abstract:A sudden stratospheric warming (SSW) is an event where the polar vortex of westerly winds in the winter hemisphere slows down or even reverses direction over the course of a few days. The change is accompanied by a rise of stratospheric temperature by several tens of kelvins.
Thesemechanismscanlargelyexplainoccurring of abnormalcirculation in the stratosphereandtroposphereduringstratospheric sudden warmingandreturningthentonormal regime.