| Roles of Mesoscale Terrain and Latent Heat Release in Typhoon Precipitation： A Numerical Case Study |
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| 引用本文： | 李昀英,黄伟,赵焦枝.Roles of Mesoscale Terrain and Latent Heat Release in Typhoon Precipitation： A Numerical Case Study[J].大气科学进展,2007,24(1):35-43. |
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| 作者姓名： | 李昀英 黄伟 赵焦枝 |
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| 作者单位： | [1]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 [2]Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101 [3]Shanghai Typhoon Institute, China Meteorological Administration, Shanghai 200030 [4]Meteorology Center of Beijing Military, PLAAF, Beijing 100061 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金 |
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| 摘 要： | The mesoscale orographic effects on typhoon Aere＇s precipitation are simulated using an Advanced Regional Eta-coordinate Model （AREM） version 3.0. In particular, the effects of the latent heat release are studied by two comparable experiments： with and without condensational heating. The results show that the typhoon rainfall is tripled by the southeastern China mesoscale terrain, and the condensational heating is responsible for at least half of the increase. One role of the latent heat release is to warm the atmosphere, leading to a depression of the surface pressure, which then causes a larger pressure difference in the zonal direction. This pressure gradient guides the water vapour to flow into the foothills, which in turn amplifies the water vapour flux divergence amplified, causing the typhoon rainfall to increase eventually. The other role of the latent heat release is to make the convection more organized, resulting in a relatively smaller rain area and stronger precipitation.
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| 关 键 词： | 台风降水 中尺度地形 潜热释放 数值模型 |
| 收稿时间： | 2005-11-18 |
| 修稿时间： | 2006-06-06 |
Roles of mesoscale terrain and latent heat release in typhoon precipitation: A numerical case study |
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| Li?Yunying,Huang?Wei,Zhao?Jiaozhi.Roles of mesoscale terrain and latent heat release in typhoon precipitation: A numerical case study[J].Advances in Atmospheric Sciences,2007,24(1):35-43. |
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| Authors: | Li Yunying Huang Wei Zhao Jiaozhi |
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| Institution: | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;
Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101,Meteorology Center of Beijing Military, PLAAF, Beijing 100061 |
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| Abstract: | The mesoscale orographic effects on typhoon Aere's precipitation are simulated using an Advanced Regional Eta-coordinate Model (AREM) version 3.0. In particular, the effects of the latent heat release are studied by two comparable experiments: with and without condensational heating. The results show that the typhoon rainfall is tripled by the southeastern China mesoscale terrain, and the condensational heating is responsible for at least half of the increase. One role of the latent heat release is to warm the atmosphere,leading to a depression of the surface pressure, which then causes a larger pressure difference in the zonal direction. This pressure gradient guides the water vapour to flow into the foothills, which in turn amplifies the water vapour flux divergence amplified, causing the typhoon rainfall to increase eventually. The other role of the latent heat release is to make the convection more organized, resulting in a relatively smaller rain area and stronger precipitation. |
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| Keywords: | latent heat release mesoscale terrain typhoon precipitation numerical modeling |
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