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Atmospheric chemistry in the Arctic and subarctic - Influence of natural fires, industrial emissions, and stratospheric inputsLayers with enhanced concentrations of trace gases intercepted by the NASA Electra aircraft over Alaska during the Arctic Boundary Layer Expedition (ABLE 3A) in July-August 1988 are discussed. Haze layers apparently associated with boreal fires were enriched in hydrocarbons and NO(y), with emission factors corresponding closely to laboratory data for smoldering combustion. It is argued that atmospheric composition was strongly modified by wildfires during several periods of the ABLE 3A mission. The associated enhancement of NO(y) was smaller than observed for most other combustion processes but was nonetheless significant in the context of very low background concentrations. Ozone production in fire plumes was negligible. Ambient O3 was supplied by the stratosphere, with little direct input from midlatitude source during summer. It is argued that NO(y) was supplied about equally by the stratosphere and by wildfires. Hydrocarbons and CO appear to derive from biomass fires and from human activities.
Document ID
Document Type
Reprint (Version printed in journal)
Wofsy, S. C.
(Harvard Univ. Cambridge, MA, United States)
Sachse, G. W.
(NASA Langley Research Center Hampton, VA, United States)
Gregory, G. L.
(NASA Langley Research Center Hampton, VA, United States)
Blake, D. R.
(California Univ. Irvine, United States)
Bradshaw, J. D.
(NASA Langley Research Center Hampton, VA, United States)
Sandholm, S. T.
(Georgia Inst. of Technology Atlanta, United States)
Singh, H. B.
(NASA Ames Research Center Moffett Field, CA, United States)
Barrick, J. A.
(NASA Langley Research Center Hampton, VA, United States)
Harriss, R. C.
(NASA Langley Research Center Hampton, VA, United States)
Talbot, R. W.
(NASA Langley Research Center Hampton, VA; New Hampshire Univ., Durham, United States)
Date Acquired
August 15, 2013
Publication Date
October 30, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: D15
ISSN: 0148-0227
Subject Category
Environment Pollution
Accession Number
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