Effect of O3 on the atmospheric temperature structure of early Mars

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.

arXiv commentaccepted for publication in Icarus (28.5.2015), 29 pages, 12 figures, 4 tables

References in corpus (30)

• Evolution of the Solar Activity over Time and Effects on Planetary Atmospheres: I. High-energy Irradiances (1-1700 A)
• Biosignatures from Earth-Like Planets Around M Dwarfs
• Global modelling of the early Martian climate under a denser CO2 atmosphere: Water cycle and ice evolution
• 3D modelling of the early Martian Climate under a denser CO2 atmosphere: Temperatures and CO2 ice clouds
• Transits of Earth-Like Planets
• Warming early Mars with CO2 and H2
• Photochemistry in Terrestrial Exoplanet Atmospheres I: Photochemistry Model and Benchmark Cases
• Spectral Evolution of an Earth-Like Planet
• Abiotic oxygen-dominated atmospheres on terrestrial habitable zone planets
• Abiotic Ozone and Oxygen in Atmospheres Similar to Prebiotic Earth
• High Stellar FUV/NUV Ratio and Oxygen Contents in the Atmospheres of Potentially Habitable Planets
• Outgassing History and Escape of the Martian Atmosphere and Water Inventory
• Abiotic formation of O2 and O3 in high-CO2 terrestrial atmospheres
• The Response of Atmospheric Chemistry on Earthlike Planets around F, G and K Stars to Small Variations in Orbital Distance
• Low paleopressure of the Martian atmosphere estimated from the size distribution of ancient craters
• Warming the early Earth - CO2 reconsidered
• Biomarker Response to Galactic Cosmic Ray-Induced NOx and the Methane Greenhouse Effect in the Atmosphere of an Earthlike Planet Orbiting an M-Dwarf Star
• The extrasolar planet GL 581 d: A potentially habitable planet?
• Sensitivity of Biosignatures on Earth-like Planets orbiting in the Habitable Zone of Cool M-Dwarf Stars to varying Stellar UV Radiation and Surface Biomass Emissions
• Spectral features of Earth-like planets and their detectability at different orbital distances around F, G, and K-type stars
• Potential Biosignatures in Super-Earth Atmospheres II. Photochemical Responses
• Model Spectra of the First Potentially Habitable Super-Earth - Gl581d
• N2-associated surface warming on early Mars
• Characterization of potentially habitable planets: Retrieval of atmospheric and planetary properties from emission spectra
• Clouds in the atmospheres of extrasolar planets. IV. On the scattering greenhouse effect of CO2 ice particles: Numerical radiative transfer studies
• The dependence of the ice-albedo feedback on atmospheric properties
• Clouds in the atmospheres of extrasolar planets. III. Impact of low and high-level clouds on the reflection spectra of Earth-like planets
• The Transit Spectra of Earth and Jupiter
• Atmospheric constraints for the CO2 partial pressure on terrestrial planets near the outer edge of the habitable zone
• Atmospheric studies of habitability in the Gliese 581 system

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• Limitation of atmospheric composition by combustion-explosion in exoplanetary atmospheres
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