中文摘要：

为了解敦煌戈壁地区近地层风向、风速的变化特征,利用2002-2008年＂敦煌试验＂在戈壁的微气象观测资料,分析了西北极端干旱的戈壁地区风向、风速的概率分布特点和日变化、年变化、年际变化的特征。结果表明：（1）该地区多为东、西风,威布尔分布能很好地拟合风速频率分布。（2）风向有明显的日变化,白天多为东风,晚上多为南风;风速有较明显的日变化,白天风速较大,夜晚风速较小。（3）风向有明显的年变化,夏季多为东北风,冬季多为西南风;风速的年变化明显,4月最大,1月最小。（4）风向没有明显的年际变化,每年各个方向出现的频率大致相同;风速有较弱逐年递减的年际变化趋势。

英文摘要：

In order to understand the variation characteristics of wind in Dunhuang gobi,using the micrometeorology data from the Dunhuang Experiment carried out during the period from 2002 to 2008,the characteristics of the probability distribution of wind direction and speed in the northwest arid region have been analyzed.The diurnal,annual and interannual change features of wind direction and speed have also been analyzed.The results indicate that：（1） In this region,the prevailing wind direction is east and west,the wind speed can be fitted well by Weibull distraction mode.（2） The wind direction and speed have obvious diural changes,the prevailing wind direction is east in daytime and south at night time,and the wind speed is higher in daytime than at night time.（3） Their annual variations are also apparent.The prevailing wind direction is north-east in summer and south in winter.Annual variation of wind speed is significant,in April the largest and the smallest in January.（4） The wind direction has no obvious interannual change,and they are almost the same in each year.Wind speed has a weak diminishing interannual trend.