南极海冰对大气环流及长江上游水量的影响

Impact of the Variation of Antarctic Sea-ice Extent on Atmospheric Circulation and Runoff for the Upper Yangtze River

本文利用相关分析方法揭示了南极海冰面积变动与大气环流及长江上游水量变化之间的联系,并对这种联系发生的过程作了初步探讨。结果表明,南极海冰面积变动能够改变南印度洋纬向环流强度,并影响赤道西印度洋海温,进而影响印缅地区500hPa位势高度场。分析发现,2～3月南极海冰面积与8～9月长江上游水量有一定联系,这对于探讨长江上游水量变化的物理背景及长期水文预报有一定意义.

The connections of atmospheric circulation and runoff for the upper Yangtze River with the variation of Antarctic sea-ice extent are discussed by using correlation analysis in this paper. The processes associated with these connections are also analysed. It follows from the analysis that the variation of Antarctic sea-ice extent can change the intensity of zonal circulation in south Indian Ocean and affect the SST (sea surface temperature) at equatorial west Indian Ocean, and further, affect the 500hPa height distribution over the region between India and Burma. It also shows that there are some connections between the Antarctic sea-ice extent in Feb. to Mar. and runoff for the upper Yangtze River in Aug. to Sep., which could be useful for revealing the physical background that affects the variation of runoff for the upper Yangtze River.