA occurred in the Arctic boundary layer. Second, compared to particles observed aloft, TMA particles were smaller and less oxidized. Further, air mass history analysis, associated wind data and comparison with measurements of methane- sulfonic acid give evidence of a marine-biogenic influence on particulate TMA. Moreover, the external mixture of TMA- containing particles and sodium and chloride (“Na/Cl-”) containing particles, together with low wind speeds, sug- gests particulate TMA results from secondary conversion of precursor gases released by the ocean. In contrast to TMA- containing particles originating from inner-Arctic sources, particles with biomass burning markers (such as levoglucosan and potassium) showed a higher fraction at higher al- titudes, indicating long-range transport as their source. Our measurements highlight the importance of natural, marine inner-Arctic sources for composition and growth of summer- time Arctic aerosol.

Published
2017

76. Transport Regimes of Air Masses Affecting the Tropospheric Composition of the Canadian and European Arctic During RACEPAC 2014 and NETCARE 2014/2015

Author

Bozem, Heiko, Hoor, Peter, Koellner, Franziska, Kunkel, Daniel, Schneider, Johannes, Schulz, Christiane, Bodo Herber, Andreas, Borrmann, Stephan, Wendisch, Manfred, Ehrlich, André, Leaitch, Warren, Willis, Megan, Burkart, Julia, Thomas, Jennie L., Abbatt, Jonathan P. D., Johannes Gutenberg - Universität Mainz (JGU), Max Planck Institute for Chemistry (MPIC), Max-Planck-Gesellschaft, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Leipziger Institut für Meteorologie (LIM), Universität Leipzig [Leipzig], Environment and Climate Change Canada, Department of Chemistry [University of Toronto], University of Toronto, TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Cardon, Catherine, Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), and Universität Leipzig

Subjects
[SDE.MCG] Environmental Sciences/Global Changes, [SDU.STU.CL] Sciences of the Universe [physics]/Earth Sciences/Climatology, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, [SDE.MCG]Environmental Sciences/Global Changes
Abstract

International audience; The Arctic is warming much faster than any other place in the world and undergoes a rapid change dominated by a changing climate in this region. The impact of polluted air masses traveling to the Arctic from various remote sources significantly contributes to the observed climate change, in contrast there are additional local emission sources contributing to the level of pollutants (trace gases and aerosol). Processes affecting the emission and transport of these pollutants are not well understood and need to be further investigated.We present aircraft based trace gas measurements in the Arctic during RACEPAC (2014) and NETCARE (2014 and 2015) with the Polar 6 aircraft of Alfred Wegener Institute (AWI) covering an area from 134°W to 17°W and 68°N to 83°N. We focus on cloud, aerosol and general transport processes of polluted air masses into the high Arctic.Based on CO and CO2 measurements and kinematic 10-day back trajectories we analyze the transport regimes prevalent during spring (RACEPAC 2014 and NETCARE 2015) and summer (NETCARE 2014) in the observed region. Whereas the eastern part of the Canadian Arctic is affected by air masses with their origin in Asia, in the central and western parts of the Canadian and European Arctic air masses from North America are predominant at the time of the measurement. In general the more northern parts of the Arctic were relatively unaffected by pollution from mid-latitudes since air masses mostly travel within the polar dome, being quite isolated. Associated mixing ratios of CO and CO2 fit into the seasonal cycle observed at NOAA ground stations throughout the Arctic, but show a more mid-latitudinal characteristic at higher altitudes. The transition is remarkably sharp and allows for a chemical definition of the polar dome. At low altitudes, synoptic disturbances transport polluted air masses from mid-latitudes into regions of the polar dome. These air masses contribute to the Arctic pollution background, but also contain single pollution plumes that perturb the background tracer distribution. These plumes could be traced back to biomass burning or flaring in remote regions, as well as local ship emissions within the measurement region.

