| 北京城市下垫面边界层湍流统计特征 |
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| 引用本文： | 刘辉志,洪钟祥.北京城市下垫面边界层湍流统计特征[J].大气科学,2002,26(2):241-248. |
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| 作者姓名： | 刘辉志 洪钟祥 |
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| 作者单位： | 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 |
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| 基金项目： | 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及国家自然科学基金资助项目40105003共同资助 |
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| 摘 要： | 分析了1998年10月在北京325 m气象塔47 m、120m及280m 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,47 m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100m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.
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| 关 键 词： | 城市下垫面 湍流 感热通量 北京 |
Turbulent Statistical Characteristics over the Urban Surface |
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| Liu Huizhi and Hong Zhongxiang.Turbulent Statistical Characteristics over the Urban Surface[J].Chinese Journal of Atmospheric Sciences,2002,26(2):241-248. |
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| Authors: | Liu Huizhi and Hong Zhongxiang |
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| Abstract: | 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. |
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| Keywords: | urban boundary layer turbulent statistics sensible heat flux Beijing |
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