Abstract
Integrated annual methane fluxes measured from 1994 to 1996 at sites representing specific tundra vegetation and land cover types were weighted areally using a vegetation map [Auerbach et al, 1997] for the Kuparuk River basin and subareas. Wetland and open water CH4emissions dominate the Kuparuk River basin emission estimate. Areal weighting of site fluxes resulted in a regional CH4emission estimate of 2.09×1010g CH4yr−1for the Kuparuk River basin. The global CH4emission obtained by extending areally weighted annual fluxes from this study to global tundra area (7.34×1012m2) is 5.83 Tg CH4yr−1. This is about 15% of theFung et al.[1991] atmospheric tracer model estimate and indicates that the vegetation distribution of the Kuparuk River Basin is not typical of the entire Arctic. Reconciling results from atmospheric tracer model estimates and areally weighted field flux measurements will require accurate high‐resolution circumpolar estimates of wetland and open water areas and fluxes.
Highlights
For simplicity,we haveuseda basin- vegetation-specifCicH4 fluxesto a HGIS to obtainestimatesof wideestimateof integratedannualflux for openwaterareas
Total CH4 emissionis resultingfrom this work are similar for the entire arctic and heavilyinfluencebdythearealcoveragoef thetwohighesCt H4 extendintgheareallyweighteCd fluxesfortheentiremapand emissionland covercategoriesw, etlandsa, nd openwaters. theKupmikRiverwatershe0d.,796and0.753gCH4mayr,toa
Research,University of Colorado,Boulder,CO 80309-0450. (e-mail: (ReceivedAugust12, 1997;revisedMarch11, 1998; auerbachstripe.colorado.edsuw;alkertaimyr.colorado.edu) acceptedMarch 11, 1998.)
Summary
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