Published
2015

77. Supplementary material to "Temporally-Delineated Sources of Major Chemical Species in High Arctic Snow"

Author

Macdonald, Katrina M., primary, Sharma, Sangeeta, additional, Toom, Desiree, additional, Chivulescu, Alina, additional, Platt, Andrew, additional, Elsasser, Mike, additional, Huang, Lin, additional, Leaitch, Richard, additional, Chellman, Nathan, additional, McConnell, Joseph R., additional, Bozem, Heiko, additional, Kunkel, Daniel, additional, Lei, Ying Duan, additional, Jeong, Cheol-Heon, additional, Abbatt, Jonathan P. D., additional, and Evans, Greg J., additional

Published
2017
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78. Temporally-Delineated Sources of Major Chemical Species in High Arctic Snow

Author

Macdonald, Katrina M., primary, Sharma, Sangeeta, additional, Toom, Desiree, additional, Chivulescu, Alina, additional, Platt, Andrew, additional, Elsasser, Mike, additional, Huang, Lin, additional, Leaitch, Richard, additional, Chellman, Nathan, additional, McConnell, Joseph R., additional, Bozem, Heiko, additional, Kunkel, Daniel, additional, Lei, Ying Duan, additional, Jeong, Cheol-Heon, additional, Abbatt, Jonathan P. D., additional, and Evans, Greg J., additional

Published
2017
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79. Boundary layer and free-tropospheric dimethyl sulfide in the Arctic spring and summer

Author

Ghahreman, Roya, primary, Norman, Ann-Lise, additional, Croft, Betty, additional, Martin, Randall V., additional, Pierce, Jeffrey R., additional, Burkart, Julia, additional, Rempillo, Ofelia, additional, Bozem, Heiko, additional, Kunkel, Daniel, additional, Thomas, Jennie L., additional, Aliabadi, Amir A., additional, Wentworth, Gregory R., additional, Levasseur, Maurice, additional, Staebler, Ralf M., additional, Sharma, Sangeeta, additional, and Leaitch, W. Richard, additional

Published
2017
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80. Supplementary material to "Frequent Ultrafine Particle Formation and Growth in the Canadian Arctic Marine Environment"

Author

Collins, Douglas B., primary, Burkart, Julia, additional, Chang, Rachel Y.-W., additional, Lizotte, Martine, additional, Boivin-Rioux, Aude, additional, Blais, Marjolaine, additional, Mungall, Emma L., additional, Boyer, Matthew, additional, Irish, Victoria E., additional, Massé, Guillaume, additional, Kunkel, Daniel, additional, Tremblay, Jean-Éric, additional, Papakyriakou, Tim, additional, Bertram, Allan K., additional, Bozem, Heiko, additional, Gosselin, Michel, additional, Levasseur, Maurice, additional, and Abbatt, Jonathan P. D., additional

Published
2017
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81. Supplementary material to "Particulate trimethylamine in the summertime Canadian high Arctic lower troposphere"

Author

Köllner, Franziska, primary, Schneider, Johannes, additional, Willis, Megan D., additional, Klimach, Thomas, additional, Helleis, Frank, additional, Bozem, Heiko, additional, Kunkel, Daniel, additional, Hoor, Peter, additional, Burkart, Julia, additional, Leaitch, W. Richard, additional, Aliabadi, Amir A., additional, Abbatt, Jonathan P. D., additional, Herber, Andreas B., additional, and Borrmann, Stephan, additional

Published
2017
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82. Frequent Ultrafine Particle Formation and Growth in the Canadian Arctic Marine Environment

Author

Collins, Douglas B., primary, Burkart, Julia, additional, Chang, Rachel Y.-W., additional, Lizotte, Martine, additional, Boivin-Rioux, Aude, additional, Blais, Marjolaine, additional, Mungall, Emma L., additional, Boyer, Matthew, additional, Irish, Victoria E., additional, Massé, Guillaume, additional, Kunkel, Daniel, additional, Tremblay, Jean-Éric, additional, Papakyriakou, Tim, additional, Bertram, Allan K., additional, Bozem, Heiko, additional, Gosselin, Michel, additional, Levasseur, Maurice, additional, and Abbatt, Jonathan P. D., additional

