München 2019 – scientific programme
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UP: Fachverband Umweltphysik
UP 10: Poster session
UP 10.4: Poster
Thursday, March 21, 2019, 16:30–18:30, HS 22
Potential Arctic Cirrus Cloud Feedbacks on the Composition of the UTLS — •Florian Haenel1, Wolfgang Woiwode1, Michael Höpfner1, Roland Ruhnke1, Farahnaz Khosrawi1, Oliver Kirner2, Felix Friedl-Vallon1, Sören Johansson1, Anne Kleinert1, Jennifer Schröter1, and Björn-Martin Sinnhuber1 — 1Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Karlsruhe, Germany — 2Karlsruhe Institute of Technology, Steinbuch Centre for Computing, Karlsruhe, Germany
The composition of the UTLS (upper troposphere/lower stratosphere) plays a key role in climate change, as radiative forcing of the atmosphere is sensitive to abundances of greenhouse gases in this region. Therefore, a correct representation of processes and feedbacks in the UTLS in atmospheric models is crucial. Cirrus clouds in the UTLS are directly capable of redistributing water vapour (H2O) and nitric acid (HNO3). This may furthermore lead to changes in the vertical distributions of the greenhouse gases methane and ozone. The role of high latitude and particularly Arctic cirrus clouds is not well understood. We retrieve vertical profiles of these trace gases measured by the airborne infrared limb sounder GLORIA during the POLSTRACC campaign in the vicinity of cirrus clouds. Comparison to the measurements and sensitivity studies with simulations by the high-resolution forecast model ICON-ART and the climate-chemistry model EMAC will gain insight into the performance of the models and the significance of these processes on the composition of the UTLS.