Tropospheric and stratospheric aspects of the Arctic Oscillation

Details Tropospheric and stratospheric aspects of the Arctic Oscillation Tropospheric and stratospheric aspects of the Arctic Oscillation

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3349k&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 20, p. 3349-3352

Physics

19

Global Change, Meteorology And Atmospheric Dynamics, Meteorology And Atmospheric Dynamics: General Circulation, Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics

Scientific paper

The role of the stratospheric variability in the Arctic Oscillation (AO) is investigated by selecting 18 large month-to-month variation events. It is shown that although tropospheric features are very similar, the vertical structure of the AO differs considerably depending on whether it is initiated by a downward propagation of zonal-mean zonal wind anomalies from the stratosphere (type S) or it is produced within the troposphere (type T). Type S events preferentially occur during February and March, while type T events are seen during November and December. The results of the analysis suggest that diverse aspects of the AO-related variability can more easily be understood as coupling and uncoupling of stratospheric and tropospheric modes of variability.

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