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Effects of snow, snowmelting and refreezing processes on air-sea-ice CO2 flux

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Title: Effects of snow, snowmelting and refreezing processes on air-sea-ice CO2 flux
Authors: Nomura, Daiki Browse this author →KAKEN DB
Yoshikawa-Inoue, Hisayuki Browse this author →KAKEN DB
Toyota, Takenobu Browse this author →KAKEN DB
Shirasawa, Kunio Browse this author →KAKEN DB
Issue Date: Jun-2010
Publisher: International Glaciological Society
Journal Title: Journal of Glaciology
Volume: 56
Issue: 196
Start Page: 262
End Page: 270
Abstract: The air-sea-ice CO2 flux was measured in the ice-covered Saroma-ko, a lagoon on the northeastern coast of Hokkaido, Japan, using a chamber technique. The air-sea-ice CO2 flux ranged from -1.8 to +0.5 mg Cm^[-2] h^[-1] (where negative values indicate a sink for atmospheric CO2). The partial pressure of CO2 (pCO2) in the brine of sea ice was substantially lower than that of the atmosphere, primarily because of the influence of the under-ice plume from the Saromabetsu river located in the southeastern part of the lagoon. This suggests that the brine had the ability to take up atmospheric CO2 into the sea ice. However, the snow deposited over the sea ice and the superimposed ice that formed from snowmelting and refreezing partially blocked CO2 diffusion, acting as an impermeable medium for CO2 transfer. Our results suggest that the air-sea-ice CO2 flux was dependent not only on the difference in pCO2 between the brine and the overlying air, but also on the status of the ice surface. These results provide the necessary evidence for evaluation of the gas exchange processes in ice-covered seas.
Rights: © 2010 International Glaciological Society
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 白澤 邦男

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