| 2011年初广西异常低温冰冻灾害成因分析 |
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| 引用本文： | 韦晨.2011年初广西异常低温冰冻灾害成因分析[J].热带地理,2012,32(1):38-43,49. |
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| 作者姓名： | 韦晨 |
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| 作者单位： | 南京信息工程大学,南京,210000 |
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| 摘 要： | 利用NECP再分析资料和Micaps站点资料,对2011-01-03—28广西地区出现的异常低温冰冻灾害过程的环流背景场、物理量场和影响系统等特征进行了分析。结果表明:1)此次过程的异常环流特征表现为中高纬倒Ω流型,低纬南支槽异常活跃,构成典型的"北脊南槽"形势,有利于北方冷空气与南方暖湿气流在广西地区交汇;2)蒙古地面冷高压强度较往年偏强,位置偏东、偏南,有利于地面冷空气的堆积和不断分裂南下,影响广西地区;3)逆温区主要位于桂北,长时间降水普遍以小到中雨为主,容易形成过冷水滴,造成冻雨灾害;4)华南静止锋和高层切变线是造成此次过程的主要天气系统。
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| 关 键 词： | 低温 冻雨 环流形势 逆温层 广西 |
Causes of the Abnormal Microtherm and Frost Weather in Guangxi at the Beginning of 2011 |
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| WEI Chen.Causes of the Abnormal Microtherm and Frost Weather in Guangxi at the Beginning of 2011[J].Tropical Geography,2012,32(1):38-43,49. |
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| Authors: | WEI Chen |
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| Institution: | WEI Chen (Nanjing University of Information Science and Technology,Nanjing 210000,China) |
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| Abstract: | The circulation background,physical variables and effect system of the rare microherm and frost weather in Guangxi during the period during Jan.3rd-28th in 2011 are analysed with the NCEP reanalysis data and observation data.The results show that:1) The abnormal circulation situation was characterized by an inverted Ω circulation at middle-high latitudes while an extremely active south branch trough at low-latitudes,forming a typical pattern of north ridge and south trough circulation,which was favorable to the convergence of northerly cold air and southerly warm moist air over Guangxi region;2) The Mongolian surface cold high pressure was also abnormal,whose strength was stronger and position was further east and south;3) The temperature inversion region was distributed mainly in the north of Guangxi,that could cause freezing rain disaster,because of continuous light-moderate rainfall easily forming supercooled water droplets;4) The main synoptic systems of the process were South China stationary front and high layer shear line. |
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| Keywords: | microtherm freezing rain circulation situation temperature inversion layer Guangxi |
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