| 一次α中尺度低涡暴雨的数值模拟 |
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| 引用本文： | 何锋,何斌,李云泉,范晓红,董旭.一次α中尺度低涡暴雨的数值模拟[J].气象科学,2010,30(1):67-73. |
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| 作者姓名： | 何锋 何斌 李云泉 范晓红 董旭 |
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| 作者单位： | 嘉兴市气象局,浙江,嘉兴,314050 |
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| 基金项目： | 浙江省气象局重大项目"WRF模式研究" |
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| 摘 要： | 用WRF模式对2007年4月21—22日的一次中α低涡暴雨过程进行了高分辨率模拟,结果表明:(1)该低涡的产生与湖北西部的地形条件有一定的联系,低压倒槽系统为其提供了必要的环流背景,反演自FY-2 C卫星的TBB资料较好地反映了该中α低涡的整个活动过程。(2)对低涡发展最强阶段的动力和热力结构分析表明,低涡右侧为较强的上升运动,而其左侧则为下沉运动,在中低层冷空气上部有南侧暖湿空气上爬造成的次级上升运动;低涡左侧存在较明显的湿斜压锋区,后部则有明显的干冷气切入;南风风量对总体水汽输送的贡献要大于西风风量。(3)WRF模式中NOAH和热扩散陆面方案的对比分析表明,NOAH方案更加有利于低涡中心的发展,因此能够产生较热扩散方案更强的中心区降水,但是这种增强作用主要分布在低涡区附近,其他地区差别不大。
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| 关 键 词： | 暴雨 数值模拟 低涡 |
| 收稿时间： | 2009/1/12 0:00:00 |
Numerical simulation of a case of meso-α vortex rainstorm |
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| He Feng,He Bin,Li Yunquan,Fan Xiaohong,Dong Xu.Numerical simulation of a case of meso-α vortex rainstorm[J].Scientia Meteorologica Sinica,2010,30(1):67-73. |
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| Authors: | He Feng He Bin Li Yunquan Fan Xiaohong Dong Xu |
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| Institution: | He Feng He Bin Li Yunquan Fan Xiaohong Dong Xu (Jiaxing Meteorological Bureau,Zhejiang Jiaxing 314050,China) |
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| Abstract: | WRF model is used to simulate meso-α vortex rainstorm of 21-22 Apr. 2007. The results indicate that (1) The genesis of the vortex relates with the terrain condition in the west of Hubei province to some extent. The low pressure trough system provides necessary circulation background for it. The TBB data retrieved from FY-2C satellite reflected the entire activities of the meso-α vortex. (2) Analysis on the thermal-dynamic structure of the vortex in its strongly developing phase indicates that there is strong ascending motion on its right side, while sinking motion on its left side. Warm and moist air climbes upon the cold air at the mid-low level which forms the secondary upward movement. On the left side of the vortex exists an obvious barocline frontal zone and dry cold air enters into the back vortex. The southerly component of wind makes more contribution to moist transportation than the westerly component of wind. (3) Comparing NOAH LSM scheme with thermal diffusion one in WRF moel, it is indicated that NOAH scheme is beneficial to vortex center deepening, so it can produce more precipitation. Such enhancement mainly distributes around the vortex, while there is no obvious difference in other areas. |
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| Keywords: | Rainstorm Numerical simulation Low vortex |
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