Details

Autor(en) / Beteiligte

• Fan, S.M.
• Wofsy, S.C.
• Bakwin, P.S.
• Jacob, D.J.
• Anderson, S.M.
• Kebabian, P.L.
• Mcmanus, J.B.
• Kolb, C.E.
• Fitzjarrald, D.R.

Titel

Micrometeorological measurements of CH[sub 4] and CO[sub 2] exchange between the atmosphere and subarctic tundra

Ist Teil von

• Journal of Geophysical Research; (United States), 1992-10, Vol.97

Ort / Verlag

United States

Erscheinungsjahr

1992

Beschreibungen/Notizen

• Eddy correlation flux measurements and concentration profiles of total hydrocarbons (THC) and CO[sub 2] were combined to provide a comprehensive record of atmosphere-biosphere exchange for these gases over a 30-day period in July-August 1988 in the Yukon-Kuskokwin River Delta of Alaska. Over 90 percent of net ecosystem exchanges of THC were due to methane. Lakes and wet meadow tundra provided the major sources of methane. The average fluxes from lake, dry tundra, and wet tundra were 11 +/- 3, 29 +/- 3, and 57 +/- 6 mg CH4/sq m/d, respectively. The mean remission rate for the site was 25 mg/sq m/d. Maximum uptake of CO[sub 2] by the tundra was 1.4 gC/sq m/d between 1000 and 1500 hrs, and nocturnal respiration averaged 0.73 gC/sq m/d. Net uptake of CO[sub 2] was 0.30 gC/sq m/d for the 30 days of measurement; methane flux accounted for 6 percent of CO2 net uptake. 53 refs.