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- W2160202036 abstract "We present the first three‐dimensional model simulations of ozone on Mars. The model couples a state‐of‐the‐art gas‐phase photochemical package to the general circulation model developed at Laboratoire de Météorologie Dynamique (LMD). The results do not contradict the classical picture of a global anticorrelation between the ozone (O 3 ) and water vapor columns. However, the quantitative approach shows significant departures from this relationship, related to substantial orbital variations in the O 3 vertical distribution. Over the period L s = 180°–330°, low‐latitude to midlatitude O 3 is essentially confined below 20 km, has a weak diurnal cycle, and is largely modulated by topography. During the rest of the year ( L s = 330°–180°) the model predicts the formation of an O 3 layer at 25–70 km altitude, characterized by nighttime densities about one order of magnitude larger than during the day. Throughout the year, high‐latitude O 3 peaks near the surface and reaches maximum integrated amounts (∼40 μm‐atm) in the winter polar vortex, with considerable (30 to 50%) dynamically induced day‐to‐day variations. The most stringent comparison to date with O 3 observational data reveals contrasted results. A good quantitative agreement is found in the postperihelion period ( L s = 290°–10°), but the model fails to reproduce O 3 columns as large as those measured near aphelion ( L s = 61°–67°). Current uncertainties in absorption cross sections and gas‐phase kinetics data do not seem to provide credible explanations to explain this discrepancy, which may suggest the existence of heterogeneous processes." @default.
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- W2160202036 date "2004-07-01" @default.
- W2160202036 modified "2023-10-18" @default.
- W2160202036 title "Three-dimensional modeling of ozone on Mars" @default.
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- W2160202036 doi "https://doi.org/10.1029/2004je002268" @default.
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