| 2008年1月末九江雨凇转大雪天气过程成因分析 |
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| 引用本文： | 王伟,朱星球,李眠云,沈德建.2008年1月末九江雨凇转大雪天气过程成因分析[J].气象与减灾研究,2008,31(4):65-68. |
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| 作者姓名： | 王伟 朱星球 李眠云 沈德建 |
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| 作者单位： | 1. 九江市气象局,江西,九江,332000
2. 江西省气象台,江西,南昌,330046 |
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| 摘 要： | 对2008年1月25—29日九江市一次雨凇转大到暴雪天气过程的大气垂直结构进行了分析。结果表明，在雨凇和降雪区域中层有暖层，低层有冷层，且存在对称不稳定层结。垂直风切变明显，有利于对称不稳定能量积累和上升气流的形成。高、低空急流辐散、辐合相互垂直，引发的较强上升运动是雨雪天气得以维持的重要条件。东西风向切变使冷、暖气流在雨雪区域上空交汇，形成水平气旋性辐合，产生垂直运动，且与垂直风切变相互作用，促动上、下层动量传递，使高、低空急流维持。雨凇转大到暴雪时，暖层气温降低，垂直风切变向上增强，对称不稳定能量增大，风向切变辐合加大，上升气流和水汽输送加大。
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| 关 键 词： | 雨凇 大雪 大气垂直特征 对称不稳定 |
Analysis of a Glaze Ice to Heavy Snow Weather Process |
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| WANG Wei,ZHU Xing-qiu,LI Mian-yun,SHEN De-jian.Analysis of a Glaze Ice to Heavy Snow Weather Process[J].Meteorology and Disaster Reduction Research,2008,31(4):65-68. |
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| Authors: | WANG Wei ZHU Xing-qiu LI Mian-yun SHEN De-jian |
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| Institution: | WANG Wei , ZHU Xing-qiu , LI Mian-yun , SHEN De-jian. Jiujiang Municipal Weather Bureau, Jiujiang 332000, China 2. Jiaugxi Provincial Meteorological Observatory, Nanchang 330046, China |
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| Abstract: | The vertical structure of a glaze ice to heavy snow weather process in Jiujiang during January 25--29, 2008 is analyzed. The results indicate that there are middle-level warm layer, low-level cold layer and symmetric instable stratification. The vertical wind shear is obvious and is favorable for the accumulation of symmetrical instable energy and the formation of updraft. The high-level and low-level jet divergence and convergence are mutually perpendicular, generating strong ascending motion, which are the important conditions for the snow weather keeping. The easterly and westerly wind shears cause the cold and the warm air meeting above the snow region and forming the horizontal cyclonic convergence and vertical motion, which interact with the vertical wind shear to initiate the momentum transfer between the upper and lower layer and maintain the high-level and low- level jet. When the glaze ice transfers into the heavy snow, the temperature at the warm level decreases, the vertical wind shear enhances upward, the symmetric instable energy increases, the wind direction shear convergence becomes strong, and the ascending motion and the water-vapor transfer strengthen. |
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| Keywords: | Glaze ice Heavy snow Atmospheric vertical characteristic Symmetric instable |
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