| Contribution of cloud condensate to surface rainfall process |
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| 作者姓名： | ZHOU Yushu CUI Xiaopeng LI Xiaofan |
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| 作者单位： | 1. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; 2. Joint Center for Satellite Data Assimilation and NOAA/NESDIS/Office of Research and Applications Camp Springs, Maryland, USA |
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| 基金项目： | 国家自然科学基金;中国科学院知识创新工程项目;中国科学院引进国外杰出人才基金;国家重点基础研究发展计划(973计划) |
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| 摘 要： | Contribution of cloud condensate to surface rainfall processes is investigated in a life span of tropical convection based on hourly data from a two-dimensional cloud resolving simulation. The model is forced by the large-scale vertical velocity, zonal wind and horizontal advections obtained from tropical ocean global atmosphere coupled ocean-atmosphere response experiment (TOGA COARE). The results show that during the genesis, development, and decay of tropical convection, calculations with water vapor overestimate surface rain rate, and cloud condensate plays an important role in correcting overestimation in surface rain rates. The analysis is carried out in deep convective clouds and anvil clouds during the development of tropical convection. The surface rain rates calculated with water vapor in deep convective clouds and anvil clouds have similar magnitudes, the large surface rain rate appears in deep convective clouds due to the consumption of water hydrometeors whereas the small surface rain rate occurs in anvil clouds because of the gain of ice hydrometeors. Further analysis of the grid data shows that the surface rain rates calculated with water vapor and with cloud condensate are negatively correlated with the correlation coefficient of -0.85, and the surface rain rate calculated with cloud condensate is mainly contributed to the water hydrometeors in the tropical deep convective regime.
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| 关 键 词： | cloud condensate surface rain rate cloud resolving simulation. |
Contribution of cloud condensate to surface rainfall process |
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| ZHOU Yushu,CUI Xiaopeng,LI Xiaofan.Contribution of cloud condensate to surface rainfall process[J].Progress in Natural Science,2006,16(9):967-973. |
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| Authors: | ZHOU Yushu CUI Xiaopeng LI Xiaofan |
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| Institution: | 1. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
2. Joint Center for Satellite Data Assimilation and NOAA/NESDIS/Office of Research and Applications Camp Springs, Maryland, USA |
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| Abstract: | Contribution of cloud condensate to surface rainfall processes is investigated in a life span of tropical convection based on hourly data from a two-dimensional cloud resolving simulation. The model is forced by the large-scale vertical velocity, zonal wind and horizontal advections obtained from tropical ocean global atmosphere coupled ocean-atmosphere response experiment (TOGA COARE). The results show that during the genesis, development, and decay of tropical convection, calculations with water vapor overestimate surface rain rate, and cloud condensate plays an important role in correcting overestimation in surface rain rates. The analysis is carried out in deep convective clouds and anvil clouds during the development of tropical convection. The surface rain rates calculated with water vapor in deep convective clouds and anvil clouds have similar magnitudes, the large surface rain rate appears in deep convective clouds due to the consumption of water hydrometeors whereas the small surface rain rate occurs in anvil clouds because of the gain of ice hydrometeors. Further analysis of the grid data shows that the surface rain rates calculated with water vapor and with cloud condensate are negatively correlated with the correlation coefficient of -0.85, and the surface rain rate calculated with cloud condensate is mainly contributed to the water hydrometeors in the tropical deep convective regime. |
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| Keywords: | cloud condensate surface rain rate cloud resolving simulation |
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