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studium:themen_fuer_masterarbeiten_theo [2018/06/29 08:52]
keil [Sudden stratospheric warmings and stratosphere-troposphere coupling]
studium:themen_fuer_masterarbeiten_theo [2018/06/29 08:54] (aktuell)
keil [Sudden stratospheric warmings and stratosphere-troposphere coupling]
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 ====Sudden stratospheric warmings and stratosphere-troposphere coupling==== ====Sudden stratospheric warmings and stratosphere-troposphere coupling====
  
-The stratospheric circulation in winter is dominated by a strong cyclonic vortex over the pole. This polar vortex is caused by radiative cooling due to polar night. However, upward propagating planetary waves frequently perturb the vortex in terms of both position and strength. For sufficiently strong planetary wave forcing, these disturbances can grow enough to destroy the polar vortex as a well-organized entity. These abrupt transitions in the hemispheric-scale stratospheric circulation are usually associated with a strong warming of the polar stratosphere and are thus often called //[[href=https://​www.meteorologie.lmu.de/​~Thomas.Birner/​ssw.html | sudden stratospheric warmings (SSWs)]]//. Furthermore,​ SSWs tend to produce circulation anomalies at the surface.+The stratospheric circulation in winter is dominated by a strong cyclonic vortex over the pole. This polar vortex is caused by radiative cooling due to polar night. However, upward propagating planetary waves frequently perturb the vortex in terms of both position and strength. For sufficiently strong planetary wave forcing, these disturbances can grow enough to destroy the polar vortex as a well-organized entity. These abrupt transitions in the hemispheric-scale stratospheric circulation are usually associated with a strong warming of the polar stratosphere and are thus often called //​[[https://​www.meteorologie.lmu.de/​~Thomas.Birner/​ssw.html | sudden stratospheric warmings (SSWs)]]//. Furthermore,​ SSWs tend to produce circulation anomalies at the surface.
  
 In this Master project we will explore the dynamical evolution leading up to and following SSW events based on meteorological reanalysis data and climate model output. In this Master project we will explore the dynamical evolution leading up to and following SSW events based on meteorological reanalysis data and climate model output.