Dynamical connection between tropospheric blockings and stratospheric polar vortex

Details Dynamical connection between tropospheric blockings and stratospheric polar vortex Dynamical connection between tropospheric blockings and stratospheric polar vortex

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3713809c&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 13, CiteID L13809

Physics

4

Atmospheric Processes: Stratosphere/Troposphere Interactions, Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: General Circulation (1223)

Scientific paper

The dynamical connection between Northern Hemisphere blocking events and the variability of the stratospheric polar vortex strength is studied. The analysis is based on the composite time evolution of the energy of baroclinic planetary waves during regional blocking occurrence. During Euro-Atlantic blocking events, an in phase forcing of stationary zonal wavenumber 1 occurs. The enhanced wave amplitude is associated with a stratospheric polar vortex deceleration, which may result, at times, in Sudden Stratospheric Warming (SSW) events of displacement type. Pacific blocking composites reveal an in phase forcing of stationary zonal wavenumber 2. In most cases, the amplification of the wavenumber 2 does not reduce the vortex strength, being even accompanied by a mean vortex acceleration. However, if the amplification of wavenumber 2 is preceded by an amplification of wavenumber 1, the initial vortex deceleration forced by wavenumber 1 may be continued by wavenumber 2, and a SSW event of splitting type may occur.

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