Berlin 2005 – wissenschaftliches Programm
EP 2.9: Vortrag
Freitag, 4. März 2005, 17:00–17:15, TU BH349
The impact of solar activity modulated galactic cosmic rays (GCR) on clouds — •Susanne Rohs1, Gebhard Günther1, Bernd Kärcher2, Martina Krämer1, Reinhold Spang1, Pi-Huan Wang3, and Cornelius Schiller1 — 1Forschungszentrum Jülich GmbH, ICG-1 (Institut für Stratosphärische Chemie), D-52425 Jülich — 2Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Physik der Atmosphäre, Postfach 1116, D-82230 Weßling — 3STC/NASA-LaRC, MS 910, Hampton, VA 23681-2199
Since years the scientific community discusses controversially the solar activity modulated coupling between galactic cosmic rays (GCRs) and cloudiness, which by itself affects the natural climate variability. To further evaluate this GCR-cloud link we have submitted the proposal SAtellite and model studies of GAlactic cosmic rays and Clouds modulated by solar activity (SAGACITY) as part of the dfg Schwerpunktprogram CAWSES. SAGACITY focus on satellite observations of cirrus clouds, both in the long-term data record of the SAGE-2 satellite experiment as well as for episodes of solar proton events and the subsequent Forbush decreases using data of the MIPAS instrument onboard ENVISAT. Additionally we plan to develop appropriate nucleation parameterisations to be implemented in the chemical transport model CLaMS for theoretical studies of the GCR-cloud link. Here, the observed correlations between GCRs and clouds and the discussed mechanism how GCRs could influence cloud microphysics will be reviewed. Further, we present our proposed activities during SAGACITY.