Published
2017
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83. Observations of atmospheric chemical deposition to high Arctic snow

Author

Macdonald, Katrina M., primary, Sharma, Sangeeta, additional, Toom, Desiree, additional, Chivulescu, Alina, additional, Hanna, Sarah, additional, Bertram, Allan K., additional, Platt, Andrew, additional, Elsasser, Mike, additional, Huang, Lin, additional, Tarasick, David, additional, Chellman, Nathan, additional, McConnell, Joseph R., additional, Bozem, Heiko, additional, Kunkel, Daniel, additional, Lei, Ying Duan, additional, Evans, Greg J., additional, and Abbatt, Jonathan P. D., additional

Published
2017
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84. Vertical profile of atmospheric dimethyl sulfide in the Arctic Spring and Summer

Author

Ghahreman, Roya, primary, Norman, Ann-Lise, additional, Croft, Betty, additional, Martin, Randall V., additional, Pierce, Jeffrey R., additional, Burkart, Julia, additional, Rempillo, Ofelia, additional, Bozem, Heiko, additional, Kunkel, Daniel, additional, Thomas, Jennie L., additional, Aliabadi, Amir A., additional, Wentworth, Gregory R., additional, Levasseur, Maurice, additional, Staebler, Ralf M., additional, Sharma, Sangeeta, additional, and Leaitch, Richard, additional

Published
2017
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85. Supplementary material to "Vertical profile of atmospheric dimethyl sulfide in the Arctic Spring and Summer"

Author

Ghahreman, Roya, primary, Norman, Ann-Lise, additional, Croft, Betty, additional, Martin, Randall V., additional, Pierce, Jeffrey R., additional, Burkart, Julia, additional, Rempillo, Ofelia, additional, Bozem, Heiko, additional, Kunkel, Daniel, additional, Thomas, Jennie L., additional, Aliabadi, Amir A., additional, Wentworth, Gregory R., additional, Levasseur, Maurice, additional, Staebler, Ralf M., additional, Sharma, Sangeeta, additional, and Leaitch, Richard, additional

Published
2017
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86. Observations of Atmospheric Chemical Deposition to High Arctic Snow

Author

Macdonald, Katrina M., primary, Sharma, Sangeeta, additional, Toom, Desiree, additional, Chivulescu, Alina, additional, Hanna, Sarah, additional, Bertram, Allan, additional, Platt, Andrew, additional, Elsasser, Mike, additional, Huang, Lin, additional, Chellman, Nathan, additional, McConnell, Joseph R., additional, Bozem, Heiko, additional, Kunkel, Daniel, additional, Lei, Ying Duan, additional, Evans, Greg J., additional, and Abbatt, Jonathan P. D., additional

Published
2016
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87. Supplementary material to "Observations of Atmospheric Chemical Deposition to High Arctic Snow"

Author

Macdonald, Katrina M., primary, Sharma, Sangeeta, additional, Toom, Desiree, additional, Chivulescu, Alina, additional, Hanna, Sarah, additional, Bertram, Allan, additional, Platt, Andrew, additional, Elsasser, Mike, additional, Huang, Lin, additional, Chellman, Nathan, additional, McConnell, Joseph R., additional, Bozem, Heiko, additional, Kunkel, Daniel, additional, Lei, Ying Duan, additional, Evans, Greg J., additional, and Abbatt, Jonathan P. D., additional

Published
2016
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89. Evidence of small-scale quasi-isentropic mixing in ridges of extra-tropical baroclinic waves.

