Stratosphere adjusted radiative forcing calculationsin a comprehensive climate model |
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| Authors: | N Stuber R Sausen M Ponater |
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| Institution: | DLR-Institut für Physik der Atmosph?re, Oberpfaffenhofen, Germany, DE
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| Abstract: | Summary A new technical procedure is introduced to determine the stratosphere adjusted radiative forcing at the tropopause in the
framework of the 3-D climate model ECHAM4. However, the procedure appears to be appropriate for other GCMs as well. It allows
to study in a straightforward way the problem of the general usefulness of radiative forcing as a reliable predictor of climate
change. Some examples are given for illustration. It is, once again, confirmed that the climate sensitivity is practically
equal for experiments with increased solar insolation and increased CO2 concentration. However, a higher climate sensitivity is obtained for ozone perturbations with a horizontally or vertically
inhomogeneous distribution. The latter finding is in qualitative agreement with respective results reported in other studies,
whereas the value of the climate sensitivity is exceptionally high in our model. The physical reasons for the unique model
behaviour in the ozone experiments are currently not understood.
Received August 28, 2000 Revised January 2, 2001 |
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