Different characteristics of the structure of atmosphericboundary layer between dry and rainy periods overthe northern Tibetan Plateau |
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| Authors: | MaoShan Li YaoMing M WeiQiang M Ishikawa Hirohiko FangLin Sun Shinya Ogino |
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| Affiliation: | Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Cold and Arid Region Environmentaland Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;1. Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Cold and Arid Region Environmentaland Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China2. Institute of Tibetan Plateau Researc;Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Cold and Arid Region Environmentaland Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;Disaster Prevention Research Institute, Kyoto University, Kyoto 611-0011, Japan;Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Cold and Arid Region Environmentaland Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;The Graduate School of Science and Technology, Kobe University, Kobe 657, Japan |
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| Abstract: | In this paper, based on in-situ observational data of the Coordinated Enhanced Observing Period (CEOP) Asia-AustraliaMonsoon Project (CAMP) on the Tibetan Plateau (CAMP-Tibet), structure of the Atmospheric Boundary Layer (ABL) waspreliminarily studied during the dry and rainy seasons. The main results show: (a) Diurnal variation of the ABL is obvious overthe northern Tibetan Plateau area. The height of the ABL is different with the season change, which ranges from 2,211 m to4,430 m during the pre-monsoon season and from 1,006 m to 2,212 m during the monsoon season. The ABL height is higherduring the dry period than during the rainy period. (b) The humidity is lower during the dry period than during the rainy period,and there are reverse humidity during both periods. (c) Horizontal wind direction is mostly west during the dry period, eastunder the height of 2,500 m and west above the height of 2,500 m during the rainy period. The wind speed is low during boththe rainy and dry periods in the lower ABL layer. The wind speed is stronger within the upper ABL during the dry period thanduring the rainy period. |
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| Keywords: | Tibetan Plateau structure characteristics atmospheric boundary layer dry period rainy period |
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