Author

Kunkel, Daniel, Hoor, Peter, Kaluza, Thorsten, Ungermann, Jörn, Kluschat, Björn, Giez, Andreas, Lachnitt, Hans-Christoph, Kaufmann, Martin, and Riese, Martin

Abstract

Stratosphere-troposphere exchange within extratropical cyclones provides the potential for anthropogenic and natural surface emissions to rapidly reach the stratosphere as well as for ozone from the stratosphere to penetrate deep into the troposphere, even down into the boundary layer. The efficiency of this process directly influences the surface climate, the chemistry in the stratosphere, the chemical composition of the extratropical transition layer, and surface pollution levels. Here, we present evidence for a mixing process within extratropical cyclones which has gained only little attention so far and which fosters the transport of tropospheric air masses into the stratosphere in ridges of baroclinic waves. We analyzed airborne measurement data from a research flight of the WISE (Wave driven isentropic exchange) campaign over the North Atlantic in autumn 2017 supported by forecasts from a numerical weather prediction model and trajectory calculations. Further detailed process understanding is obtained from experiments of idealized baroclinic life cycles. The major outcome of this analysis is that air masses mix in the region of the tropopause and potentially enter the stratosphere in ridges of baroclinic waves at the anti-cyclonic side of jet without changing their potential temperature drastically. This quasi-isentropic exchange occurs above the outflow of warm conveyor belts, in regions which exhibit enhanced static stability in the lower stratosphere and a Kelvin-Helmholtz instability across the tropopause. The enhanced static stability is related to radiative cooling below the tropopause and the presence of small scale waves. The Kelvin-Helmholtz instability is related to vertical shear of the horizontal wind associated to small scale waves at the upper edge of the jet-stream. The instability leads to the occurrence of turbulence and consequent mixing of trace gases in the tropopause region. While the overall relevance of this process has yet to be assessed, it has the potential to significantly modify the chemical composition of the extratropical transition layer in the lowermost stratosphere in regions which have previously gained only little attention in terms of mixing in baroclinic waves. [ABSTRACT FROM AUTHOR]

Published
2019
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90. Composite analysis of the tropopause inversion layer in extratropical baroclinic waves.

Author

Kaluza, Thorsten, Kunkel, Daniel, and Hoor, Peter

Abstract

The variability and similarities in the evolution of the tropopause inversion (TIL) layer during cyclongenesis in the North Atlantic storm track are investigated using operational meteorological analysis data (Integrated Forecast System from the European Centre for Medium-Range Weather Forecasts). For this a total amount of 130 cyclones have been analysed which evolved during the months August through October between 2010–2014 over the North Atlantic. Their paths of migration along with associated flow features in the upper troposphere/lower stratosphere (UTLS) have been tracked using the mean sea level pressure. Subsets of the 130 cyclones have been used for composite analysis using minimum sea level pressure to filter the cyclones based on their strength. The composite structure of the TIL strength distribution in connection with the overall UTLS flow strongly resembles the structure of the individual cyclones. Key results are that a strong dipole in tropopause inversion layer strength forms in regions of cyclonic wrap-up of UTLS air masses of different origin and isentropic potential vorticity. These air masses are associated with the cyclonic rotation of the underlaying cyclones. The maximum values of enhanced static stability above the tropopause occur north and northeast of the cyclone centre, vertically aligned with outflow regions of strong updraft and cloud formation up to the tropopause, which are situated in anticyclonic flow patterns in the upper troposphere. These regions are colocated with a maximum of vertical shear of the horizontal wind. The strong wind shear within the TIL results in a local minimum of Richardson numbers, representing the possibility for turbulent instability and potential mixing (or air mass exchange) within regions of enhanced static stability in the lowermost stratosphere. [ABSTRACT FROM AUTHOR]

Published
2018
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96. Concentrations, composition, and sources of ice-nucleating particles in the Canadian High Arctic during spring 2016.

Author

Meng Si, Evoy, Erin, Jingwei Yun, Yu Xi, Hanna, Sarah, Chivulescu, Alina, Rawlings, Kevin, Platt, Andrew, Kunkel, Daniel, Hoor, Peter, Sharma, Sangeeta, Leaitch, W. Richard, and Bertram, Allan K.

