Abstract:

The variations of the Antarctic sea-ice in each sea region are obviously different. This kind of different variations in each region may have different influence on a regional atmospheric circulation and further on global climate system. This study investigates that the relationship between variations of sea ice in the Ross Sea and Weddell Sea and the synoptic variations during summer in China using Northern Hemisphere monthly mean 500 hPa and 100 hPa geopotential and rainfall and temperature data at 160 stations in China. The results indicate that the sea ice variations in Ross Sea and Weddell Sea are both of indicative significance for the synoptic climate in summer of China. Ross Sea region is the crucial region where its proceeding sea ice variations in September show significant relation with the following June rainfall in Northeast China. If the sea ice of this crucial region in September is in heavy ice condition, the precipitation in Northeast China in the next June tends to be deficit. Weddell Sea region is the key region for summer temperature in Northeast China. If the sea ice of this key region in September is in light ice condition, the next June temperature in Northeast China also tends to be deficit.