1957—2015年桂林市极端低温时空特征及天气形势分析

Synoptic Situation Analysis and Spatial-temporal Characteristics of Extreme Low Temperature in Guilin City During 1957—2015

桂林作为国际化旅游城市,极端天气造成的灾害会给桂林社会经济的可持续发展带来显著的负面影响。本文收集整理1957—2015年桂林市13个国家级气象站的资料,采用气候倾向率的方法,对极端低温指数的趋势进行分析,造成桂林极端低温的主要天气系统有阻塞高压、切断低压、南支槽等。通过分析500 h Pa高度形势场,可将影响桂林的极端低温天气系统分为阻塞高压+横槽转竖型、两槽一脊型、多波动槽脊型。

As an international tourist city, the disasters caused by extreme weather will bring significant negative impact on the sustainable development of Guilin＇s social economy. In this paper,the data of 13 national meteorological stations in Guilin from 1957 to 2015 were collected, and the trend of extreme low temperature indexs was analyzed by the method of climatic tendency rate.The main weather systems that cause extreme low temperature in Guilin include blocking high, cut-off-low, south branch,ect. By analyzing the 500 hPa high situation field, the extreme low temperature that affects Guilin can be divided into blocking high ＋transverse trough vertical type, two slot one ridge type, and multi wave trough ridge type.