Abstract

Modelling studies suggest that the climate and the hydrological cycle are sensitive to the concentrations of ice-nucleating particles (INPs). However, the concentrations, composition, and sources of INPs in the atmosphere remain uncertain. Here we report daily concentrations of INPs and tracers of mineral dust (Al, Fe, Ti, and Mn), sea spray aerosol (Na+ and Cl-), and anthropogenic aerosol (Zn, Pb, NO3-, NH4+, and non-sea-salt SO42-) at Alert, Canada during a three-week campaign in March 2016. The average INP concentrations measured in the immersion freezing mode were approximately 0.005 ± 0.002 L-1, 0.020 ± 0.004 L-1, and 0.186 ± 0.040 L-1 at -15 ºC, -20 ºC, and -25 ºC, respectively. These concentrations are within the range of concentrations measured previously in the Arctic at ground level or sea level. Mineral dust tracers all correlated with INPs at -25 ºC (correlation coefficient, R, ranged from 0.70 to 0.76), suggesting that mineral dust was a major contributor to the INP population. Particle dispersion modelling suggests that the source of the mineral dust may have been the long-range transported dust from the Gobi desert. Sea spray tracers were anti-correlated with INPs at -25 ºC (R = -0.56). In addition, INP concentrations at -25 ºC divided by mass concentrations of aluminum were anti-correlated with sea spray tracers (R = -0.51 and -0.55 for Na+ and Cl-, respectively), suggesting that the components of sea spray aerosol suppressed the ice-nucleating ability of mineral dust in the immersion freezing mode. Correlations between INPs and anthropogenic aerosol tracers were not statistically significant. These results will improve our understanding of INPs in the Arctic during spring. [ABSTRACT FROM AUTHOR]

Published
2018
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97. Aircraft measurements of High Arctic springtime aerosol show evidence for vertically varying sources, transport and composition.

Author

Willis, Megan D., Bozem, Heiko, Kunkel, Daniel, Lee, Alex K. Y., Schulz, Hannes, Burkart, Julia, Aliabadi, Amir A., Herber, Andreas B., Leaitch, W. Richard, and Abbatt, Jonathan P. D.

Abstract

The sources, chemical transformations and removal mechanisms of aerosol transported to the Arctic are key factors that control Arctic aerosol-climate interactions. Our understanding of sources and processes is limited by a lack of vertically resolved observations in remote Arctic regions. We present vertically resolved observations of trace gases and aerosol composition in High Arctic springtime, made largely north of 80° N, during the NETCARE campaign. Trace gas gradients observed on these flights defined the polar dome as north of 66-68.5° N and below potential temperatures of 283.5-287.5 K (Bozem et al., 2018). In the polar dome, we observe evidence for vertically varying source regions and chemical processing. These vertical changes in sources and chemistry lead to systematic variation in aerosol composition as a function of potential temperature. We show evidence for sources of aerosol with higher organic aerosol (OA), ammonium (NH4) and refractory black carbon (rBC) content in the upper polar dome. Based on FLEXPART-ECMWF calculations, air masses sampled at all levels inside the polar dome (i.e., potential temperature < 280.5 K, altitude <∼ 3.5 km) subsided during transport over transport times of at least 10 days. Air masses at the lowest potential temperatures, in the lower polar dome, had spent long times (> 10 days) in the Arctic, while air masses in the upper polar dome had entered the Arctic more recently. These differences in transport history were closely related to aerosol composition. In the lower polar dome, the measured sub-micron aerosol mass was dominated by sulphate (mean 74%), with lesser contributions from rBC (1%), NH4 (4%) and OA (20%). At higher altitudes and warmer potential temperatures, OA, NH4 and rBC contributed 42%, 8% and 2% of aerosol mass, respectively. A qualitative indication for the presence of sea salt showed that sodium chloride contributed to sub-micron aerosol in the lower polar dome, but was not detectable in the upper polar dome. Our observations suggest that long-term, surface-based measurements underestimate the contribution of OA, rBC and NH4 to aerosol transported to the Arctic troposphere in spring. [ABSTRACT FROM AUTHOR]

Published
2018
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98. Synoptic development during the ACLOUD/PASCAL field campaign near Svalbard in spring 2017.

