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白令海BR断面海-气CO2通量及其参数特征

, PP. 85-92

Keywords: 白令海,白令陆坡流,海-气CO2通量,溶解总无机碳,总碱度

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Abstract:

通过对2008年夏季白令海大气和海水pCO2连续观测资料,结合BR断面上站位水体垂直采样测量,对白令海不同海区pCO2的分布特征及其与理化参数的关系进行了初步研究,结果表明,将白令海划分为4个具有不同CO2吸收能力的海区,其中陆坡流区碳通量高达-18.72mmol/(m2·d),是海盆北区的近2倍,比海盆南区高一个量级;在海盆北区和陆坡流区pCO2随温度升高而增加,两者之间呈正相关关系,而在海盆南区和陆架区两者的关系不明显,表明这两个海区的温度可能不是pCO2变化的主要调控因子;在海盆北区与陆架区pCO2与盐度呈显著的相关,这很可能受到水团混合的影响,而在海盆南区与陆坡流区两者的变化幅度比较小,关系也不显著。在海盆南区有充分混合的高温、高盐、高溶解总无机碳(DIC)和高总碱度(TA)的水体,这是导致该海区CO2吸收能力最弱的主要原因。在陆坡流区与此相反,呈现出低温、低盐、低TA和低DIC的水体特征,明显不同于白令海盆或白令海陆架区,这可能是形成表层海水pCO2低值的主要原因。

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