违反了 PRIMARY KEY 约束 'PK_t_counter'。不能在对象 'dbo.t_counter' 中插入重复键。 语句已终止。 2008年初东亚高空急流对我国南方低温雨雪冰冻灾害的影响及其变化的可能原因-The effect of the East-Asian jet stream on the freezing rain and snowstorms over southern China in early 2008 and the possible reason of the variation of the jet stream
doi:  10.3878/j.issn.1006-9585.2016.16072
2008年初东亚高空急流对我国南方低温雨雪冰冻灾害的影响及其变化的可能原因

The effect of the East-Asian jet stream on the freezing rain and snowstorms over southern China in early 2008 and the possible reason of the variation of the jet stream
摘要点击 203  全文点击 97  投稿时间:2016-04-06  最后修改时间:2016-05-23
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基金:  国家重点基础研究发展计划 (2012CB417201)资助和国家自然科学基金青年科学基金(41405055)
中文关键词:  雨雪冰冻灾害,垂直运动,扰动动能,扰动位势通量
英文关键词:  freezing  rain disaster, vertical  motion, eddy  kinetic energy, eddy  geopotential flux
        
作者中文名作者英文名单位
左群杰ZUO Qun-Jie中国科学院大气物理研究所云降水物理与强风暴实验室
高守亭GAO Shou-Ting中国科学院大气物理研究所云降水物理与强风暴实验室
孙效功SUN Xiao-Gong中国气象科学研究院灾害天气国家重点实验室
引用:左群杰,高守亭,孙效功..2008年初东亚高空急流对我国南方低温雨雪冰冻灾害的影响及其变化的可能原因[J].气候与环境研究
Citation:ZUO Qun-Jie,GAO Shou-Ting,SUN Xiao-Gong..The effect of the East-Asian jet stream on the freezing rain and snowstorms over southern China in early 2008 and the possible reason of the variation of the jet stream[J].Climatic and Environmental Research(in Chinese)
中文摘要:
      本文利用欧洲中长期预报中心再分析数据和中国气象局提供的降水数据分析了2008年1月到2月初东亚急流对我国南方雨雪冰冻灾害的影响,并给出来东亚急流变化可能的原因。东亚急流强度和位置的变化引起其入口区的垂直运动的变化,从而使对我国南方降雨的位置和强度发生改变。为了研究灾害发生期间东亚急流变化的原因,本文利用扰动动能方程分析了与东亚急流有关扰动动能以及方程各项的变化,结果表明:扰动动能的变化能够很好的表示东亚急流的变化;扰动位势平流对扰动动能的发展至关重要。东亚急流北部弱风区存在较小的扰动动能中心,位势通量矢量将这个中心的扰动动能输送到东亚急流的入口区并辐合,使得东亚急流增强。
Abstract:
      The effect of the East-Asian jet stream on the freezing rain and snowstorms over southern China in early 2008 were investigated using the European Centre for Medium-Range Weather Forecasts (ECMWF) interim data and precipitation data provided by the China Meteorological Administration, and the possible reason of the change of the jet stream was studied during the disaster. The variation of the vertical motion in the entrance region of the jet stream was influenced by the development of the intensity and position of the jet stream, leading to the development of the precipitation over southern China. In order to study the causes of the changes of the jet stream during the disaster, the eddy kinetic energy equation was used in this paper. The analysis suggests that the development of the jet stream was corresponding to the variation of the eddy kinetic energy. Eddy geopotential advection was important to the eddy kinetic energy. The eddy kinetic energy associated with the weak wind field located in the north of the jet stream was transported by the eddy geopotential flux to the entrance region of the jet stream and converged, leading to enhance the jet stream.
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