2019年10月大气环流和天气分析

Analysis of the October 2019 Atmospheric Circulation and Weather

2019年10月大气环流主要特征如下:北半球极涡呈偶极型,中高纬地区西风带为4波型分布,西太平洋副热带高压呈东西向带状分布,较常年位置偏西偏强。全国平均降水量为36.6 mm,接近常年同期(35.8 mm)。全国平均气温为11.1℃,较常年同期(10.3℃)偏高0.8℃。10月我国有两次暴雨天气过程,一次是受台风米娜影响,一次是高空槽及低空切变线导致。10月共有4次冷空气活动,分别为2次寒潮天气过程和2次强冷空气过程。我国北部地区出现1次扬沙天气过程。2019年第19号台风米娜于10月1日20:30在浙江舟山普陀沿海登陆。

The main characteristics of the general atmospheric circulation in October 2019 are as follows.Over the Northern Hemisphere,the polar vortex showed a dipole pattern.The circulation presented a four-wave pattern in middle-high latitudes.The western North Pacific subtropical high was distributed in the east-west direction,which was much stronger and westward than normal.The monthly mean precipitation amount was 36.6 mm,which was close to the climatological mean(35.8 mm).The monthly mean temperature was 11.1℃,0.8℃higher than normal(10.3℃).Two torrential rain processes occurred during this month.One was led by Typhoon Mitag,and the other was caused by high-level trough and shear line.There were four cold air processes,two of which were cold-air outbreak processes and the other two were strong cold air processes.One blowing sand weather event occurred in the northern region.Typhoon Mitag landed the coast of Putuo,Zhoushan of Zhejiang Province at 20:30 BT 1 October 2019.