The Martian atmosphere during the Viking mission. I. Infrared measurements of atmospheric temperatures revisited.

Details The Martian atmosphere during the Viking mission. I. Infrared measurements of atmospheric temperatures revisited. The Martian atmosphere during the Viking mission. I. Infrared measurements of atmospheric temperatures revisited.

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000icar..145..555w&link_type=abstract

Icarus, Vol. 145, No. 2, p. 555 - 579

Computer Science

47

Mars Atmosphere: Temperatures

Scientific paper

The Viking Infrared Thermal Mapper 15-μm channel brightness temperature observations (IRTM T15) provide extensive spatial and temporal coverage of Martian atmospheric temperatures on diurnal to seasonal time scales. The 15-μm channel was designed so that these temperatures would be representative of a deep layer of atmosphere centered at 0.5 mb (≡25 km). A re-examination of the IRTM data indicates that the 15-μm channel was additionally sensitive to surface radiance so that air temperature determinations (nominal T15) are significantly biased when the thermal contrast between the surface and atmosphere is large. This bias is suggested by the strong correlation between the diurnal variation of tropical T15 and surface temperatures for non-dust-storm conditions. The authors show that numerical modeling of the thermal tides provides a basis for distinguishing between the surface and atmospheric contributions to IRTM T15 and thus allows the atmospheric component to be estimated. The resulting bias amounts to a ≡15-K offset for midday atmospheric temperatures at subsolar latitudes during relatively clear periods and is negligible at night.

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