青藏高原纳木错湖区大气边界层结构分析

Study on Characteristic of Atmospheric Boundary Layer over Lake Namco Region,Tibetan Plateau

利用2007年8月8～19日期间系留气球低探空和GPS无线电探空资料，分析了纳木错湖区大气边界层高度、风、温、湿等要素的垂直结构。结果表明：纳木错湖的冷湖效应推迟了边界层湍流混合及对流边界层出现的时间，边界层高度日变化非常明显，对流边界层高度最高可达1750m；在晴天条件下，边界层内湖陆风日变化非常明显，湖陆风控制范围常超过边界层高度，可达对流层中部；边界层内比湿变化呈V型变化，白天减小，夜间增大，早晨08：00出现峰值。

Using the radio-sounding and tether-sonde data from August 8 to 19, 2007, the characteristics of atmospheric boundary layer height, wind, temperature, specific humidity and other elements of the vertical structure over the Namco Lake area of the Tibetan Plateau are analyzed. The results show that： The cold lake in Namco lake effect postponed the time of the convective boundary layer. The diurnal variation of boundary layer height is very obvious. The convective boundary layer height is up to 1750 m in sunny condition. Obviously, the region dominated lake breeze exceed boundary layer height, and even the middle troposphere. The specific humidity has V-type change, it is decreased during the day and increased at night, and it reaches peak at 08：00.