Author

Knudsen, Erlend M., Heinold, Bernd, Dahlke, Sandro, Bozem, Heiko, Crewell, Susanne, Heygster, Georg, Kunkel, Daniel, Maturilli, Marion, Mech, Mario, Rinke, Annette, Schmithüsen, Holger, Ehrlich, André, Macke, Andreas, Lüpkes, Christof, and Wendisch, Manfred

Abstract

The two concerted field campaigns Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) and the Physical feedbacks of Arctic planetary boundary level Sea ice, Cloud and AerosoL (PASCAL) took place near Svalbard from 23 May to 26 June 2017. They were focused on studying Arctic mixed-phase clouds and involved observations from two airplanes (ACLOUD), an icebreaker (PASCAL), as well as surface-based stations, a tethered balloon, and satellites. Here, we present the synoptic development during the 35 day period of the campaigns, using classical near-surface and upper-air meteorological observations, as well as operational satellite and model data. Over the campaign period, short-term synoptic variability was substantial, dominating over the long-term background effect of Arctic amplification. During the first campaign week, cold and dry Arctic air from the north persisted, with a distinct but seasonally unusual cold air outbreak. Cloudy conditions with mostly low-level clouds prevailed. The subsequent two weeks were characterized by warm and moist maritime air from the south and east, which included two warm air advections. These synoptical disturbances caused lower cloud cover fractions and higher-reaching cloud systems. In the final two weeks, adiabatically warmed westerly air dominated, with a strongly varying cloud distribution in between the two other periods. Results presented here provide synoptic information needed to analyze and interpret data of upcoming studies from ACLOUD/PASCAL, while also offering unprecedented measurements in a sparsely observed region. [ABSTRACT FROM AUTHOR]

Published
2018
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99. Urban emission hot spots as sources for remote aerosol deposition

Author

Kunkel, Daniel, Lawrence, Mark G., Tost, Holger, Kerkweg, Astrid, Jöckel, Patrick, and Borrmann, Stephan

Subjects
aerosol, atmospheric chemistry modelling, urban hot-spots, megacities, aerosol transport, Dynamik der Atmosphäre, aerosol deposition
Abstract

Large point sources such as major population centers (MPCs) emit pollutants which can be deposited nearby or transported over long distances before deposition. We have used tracer simulations of aerosols emitted from MPCs worldwide to assess the fractions which are deposited at various distances away from their source location. Considering only source location, prevailing meteorology, and the aerosol size and solubility, we show that fine aerosol particles have a high potential to pollute remote regions. About half of the emitted mass of aerosol tracers with an ambient diameter ≤1.0 μm is typically deposited in regions more than 1000 km away from the source. Furthermore, using the Köppen-Geiger climate classification to categorize the sources into various climate classes we find substantial differences in the deposition potential between these classes. Tracers originating in arid regions show the largest remote deposition potentials, with values more than doubled compared to the smallest potentials from tracers in tropical regions. Seasonal changes in atmospheric conditions lead to variations in the remote deposition potentials. On average the remote deposition potentials in summer correspond to about 70–80% of the values in winter, with a large spread among the climate classes. For tracers from tropical regions the summer remote deposition values are only about 31% of the winter values, while they are about 95% for tracers from arid regions.

Published
2012

100. Aerosols in the tropical and subtropical UT/LS: in-situ measurements of submicron particle abundance and volatility

Author

Borrmann, Stephan, Kunkel, Daniel, Weigel, Ralf, Minikin, Andreas, Deshler, Terry, Wilson, James C., Curtius, Joachim, Volk, C. Michael, Homan, Carine D., Ulanovsky, Alexey, Ravegnani, Fabrizio, Viciani, Silvia, Shur, Genrih N., Belyaev, Gennady V., Law, Kathy S., Cairo, Francesco, Johannes Gutenberg - Universität Mainz (JGU), Max-Planck-Institut für Chemie (MPIC), Max-Planck-Gesellschaft, DLR Institut für Physik der Atmosphäre (IPA), Deutsches Zentrum für Luft- und Raumfahrt [Oberpfaffenhofen-Wessling] (DLR), Department of Atmospheric Science [Laramie], University of Wyoming (UW), Department of Mechanical and Materials Engineering [Denver], University of Denver, Institute for Atmospheric and Environmental Sciences [Frankfurt/Main] (IAU), Goethe-University Frankfurt am Main, Department of Physics, Faculty of Mathematics und Natural Sciences [Wuppertal], University of Wuppertal, Central Aerological Observatory (CAO), Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet), CNR Institute of Atmospheric Sciences and Climate (ISAC), Consiglio Nazionale delle Ricerche (CNR), Istituto Nazionale di Ottica (INO), Myasishchev Design Bureau (MDB), TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), and National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)

