The main characteristics of the general circulation of atmosphere in November 2023 are as fol-lows.There were three polar vortex centers in the Northern Hemisphere,and the intensity of polar vorte-xes was significantly stronger than normal.The mid-high latitude circulation was distributed in the pattern of four troughs and four ridges.The mid-high latitude circulation in Asia was in the west-high and east-low pattern overall,but the East Asian trough was weaker than that in the same period of normal year,and the western Pacific subtropical high was stronger.In November,the national monthly mean temperature was 0.5℃ higher than usual(3.3℃)and the national monthly mean precipitation increased by 9％relative to normal(20.2 mm).The regions having received much more precipitation included Inner Mongolia,North-east China,southern part of North China and northern part of Huanghuai Area,Especially,some parts of Northeast China saw the precipitation surpass the recorded maximum value for the same time period.Dur-ing this month,cold airs were more active and frequent,making the atmospheric dispersion conditions im-proved overall with less fog-haze weather seen in the central and eastern parts of China.In addition,two cold wave processes occurred in the northern part of China.
维普
万方数据