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.
出处
《高原气象》
CSCD
北大核心
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
关键词
珠峰地区
近地层
湍流特征
气象要素日变化
Rongbuk valley
Surface layer
Turbulent characteristic
Diurnal variation of meteorology
