Martian Dust Storm: Its Depth on 25 November 1971

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Science  21 Jan 1972:
Vol. 175, Issue 4019, pp. 323
DOI: 10.1126/science.175.4019.323


Carbon dioxide absorption on Mars was observed by Earth-based spectroscopy at 10,500 angstroms. Its abundance was equivalent to a partial pressure of 2.0 millibars instead of the normal 5.5 millibars. The dust layer was therefore opaque to a height of about 11 kilometers. On 10 December, a pressure of 5.8 millibars was found.