Ko pplung von Dy namik und A tmosphärischer C hemie in der S tratosphäre Investigation of mutual influences of greenhouse effect and changes of dynamic and chemical processes in the UT/LS employing model simulations and observations M. Dameris, V. Grewe, M. Ponater, C. Schnadt, V. Eyring, F. Mager, S. Matthes, A. Stenke, D. Lamago Institut für Physik der Atmosphäre, DLR Oberpfaffenhofen, D Wessling Publications (peer reviewed) Austin, J., D. Shindell, S.R. Beagley, C. Brühl, M. Dameris, E. Manzini, T. Nagashima, P. Newman, S. Pawson, G. Pitari, E. Rozanov, C. Schnadt, and T.G. Shepherd, Uncertainties and assessments of chemistry-climate models of the stratosphere, Atmos. Chem. Phys., 3, 1-27, Dameris, M., C. Appenzeller, P. Forster, U. Langematz, G. Pitari, R. Ruhnke, J. Staehelin, W. Steinbrecht, The effect of changes in climate on stratospheric ozone, in: Ozone-Climate Interaction, Air Pollution Research Report No. 81, European Commission, EUR 20623, ISBN , 53-71, Lamago, D., M. Dameris, C. Schnadt, V. Eyring, and C. Brühl, Impact of large solar zenith angles on lower stratospheric dynamical and chemical processes in a coupled chemistry-climate model, Atmos. Chem. Phys., 3, , Reichler, T., M. Dameris, and R. Sausen, Determining the tropopause height from gridded data, Geophys. Res. Lett., 30(20), 2042, doi: /2003GL018240, Schnadt, C., M. Dameris, M. Ponater, R. Hein, V. Grewe, and B. Steil, Interaction of atmospheric chemistry and climate and its impact on stratospheric ozone, Climate Dynamics, 18, , Schnadt, C. and M. Dameris, Relationship between North Atlantic Oscillation changes and an accelerated recovery of stratospheric ozone in the northern hemisphere, Geophys. Res. Lett., 30, 1487, doi: /2003GL017006, Introduction The investigations carried out in this sub-project employed results of long-term model simulations with the fully coupled chemistry-climate model ECHAM4.L39(DLR)/CHEM (E39/C). Several time-slice experiments have been analysed (1960, 1980, 1990, 2015) as well as a transient simulation which covers the years from 1960 to Model results have been evaluated with respective observations to detect and to quantify the importance of the interaction of dynamical, physical and chemical processes. Mostly all investigations have been carried out in close co-operations with the KODYACS partners. Contact: Priv.-Doz. Dr. Martin Dameris - phone: fax: Impact of large solar zenith angles (SZA) for the dynamics and chemistry of the stratosphere Differences in total ozone, tempera- ture,and activated chlorine between two model simulations with E39/C, which consider SZA up to 87.5° and 93°, respectively. Units: DU, K, ppbv. Positive values indicate higher values in the simulation which allows SZA up to 93°. (Lamago et al., 2003) Ozone recovery Temporal development of total ozone (in DU) derived from TOMS and transient and time-slice simulations employing different CCMs. Left: SH; right: NH. (Austin et al., 2003) Wave-frequency analysisImpact of SST on stratospheric dynamics model year Left: NAO composite study for DJF. Differences of heat fluxes (pos. NAO index minus neg. NAO index) for stationary and transient eddies. Right: Temporal development of NAO index in E39/C time-slice experiments. (Schnadt and Dameris, 2003) ERA E39/C [v*T*] (K m/s) [v'T'] (K m/s) Results of transient model simulation with E39/C Description of transient run with E39/C Monthly mean zonal mean wind velocity [m/s] at the equator pressure [hPa] O 3 T ClO x