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Overview paper: new insights into aerosol and climate in the Arctic


Abbatt, JPD and Leaitch, WR and Aliabadi, AA and Bertram, AK and Blanchet, J-P and Boivin-Rioux, A and Bozem, H and Burkart, J and Chang, RYW and Charette, J and Chaubey, JP and Christensen, RJ and Cirisan, A and Collins, DB and Croft, B and Dionne, J and Evans, GJ and Fletcher, CG and Gali, M and Ghahremaninezhad, R and Girard, E and Gong, W and Gosselin, M and Gourdal, M and Hanna, SJ and Hayashida, H and Herber, AB and Hesaraki, S and Hoor, P and Huang, L and Hussherr, R and Irish, VE and Keita, SA and Kodros, JK and Kollner, F and Kolonjari, F and Kunkel, D and Ladino, LA and Law, K and Levasseur, M and Libois, Q and Liggio, J and Lizotte, M and Macdonald, KM and Mahmood, R and Martin, RV and Mason, RH and Miller, LA and Moravek, A and Mortenson, E and Mungall, EL and Murphy, JG and Namazi, M and Norman, A-L and O'Neill, NT and Pierce, JR and Russell, LM and Schneider, J and Schulz, H and Sharma, S and Si, M and Staebler, RM and Steiner, NS and Thomas, JL and von Salzen, K and Wentzell, JJB and Willis, MD and Wentworth, GR and Xu, J-W and Yakobi-Hancock, JD, Overview paper: new insights into aerosol and climate in the Arctic, Atmospheric Chemistry and Physics, 19 pp. 2527-2560. ISSN 1680-7316 (2019) [Refereed Article]


Copyright Statement

Copyright 2019 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.5194/acp-19-2527-2019


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 (up to 75 nM) and the overlying atmosphere (up to 1 ppbv) in the Canadian Arctic Archipelago (CAA). Furthermore, melt ponds, which are widely prevalent, were identified as an important DMS source (with DMS concentrations of up to 6 nM and a potential contribution to atmospheric DMS of 20 % in the study area). (2) Evidence of widespread particle nucleation and growth in the marine boundary layer was found in the CAA in the summertime, with these events observed on 41 % of days in a 2016 cruise. As well, at Alert, Nunavut, particles that are newly formed and grown under conditions of minimal anthropogenic influence during the months of July and August are estimated to contribute 20 % to 80 % of the 30–50 nm particle number density. DMS-oxidation-driven nucleation is facilitated by the presence of atmospheric ammonia arising from seabird-colony emissions, and potentially also from coastal regions, tundra, and biomass burning. Via accumulation of secondary organic aerosol (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 (OVOCs) 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, with evidence for a dominant springtime contribution from eastern and southern Asia to the middle troposphere, and a major contribution from northern Asia to the surface. (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 (0.03 cm s−1).

Item Details

Item Type:Refereed Article
Keywords:arctic, aerosol, dimethyl sulfide, oceanography, atmospheric science, chemistry, biogeochemistry
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate change models
UTAS Author:Hayashida, H (Mr Hakase Hayashida)
ID Code:141009
Year Published:2019
Web of Science® Times Cited:87
Deposited By:Oceans and Cryosphere
Deposited On:2020-09-18
Last Modified:2020-10-27
Downloads:12 View Download Statistics

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