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EP: Fachverband Extraterrestrische Physik
EP 11: Near-Earth Space I
EP 11.2: Talk
Thursday, March 23, 2023, 14:30–14:45, ZEU/0160
Comparison of D-region ion-chemistry in ExoTIC and EMAC with MIPAS observations — •Monali Borthakur1, Miriam Sinnhuber1, Thomas von Clarmann1, Gabriele Stiller1, and Bernd Funke2 — 1Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain
Energetic particle precipitation (EPP) and ion chemistry affect the neutral composition of the polar middle atmosphere. For example, production of odd nitrogen and odd hydrogen during strong events like solar proton events can decrease ozone. However, the standard ion chemistry parameterisation used in atmospheric models neglects the effects on some important species. Studies have also shown that the increase of some species measured during solar proton events (SPEs) cannot be reproduced using the standard parameterisation of HOx and NOx production, while models considering D-region ion chemistry in detail agree better with the observations. Here we present results with D-region ion-chemistry in a 1D model ExoTIC and 3D model EMAC, which includes a set of lower ionosphere (D-region) chemistry: 413 reactions of 46 positive ions and 28 negative ions. Using AISSTORM ionisation rates, ExoTIC and EMAC simulations in the Northern polar region are compared with MIPAS satellite observations for the Halloween SPE of 2003. A focus is on the analysis of the chemical composition changes of different species due to the chlorine ion-chemistry in EMAC.