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Air-lake exchange of methane during the open water season in Syowa Oasis, East Antarctica
- Source :
- JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERE. 115(D16313):1-14
- Publication Year :
- 2010
- Publisher :
- American Geophysical Union (AGU), 2010.
-
Abstract
- [1] Dissolved methane (DM) concentrations were measured in 17 lakes as part of the operations of the 45th Japanese Antarctic Research Expedition in ice-free rocky areas along the eastern coast of Lutzow-Holm Bay (Syowa Oasis) in East Antarctica in the summer of 2003–2004. DM at the surfaces of 14 lakes ranged from the atmospheric equilibrium concentration (about 4 nmol L−1 for freshwater) to 385 nmol L−1. Relatively low DM of less than 50 nmol L−1 were observed in about 60% of the lakes. Many of the lakes (area fraction of 85%) were supersaturated and are thus sources of methane to the atmosphere. The exchange coefficient was calculated using wind speed data at Syowa Station. Area fraction frequency distributions with four surface DM ranges were applied to all lakes at Syowa Oasis (110 lakes, total lake area of 9 km2). Extrapolation to the whole Syowa Oasis gives an estimate of total emission of about 1 t CH4 yr−1. This is the first estimation of methane flux from the surfaces of thawed lakes to the atmosphere in Antarctica. Since a methane efflux of about 2 t CH4 yr−1 was estimated in our previous study from frozen bubbles in lake ice, a total amount of 3 t CH4 yr−1 would be released to the atmosphere from the lakes during the ice melting season (December–January) at Syowa Oasis.
- Subjects :
- Atmospheric Science
Soil Science
Flux
Aquatic Science
Oceanography
Wind speed
Methane
Atmosphere
chemistry.chemical_compound
Geochemistry and Petrology
Earth and Planetary Sciences (miscellaneous)
Cryosphere
Syowa Oasis
Earth-Surface Processes
Water Science and Technology
Ecology
Paleontology
Forestry
East antarctica
East Antarctica
Air-lake exchange
Geophysics
chemistry
Space and Planetary Science
Greenhouse gas
Environmental science
Bay
Subjects
Details
- Language :
- English
- Volume :
- 115
- Issue :
- D16313
- Database :
- OpenAIRE
- Journal :
- JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERE
- Accession number :
- edsair.doi.dedup.....652960168bcf3cf6655508e8a4ae7e1e