Modulating Effects of Planetary Wave 3 on a Stratospheric Sudden Warming Event in 2005

Modulating Effects of Planetary Wave 3 on a Stratospheric Sudden Warming Event in 2005 AbstractThe Eliassen–Palm flux (EPF) and Plumb’s wave activity flux (WAF) were computed, using ERA-Interim reanalysis data, to analyze the influence of planetary wave 3 on a stratospheric sudden warming event from 17 February to 15 March 2005 (SSW05). It was found: (1) SSW05 consisted of three stages: a prior minor warming (MnW05); a late final warming (FW05); and a warming stagnation, between MnW05 and FW05. (2) The wave 3 first decreased total upward EPFs by more than 30% at 100 hPa, resulting in the warming stagnation, and then increased upward EPFs by greater than 50%, leading to FW05. (3) The anomalies of wave-3 activity fluxes were associated with the pattern of Atlantic blocking high in the latter two stages. The interactions between the wave 3 and wave 1 partitioned the zonal upward channel of total wave activity fluxes from one longitudinal region into two longitudinal regions and affected SSW05. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Atmospheric Sciences American Meteorological Society

Modulating Effects of Planetary Wave 3 on a Stratospheric Sudden Warming Event in 2005

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0469
eISSN
1520-0469
D.O.I.
10.1175/JAS-D-16-0065.1
Publisher site
See Article on Publisher Site

Abstract

AbstractThe Eliassen–Palm flux (EPF) and Plumb’s wave activity flux (WAF) were computed, using ERA-Interim reanalysis data, to analyze the influence of planetary wave 3 on a stratospheric sudden warming event from 17 February to 15 March 2005 (SSW05). It was found: (1) SSW05 consisted of three stages: a prior minor warming (MnW05); a late final warming (FW05); and a warming stagnation, between MnW05 and FW05. (2) The wave 3 first decreased total upward EPFs by more than 30% at 100 hPa, resulting in the warming stagnation, and then increased upward EPFs by greater than 50%, leading to FW05. (3) The anomalies of wave-3 activity fluxes were associated with the pattern of Atlantic blocking high in the latter two stages. The interactions between the wave 3 and wave 1 partitioned the zonal upward channel of total wave activity fluxes from one longitudinal region into two longitudinal regions and affected SSW05.

Journal

Journal of the Atmospheric SciencesAmerican Meteorological Society

Published: Mar 3, 2017

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