春季北黄海表层海水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 Spring

依据2007年4~5月在北黄海走航连续观测所得pCO2数据,结合水文、化学、生物等要素的同步观测资料,对该海域pCO2的分布特征及其影响因素进行了探讨。调查结果表明:春季北黄海表层海水pCO2测得值在335~495μatm之间,统计平均值为393μatm,其中黄海混合水海域由于受生物活动、碳酸盐体系和温跃层等因素共同作用为大气CO2的汇区;辽南沿岸大部分海域由于受生物活动影响为汇区;而山东半岛北岸受渤海沿岸水输入影响的泥沙沉积区、成山角冷水涌升区及西朝鲜冷水海域为大气CO2的源区。

Distribution and controlling factors of surface seawater partial pressure of CO2(pCO2) were determined in the northern Yellow Sea during spring based on the data obtained by using continuous underway measurements of pCO2 and the cogredient data of hydrology,chemistry and biology from April to May in 2007.The results showed that in spring the pCO2 ranged from 335 μatm to 495 μatm,with a statistical average value of 394 μatm.The coastal area north of Shandong Peninsula,where sand deposits due to the input of Bohai Sea coastal water,was a source of atmospheric CO2,and the coastal area near Chengshanjiao was also a source because of the upwelling of the bottom cold water.Besides,the area affected by the Western Korea Cold waters acted as an atmospheric CO2 source.pCO2 was undersaturated with respect to the atmospheric CO2 in the area of Yellow Sea Mixed waters owing to the combination of water stratification and biological activity,and most part of the Liaonan Coastal area was also undersaturated.