青藏高原珠峰绒布河谷地区近地层湍流输送特征  

Turbulent Characteristics of the Surface Layer in Rongbuk Valley on the Northern Slope of Mt. Qomolangma

作　　者：刘辉志[1] 冯健武[1] 邹捍[1] 李爱国[1] 

机构地区：[1]中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京100029

出　　处：《高原气象》2007年第6期1151-1161,共11页Plateau Meteorology

基　　金：中国科学院知识创新工程重要方向项目(KZCX3-SW-231)资助

摘　　要：利用2006年6月和2007年6月中国科学院HEST大气科学实验在珠峰绒布河谷地区获取的近地层湍流观测资料,分析了近地层湍流谱特征和方差统计特征,讨论了上下2层(2 m和8 m)基本气象要素和湍流通量的日变化特征。结果表明,珠峰地区湍流能谱基本上符合Monin-Obukov相似性理论在惯性副区的变化规律;由于山谷复杂地形和下垫面的影响,湍流方差统计值均小于高原其它地方;珠峰地区近地层感热通量白天下层大于上层,夜间相反;潜热通量一天内基本上上层大于下层。Field campaigns were carried out in June 2007 in Rongbuk valley on north side of Mount Qomolangma over Tibetan Plateau. The turbulent data have been measured at 2 m and 8 m above ground, together with temperature, humidity measurements. The variations of turbulent statistics parameters, differences of wind speed and temperature between 2 m and 8 m have been investigated. Both spectrum and co-spectrum appear to follow Monin-Obukov similarity and Kolmogorov＇s prediction for the inertial subrange. The standard deviations of temperature and humility fluctuation support Monin-Obukov similarity theory. In neutral condition, relations between non-dimenslonal wind speed components and z/L follow ＂1/3 power law＂, and σu/u. =3. 102, σv/u. =2. 931, σw/U. =1. 052. The coefficients are different from those in other places in Tibetan Plateau due to its special terrains. Unusual phenomena, such as that the latent heat flux measured at 2 m was always lower that ＇that measured at 8 m in the valley, have been found in all day during the observation period.

关 键 词：珠峰地区 近地层 湍流特征 气象要素日变化 

分 类 号：P404[天文地球—大气科学及气象学]