戈壁荒漠上大气稳定度分类方法探讨和大气湍流变化特征

A research of atmospheric stability classification scheme and the characteristics of atmospheric turbulence variation in the gobi desert

为了研究戈壁荒漠上大气扩散规律和边界层结构。根据气象铁塔常规气象观测和湍流观测的结果，分析戈壁荒漠大气边界层温度梯度和湍流变化的一些特征。分析结果表明，同其它下垫面相比温度梯度日变化大，与风速的关系较为奇特。采用通常Ｐ─Ｔ分类标准直接应用该地区作大气稳定度分类，与实际情况有较大误差，须经适当修改后才能使用。湍流统计量的日夜变化强，表明戈壁荒漠下垫面的热力作用对湍流混合的助长和抑制。这些特征为进一步分析戈壁荒漠上大气边界层结构和大气扩散研究提供了依据。

In order to study the atmospheric diffusion and boundary layer structure in the gobi desert,according to normal meteorological measurement and turbulence measurement from 100m tower,some characteristics of temperature gradient and turbulence variation of atmospheric boundary layer are analyzed,showing that the daily variation of temperature gradient is stronger,and its relation with the wind speed at 10m height is abnormal，compared with other underlying surface.The normal Pasquill-Turner scheme can not be used directly in the area, unless it is suitably revised. The stronger turbulence statistic variation means that thermodynamic action of the underlying surface reinforces or restrains the atmospheric turbulence mixing. These results provide scientific basis for further analyzing the turbulence structure and atmospheric diffusion in the gobi desert.