Berlin 2014 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 5: Postersitzung

EP 5.7: Poster

Tuesday, March 18, 2014, 16:30–18:30, DO24 Foyer

Dynamical response of middle atmosphere to changed ozone climatology: results from coupled chemistry-climate model (EMAC) — •Khalil Karami, Stefan Versick, and Miriam Sinnhuber — Karlsruhe Institute of Technology- Institute for Meteorology and Climate Research

Knowledge about natural variability of the climate is crucially important to understand the observed climate change. On the other hand, in order to accurately determine the role of anthropogenic activities on climate change, we need to distinguish between contributions of Man-made and natural sources on climate variability. The sun, as a variable star, not only is the source of energy to climate system, but also is one of the most important sources of natural variability of Earth's climate system. In general, climate response to solar variation is divided into two broad categories, directly affecting tropospheric processes (bottom up), or indirectly due to coupling with stratospheric ozone and radiative heating (top-down).The impact of changed ozone values on middle atmospheric dynamics and temperature is the primary goal of the current study. The Chemistry-Climate Model ECHAM/MESSy Atmospheric Chemistry (EMAC), version 2.42, with FUBRad shortwave radiation scheme is used to investigate the impact of changed ozone values on stratospheric temperatures and wind fields. Several model runs were carried out over a period of 50 years with a free-running version of the model driven by a prescribed ozone climatology differing slightly in the different model runs to investigate the impact of ozone changes in different altitudes and latitude regions.