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气象:2019,45(12):1762-1768
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2019年9月大气环流和天气分析
孙舒悦,董林
(国家气象中心,北京 100081)
Analysis of the September 2019 Atmospheric Circulation and Weather
SUN Shuyue,DONG Lin
(National Meteorological Centre, Beijing 100081)
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投稿时间:2019-10-24    修订日期:2019-10-31
中文摘要: 2019年9月环流特征如下:北半球极涡呈单极型分布,强度偏弱;亚洲大陆中高纬为两槽一脊型;西北太平洋副热带高压明显偏西、偏强。9月全国平均降水量62.4 mm,较常年同期(65.3 mm)偏少4%;全国平均气温为17.7℃,较常年同期(16.6℃)偏高1.1℃。月内共出现了4次主要的区域性强降水过程,其中2次降水活动与台风有关。共有6个台风在西北太平洋和南海海域活动,无台风登陆我国。月内,华西秋雨南区开始偏早,影响显著;长江中下游气象干旱持续发展;江南、华南北部和华北部分地区出现高温天气;黑龙江、内蒙古等多地遭受风雹灾害;黑龙江和内蒙古部分地区遭低温冷冻灾害。
Abstract:The main characteristics of the general atmospheric circulation in September 2019 are as follows. The polar vortex of Northern Hemisphere presented a single-pole pattern. In the mid-high latitudes of Asia, the circulation presented a two-trough pattern. The Northwest Pacific subtropical high was more westward and stronger than normal. The monthly mean precipitation amount is 62.4 mm, which is less than its normal value (65.3 m) by 4%. The monthly mean temperature is 17.7℃, 1.1℃ higher than its climatological mean (16.6℃). Four regional torrential rainfall processes occurred in China during September, and two of them were caused by tropical cyclones. In September, six tropical cyclones were generated over the Northwest Pacific and the South China Sea, no one landing China. Moreover, the autumn rain of West China started earlier than normal in the southern area and had a significant impact. Meteorological drought developed continuously over the lower-middle reaches of the Yangtze River. High air temperatures appeared over South to Yangtze River, South China and parts of North China. Heilongjiang, Inner Mongolia and many other regions were attacked by hail, and some areas of the two provinces suffered from low temperature and freezing disasters.
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孙舒悦,董林,2019.2019年9月大气环流和天气分析[J].气象,45(12):1762-1768.
SUN Shuyue,DONG Lin,2019.Analysis of the September 2019 Atmospheric Circulation and Weather[J].Meteor Mon,45(12):1762-1768.