Infrared Spectroscopy Experiment on the Mariner 9 Mission: Preliminary Results

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Science  21 Jan 1972:
Vol. 175, Issue 4019, pp. 305-308
DOI: 10.1126/science.175.4019.305


The Mariner 9 infrared spectroscopy experiment has provided goodquality spectra of many areas of Mars, predominantly in the southern hemisphere. Large portions of the thermal emission spectra are significantly affected by dust with a silicon oxide content approximately corresponding to that of an intermediate igneous rock, thus implying that Mars has undergone substantial geochemical differentiation. Derived temperature profiles indicate a warm daytime upper atmosphere with a strong warming over the south polar cap. Atmospheric water vapor is clearly observed over the south polar area and less strongly over other regions.