ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 47 Issue 3 > 2021,47(3):381-388. DOI:10.7519/j.issn.1000-0526.2021.03.011 Prev Next
Analysis of the December 2020 Atmospheric Circulation and Weather
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Abstract:
The main characteristics of the general atmospheric circulation in December 2020 are as follows. Polar vortex in the Northern Hemisphere had a dipole distribution, the circulation presented a three-wave pattern in middle-high latitudes. The atmospheric circulation presented a great meridionality in mid-latitudes in Eurasia. The East Asian trough behaved strongly and the southern branch trough was weaker in this month. The monthly mean precipitation over China was 5.8 mm, 45.3 % less than normal (10.5 mm). The national monthly average temperature was -3.9℃, 0.7℃ lower than the normal. Totally, there were two strong cold air processes, two precipitation processes and two large-scale fog-haze events in this month. During 27-31 December, most of China suffered from the cold surge characterized by a sharply drop in temperatures and extremely wide areas being impacted. The lowest temperature in many places exceeded the historical extreme values.
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