Uptake mechanism of anthropogenic CO2 in the Kuroshio Extension region in an ocean general circulation model
Uptake mechanism of anthropogenic CO2 in the Kuroshio Extension region in an ocean general circulation model
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DOI：
10.1007/s10872-011-0075-7
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发表时间：
2011-10
影响因子：
2.3
通讯作者：
H. Nakano;H. Tsujino;Mikitoshi Hirabara;T. Yasuda;T. Motoi;M. Ishii;G. Yamanaka
中科院分区：
文献类型：
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作者：
H. Nakano;H. Tsujino;Mikitoshi Hirabara;T. Yasuda;T. Motoi;M. Ishii;G. Yamanaka
利用嵌入海洋环流模型的生物地球化学模型，通过拉格朗日方法研究了黑潮延伸区人为二氧化碳的吸收机制。研究发现，人为CO2的吸收主要是由于海水对温度的pCO2依赖性增加所致，这是由于现代国家溶解无机碳浓度高于工业化前国家造成的。与之前的研究观点相反，垂直夹带的影响相对较小，垂直夹带使最后一次与大气接触的水体具有过去较低的二氧化碳浓度。冬季人为CO2吸收量随着大气CO2浓度的升高而增加，而夏季吸收量相对稳定，导致吸收量的季节周期较大。这一增长非常显着，尤其是在黑潮延伸地区。新近提出，黑潮延伸区的这种增加主要是由于海水对温度的pCO2依赖性增加和冷却季节差异的综合影响造成的。
The uptake mechanism of anthropogenic CO2in the Kuroshio Extension is examined by a Lagrangian approach using a biogeochemical model embedded in an ocean general circulation model. It is found that the uptake of anthropogenic CO2is caused mainly by the increase ofpCO2dependency of seawater on temperature, which is caused by greater dissolved inorganic carbon concentration in the modern state than in the pre-industrial state. In contrast with the view of previous studies, the effect of the vertical entrainment, which brings waters that last contacted the atmosphere with the past lower CO2concentration, is comparatively small. Winter uptake of anthropogenic CO2increases with the rise of the atmospheric CO2level, while summer uptake is relatively stable, resulting in a larger seasonal cycle of the uptake. This increase is significant, especially in the Kuroshio Extension region. It is newly suggested that this increase in the Kuroshio Extension region is largely caused by the combined effects of the increasedpCO2dependency of the sea water on the temperature and the seasonal difference in cooling.