| 祁连山夏季地形云结构和云微物理过程的模拟研究(II):云微物理过程和地形影响 |
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| 引用本文： | 刘卫国,刘奇俊.祁连山夏季地形云结构和云微物理过程的模拟研究(II):云微物理过程和地形影响[J].高原气象,2007(1). |
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| 作者姓名： | 刘卫国 刘奇俊 |
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| 作者单位： | 中国气象局中国气象科学研究院中国气象局云雾物理重点开放实验室 北京100081(刘卫国)，中国气象局国家气象中心 北京100081(刘奇俊) |
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| 基金项目： | “十五”国家科技攻关项目“人工增雨技术研究及示范(2001BA610-06)”，社会公益研究专项(2004DIB3J116)共同资助 |
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| 摘 要： | 本文是祁连山夏季地形云结构和微物理过程模拟的第II部分。文中利用第I部分中祁连山夏季两个地形云降水个例的模拟结果,详细分析了地形云及其降水发展期间云微物理过程的特征及变化,并通过与平坦地面条件下模拟结果的对比,研究了云发展过程中的地形影响。研究表明,地形云中微物理过程的发展受地形影响很大,冰相微物理过程明显增强;地形影响下云的主要降水机制也受到影响甚至被改变。
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| 关 键 词： | 祁连山 微物理过程 地形云 降水机制 |
The Numerical Simulation of Orographic Cloud Structure and Cloud Microphysical Processes in Qilian Mountains in Summer. Part(II): Cloud Microphysical Processes and Orographic Influence |
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| LIU Wei-guo,LIU Qi-jun.The Numerical Simulation of Orographic Cloud Structure and Cloud Microphysical Processes in Qilian Mountains in Summer. Part(II): Cloud Microphysical Processes and Orographic Influence[J].Plateau Meteorology,2007(1). |
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| Authors: | LIU Wei-guo LIU Qi-jun |
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| Institution: | LIU Wei-guo1,LIU Qi-jun2 |
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| Abstract: | This is Part II of our series study.In this part,the characteristics of orographic cloud microphysical processes,basing on the numerical simulation results of two cases of Qilian mountains orographic cloud in Part I,are studied.The orographic influence on cloud microphysical processes are emphasis of our research, and these processes are investigated by comparison of simulation results over complicated terrain and flat surface.The analysis shows that the microphysical processes of orographic cloud are greatly influenced by topography.The microphysical processes,especially the ice-phase microphysical processes,are enhanced evidently because of orographic lifting and interactions between mountain airflow(upslope airflow,downslope airflow) and downdraft occurred by precipitation.These changes of microphysical processes lead to the grosses,distribution and life time of water substance are influenced.Contrarily,these changes of water substance characteristic also impact on microphysical processes.The analysis also suggests orographic influence also affect cloud precipitation mechanism.In Case 1,main precipitation mechanism is warm cloud precipitation,and orographic influence intensify this kind of mechanism.In Case 2,main precipitation mechanism is warm cloud precipitation in the beginning,but it switch to cold cloud precipitation after 50 min.The study shows that the orographic influence is the most important cause of conversion of main precipitation mechanism in Case 2. |
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| Keywords: | Microphysical process Orographic cloud Qilian mountains Precipitation mechanism |
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