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气象:2017,43(10):1302-1308
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2017年7月大气环流和天气分析
霍达1,孙军1,储文宗2
(1 国家气象中心,北京 100081 2 上饶市横峰县气象局,江西上饶 334300)
Analysis of the July 2017 Atmospheric Circulation and Weather
HUO Da1,SUN Jun1,CHU Wenzong2
(1 National Meteorological Centre, Beijing 100081 2 Hengfeng County Weather Station, Shangrao, Jiangxi 334300)
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投稿时间:2017-08-28    修订日期:2017-09-04
中文摘要: 2017年7月大气环流特征为,极涡呈偶极型分布,主体强度较常年偏强;中高纬环流呈5波型分布,北半球副热带高压强度偏强,西太平洋副热带高压整体位置偏北,脊线持续北抬。7月我国平均气温为23.2℃,较常年同期(21.9℃)偏高1.3℃。全国平均降水量112.5 mm,较常年同期(120.6 mm)偏少6.7%,东北地区西部、江南地区东北部、江淮地区西南部和新疆北部等地降水偏少显著。强降水天气主要出现在东北地区和南方,7月我国出现9次区域性暴雨天气过程,7月13—14日降水过程多方面突破历史极值。7月西北太平洋地区有8个台风生成,其中7个台风活跃,3个台风登陆我国,数量较历史同期明显偏多;台风生成个数与1994、1967和1971年并列为历史同期最多。内蒙古东部出现气象干旱,江淮江汉伏旱发展。中东部地区和新疆持续高温天气,最长持续天数为20 d,1884站出现35℃以上高温天气;高温极值为49℃,发生在吐鲁番站。
Abstract:The following are the main characteristics of the general circulation of atmosphere in July 2017. There were two polar vortex centers with stronger strength than normal in the Northern Hemisphere. The mid high latitude circulation showed a five wave pattern. The strength of subtropical high in the Northern Hemisphere was stronger than usual, the location of northwestern Pacific subtropical high was by north and the ridge line oscillated greatly. In July, the monthly mean temperature of China was 23.2℃, 1.3℃ higher than usual. The monthly mean precipitation of China was 112.5 mm, 6.7% less than usual, and especially in the west of Northeast China, northeast of Jiangnan, southwest of Jianghuai and north of Xinjiang; it rained much less. The heavy precipitation processes in July mainly occurred in Northeast China and Southern China, and there were nine regional torrential rain processes. What’s more, the rainstorm from 13 to 14 July broke the extreme values in historic records in many aspects. Eight typhoons were generated in the Northwest Pacific in July, of which seven were active and three landed in China. The number of typhoon is more than normal and is the maximum between with 1994, 1967 and 1971. In addition, drought hit the east of Inner Mongolia, and the regions of Jianghuai and Jianghan. Heat wave continued in central and eastern China as well as Xinjiang, lasting as long as 20 days. High temperature weather over 35℃ happened at 1884 stations and the extreme high temperature was found in Turpan, being 49℃.
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引用文本:
霍达,孙军,储文宗,2017.2017年7月大气环流和天气分析[J].气象,43(10):1302-1308.
HUO Da,SUN Jun,CHU Wenzong,2017.Analysis of the July 2017 Atmospheric Circulation and Weather[J].Meteor Mon,43(10):1302-1308.