Gas exchange rates measured using a dual-tracer (SF6 and3he) method in the coastal waters of Korea |
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| Authors: | Hyun-Woo Lee Kitack Lee Duk-In Kaown |
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| Institution: | (1) School of Environmental Science and Engineering, Pohang University of Science and Technology, 790-784 Pohang, Korea;(2) School of Earth and Environmental Sciences, Seoul National University, 151-747 Seoul, Korea |
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| Abstract: | Over a period of 5 days between August 12 and 17, 2005, we performed a gas exchange experiment using the dual tracer method
in a tidal coastal ocean located off the southern coast of Korea. The gas exchange rate was determined from temporal changes
in the ratio of3He to SF6 measured daily in the surface mixed layer. The measured gas exchange rate (k
CO
2), normalized to a Schmidt number of 600 for CO2 in fresh water at 20°C, was approximately 5.0 cm h-1 at a mean wind speed of 3.9 m s-1 during the study period. This value is significantly less than those obtained from floating chamber-based experiments performed
previously in estuarine environments, but is similar in magnitude to values obtained using the dual tracer method in river
and tidal coastal waters and values predicted on the basis of the relationship between the gas exchange rate and wind speed
(Wanninkhof 1992), which is generally applicable to the open ocean. Our result is also consistent with the relationship of
Raymond and Cole (2001), which was derived from experiments carried out in estuarine environments using222Rn and chlorofluorocarbons along with measurements undertaken in the Hudson River, Canada, using SF6 and3He. Our results indicate that tidal action in a microtidal region did not discernibly enhance the measuredk
CO
2 value. |
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| Keywords: | gas exchange rate SF6 3He dual tracer coastal ocean |
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