摘要
通过对“我国西北干旱区陆-气相互作用试验”强化观测期(IOP)在甘肃敦煌取得的资料合理筛选以后,探讨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(感热和水汽粗糙度)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小一个量级,并且随摩擦速度的增大而减小,但明显比理论预测值要大。
The parameterization of surface turbulent fluxes over Gobi in ar-id region is researched by using rationally-screened observational data. First-ly, characteristics of Monin-Obukhov similarity functions are analyzed andtheir empirical formulae are fitted. The results show that fitted curves of simi-larity functions of wind speed and temperature with stability parameter differlittle from the typical empirical curves and are within the ranges of scatter ofthe empirical curves, but their values in neutral condition are different to someextent. Meanwhile, average values of momentum and scalar (sensible heatand water vapor) roughness lengths as well as changes of scalar roughnesslengths with friction velocity are given out by utilizing the data. It is found thatthe mean values of scalar roughness lengths are about one order smaller thanthat of momentum roughness lengh and decrease with increase of friction ve-focity, but they are evidently larger than their theoretically forecasted values.
出处
《科学技术与工程》
2003年第1期30-39,共10页
Science Technology and Engineering
基金
国家自然科学基金(40175004)
国家重点基础研究发展规化项目(G1998040904)
