近57年玉门年最多风向异常与气象灾害

应用1953～2009年历史资料,对玉门年最多风向变化进行分析,并对近57年玉门4次年最多风向异常的气象灾害进行了分析。结果表明,57年中,玉门年最多风向有51年为东风,有4年为西风,有2年为西风和东风出现频率一样多;年最多风向异常的4年是1961、1979、1987、1998年。年最多风向异常时,气象灾害严重。1961年甘肃省粮食总产量为近60年来历史最少,1961年前后严重的旱灾使甘肃近半数农业人口严重缺粮,人口死亡剧增,到1961年末甘肃人口比1958年减少近百万。1979年是近57年中玉门年降水量最多的一年。1987年6月11日的日降水量是近57年中玉门6月份日降水量最多的一年。1998年是近57年中玉门年平均气温最高的一年。

The Most Abnormal Wind Direction and Meteorological Disaster in Yumen in Recent 57 a

By using data during 1953-2009,the variation of the most direction in Yumen was analyzed,and 4 times meteorological disasters in recent 57 a were analyzed.The results showed that in 57 a,the most direction contain 51 a east wind,4 a west wind,2 a west wind and east wind in the same frequency;the most abnormal wind direction years were 1961,1979,1987 and 1998,in which have serve meteorological disasters.The total grain yield in Gansu Province in 1961 was the least in recent 60a,severe drought around 1961 made nearly half of the agricultural population lack of food,many people died.At the end of 1961,the population of Gansu reduced nearly million than 1958.1979 is the most annual precipitation year in recent 57 a.Daily precipitation on June 11th,1987 was the most day in recent 57 a in Yumen.And the annual mean temperature of 1998 was the highest in recent 57 a in Yumen.