The anomalous Arctic lower stratospheric polar vortex of 1992-1993

Details The anomalous Arctic lower stratospheric polar vortex of 1992-1993 The anomalous Arctic lower stratospheric polar vortex of 1992-1993

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2405m&link_type=abstract

Geophysical Research Letters, Volume 21, Issue 22, p. 2405-2408

Physics

41

Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Meteorology And Atmospheric Dynamics: Polar Meteorology, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry

Scientific paper

Potential vorticity (PV) gradients defining the lower stratospheric vortex during the 1992-1993 winter were anomalously strong and persistent compared to those during the last 16 Arctic winters. For ~3 months PV gradients were closer to typical Antarctic values than to most Arctic values. Air motion diagnostics computed for 3-dimensional air parcel trajectories confirm that the 1992-1993 Arctic lower stratospheric vortex was substantially more isolated than is typical. Such isolation will delay and reduce the export of the higher ozone typical of the winter lower stratospheric vortex to mid-latitudes. This may have contributed to the record-low total ozone amounts observed in northern mid-latitudes in 1993.

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