Ursachen der Variabilitaet des Klimasensitivitaetsparameters fuer raeumlich inhomogene Ozonstoerungen

A reduction of anthropogenic greenhouse gas emissions is a condition precedent for implementing the framework convention on climate change. ''Metrics'' allow for a comparison of different emissions with regard to their potential effects on global climate and, hence, are a prerequisite for political decisions. Currently ''radiative forcing'' is the most common metric: Global, annual mean radiative forcing resulting from some perturbation of the climate system is proportional to equilibrium surface temperature response. The coefficient of proportionality, #lambda#, is called the ''climate sensitivity parameter''. However, several studies have indicated that for spatially inhomogeneous perturbations #lambda# can no longer be regarded as a constant. This doctoral thesis examines the reasons for the non-linear relationship between radiative forcing and climate response. The response to several idealized ozone perturbations has been analysed. The equilibrium response of some radiatively relevant parameters features a characteristic signature, implying that the respective feedback mechanisms act quite differently in the various experiments. Accordingly, equality of radiative forcing is not sufficient to guarantee comparability of the gross effect of all feedback mechanisms. Analysis shows that the variability of #lambda# is largely due to the very different strength of stratospheric water vapor and sea-ice albedo feedback for the various experiments. (orig.)SIGLEAvailable from TIB Hannover: RN 437(03-03) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman