Citation: | Zang Jiaye. Dissolved methane in sea water of the East China Sea[J]. Haiyang Xuebao, 1998, 20(2): 52-59. |
Based on our investigated data for the East China Sea in autumn 1991,the paper discusses the dissolved methane distribution features,formation mechanism, and sources of methane in sea water in detail.In the surface water, the dissolved methane is supersaturation and the saturation is 127%-259%.Above the thermocline,the sectional distribution of methane is different from the nutrient's.The values of each station are almost similar to each other.It is not shown that the tongue shaped distribution under the influence of the Changjiang diluted water.There is the higher concentrations in the bottom water and it is shown that the methane diffuses rapidly into the water from the sediments on the continental shelf.The upwelled process of the Kuroshio subsurface water dilutes the methane concentration in the bottom water on the shelf.The methane vertical profiles show various distributions on the shelf and open ocean.The former is mainly controlled by the physical mixing process.The later shows the open oceanic feature.There is the subsurface methane maximum around the thermocline.It is possible that the bottom water with higher methane on the shelf is transported along the isopycnal surface.
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