南印度洋海—气二氧化碳分压差及其通量

Differences of CO2 partial pressure between sea-air and its flux in South Indian Ocean

本文研究了第八次中国南极科学考察中在普里兹湾附近的南印度洋考察区所观测到的海-气二氧化碳分压资料，结果表明：研究区海-气二氧化碳分压差值Δp在—24.5～2.4Pa之间，平均为—3.8lPa，除西北部有一小块狭长的Δp＞0的区域外，其余部分Δp＜0，因此，总体上研究区海域是大气二氧化碳的汇区，其碳通量平均为－310．0mg／（m2·d），在南极的夏半年，约能吸收1Gt的大气CO2。在研究区83°E以西海域，Δp大致是西北高东南低、普里兹湾最低的分布趋势，在此线以东，则呈块状分布。研究区的Δp与环流、水温、磷酸盐和叶绿素a的分布有很好的相关性。

The CO2 differences (Δp) between Pco2), in the surface seawater and pco2 in the atmo-sphere were determined on the area of the South Indian Ocean during the Eighth ChineseAntarctic Research Expedition, The results of survey indicated that the Δp in the researcharea was -24.5 to 2. 4 Pa and the mean Δp values were -3. 81 Pa. Except a narrow andlong area with Δp>0 in the northwest part Δp value was smaller than zero in all the otherarea3. The research area as a whole serves as a sink for atmospheric CO2,the mean CO2 fluxesfrom atmosphere into sea water being about 297. 81mg/(m2·d),and takes up about l GtCO2 of atmosphere in summer in the Antarctica. In the area to the west of 83°E,Δp in thenorthwest was higher than in the southwest,and the lowest in the PRYDZ Bay,and in to theeast of 83°E,the distribution of Δp was in patches. Δp in the research area was significantlycorrelated with circulation,temperature,phosphate and Chl-a.