Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991plas.rept..167k&link_type=abstract
In NASA, Washington, Reports of Planetary Astronomy, 1991 p 167 (SEE N92-12792 03-89)
Astronomy and Astrophysics
Astronomy
Absorption Spectra, Atmospheric Composition, Heterodyning, Infrared Radiation, Infrared Spectroscopy, Infrared Telescopes, Mariner 7 Space Probe, Mars Atmosphere, Ozone, Ozonometry, Abundance, Carbon Dioxide, Fitting, Line Spectra, Photochemical Reactions, Polar Caps, Radiative Transfer, Temperature Profiles, Zenith
Scientific paper
The global distribution of ozone in the atmosphere of Mars was determined from Doppler-limited infrared heterodyne spectroscopy measurements at the NASA Infrared Telescope Facility (IRTF) facility during June 3-7, 1988. Mars spectra near two O3 lines arising from the v3 band near 1031.45 cm (-1) were used. The lines were Doppler shifted out of the strong terrestrial ozone absorption spectrum and its effect was removed. Ozone measurements were obtained at eight beam positions over a range of latitudes and local solar zenith angles. The beam size of the planet was 1.4 arcsec. A Martian CO2 line appeared in the spectra and was inverted to retrieve local temperature profiles. Using these temperature profiles, the total ozone column abundance at each position was retrieved by fitting the measured line with synthetic spectra generated by a radiative transfer program. The only previous measurement of ozone at this season was made above the South polar cap by Mariner 7 and revealed an abundance of 10 micron-atm. However, the retrieved O3 column abundances from this investigation are less than 2.2 micron-atm at all positions sampled. These results are consistent with mid-spring abundances predicted by photochemical models of Liu and Donahue, and Shimazaki and Shimizu.
Espenak Fred
Kostiuk Theodor,
Mumma Michael J.
Zipoy David
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