O2 Flux across the Sea-Air Interface

DO variation with time indicates that, at station 13 and the upper 20 m of station 20, its concentrations were significantly 6.0 mg/L except for a very few cases, and measured up to Chinese seawater quality grade I at the 2 m above the bottom layer of station 20, its concentrations only measmed up to Chinese seawater quality grade 111. 

The water-air O2 flux F, g/(m d)) in the Changjiang River Estuary was calculated as follows  

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Song JM, Zhan BQ, Li PC (1997b) Dissolved oxygen distribution and O2 fluxes across the sea-air interface in the East China Sea waters. Chin J Oceanol Limnol 14(4) 228-232... 

Fig. 4.60 (Song et al., 1996) shows the daily variation of O2 flux across the sea-air interface at the continuous stations 410 and 111. It can be seen that oxygen released to air was the main process in one day and night, and that the amount released in daytime was more than that at night. This was because photosynthesis produced more oxygen in daytime, and the high temperature of seawater also increased the release of oxygen. This feature was very obvious in Leg 9410. At station 410, the oxygen in air dissolved into seawater from 18 00 to 06 00, but it was O2 from seawater to air from 06 00 to 18 00. The oxygen released into air was —8.63 L/(m d) in Leg 9404. This reflected the fact that the seawater was supersaturated and the photosynthesis was very...

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