A preliminary study of carbon system in the East China Sea
A preliminary study of carbon system in the East China Sea
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DOI：
10.1007/bf02700744
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发表时间：
1997-02
影响因子：
2.3
通讯作者：
S. Tsunogai;S. Watanabe;J. Nakamura;T. Ono;Tetsuro Sato
中科院分区：
文献类型：
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作者：
S. Tsunogai;S. Watanabe;J. Nakamura;T. Ono;Tetsuro Sato
1993年冬、秋季对东海中部表层水CO2活度、总碳酸盐、pH和碱度进行了测定。陆架海水中CO2的活度比地表空气低约50 ppm。如果这一比率适用于整个沿海海域，则这一减少相当于沿海地区吸收大气CO2约40 gC/m2/yr，或全球大陆架吸收1 GtC/yr。标准化总碳酸盐含量在近岸和近底水域较高。这种向底部的增加可能是由于沉积在底部的有机物质。这一结论得到了pH值分布的支持。标准化碱度分布也显示，近海岸水体中的值较高，但在地表水中，这表明碳酸氢盐的供应来自河水。根据过量碱度和碱度输入计算，包括黄海在内的东海水的停留时间约为0.8年。利用这一停留时间和过量碳酸盐，我们可以估计，从沿海区向海洋盆地输送的溶解碳酸盐量约为70 gC/m2/yr或2 GtC/yr/全球大陆架面积。这也意味着河流向海洋输送碳的速率为30 gC/m2/年的沿海海洋或0.8 GtC/年/全球大陆架面积，碳由溶解的无机碳酸盐和大陆架上分解的陆地有机碳组成。
In the central part of the East China Sea, the activity of CO2in the surface water and total carbonate, pH and alkalinity in the water column were determined in winter and autumn of 1993. The activity of CO2in the continental shelf water was about 50 ppm lower than that of surface air. This decrease corresponds to the absorption of about 40 gC/m2/yr of atmospheric CO2in the coastal zone or 1 GtC/yr in the global continental shelf, if this rate is applicable to entire coastal seas. The normalized total carbonate contents were higher in the water near the coast and near the bottom. This increase toward the bottom may be due to the organic matter deposited on the bottom. This conclusion is supported by the distribution of pH. The normalized alkalinity distribution also showed higher values in the near-coast water, but in the surface water, indicating the supply of bicarbonate from river water. The residence time of the East China Sea water, including the Yellow Sea water, has been calculated to be about 0.8 yr from the excess alkalinity and the alkalinity input. Using this residence time and the excess carbonate, we can estimate that the amount of dissolved carbonate transported from the coastal zone to the oceanic basin is about 70 gC/m2/yr or 2 GtC/yr/area-of-global-continental-shelf. This also means that the rivers transport carbon to the oceans at a rate of 30 gC/m2/yr of the coastal sea or 0.8 GtC/yr/ area-of-global shelf, the carbon consisting of dissolved inorganic carbonate and terrestrial organic carbon decomposed on the continental shelf.