Berlin 2005 – wissenschaftliches Programm

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EP: Extraterrestrische Physik

EP 2: CAWSES

EP 2.4: Fachvortrag

Freitag, 4. März 2005, 15:10–15:30, TU BH349

Modelling 11-Year Solar Cycle Variations in the Stratosphere — •Ulrike Langematz¹, Katja Matthes², and J. Lee Grenfell³ — ¹Institut für Meteorologie, Freie Universität Berlin — ²National Center for Atmospheric Research, USA — ³DLR Institut für Verkehrsforschung, Berlin

The impact of 11-year solar cycle variations in the stratosphere has been studied in various general circulation models using spectral solar insolation and modified ozone climatologies for solar maximum and solar minimum conditions. An ensemble analysis of these studies revealed a consistent positive temperature signal of the upper stratosphere at low latitudes for solar maximum conditions, but also large seasonal and latitudinal differences between the models, particulary in northern winter. The simulated responses were generally weaker than those derived from observational data. Due to recent developments of climate-chemistry models, new simulations of the 11-year solar cycle were able to consider directly the ozone response to the solar irradiance changes by photochemical and transport processes.

The purpose of this talk is to give an overview of the current status of modelling the effects of the 11-year solar cycle in the Earth’s atmosphere. This will include new aspects to be considered in the future, e.g., the impact of 11-year variations in solar particle precipitation and the solar signal in the troposphere.