Uptake mechanism of anthropogenic CO2 in the Kuroshio Extension region in an ocean general circulation model

作者：Nakano Hideyuki^*; Tsujino Hiroyuki; Hirabara Mikitoshi; Yasuda Tamaki; Motoi Tatsuo; Ishii Masao; Yamanaka Goro

来源：Journal of Oceanography, 2011, 67(6): 765-783.

DOI：10.1007/s10872-011-0075-7

• Uptake of anthropogenic CO2
• OGCM

The uptake mechanism of anthropogenic CO2 in 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 CO2 is caused mainly by the increase of pCO(2) dependency 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 CO2 concentration, is comparatively small. Winter uptake of anthropogenic CO2 increases with the rise of the atmospheric CO2 level, 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 increased pCO(2) dependency of the sea water on the temperature and the seasonal difference in cooling.

• 出版日期2011-12
• 单位中国气象科学研究院