Tropospheric ozone as a UV shield on the early Earth

Details Tropospheric ozone as a UV shield on the early Earth Tropospheric ozone as a UV shield on the early Earth

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..731g&link_type=abstract

European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht

Computer Science

Scientific paper

Model runs suggest that the troposphere of the Early Earth with 1% present day oxygen was much thicker than for modern day runs and it contributed much more to UV-shielding via ozone produced from the smog mechanism. A similar result was suggested in Grenfell et al. (2006) but the results presented here are for more general, global conditions and apply a more sophisticated model. The troposphere is thicker for the Early Earth runs because the cold trap moves upwards. This occurs because the lowered oxygen leads to supressed ozone which means weaker ozone heating. So, to overcome the effect of adiabatic cooling with increasing altitude the cold trap moves up to higher altitudes where UV fluxes (hence ozone heating) are stronger. We present temperature profiles and ozone column amounts (split into their tropospheric and stratospheric components) for modern day and Early Earth model runs and we discuss variables related to habitability such as surface UV exposure and temperature.

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