| 一次强风暴的垂直环境特征数值模拟分析 |
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| 引用本文： | 陈力强,周小珊,杨森.一次强风暴的垂直环境特征数值模拟分析[J].气象,2004,30(9):3-8. |
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| 作者姓名： | 陈力强 周小珊 杨森 |
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| 作者单位： | 中国气象局沈阳大气环境研究所,110016 |
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| 摘 要： | 应用MM 5模式对东北冷涡诱发的 2 0 0 2年 7月 1 2日强风暴进行了数值模拟 ,较成功地模拟出中尺度强对流风暴。发现冷涡后部中层干冷空气绝热下沉是东北冷涡 70 0hPa附近干暖盖形成和维持的重要机制 ,而低层暖湿气流爬升及干暖盖的抑制作用是东北冷涡强对流不稳定能量积累的重要机制。风暴发生前持续的低层西南风到中层西北风的风垂直切变产生的差动平流 ,加剧了层结不稳定 ,而风暴临近风垂直切变方向的快速逆转使热成风不平衡 ,必须通过激发垂直环流以适应其变化 ,对风暴发展有重要作用。
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| 关 键 词： | 东北冷涡 强风暴 数值模拟 垂直特征 |
Numerical Simulation and Analysis of Vertical Environment Character of a Severe Storm |
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| Chen Liqiang,Zhou Xiaoshan,Yang Sen.Numerical Simulation and Analysis of Vertical Environment Character of a Severe Storm[J].Meteorological Monthly,2004,30(9):3-8. |
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| Authors: | Chen Liqiang Zhou Xiaoshan Yang Sen |
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| Abstract: | A severe storm caused by northeast cold vortex over Liaoning Province on 12 July 2002, was successfully simulated by MM5 model. Middle-level dry cold air adiabatic subsiding is the important mechanism of 700hPa dry-warm lid establishment and maintenance. Both the Warm moist ascending airflow and the dry warm lid restraining are the important mechanism of convective instable energy accumulation. The differential advection which is produced by vertical wind shear from southwest at low-level to the northwest at the middle-level enhances the stratification instability before the storm approach, and the rapid anti-clockwise rotation of wind vertical shear when the storm approach that made thermal wind imbalance and inspired vertical circulation to adapt it's change, and it is important to the development of the storm. |
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| Keywords: | northeastern cold vortex severe storm numerical simulation vertical character |
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