Subjects
lcsh:Chemistry, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], lcsh:QD1-999, trace gases, ddc:550, lcsh:Physics, lcsh:QC1-999, aerosols, tropical and subtropical UT/LS
Abstract

Processes occurring in the tropical upper troposphere (UT), the Tropical Transition Layer (TTL), and the lower stratosphere (LS) are of importance for the global climate, for stratospheric dynamics and air chemistry, and for their influence on the global distribution of water vapour, trace gases and aerosols. In this contribution we present aerosol and trace gas (in-situ) measurements from the tropical UT/LS over Southern Brazil, Northern Australia, and West Africa. The instruments were operated on board of the Russian high altitude research aircraft M-55 "Geophysica" and the DLR Falcon-20 during the campaigns TROCCINOX (Araçatuba, Brazil, February 2005), SCOUT-O3 (Darwin, Australia, December 2005), and SCOUT-AMMA (Ouagadougou, Burkina Faso, August 2006). The data cover submicron particle number densities and volatility from the COndensation PArticle counting System (COPAS), as well as relevant trace gases like N2O, ozone, and CO. We use these trace gas measurements to place the aerosol data into a broader atmospheric context. Also a juxtaposition of the submicron particle data with previous measurements over Costa Rica and other tropical locations between 1999 and 2007 (NASA DC-8 and NASA WB-57F) is provided. The submicron particle number densities, as a function of altitude, were found to be remarkably constant in the tropical UT/LS altitude band for the two decades after 1987. Thus, a parameterisation suitable for models can be extracted from these measurements. Compared to the average levels in the period between 1987 and 2007 a slight increase of particle abundances was found for 2005/2006 at altitudes with potential temperatures, Θ, above 430 K. The origins of this increase are unknown except for increases measured during SCOUT-AMMA. Here the eruption of the Soufrière Hills volcano in the Caribbean caused elevated particle mixing ratios. The vertical profiles from Northern hemispheric mid-latitudes between 1999 and 2006 also are compact enough to derive a parameterisation. The tropical profiles all show a broad maximum of particle mixing ratios (between Θ≈340 K and 390 K) which extends from below the TTL to above the thermal tropopause. Thus these particles are a "reservoir" for vertical transport into the stratosphere. The ratio of non-volatile particle number density to total particle number density was also measured by COPAS. The vertical profiles of this ratio have a maximum of 50% above 370 K over Australia and West Africa and a pronounced minimum directly below. Without detailed chemical composition measurements a reason for the increase of non-volatile particle fractions cannot yet be given. However, half of the particles from the tropical "reservoir" contain compounds other than sulphuric acid and water. Correlations of the measured aerosol mixing ratios with N2O and ozone exhibit compact relationships for the tropical data from SCOUT-AMMA, TROCCINOX, and SCOUT-O3. Correlations with CO are more scattered probably because of the connection to different pollution source regions. We provide additional data from the long distance transfer flights to the campaign sites in Brazil, Australia, and West-Africa. These were executed during a time window of 17 months within a period of relative volcanic quiescence. Thus the data represent a "snapshot picture" documenting the status of a significant part of the global UT/LS fine aerosol at low concentration levels 15 years after the last major (i.e., the 1991 Mount Pinatubo) eruption. The corresponding latitudinal distributions of the measured particle number densities are presented in this paper to provide data of the UT/LS background aerosol for modelling purposes.

Published
2010

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