东疆大风的统计分析

Statistical Analysis of the Gale in Eastern Xinjiang

对1961—2000年东疆地区6站大风天气过程进行统计分析结果表明,东疆地区百里风区和三塘湖至淖毛湖之间大风最为频繁,年平均日数大于90d,高发中心在七角井,其次为淖毛湖和伊吾县,年平均日数30～40d,巴里坤盆地为最少;大风天气的次数和持续时间均有减少的趋势,这可能与近年来造林防风取得的成效有关;春夏之间(4—6月)易出现大风天气;大风持续时间在半小时以内的大风概率最大,超过半小时随时间的增长概率减小。

Based on the statistical analysis of the gale weather process occurred at six station in eastern Xinjiang from 1961 to 2000, the results show that the most frequent occurred regions are Hundred-Li Wind Region and between Santanghu and Naomaohu, in which the annual average number of gale day are more than 90d, and the high occurrence center is Qijiaojing; the more frequent occurred regions are Naomaohu and Yiwu, which the annual average number of gale day are more than 30-40 d; the least occurrence region is Balikun basin. The gale weather number of times and its duration exist the decreasing trend, this maybe have the relationship to forest planting in recent years. Gales are often occurring in late spring to early summer （from April to June）. The most probability of the gale duration is within 30 minutes, and exceeds 30 minutes, the probability to be decreasing with the growth of the gale duration.