Estimating of gas transfer velocity using triple isotopes of dissolved oxygen |
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Authors: | V V S S Sarma Osamu Abe Makio Honda Toshiro Saino |
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Institution: | (1) Department of Plant and Environmental Sciences, Hebrew University of Jerusalem, Jerusalem, 91014, Israel;(2) Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, 91904, Israel; |
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Abstract: | The atmosphere-ocean exchange of climatically important gases is determined by the transfer velocity (k) and concentration gradient across the interface. Based on observations in the northwestern subarctic Pacific and Sagami
Bay, we report here the results of the first ever application of the natural abundance of triple isotopes of dissolved oxygen
(16O, 17O and 18O) for direct estimation of k and propose a new relationship with wind speed. The k values estimated from nighttime variations in oxygen isotopes are found to be higher than the direct estimations at low wind
speed (<5 m s−1) and lower at high wind speeds (>13 m s−1) and showed significant spatial variability. The method presented here can be used to derive seasonal and spatial variations
in k and the influence of surface conditions on the value, leading to improved estimates of biogenic/anthropogenic gas exchange
at the air-sea interface. |
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