秋季北黄海表层海水CO_2分压分布及其影响因素探讨

Distribution and Controlling Factors of Surface Seawater Partial Pressure of CO_2 in the Northern Yellow Sea During Autumn

根据2007年10月在北黄海走航连续观测所得pCO2数据,结合水文、化学和生物等要素的同步观测资料,对该海域pCO2分布及其影响因素进行了探讨。结果表明：秋季北黄海表层海水pCO2值在354-435μatm之间,统计平均值为395μatm。受河流输入影响的辽南沿岸流区域,山东半岛以北沿岸受渤海沿岸水输入影响的泥沙沉积区,是大气CO2的源区;在北黄海中部,黄海混合水范围内,由于强烈的生物活动,形成了较大范围的大气CO2汇区;而黄海混合水的其他区域仍然是大气CO2的源。总体来说,秋季北黄海表现出大气CO2弱源的性质。

Distribution and controlling factors of surface seawater partial pressure of CO2 （pCO2） were determined in the Northern Yellow Sea during the autumn based on the data obtained by using continuous underway measurements of pCO2 and related parameters in hydrology, chemistry and biology in October 2007. The results showed that in autumn the pCO2 ranged from 354 μatm to 435 μatm, with an average of 395 μatm. The Liaonan coastal area acted as a source of atmospheric CO2. But in the coastal area north of Shandong Peninsula, both sources and sinks of the atmospheric CO2 exist the p CO2 was oversaturated in the area strongly influenced by the input of Bohai Sea coastal water and terrestrial materials, whereas it was undersaturated in the area with strong biological activity. Because of the strong biological activity, the central region occupied with the Yellow Sea mixing water acted as a large sink of atmospheric CO2 during the autumn. On the whole, the Northern Yellow Sea acted as a weak source of atmospheric CO2 during the autumn.