桂东南的盛夏持续高温天气特征及成因分析

文章分析了2003年7月份高温环流形势变化及500 hPa高度场异常特征。500 hPa副热带高压对广西的控制、发展和地面低压区的维持是2003年盛夏高温天气形成的前提条件。副热带高压异常偏强且位置异常偏西,是桂东南出现高温持续时间长、范围广,以及极端最高气温等均突破历史最高值的主要原因。

Characters of Summer Long-lasting High Temperature Weather in Southeast Guangxi and its Cause Analysis

The article analyzes the change of high temperature circulation in July 2003 and the abnormal characters of 500 hPa height field.The long-lasting and developing of 500 hPa high pressure subtropical zone and low pressure area maintaining are the pre-condition responsible for summer long-lasting high temperature in the year of 2003.The main reason for the long-lasting,wide-ranging hot weather with very high extreme maximum temperature in southeast Guangxi is abnormally strong high pressure subtropical zone with abnormal location to the west.