Polar warming in the middle atmosphere of Mars

Details Polar warming in the middle atmosphere of Mars Polar warming in the middle atmosphere of Mars

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...66..366d&link_type=abstract

Icarus (ISSN 0019-1035), vol. 66, May 1986, p. 366-379. NASA-supported research.

Computer Science

30

Atmospheric Heating, Atmospheric Temperature, Mars Atmosphere, Middle Atmosphere, Polar Cap Absorption, Carbon Dioxide, Emission Spectra, Laser Spectroscopy, Line Spectra, Nonthermal Radiation, Optical Heterodyning, Two Dimensional Models, Vertical Distribution

Scientific paper

During the 1984 Mars opposition, ground-based laser heterodyne spectroscopy was obtained for the nonthermal core emission of the 10.33-micron R(8) and 10.72-micron P(32) lines of C-12(O-16)2 at 23 locations on the Martian disk. It is deduced on the basis of these data that the temperature of the middle Martian atmosphere varies with latitude, and a meridional gradient of 0.4-0.9 K/deg latitude is indicated. The highest temperatures are noted to lie at high latitudes in the winter hemisphere; as in the terrestrial case of seasonal effects at the menopause, this winter polar warming in the Martian middle atmosphere requires departures from radiative equilibrium. Two-dimensional circulation model comparisons with these results indicate that atmospheric dust may enhance this dynamical heating at high winter latitudes.

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