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Stratospheric Responses to the 11-year Solar Cycle in MAECHAM5 with and without Ocean Coupling

  • S. Misios
  • H. Schmidt
Conference paper
Part of the Springer Atmospheric Sciences book series (SPRINGERATMO)

Abstract

The current generation of general circulation models (GCMs) faces major difficulties in reproducing, both qualitatively and quantitatively, the observed stratospheric response to the 11-year solar cycle. Because the majority of the previous studies used atmosphere-only GCMs without ocean coupling, it has been suggested that the inclusion of ocean dynamics may improve the simulated solar cycle signals. Our ensemble simulations with a coupled atmosphere-ocean GCM shows no indication that the ocean coupling alters significantly the solar cycle signals in the stratosphere. Although a measurable warming in the tropical oceans during solar maxima is detected in the coupled ensemble, its amplitude is too weak to affect the stratosphere. As such, the simulated temperature and zonal-mean zonal wind changes in the stratosphere are qualitatively similar both in the coupled and uncoupled ensembles. The simulated tropospheric response to the solar cycle forcing, however, differs significantly between the ensemble with and without ocean coupling.

Keywords

Solar Cycle Zonal Wind Ocean Coupling Zonal Wind Anomaly Solar Spectral Irradiance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was funded by DFG under the ARTOS project.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Max Planck Institute for MeteorologyHamburgGermany
  2. 2.International Max Planck Research School on Earth System ModellingHamburgGermany

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