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Methane emissions from Alaska Arctic tundra - An assessment of local spatial variabilityThe findings of an extensive midsummer survey of CH4 emissions measurements representing the Alaska Arctic tundra are presented. Variability in rates of emissions was similar in magnitude on local and regional scales, ranging from 0 to 286.5 mg/sq m/d overall and often varying across two orders of magnitude within 0.5 m distances. Primary control on rates of emission was determined by the substrate and position of the water table relative to the surface. Emission rates in the Arctic Foothills ranged from 0.2 mg/sq m/d for tussock tundra to 55.53 mg/sq m/d over wet meadows. Plant-mediated release of CH4 to the atmosphere was directly proportional to green leaf area and represented 92-98 percent of the total emission rates over vegetated sites. The results suggest the current published emission rates may have overestimated the contribution of boreal ecosystems to the global CH4 budget by several fold.
Document ID
19930032545
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Morrissey, L. A.
(NASA Ames Research Center Moffett Field, CA, United States)
Livingston, G. P.
(TGS Technology, Inc.; NASA, Ames Research Center Moffett Field, CA, 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
Geophysics
Accession Number
93A16542
Distribution Limits
Public
Copyright
Other

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