| 2008年初广东罕见低温雨雪冰冻天气的成因初探 |
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| 引用本文： | 吴乃庚,林良勋,李天然,陈炳洪.2008年初广东罕见低温雨雪冰冻天气的成因初探[J].广东气象,2008,30(1):4-7. |
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| 作者姓名： | 吴乃庚 林良勋 李天然 陈炳洪 |
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| 作者单位： | 广州中心气象台,广东广州,510080 |
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| 基金项目： | 国家自然科学基金项目(40575021)，广东省科技计划重点引导项目(2005B32601008)共同资助 |
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| 摘 要： | 利用常规气象观测资料、NCEP／NCAR再分析资料，以及国家气候中心的海温监测资料等，初步分析2008年初我国南方持续低温雨雪冰冻天气过程的成因的结果表明，此次罕见天气过程是在近年来最严重的一次“拉尼娜”事件背景下发生的，与欧亚地区持续大气环流异常密切相关。在“北脊南槽”和西太平洋副高偏北偏强的形势下，北方冷空气不断从青藏高原东北侧南下，同时孟加拉湾和南海地区源源不断的水汽往北到东北方向输送，冷暖气流在我国南方地区频繁交汇，使对流层中低层形成逆温层和局地经向环流产生异常，造成了持续低温雨雪冰冻过程。
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| 关 键 词： | 天气学 大气环流异常 冷暖气流 局地经向环流 “拉尼娜”事件 罕见低温雨雪冰冻 广东 |
| 文章编号： | 1007-6190(2008)01-0004-04 |
Causality Analysis of the Cryogenic Freezing Rain and Snow Weather in Guangdong Province at the Beginning of 2008 |
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| WU Nai-geng,LIN Liang-xun,LI Tian-ran,CHEN Bing-hong.Causality Analysis of the Cryogenic Freezing Rain and Snow Weather in Guangdong Province at the Beginning of 2008[J].Journal of Guangdong Meteorology,2008,30(1):4-7. |
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| Authors: | WU Nai-geng LIN Liang-xun LI Tian-ran CHEN Bing-hong |
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| Institution: | WU Nai - geng , LIN Liang - xun, LI Tian - ran, CHEN Bing - hong (Guangzhou Central Meteorological Observatory , Guangzhou 510080, China) |
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| Abstract: | The possible causes of cryogenic freezing rain and snow weather in Guangdong in 2008 are studied by using observational data,and NCEP/NCAR daily reanalysis data.The results show that this case is associated with LaNina event and anomalous atmospheric circulation.The circulation situation of the middle and high levels in Asia and Europe was a pattern of north ridge and south trough circulation and the Western Pacific Subtropical High was stronger in intensity and northward in position.The cold air moving down from the north-east side of Tibetan Plateau and butting up against moist southerly form the Bay of Bengal and the South China Sea produced the low-level temperature inversion over Southern China and the anomalous local-meridional circulation,which caused the continuous cryogenic freezing rain and snow weather. |
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| Keywords: | synoptic meteorology anomalous atmospheric circulation cold and warm stream local meridional circulation LaNina cryogenic freezing rain and snow weather Guangdong |
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