Photodissociation in the atmosphere of Mars

impact of high resolution, temperature-dependent CO2 cross-section measurements

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

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

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)
JournalJournal of Geophysical Research
Volume98
Issue numberE6
StatePublished - 1993
Externally publishedYes

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Photodissociation
photodissociation
mars
Mars
cross section
atmospheres
atmosphere
high resolution
cross sections
absorption spectrum
temperature
Computational efficiency
wavelength
Temperature
Absorption spectra
inclusions
intervals
absorption spectra
Wavelength
coefficients

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

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abstract = "We find that the adoption of 50 {\AA} 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 {\AA}. -from Authors",
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TY - JOUR

T1 - Photodissociation in the atmosphere of Mars

T2 - impact of high resolution, temperature-dependent CO2 cross-section measurements

AU - Anbar, Ariel

AU - Allen, M.

AU - Nair, H. A.

PY - 1993

Y1 - 1993

N2 - 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

AB - 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

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M3 - Article

VL - 98

JO - Journal of Geophysical Research: Atmospheres

JF - Journal of Geophysical Research: Atmospheres

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