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广西重大低温雨雪冰冻过程500hPa信号场异常特征分析
(桂林市气象局)
AN ANALYSIS OF ABNORMAL CHARACTERRISTICS OF THE MAJOR CRYOGENIC FREEZING RAIN AND SNOW IN GUANGXI BY 500 hPa SIGNAL FIELD
(.Guilin Meteorological Bureau)
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投稿时间:2018-04-11    修订日期:2019-01-14
中文摘要: 摘 要:通过利用500hPa高度和温度信号场合成图的检验方法来分析排名前40次广西重大低温雨雪冰冻过程的环流异常特征,研究结果表明:(1)利用冷湿指数定义这种方法选取过程具备对广西重大低温雨雪冰冻的影响程度进行评估的功能。(2)40个个例绝大部分过程500hPa高度和温度信号场都有强的面积和强信号反映,正异常的表现更为突出。正异常一般表现的是高度场上的正值系统,也就是脊区,冬季高纬脊区发展通常配合冷平流的加强,冷空气堆积是广西持续低温雨雪冰冻过程出现的关键。(3)通过分析500hPa高度信号场发现:乌山脊及前侧的横槽,贝湖脊及前侧的东北横槽,及我国西北新疆一带不断分裂的小槽是广西产生低温雨雪冰冻天气的关键区域和关键因子。
Abstract:Abstract: Used 500hPa average circulation signal field and average temperature signal field to analyze the circulation anomaly characteristics of the first 40 significant cryogenic snow and rain processes.Results showed that:(1) This method that selection process by cold and wet index has the function of assessing the influence degree of Guangxi. (2) Most of the 40 cases have strong area and strong signal. Positive anomalies are more prominent. The anomaly is usually represented by a positive system on the high field, known as the ridge. The development of high latitude ridge in winter is usually combined with the strengthening of cold advection. Cold air accumulation is the key to the continuous freezing of low temperature rain and snow in Guangxi. (3) The signal field analysis can be divided into three categories, and the weather system and its performance can be understood after the analysis of the signal field and the high average field. The key areas and key systems for the cold and snow freezing weather in Guangxi are the Ural ridge and the front of transversal trough, the Baikal ridge and the front of northeast transversal trough, and the small trough in northwestern Xinjiang.
文章编号:201804110169     中图分类号:    文献标志码:
基金项目:国家自然科学基金项目(41565005);广西科学技术厅自然基金项目(2015GXNSFAA139243和桂科自07280766);桂气科2017Z06
作者单位E-mail
唐熠 桂林市气象局 glqxtty@163.com 
Author NameAffiliationE-mail
唐熠 .Guilin Meteorological Bureau glqxtty@163.com 
引用文本:
唐熠,0.[en_title][J].Meteor Mon,():-.
唐熠,0.AN ANALYSIS OF ABNORMAL CHARACTERRISTICS OF THE MAJOR CRYOGENIC FREEZING RAIN AND SNOW IN GUANGXI BY 500 hPa SIGNAL FIELD[J].Meteor Mon,():-.