近30年新疆降水量及雨日的变化特征分析

利用新疆1971-2006年98个气象站的逐日降水资料,研究了新疆年和四季降水量及雨日的气候变化特征。结果表明：新疆多年平均年降水量及雨日的空间分布均为北疆大于南疆,山区大于平原,二者长期变化的空间分布相似程度较低,有些地区甚至完全相反。南疆大部地区降水量的增加主要是由于雨日增加而造成的;北疆大部地区降水量的增加主要是...

Variation of precipitation and rain days in Xinjiang in recent 30 years

Changes of rain days and the spatial/ temporal features of annual and seasonal rain days in Xinjiang were investigated in the context of the observational data at 98 stations in the period of 1971-2006.It was pointed out that the annual precipitation and the rain days in the north part of Xinjiang were more than that in the south part and the mountainous area were more than the plain.The secular trend variation of rain days did not completely accord with that of precipitation.The precipitation increases in the south part of Xinjiang resulted from the increase of the rain days.The precipitation increases in the north part of Xinjiang resulted from the enhance of the rainfall intensity.The precipitation intensity in Tushantuo basin was weakening.The temporal trends of seasonal precipitation were all positive,especially in summer and winter in the north part of Xinjiang.The stations taking on positive trends distributed in the south part of Xinjiang and the station with negative trends distributed in the north part of Xinjiang.Other than sprint,the positive trend in the north part of Xinjiang and thenegative trend in the south part of Xinjiang were notable.The secular trend variation of rain days did not completely accord with that of precipitation,and in some place the features were the other way round.Form 1980s the precipitation in the north part of Xinjiang was distinctly increase,it was a sudden change.