Decrease of Arctic Sea Ice and Its Relationship with the Sea Surface Pressure and Temperature in High Latitude

Using the Arctic sea\|ice data during the period 1953\_1998, the sea level pressure in North Hemisphere, and the temperature in 22 stations of North\|East China, we analyzed interannual and decadal climatic changes with statistical method. The results are as follws: (1) Obvious reduce of the sea\|ice extent was appeared in high latitude. In latitude band to the north of 60°N, the variance of the tendency term is larger then 50% of total variance, and larger than period variation. (2) Since 1990, the sea\|ice extent decrease was suddenly appeared in the Barents Sea, Greenland Sea, Lablador Sea and to the north of 50°N. The Arctic sea ice is very sensitivity to climatic variation of the warm in the world. (3) There exist period variation about 11～15 years in the high latitude ocean, but the sea ice decrease trend is dominant scale. The variance of decrease tend is larger than the period variation in he high latitude ocean, therefor the sea\|ice extent decrease is main character in sea\|ice variation during the 46 years. (4) The variance tend of the SLP to the north of 40°N was decreased. The obvious reduce was appeared with AO index. There exist a significance deference since 1990. (5) Corresponding to the SLP decrease, the temperature evidently increases in North\|East China. (6) The Arctic Oscillation has an effect on the sea\|ice extent in the Barents Sea, Greenland Sea, Lablador Sea, and the temperature in North\|East China. When the Arctic Oscillation is stronger than normal, the sea\|ice extent in the Barents Sea and Greenland Sea will be larger, the sea\|ice extent in Lablador Sea will be smaller than normal, the temperature in North\|East China will obviously be decreased.