Dissolved oxygen distribution and O2 fluxes across the sea-air interface in East China Sea waters |
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| Authors: | Song Jin-ming Zhan Bin-qiu Li Peng-cheng |
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| Institution: | (1) Institute of Oceanology, CAS, 266071 Qingdao |
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| Abstract: | This study on the sectional and vertical distribution of dissolved oxygen (DO) and the O2 fluxes across the sea-air interface in East China Sea (ESC) waters shows that the waters were in steady state and that the
difference of DO was great in upper and bottom waters in Apr. 1994; but that seawater mixing was strong and the difference
of DO was small in upper and bottom waters in Oct. 1994. The above conclusions were specially obvious in continental shelf
waters under 100 m. The DO maximum in subsurface layer waters appeared only at several stations and in general the DO in the
waters decreased with depth. The horizontal distributions of O2 fluxes across the sea-air interface appeared in stripes in Leg 9404 when most regions covered were supersaturated with O2 seawater to air flux was large, and that on section No. 1 was 1.594 L/m2·d. The horizontal distribution of O2 fluxes across the sea-air interface appeared lumpy in Leg 9410, when most regions covered were unsaturated with O2·O2 was dissolved from air to seawater, and the fluxes were 0.819 L/m2·d on section No. 1 in Leg 9310, 0.219 L/m2·d in Leg 9410. The main reasons for DO change in surface layer seawater were the mixture of upper and bottom layer water,
and the exchange of O2 across the sea-air interface. The variation of DO by biological activity was only 20% of total change of DO.
Contribution No. 2716 from Institute of Oceanology, Chinese Academy of Sciences. |
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| Keywords: | dissolved oxygen (DO) O2 fluxes across the sea-air interface East China Sea waters |
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