Mars south polar spring and summer temperatures - A residual CO2 frost

Details Mars south polar spring and summer temperatures - A residual CO2 frost Mars south polar spring and summer temperatures - A residual CO2 frost

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.8263k&link_type=abstract

Journal of Geophysical Research, vol. 84, Dec. 30, 1979, p. 8263-8288. NASA-supported research

Physics

57

Carbon Dioxide, Frost, Mars Surface, Polar Caps, Summer, Surface Temperature, Albedo, Annual Variations, Energy Budgets, Mars Atmosphere, Photomapping, Planetary Mapping, Remote Sensors, Residual Gas, Surface Properties, Thermal Mapping, Viking Orbiter 2

Scientific paper

Viking infrared thermal mapper (IRTM) energy measurements over the Mars south polar cap throughout the Martian spring and summer revealed complex spatial, spectral, and temporal variations. High albedos did not directly correspond with low temperatures, and as the cap shrank to its residual position, it maintained large differences in brightness temperature between the four IRTM surface-sensing bands at 7, 9, 11, and 20 microns. The late summer infrared spectral pattern can be matched by a surface consisting of CO2 frost with 20 micron emissivity of 0.8 and about 6% dark, warm soil under a dusty atmosphere of moderate infrared opacity and spectral properties similar to those measured for the Martian global dust storms. Low temperature, the absence of appreciable water vapor in the south polar atmosphere, and the absence of surface warming expected if H2O were to become exposed, all imply that the residual south polar cap was covered by solid CO2.

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