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New insights into aerosol and climate in the Arctic

Jonathan P. D. Abbatt 1 W. Richard Leaitch 2 Amir A. Aliabadi 3 Alan K. Bertram 4 Jean-Pierre Blanchet 5 Aude Boivin-Rioux 6 Heiko Bozem 7 Julia Burkart 8 Rachel Y. W. Chang 9 Joannie Charette 6 Jai P. Chaubey 9 Robert J. Christensen 1 Ana Cirisan 5 Douglas B. Collins 10 Betty Croft 9 Joelle Dionne 9 Greg J. Evans 11 Christopher G. Fletcher 12 Roghayeh Ghahremaninezhad 2 Eric Girard 5 Wanmin Gong 2 Michel Gosselin 6 Margaux Gourdal 13 Sarah J. Hanna 4 Hakase Hayashida 14 Andreas B. Herber 15 Sareh Hesaraki 16 Peter Hoor 7 Lin Huang 2 Rachel Hussherr 13 Victoria E. Irish 4 Setigui A. Keita 5 John K. Kodros 17 Franziska Köllner 7, 18 Felicia Kolonjari 2 Daniel Kunkel 7 Luis A. Ladino 19 Kathy S. Law 20 Maurice Levasseur 21 Quentin Libois 5 John Liggio 22 Martine Lizotte 21 Katrina M. Macdonald 11 Rashed Mahmood 14, 23 Randall V. Martin 9 Ryan H. Mason 4 Lisa A. Miller 24 Alexander Moravek 1 Eric Mortenson 14 Emma L. Mungall 1 Jennifer G. Murphy 1 Maryam Namazi 25 Ann-Lise Norman 26 Norman T. O'Neill 16 Jeffrey R. Pierce 17 Lynn M. Russell 27 Johannes Schneider 18 Hannes Schulz 15 Sangeeta Sharma 2 Meng Si 4 Ralf M. Staebler 2 Nadja S. Steiner 24 Marti Gali 21 Jennie L. Thomas 20 Knut von Salzen 23 Jeremy J. B. Wentzell 22 Megan D. Willis 28 Gregory R. Wentworth 1 Jun-Wei Xu 9 Jacqueline D. Yakobi-Hancock 29
20 TROPO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Motivated by the need to predict how the Arctic atmosphere will change in a warming world, this article summarizes recent advances made by the research consortium NETCARE (Network on Climate and Aerosols: Addressing Key Uncertainties in Remote Canadian Environments) that contribute to our fundamental understanding of Arctic aerosol particles as they relate to climate forcing. The overall goal of NETCARE research has been to use an interdisciplinary approach encompassing extensive field observations and a range of chemical transport, earth system, and biogeochemical models. Several major findings and advances have emerged from NETCARE since its formation in 2013 . (1) Unexpectedly high summertime dimethyl sulfide (DMS) levels were identified in ocean water and the overlying atmosphere in the Canadian Arctic Archipelago (CAA). Furthermore, melt ponds, which are widely prevalent, were identified as an important DMS source. (2) Evidence was found of widespread particle nucleation and growth in the marine boundary layer in the CAA in the summertime. DMS-oxidation-driven nucleation is facilitated by the presence of atmospheric ammonia arising from sea bird colony emissions, and potentially also from coastal regions, tundra, and biomass burning. Via accumulation of secondary organic material (SOA), a significant fraction of the new particles grow to sizes that are active in cloud droplet formation. Although the gaseous precursors to Arctic marine SOA remain poorly defined, the measured levels of common continental SOA precursors (isoprene and monoterpenes) were low, whereas elevated mixing ratios of oxygenated volatile organic compounds were inferred to arise via processes involving the sea surface microlayer. (3) The variability in the vertical distribution of black carbon (BC) under both springtime Arctic haze and more pristine summertime aerosol conditions was observed. Measured particle size distributions and mixing states were used to constrain, for the first time, calculations of aerosol–climate interactions under Arctic conditions. Aircraft- and ground-based measurements were used to better establish the BC source regions that supply the Arctic via long-range transport mechanisms. (4) Measurements of ice nucleating particles (INPs) in the Arctic indicate that a major source of these particles is mineral dust, likely derived from local sources in the summer and long-range transport in the spring. In addition, INPs are abundant in the sea surface microlayer in the Arctic, and possibly play a role in ice nucleation in the atmosphere when mineral dust concentrations are low. (5) Amongst multiple aerosol components, BC was observed to have the smallest effective deposition velocities to high Arctic snow.
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Submitted on : Friday, October 12, 2018 - 5:05:35 PM
Last modification on : Friday, October 9, 2020 - 9:52:08 AM

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Jonathan P. D. Abbatt, W. Richard Leaitch, Amir A. Aliabadi, Alan K. Bertram, Jean-Pierre Blanchet, et al.. New insights into aerosol and climate in the Arctic. Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2018, (in press). ⟨insu-01894730⟩

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