Abstract
AbstractThe anomalous strengthening of the stratospheric Aleutian High during the early boreal winter of 2016/2017 led to a rare Canadian stratospheric warming (CSW) event, during which the extent of the wind reversal in the Arctic region is the strongest among CSWs since 2001. Unlike sudden stratospheric warmings, the polar vortex during this CSW is merely distorted, not displaced off the pole or split into two pieces, and the polar mean temperature only has a modest increase of a few kelvins. Using the Aura satellite Microwave Limb Sounder measurements, an exceptionally strong 12‐day wave (12DW) with westward zonal wavenumber 1 is captured in the mesospheric water vapor mixing ratio during the recovery phase of this CSW. Further diagnostic analysis suggests that the baroclinic/barotropic instability related to this CSW triggers the 12DW in the Arctic stratosphere, and meridional advection plays a leading role in the modulation of 12DW on mesospheric water vapor.
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