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Dynamical connection between tropospheric blockings and stratospheric polar vortex

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Castanheira, J. M. and Barriopedro Cepero, David (2010) Dynamical connection between tropospheric blockings and stratospheric polar vortex. Geophysical research letters, 37 . ISSN 0094-8276

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Official URL: http://dx.doi.org/10.1029/2010GL043819




Abstract

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.


Item Type:Article
Additional Information:

© 2010 by the American Geophysical Union.

Uncontrolled Keywords:Weather Regimes, Warmings, Events
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
Sciences > Physics > Atmospheric physics
ID Code:24388
Deposited On:30 Jan 2014 08:31
Last Modified:10 Dec 2018 15:05

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