东海表层水二氧化碳及其海气通量

Carbon dioxide in surface water and its flux in East China Sea

1994年春、秋季在东海进行了两个航次的调查，采用气相色谱法和CO2采样系统测定了表层水和大气CO2分压。结呆表明，东海大部分海区CO2处于不饱和状态，可视为大气CO2的汇点。东海陆采区表层水CO2分压呈明显的季节变化趋势，即春季近岸低，大洋高；秋季西北部高，大洋低。黑潮区表层水CO2分压较低，无明显的季节性变化。利用通量模式，估算了大气输入东海海域的CO2通量为45.1g／(m2·a）。

Pco2 in surface water and atmosphere was determined by using gas chromatographic analysis and CO2, sampling system in spring and autumn of 1994, the results of CO2 measurements indicate: CO2 in the surface water was markedly undersaturated in the most area of the East China Sea, which served as a sink for atmospheric CO2. The Pco2 values in the surface water of the continental shelf zone appeared to be of seasonal variation, Pco2 was lower in the coastal sea than in the open sea in spring, but higher in the coastal sea than the open sea in autumn. Pco2 in the surface water of the Kuroshio region was generally low, and did not show a significant seasonal variation. The net CO2 flux in the East China Sea was estimated by using flux model and the annual CO2 flux from atmosphere into sea water was about 45. 1 g/(m2. a).