| A Cloud-resolving Study on the Role of Cumulus Merger in MCS with Heavy Precipitation |
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| 作者姓名： | 付丹红 郭学良 |
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| 作者单位： | [1]Laboratory of Cloud-Precipitation Physics and Severe Storms （LACS）,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 [2]Graduate University of Chinese Academy of Sciences, Beijing 100039 |
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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，科技部科研项目 |
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| 摘 要： | The cumulus merging processes in generating the mesoscale convective system （MCS） on 23 August 2001 in the Beijing region are studied by using a cloud-resolving mesoscale model of MM5. The results suggest that the merger processes occurred among isolated convective cells formed in high mountain region during southerly moving process play critical role in forming MCS and severe precipitating weather events such as hailfall, heavy rain, downburst and high-frequency lightning in the region. The formation of the MCS experiences multi-scale merging processes from single-cell scale merging to cloud cluster-scale merging, and high core merging. The merger process can apparently alter cloud dynamical and microphysical properties through enhancing both low- and middle-level forcing. Also, lightning flash rates are enhanced by the production of more intense and deeper convective cells by the merger process, especially by which, the more graupel-like ice particles are formed in clouds. The explosive convective development and the late peak lightning flash rate can be found during merging process.
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| 关 键 词： | 积云 中尺度对流系统 降水量 闪电 |
| 收稿时间： | 2006-01-13 |
| 修稿时间： | 2006-05-15 |
A cloud-resolving study on the role of cumulus merger in MCS with heavy precipitation |
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| Danhong Fu,Xueliang Guo.A Cloud-resolving Study on the Role of Cumulus Merger in MCS with Heavy Precipitation[J].Advances in Atmospheric Sciences,2006,23(6):857-868. |
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| Authors: | Danhong Fu Xueliang Guo |
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| Institution: | Laboratory of Cloud-Precipitation Physics and Severe Storms (LACS), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, Graduate University of Chinese Academy of Sciences, Beijing 100039,Laboratory of Cloud-Precipitation Physics and Severe Storms (LACS), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | The cumulus merging processes in generating the mesoscale convective system (MCS) on 23 August 2001 in the Beijing region are studied by using a cloud-resolving mesoscale model of MM5. The results suggest that the merger processes occurred among isolated convective cells formed in high mountain region during southerly moving process play critical role in forming MCS and severe precipitating weather events such as hailfall, heavy rain, downburst and high-frequency lightning in the region. The formation of the MCS experiences multi-scale merging processes from single-cell scale merging to cloud cluster-scale merging, and high core merging. The merger process can apparently alter cloud dynamical and microphysical properties through enhancing both low- and middle-level forcing. Also, lightning flash rates are enhanced by the production of more intense and deeper convective cells by the merger process, especially by which, the more graupel-like ice particles are formed in clouds. The explosive convective development and the late peak lightning flash rate can be found during merging process. |
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| Keywords: | MM5 MCS cloud merger lightning precipitation |
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