Variations of Arctic sea-ice in four sectors and their ralations with autumn temperature in China are studied in this paper by use of the monthly 1°× 1° sea-ice concentration data of Hadley center from January 1953 to February 2003 and the monthly temperature data at 160 stations in China.

Based on the Hadlley Centre Arctic sea-ice data for the period 1968~2000,it is found that the decrease tendency of the Arctic sea-ice in the North Hemisphere is very obvious.

Based on sandstorm records in Ningxia,Arctic sea-ice concentration data and 500,850hPa height and wind fields from NCEP/NCAR reanalysis dataset,the variations of sandstorm are investigated.

Thermodynamics Parameter Identification and Numerical Simulation in Arctic Sea Ice Temperature Field;

5° 500 hPa heights and the Arctic 1°×1° sea ice data,the indices for the polar vortex area and intensity,and the Arctic sea ice area are calculated,and their longitudinal distributions,and periodicity and the sudden changes of long term trends are analyzed to reveal their intrinsic relationships.

The Winton s enthalpy conservation three-layer thermodynamic model has been used in this paper to replace the zero-layer one in the Hibler thermodynamic-dynamic sea ice model,and the 1983 Arctic sea ice has been simulated using the Hibler and the improved Hibler model.