The Effect of Solar Variability in GCMs: Sensitivity to the Model Configuration
Abstract
The impact of 11-year solar cycle variations has been analysed in various GCM studies using wavelength-dependent changes in solar insolation and induced ozone changes. A detailed analysis of GCMs using identical prescribed ozone changes has been performed within the GRIPS solar intercomparison project. The main finding was a consistent temperature response of the models in low latitudes of the upper stratosphere, however considerable seasonal and latitudinal discrepancies occurred between the GCMs. Therefore we focus here on the sensitivity of GCM simulations to the relevant parameters for solar cycle studies. First a short overview of the GRIPS-model results is given. Then we present sensitivity studies performed with the Berlin Climate-MiddleAtmosphere Model (FUB CMAM) that addressed the relative roles of the solar irradiance and the induced ozone variations. In particular the impact of the ozone response will be discussed by comparing models using prescribed ozone changes with newer studies using interactively calculated ozone changes.
- Publication:
-
34th COSPAR Scientific Assembly
- Pub Date:
- 2002
- Bibcode:
- 2002cosp...34E.979L