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EP: Fachverband Extraterrestrische Physik
EP 7: Exoplanets and Astrobiology II
EP 7.3: Vortrag
Donnerstag, 2. September 2021, 14:30–14:45, H8
Response of a coupled climate-chemistry column model to step by step increases in insolation: Towards the simulation of a giant steam atmosphere at the close of the magma ocean period — •Alexander Esau1, Fabian Wunderlich2, John L. Grenfell2, and Heike Rauer1,2,3 — 1Centre for Astronomy and Astrophysics (ZAA), Berlin Institute of Technology (TUB), Hardenbergstr., 10623 Berlin, Germany — 2Department of Extrasolar Planets and Atmospheres (EPA), Institute for Planetary Research (PF), German Aerospace Centre (DLR), Rutherfordstr. 2, 12489 Berlin, Germany — 3Institut für Geologische Wissenschaften, Freie Universität Berlin, Malteserstr. 74-100, 12249 Berlin, Germany
Using the coupled climate-photochemical column model 1D-TERRA, we perform 11 scenarios varying the net, top-of-atmosphere incoming insolation (S) with values of S = 1 to S = 1.5. Results suggest surface temperature increases to 356 K mainly due to increasing insolation and associated greenhouse heating from enhanced water vapor via ocean evaporation. Surface pressure increases as a result from 1.02 bar (control) up to 1.54 bar in scenario 11 with the highest insolation. Near the tropopause, results suggest a warming of the cold trap and a weakening of the temperature inversion with increasing insolation. The cold trap and temperature inversion are no longer evident in the lower stratosphere in scenario 11, where a penetration of H2O into the stratosphere occurs consistent with tropospheric greenhouse heating and weakened upwards vertical mixing. We plan to investigate the photochemical and H-escape responses with our extensive chemical scheme.