摘要
分析了１９９８年１０月在北京 ３２５ ｍ气象塔 ４７ ｍ、１２０ ｍ及 ２８０ ｍ ３层取得的湍流资料，讨论了湍流宏观统计特征量等随稳定度变化的规律。结果表明，４７ｍ及 １２０ ｍ观测到的感热通量的日变化基本一致，城市边界层中近地层高度可达１００ ｍ左右，这主要是由于下垫面粗糙度很大所致、同时发现当冷空气来临时，边界层中的感热通量会有明显增大。
The turbulent data obtained at the height of 47 m, 120 m, and 280 m at the Beijing 325 m meteorological tower in October-November 1998 have been analysed in this study. The variations of the turbulent statistics with the stability have been investigated. The results show that diurnal variations of the sensible heat flux observed at 47 m is almost the same as that observed at 120 m. It shows that the height of the urban surface layer can be over 100 m due to the large roughness length over the urban surface. At the same time, it is found that the sensible heat flux has a distinct increase when a cold front comes.
出处
《大气科学》
CSCD
北大核心
2002年第2期241-248,共8页
Chinese Journal of Atmospheric Sciences
基金
中国科学院创新工程项目 KZCX2-204
中国科学院"九五"重大项目 KZ951-A1-403
国家自然科学基金资助项目40
