Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sdum.nasa...16c&link_type=abstract
In NASA. Ames Research Center, Sand and Dust on Mars p 16-17 (SEE N91-27057 18-91)
Physics
Albedo, Atmospheric Temperature, Dust, Dust Storms, Mars Atmosphere, Mars Environment, Mars Surface, Optical Properties, Particulates, Radiative Transfer, Scattering, Temperature Profiles, Brightness, Calibrating, Latitude, Longitude, Optical Thickness, Phase Shift, Thermal Mapping, Viking Lander Spacecraft, Viking Mars Program
Scientific paper
The results of research with two distinctly separate sets of observations yield new information on the optical properties of particulate scatterers in the Mars atmosphere, and on the interannual variability of the abundance of such scatterers in the Mars atmosphere. The first set of observations were taken by the IRTM (Infrared Thermal Mapper) instrument onboard the Viking Orbiters, during the period 1976 to 1980. Several hundred emission phase function (EPF) sequences were obtained over the Viking mission, in which the IRTM visual brightness channel observed the same area of surface/atmosphere as the spacecraft passed overhead. The 1 to 2 percent accuracy of calibration and the phase-angle coverage that characterizes these data make them ideally suited to determining both the optical depths and optical properties of dust and cloud scatterers in the Mars atmosphere versus latitude, longitude, seasons (Ls), and surface elevation over the extended period of Viking observations. The EPF data were analyzed with a multiple scattering radiative transfer code to determine dust single scattering albedos which are distinctly higher than indicated by the Viking Lander observations. The second set of observations regard ground-based observations of the 1.3 to 2.6 mm rotational transitions of CO in the Martian atmosphere. The low-to-mid latitude average of the atmospheric temperature profile (0 to 70 km altitude) were derived from a number of such observations over the 1980 to 1990 period.
Clancy Todd R.
Lee Wai Shing
Muhleman Duane O.
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