沙漠腹地春夏季近地层大气湍流特征观测分析

摘要/Abstract

摘要： 利用塔克拉玛干沙漠腹地近地层10 m高度处快速响应探测系统的湍流资料,分析了摩擦速度和特征温度的变化,并且对不同稳定层结条件下无因次速度分量方差和无因次温度方差的普适函数进行详细拟合。研究表明,摩擦速度和特征温度有明显的日变化特征,且摩擦速度的最大值出现在z/L=-0.2处;无因次速度方差在不稳定和稳定层结条件下均符合相似理论的次幂律,但如果考虑到相关性,最佳幂指数可有不同;近中性时则接近常数,并给出了具体数值。无因次温度方差则在夏季不稳定层结条件时符合-1/3次幂律。

关键词: 塔克拉玛干, 沙漠腹地, 近地层, 湍流

Abstract: The turbulent data obtained at the height of 10 m in the hinterland of Taklimakan desert were used to analyze the variation characteristics of the turbulent statistics such as wind speed, temperature, friction velocity and characteristic temperature, and to fit universal function in detail. The results are as follows: The friction velocity and characteristic temperature display obvious diurnal variation characteristic. The maximum value of friction velocity appears at z/L=-0.2. Under the unstable and stable conditions, the relations between desert hinterland surface layer dimensionless components of velocity variance and the stability follow the similarity theory power rules, considering the correlation the best power has the difference respectively. Under near neutral condition, three direction dimensionless components of velocity variance are approximate constants. Under the unstable conditions, the relations between dimensionless temperature variance and the stability follow the "law of -1/3 power".

Key words: Taklimakan desert, hinterland, surface layer, turbulent

中图分类号:

P425.2

缪启龙;温雅婷;何清;;李兰兰;王晶. 沙漠腹地春夏季近地层大气湍流特征观测分析[J]. 中国沙漠, 2010, 30(1): 167-174.

MIAO Qi-long;WEN Ya-ting;HE Qing;LI Lan-lan;WANG Jing. Turbulence Characteristics of Surface Layer over Hinterland of Taklimakan Desert in Spring and Summer[J]. JOURNAL OF DESERT RESEARCH, 2010, 30(1): 167-174.

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