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气象:2018,44(10):1370-1376
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2018年7月大气环流和天气分析
张夕迪,孙军
(国家气象中心,北京 100081)
Analysis of the July 2018 Atmospheric Circulation and Weather
ZHANG Xidi,SUN Jun
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投稿时间:2018-08-24    修订日期:2018-08-29
中文摘要: 2018年7月大气环流的主要特征是极涡偏强且呈单极型分布,中高纬环流呈4波型,西太平洋副热带高压强度较常年明显偏强,位置较常年明显偏北。7月全国平均气温22.9℃,较常年同期偏高1.1℃,为1961年以来历史同期第三高;全国平均降水量133.8 mm,比常年同期(120.6 mm)偏多11%,与历史同期相比呈现北多南少的分布特征。月内我国有7次区域性暴雨天气过程,多站出现极端日降水量。7月共有5个热带气旋在西北太平洋和南海活动,并有“玛莉亚”、“山神”、“安比”3个台风登陆,生成和登陆个数均较常年偏多。我国中东部出现持续性高温天气,同时强对流天气频发,影响范围较广。
Abstract:The main characteristics of the general atmospheric circulation in July 2018 are as follows. There was one polar vortex center in the Northern Hemisphere, which was stronger than usual. The 500 hPa geopotential height presented the distribution of a 4 wave pattern in the mid high latitude of the Northern Hemisphere. The strength of western Pacific subtropical high was much stronger and its location was by north compared to normal years. The monthly mean temperature was 22.9℃, 1.1℃ higher than normal, which ranks the third highest since 1961. The monthly mean precipitation amount over the whole country was 133.8 mm, which is more than normal (120.6 mm) by 11%. For the distribution of precipitation, northern China received more rain than usual, but the south had less. Seven rainfall processes with some extreme records occurred in China this month. Five tropical cyclones were active over the Northwest Pacific and the South China Sea, and three of them landed. The total and landing numbers of tropical cyclones were more than usual. The long lasting high temperature events happened in central and eastern China. Meanwhile, severe convective events occurred frequently, influencing a wide range of areas.
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张夕迪,孙军,2018.2018年7月大气环流和天气分析[J].气象,44(10):1370-1376.
ZHANG Xidi,SUN Jun,2018.Analysis of the July 2018 Atmospheric Circulation and Weather[J].Meteor Mon,44(10):1370-1376.