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Article overview
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Effect of O3 on the atmospheric temperature structure of early Mars | | P. von Paris
; F. Selsis
; M. Godolt
; J.L. Grenfell
; B. Stracke
; H. Rauer
; | | Date: |
28 May 2015 | | Abstract: | Ozone is an important radiative trace gas in the Earth’s atmosphere. The
presence of ozone can significantly influence the thermal structure of an
atmosphere, and by this e.g. cloud formation. Photochemical studies suggest
that ozone can form in carbon dioxide-rich atmospheres. We investigate the
effect of ozone on the temperature structure of simulated early Martian
atmospheres. With a 1D radiative-convective model, we calculate
temperature-pressure profiles for a 1 bar carbon dioxide atmosphere. Ozone
profiles are fixed, parameterized profiles. We vary the location of the ozone
layer maximum and the concentration at this maximum. The maximum is placed at
different pressure levels in the upper and middle atmosphere (1-10 mbar).
Results suggest that the impact of ozone on surface temperatures is relatively
small. However, the planetary albedo significantly decreases at large ozone
concentrations. Throughout the middle and upper atmospheres, temperatures
increase upon introducing ozone due to strong UV absorption. This heating of
the middle atmosphere strongly reduces the zone of carbon dioxide condensation,
hence the potential formation of carbon dioxide clouds. For high ozone
concentrations, the formation of carbon dioxide clouds is inhibited in the
entire atmosphere. In addition, due to the heating of the middle atmosphere,
the cold trap is located at increasingly higher pressures when increasing
ozone. This leads to wetter stratospheres hence might increase water loss rates
on early Mars. However, increased stratospheric H2O would lead to more HOx,
which could efficiently destroy ozone. This result emphasizes the need for
consistent climate-chemistry calculations to assess the feedback between
temperature structure, water content and ozone chemistry. Furthermore,
convection is inhibited at high ozone amounts, leading to a stably stratified
atmosphere. | | Source: | arXiv, 1505.7713 | | Services: | Forum | Review | PDF | Favorites | |
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