TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 66 (No. 3), pp. 363-372, 2010

Air-Sea Gas Transfer in a Shallow, Flowing and Coastal Environment Estimated by Dissolved Inorganic Carbon and Dissolved Oxygen Analyses

Osamu Abe1*, Atsushi Watanabe2, VVSS Sarma3,4, Yohei Matsui5, Hiroya Yamano6, Naohiro Yoshida7 and Toshiro Saino8,9

1Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan
2Graduate School of Information Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
3National Institute of Oceanography, 176 Lawsons Bay Colony, Visakhapatnam-17, India
4Council of Scientific and Industrial Research, India
5School of Earth Science, Ohio State University, Columbus, OH 43210, U.S.A.
6National Institute of Environmental Studies, Tsukuba 305-8506, Japan
7Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama 226-8502, Japan
8Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan
9Japan Science and Technology Agency, Kawaguchi 332-0012, Japan

(Received 3 July 2009; in revised form 25 January 2010; accepted 26 January 2010)

Abstract: We estimated gas exchange rates in Kabira Reef at Ishigaki Island, southwest Japan, using a mass balance calculation with dual "biological" tracers: dissolved inorganic carbon (DIC) and dissolved oxygen (DO). The nighttime results allowed us to obtain reasonable gas transfer velocity kw values, all of which exceeded those obtained in wind-dominant studies. The difference is likely due to the contribution of turbulence generated by the interaction between the current and bottom topography. The kw obtained during high tides is consistent with that reported by Raymond and Cole (2001), whereas kw during low tides is significantly higher, which seems to be caused by enhanced friction with the bottom of the reef and/or bubble-induced gas transfer by wave breaking at the reef crest.

*Corresponding author E-mail: osamu.abe@nagoya-u.jp

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