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首页> 外文期刊>大气科学进展（英文版） >荒漠戈壁下垫面表面动量和感热湍流通量参数化研究
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荒漠戈壁下垫面表面动量和感热湍流通量参数化研究

机译：荒漠戈壁下垫面表面动量和感热湍流通量参数化研究

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摘要

用合理筛选以后的野外观测资料,研究了荒漠戈壁地表湍流通量参数化的问题.首先,分析了Monin-Obukhov相似函数的特征,并拟合出了其经验公式.结果表明,风速和温度相似性函数随稳定度参数的变化曲线与典型经验曲线差异较小,并且在经验曲线分布范围以内,但中性时的值有所不同.同时,还用该资料给出了动量和标量粗糙度(感热粗糙度)长度的平均值及其标量粗糙度随摩擦速度的变化关系.发现标量粗糙度的平均值大约比动量粗糙度的小一个量级,并且随摩擦速度的增大而减小,但明显比其理论预测值要大.%The parameterization of surface turbulent fluxes over the Gobi Desert in arid regions is studied by usingrationally screened observational data. First, the characteristics of Monin-Obukhov similarity functionsare analyzed and their empirical formulae are fitted. The results show that fitted curves of changes ofsimilarity functions of wind speed and temperature with stability parameter differ little from the typicalempirical curves and are within the ranges of scatter of the empirical curves, but their values in the neutralcondition are different from the typical values to some extent. Furthermore, average values of momentumand scalar (sensible heat) roughness lengths as well as changes of scalar roughness length with frictionvelocity are determined by utilizing the data. It is found that the average values of scalar roughness lengthare about one order smaller than that of the momentum roughness length and decrease with increasingfriction velocity, but they are evidently larger than their theoretically forecasted values.
机译：用合理筛选以后的野外观测资料,研究了荒漠戈壁地表湍流通量参数化的问题.首先,分析了Monin-Obukhov相似函数的特征,并拟合出了其经验公式.结果表明,风速和温度相似性函数随稳定度参数的变化曲线与典型经验曲线差异较小,并且在经验曲线分布范围以内,但中性时的值有所不同.同时,还用该资料给出了动量和标量粗糙度(感热粗糙度)长度的平均值及其标量粗糙度随摩擦速度的变化关系.发现标量粗糙度的平均值大约比动量粗糙度的小一个量级,并且随摩擦速度的增大而减小,但明显比其理论预测值要大.%The parameterization of surface turbulent fluxes over the Gobi Desert in arid regions is studied by usingrationally screened observational data. First, the characteristics of Monin-Obukhov similarity functionsare analyzed and their empirical formulae are fitted. The results show that fitted curves of changes ofsimilarity functions of wind speed and temperature with stability parameter differ little from the typicalempirical curves and are within the ranges of scatter of the empirical curves, but their values in the neutralcondition are different from the typical values to some extent. Furthermore, average values of momentumand scalar (sensible heat) roughness lengths as well as changes of scalar roughness length with frictionvelocity are determined by utilizing the data. It is found that the average values of scalar roughness lengthare about one order smaller than that of the momentum roughness length and decrease with increasingfriction velocity, but they are evidently larger than their theoretically forecasted values.

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