The global distribution of O3 on mars

Abstract Models are developed to describe the photochemistry of ozone on Mars. Catalytic reactions involving H, OH and HO 2 play a major role at low latitudes where they ensure a vertical column density for O 3 of less than 2 × 10 −4 cm atm. The source for odd hydrogen (H + OH + HO 2 ) is relatively smaller at high latitudes in winter due to the small concentrations of H 2 O present there at that time. Odd hydrogen is also efficiently removed from the high-latitude winter atmosphere by condensation of H 2 O 2 . The role of catalytic chemistry is reduced accordingly and the vertical column density of O 3 may be as large as 5.7 × 10 −3 cm atm in accord with earlier observations carried out by Barth and co-workers with instruments on Mariner 9.

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