Unprecedented atmospheric ammonia concentrations detected in the high Arctic from the 2017 Canadian wildfires

Abstract From 17-22 August 2017 simultaneous enhancements of ammonia (NH3), carbon monoxide (CO), hydrogen cyanide (HCN), and ethane (C2H6) were detected from ground-based solar absorption Fourier transform infrared (FTIR) spectroscopic measurements at two high-Arctic sites: Eureka (80.05°N, 86.42°W...

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Bibliographic Details
Published in:Journal of Geophysical Research: Atmospheres
Main Authors: Lutsch, Erik, Strong, Kimberly, Jones, Dylan B.A., Ortega, Ivan, Hannigan, James W., Dammers, Enrico, Shephard, Mark W., Morris, Eleanor, Murphy, Killian, Evans, Mathew J., Parrington, Mark, Whitburn, Simon, Van Damme, Martin, Clarisse, Lieven, Coheur, Pierre-Francois, Clerbaux, Cathy, Croft, Betty, Martin, Randall V., Pierce, Jeffrey R., Fisher, Jenny A.
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
Arctic
Nunavut
Northwest Territories
Canada
Greenland
British Columbia
Eureka
Canadian Archipelago
Thule
Online Access:https://eprints.whiterose.ac.uk/148358/
https://eprints.whiterose.ac.uk/148358/7/Lutsch_et_al_2019_Journal_of_Geophysical_Research_Atmospheres.pdf
https://doi.org/10.1029/2019JD030419
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Summary:Abstract From 17-22 August 2017 simultaneous enhancements of ammonia (NH3), carbon monoxide (CO), hydrogen cyanide (HCN), and ethane (C2H6) were detected from ground-based solar absorption Fourier transform infrared (FTIR) spectroscopic measurements at two high-Arctic sites: Eureka (80.05°N, 86.42°W) Nunavut, Canada and Thule (76.53°N, 68.74°W), Greenland. These enhancements were attributed to wildfires in British Columbia and the Northwest Territories of Canada using FLEXPART back-trajectories and fire locations from Moderate Resolution Imaging Spectroradiometer (MODIS) and found to be the greatest observed enhancements in more than a decade of measurements at Eureka (2006-2017) and Thule (1999-2017). Observations of gas-phase NH3 from these wildfires illustrates that boreal wildfires may be a considerable episodic source of NH3 in the summertime high Arctic. Comparisons of GEOS-Chem model simulations using the Global Fire Assimilation System (GFASv1.2) biomass burning emissions to FTIR measurements and Infrared Atmospheric Sounding Interferometer (IASI) measurements showed that the transport of wildfire emissions to the Arctic was underestimated in GEOS-Chem. However, GEOS-Chem simulations showed that these wildfires contributed to surface-layer NH3 and enhancements of 0.01-0.11 ppbv and 0.05-1.07 ppbv, respectively, over the Canadian Archipelago from 15-23 August 2017.

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