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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。
In this paper, precipitation and drought characteristics in the western region of Jilin Province (Baicheng area) were analyzed from 1950 to 1990. The results show that less rainfall, greater variability of precipitation and uneven seasonal distribution are the main causes of drought in this area. Since the 1970s, the drought in the area has been aggravating. The frequency of drought in spring and autumn has been increasing. However, the number of droughts in the 1980s has been reduced, but the 1989 large-scale drought in the whole region has emerged. Looking at the arid conditions in this area, the local drought occurs almost annually, and the geographical distribution of seasonal drought is obvious. Drought is the main climatic feature in the area.