supported by the National Key Research&Development Program of China(2018YFC1506003);the National Natural Science Foundation of China(41925020,41721004);supported by the Natural Environment Research Council(NE/P006779/1,NE/N018001/1)。
Sudden stratospheric warmings(SSWs)are extreme cases of stratospheric polar vortex weakening[1].They are termed minor when a reversal of the stratospheric meridional temperature gradient in the subpolar region at 10 h...