南海东北部春季海表pCO2分布及海-气CO2通量

摘要

Relying on the Sharing Marine Research Plan in northeast part of the South China Sea supported by Na-tional Research Foundation in the spring of 2013,we measured pCO2 and corresponding parameters in surface water and air by underway measurement.Combined with the corresponding hydrological and biochemical data,we dis-cussed the distribution and variation of pCO2 .The results indicated that,effected by Pearl River diluted water and coastal upwelling and biological activity,offshore shelf areas presented an obvious sink of atmospheric CO2 ,while in Luzon Strait and northwest part of Luzon areas,effected by high temperatures and the intrusion of Kuroshio Cur-rent and Luzon upwelling,showed a strong source.In general,the northeast part of the South China Sea in spring add about 4.25×104 tons of carbon to atmosphere.%2013年南海东北部春季共享航次采用走航观测方式，现场测定了表层海水和大气的二氧化碳分压(pCO2)及相应参数。结合水文、化学等同步观测要素资料，对该海域pCO2的分布变化进行了探讨。结果表明，陆架区受珠江冲淡水、沿岸上升流及生物活动的影响，呈现CO2的强汇特征；吕宋海峡附近及吕宋岛西北附近海域受海表高温、黑潮分支“西伸”、吕宋岛西北海域上升流等因素影响，呈现强源特征。根据Wanninkhof的通量模式，春季整个南海东北部海域共向大气释放约4.25×104 t碳。