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Quantifying Black Carbon Deposition Over the Greenland Ice Sheet from Forest Fires in CanadaBlack carbon (BC) concentrations observed in 22 snowpits sampled in the northwest sector of the Greenland ice sheet in April 2014 have allowed us to identify a strong and widespread BC aerosol deposition event, which was dated to have accumulated in the pits from two snow storms between 27 July and 2 August 2013. This event comprises a significant portion (57 on average across all pits) of total BC deposition over 10 months (July 2013 to April 2014). Here we link this deposition event to forest fires burning in Canada during summer 2013 using modeling and remote sensing tools. Aerosols were detected by both the Cloud-Aerosol Lidar with Orthogonal Polarization (on board CALIPSO) and Moderate Resolution Imaging Spectroradiometer (Aqua) instruments during transport between Canada and Greenland. We use high-resolution regional chemical transport modeling (WRF-Chem) combined with high-resolution fire emissions (FINNv1.5) to study aerosol emissions, transport, and deposition during this event. The model captures the timing of the BC deposition event and shows that fires in Canada were the main source of deposited BC. However, the model underpredicts BC deposition compared to measurements at all sites by a factor of 2100. Underprediction of modeled BC deposition originates from uncertainties in fire emissions and model treatment of wet removal of aerosols. Improvements in model descriptions of precipitation scavenging and emissions from wildfires are needed to correctly predict deposition, which is critical for determining the climate impacts of aerosols that originate from fires.
Document ID
20170008465
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Thomas, J. L. (Paris VI Univ. France)
Polashenski, C. M. (Army Cold Regions Research and Engineering Lab. Hanover, NH, United States)
Soja, Amber J. (National Inst. of Aerospace Hampton, VA, United States)
Marelle, L. (Center for International Climate and Environmental Research (CICERO) Oslo, Norway)
Casey, K. A. (Dartmouth Coll. Hanover, NH, United States)
Choi, H. D. (National Inst. of Aerospace Hampton, VA, United States)
Raut, J.-C. (Paris VI Univ. France)
Wiedinmyer, C. (National Center for Atmospheric Research Boulder, CO, United States)
Emmons, L. K. (National Center for Atmospheric Research Boulder, CO, United States)
Fast, J. D. (Pacific Northwest National Lab. Richland, WA, United States)
Pelon, J. (Paris VI Univ. France)
Law, K. S. (Paris VI Univ. France)
Flanner, M. G. (Michigan Univ. Ann Arbor, MI, United States)
Dibb, J. E. (New Hampshire Univ. Durham, NH, United States)
Date Acquired
September 5, 2017
Publication Date
August 5, 2017
Publication Information
Publication: Geophysical Research Letters
Volume: 44
Issue: 15
ISSN: 0094-8276
Subject Category
Earth Resources and Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN45973
Funding Number(s)
CONTRACT_GRANT: NSF ARC-1204145
CONTRACT_GRANT: NSF ARC1-203876
CONTRACT_GRANT: NNH15AZ74I
CONTRACT_GRANT: NNX14AE72G
CONTRACT_GRANT: NNH17AE85I
CONTRACT_GRANT: NNL09AA00A
Distribution Limits
Public
Copyright
Other
Keywords
albedo
Antarctica
snow
radiative forcing
remote sensing
black carbon
pollution
ice