吉林省西部地区干旱特征分析

本文用1950～1990年降水资科分析了吉林省西部地区(白城地区)的降水及干旱特征。结果表明:降水量少、降水变率大和季节分布不均,是导致这一地区干旱的主要原因。70年代以来,该地区干旱趋于严重,春、秋旱中的大旱频率增加,进入80年代干旱有所减少,但却出现了1989年的全区性大范围干旱。综观这一地区的干旱情况,局部性干旱近乎年年发生,季节性干旱的地域分布十分明显。干旱是该区的主要气候特征。

AN ANALYSIS OF DRY CLIMATOLOGICAL FEATURE IN THE WEST OF JILIN PROVINCE

The climatogical data during 1950-1990 are used to analyse the rain- fall and dry climatogical characteristics in the west(Baicheng prefecture) of Jilin province.The statistical analysis indicated that main reason causing the drought are less precipitation,more variable ratio of preci- titation and not well-distributed rainfall in this prefecture.During 1970s the drought tended to be serious,and the frequency of acute spring drought and autumn drought increased.In the 1980s,drought was less serious than in the 1970s,but the most serious drought did happen over this pre- ecture in 1989.Of this prefecture,in some areas drought happens nearly every year,and season drought occures in the limited region.Drought is the major climatic characteristics in the west of Jilin province.