IMPACTS OF CLIMATE WARMING ON THERMAL AND MOISTURE CONDITIONS IN NORTHEAST CHINA IN RECENT 20 YEARS

The characteristics of climate warming, instability and extreme climate events as well as changes in atmospheric moisture and the corresponding thermal and moisture conditions in Northeast China in recent 20 years are analyzed based on data in 1961-2001 in 56 meteorological stations.The results show :(1) The temperature increment amplitude in winter is significant; the 1990's climate warming is stronger than the 1980's; and the increment in the southern part is larger than that in the northern part.(2) The temperature increment in summer is limited; the temperature variance is unstable, and extreme climate events such as days of high temperature occur frequently.(3) The increment in minimum temperature is much larger than that in maximum temperature, which results in the reduction of temperature diurnal range; the change is more obvious in winter.(4) There is no significant change in atmospheric moisture deficit and the corresponding thermal and moisture conditions at 10-year scale; however, there are evidences of warming and drying in recent 5 years and the warming and drying periods occur frequently in summer as well as in the southern and western parts.Warming and drying in summer is unfavorable to crops.