Adsorption of HOx on aerosol surfaces: implications for the atmosphere of Mars

A. D. Anbar, M. T. Leu, H. A. Nair, Y. L. Yung

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16 Scopus citations

Abstract

We find that adsorption of HO2 on dust (γHO2≥0.01), or ice near 30 km (γHO2 ≥0.1), can deplete OH abundances in the lower atmosphere by 10% or more. Such depletions approach those obtained by lowering the water vapor abundance by an order of magnitude below the global average observed by Viking (~ 25%). Since the oxidation of CO is catalyzed by HOx in the lower atmosphere via the reaction CO + OH → CO2 + H, loss of OH due to adsorption of HO2 on dust or ice at low altitudes could have a significant effect on the ratio CO:CO2. The adsorption of H on ice at 50 km (γH≥ 0.01) can result in even larger OH depletions. However, this effect is localized to altitudes >40 km, where CO oxidation is relatively unimportant. Laboratory data suggest that γHO2 ~ 0.01 is a reasonable estimate for adsorption on dust. -from Authors

Original languageEnglish (US)
Pages (from-to)10,933-10,940
JournalJournal of geophysical research
Volume98
Issue numberE6
StatePublished - Jan 1 1993
Externally publishedYes

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ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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