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Carbon monoxide and methane in the North American Arctic and Subarctic troposphere - July-August 1988Enhanced concentrations of CH4 in the unpolluted atmospheric mixed layer over both Arctic and subarctic tundra landscapes are documented here using data from the NASA Arctic Boundary Layer Expedition (ABLE 3A). The CH4 concentration gradients were determined mainly by interactions of biogenic emission from wet tundra and turbulent mixing proceses. The gradient were most frequently associated with intrusion of upper tropospheric or stratospheric air into the midtroposphere, emissions from forest and tundra fires, and long-range transport of enhanced concentration of these gases from unidentified sources. Summertime haze layers exhibited midtropospheric enhancements of CH4 similar to those measured in winter Arctic events. The observations confirm the importance of Arctic and Subarctic wetland environments as a regional source of global atmospheric CH4.
Document ID
Document Type
Reprint (Version printed in journal)
Harriss, Robert C. (New Hampshire Univ. Durham, United States)
Sachse, Glen W. (NASA Langley Research Center Hampton, VA, United States)
Hill, Gerald F. (NASA Langley Research Center Hampton, VA, United States)
Wade, Larry (Lockheed Engineering & Sciences Co. Hampton, VA, United States)
Bartlett, Karen B. (New Hampshire Univ. Durham, United States)
Collins, James E. (Science and Technology Corp. Hampton, VA, United States)
Steele, L. P. (NASA Langley Research Center Hampton, VA, United States)
Novelli, Paul C. (Cooperative Inst. for Research in Environmental Sciences Boulder, CO, 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
Distribution Limits