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Maintenance and development of the ural high and its contribution to severe cold wave activities in winter 2020/21

Atmospheric and Oceanic Science Letters 2022年第2期15卷 54-58页

作者： Jingbei Peng Shuqing Sun Bomin Chen International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Shanghai Climate Center ShanghaiChina

Two successive severe cold waves invaded eastern China from the end of 2020 to early 2021,leading to an extensive,severe,and persistent drop in *** paper investigates the features and formation mechanisms of the two cold *** main results are as follows:(1)An anticlockwise turning of the transverse trough was observed in both cold ***,a broad ridge was maintained over the ural area from mid-December 2020 till mid-January *** breakdown or discontinuous westward shift of the blocking high was observed,which is different from typical cold waves in eastern Asia.(2)The maintenance and strengthening of northerly winds in front of the ural high led to an increase in baroclinicity *** the downstream region,the gradient of the geopotential height contour in the south of the transverse trough rapidly increased and the advection of cold temperature consistently enhanced and advanced *** in turn caused the intensification and southward expansion of the Siberian high.(3)Energy propagation of the quasi-stationary wave was a reason for the development and persistence of the ural *** to the occurrence of the two cold waves,the energy of the low-frequency stationary wave originating from near 0°E(or even to the west)propagated eastwards,which helped the ural ridge intensify and ***,it also contributed to the development of the trough downstream of the ridge and resulted in the anticlockwise turning of the transverse trough,providing a favorable condition for the southward outbreak of cold air.

关键词： Winter 2020/21 Severe cold wave ural ridge Energy dispersion Quasi-stationary wave

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