Analysis of the February 2020 Atmospheric Circulation and Weather
The main characteristics of the general atmospheric circulation in February 2020 are as follows. There were two polar vortex centers in the Northern Hemisphere and they were stronger than normal. The circulation at middlehigh latitudes of the Eurasian showed a threewave pattern, and the general circulation is of latitudinal type with small longitude. The Western Pacific subtropical high was stronger than that of the climatological normal, and the Bay of Bengal trough was more active than normal in late February. During this month, the frequency of cold air in China was less than that of average year, and there was one nationwide cold wave process. The monthly mean temperature was -0.1℃, higher than normal by 1.6℃. The monthly mean precipitation was 3.2 mm, 18% higher than normal. During the first half of February, continues foghaze weather appeared in the central and eastern part of China. Sanddust weather appeared in Northwest China firstly this year.