Photodissociation in the atmosphere of Mars: impact of high resolution, temperature-dependent CO2 cross-section measurements

A. D. Anbar, M. Allen, H. A. Nair

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


We find that the adoption of 50 Å intervals for the purpose of computational efficiency results in errors in the calculated values for photodissociation of CO2, H2O, and O2 which are generally ≤ 10%, but as large as 20% in some instances. The inclusion of temperature-dependent CO2 cross-sections is shown to lead to a decrease in the diurnally averaged rate of CO2 photodissociation as large as 33% at some altitudes, and increases of as much as 950% and 80% in the photodissociation rate coefficients of H2O and O2, respectively. The actual magnitude of the changes depends on the assumptions used to model the CO2 absorption spectrum at temperatures lower than the available measurements, and at wavelengths longward of 1970 Å. -from Authors

Original languageEnglish (US)
Pages (from-to)10,925-10,931
JournalJournal of geophysical research
Issue numberE6
StatePublished - 1993
Externally publishedYes

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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