中文摘要：

为进一步认识青藏高原山地低层风场特征、长期变化规律,利用2008-2012年青藏高原东南缘云南大理站边界层铁塔和风廓线雷达的长期观测资料,初步分析了该地区低层风场垂直结构及其变化特征。结果表明：（1）从地面到高空,风速、风向频率分布随高度的增加而变化,2~400m高度风速基本为2级,盛行风向为偏东风,这说明边界层铁塔和风廓线雷达的风速、风向具有连续性。（2）从垂直高度上看,风速存在明显季节变化特征,冬季风速较大,夏季风速较小;日变化结构随高度的升高表现形式明显不同,20m以下为单峰型,100~1500m为双峰型,2000m以上日变化不明显;平均风速逐月变化,20m以下为单峰型,100~1000m为双峰型,1500m以上为单峰型。（3）纬向风600m以下出现东西风交替的日变化,经向风在2~20m高度全天为南风,100m高度以上午后至日落为南风、其余时段为北风,南风由高空向低层传递。

英文摘要：

In order to further understanding long-term variation of low-level wind field over the mountains region of the Qinghai-Xizang Plateau,based on the observational data of boundary layer tower and wind profile radar in Dali region of the southeastern margin of the Qinghai-Xizang Plateau from 2008 to 2012,the vertical structure and variation characteristics of wind field were analyzed.The results show as follow：Firstly,wind speed and wind direction frequency in the low-level atmosphere varied with height.Wind force scale was 2 level and prevailing winds were east winds between 2 m and 400 m height.It indicated that wind speed and wind direction measured with boundary layer tower and wind profile radar was continuous.Secondly,vertical wind speed changed with season,which its value was greater in winter than that in summer.The diurnal variations of wind speed at different height were different,that is to say,the diurnal variations of wind speed displayed one peak below 20 m and two speaks between 100 m and 1500 m height,and were not evident above 2000 m height.The monthly variations of wind speed showed one speak below 20 m and above 1500 m height,and showed two speaks between 100 m and 1000 m height.Finally,the zonal winds below 600 m height appeared a daily cycle of east wind and west wind.The meridional winds were south winds all the day between 2 m and 20 m height,and were south winds from afternoon to sunset and north winds form night to next morning above 100 m height.