Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104.9019t&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue E4, p. 9019-9026
Physics
29
Planetology: Solar System Objects: Mars, Planetology: Solid Surface Planets: Atmospheres-Composition And Chemistry
Scientific paper
The Imager for Mars Pathfinder (IMP) was the first instrument to measure the atmospheric water on Mars from its surface. It took the images of the Sun through the Martian atmosphere in five narrowband filters, two in the 0.94 μm H2O band and three in the continuum around it. The observations were carried out in the mornings and in the evenings when the Sun was between 3° and 8° above the horizon. The absorption due to the atmospheric water vapor did not exceed 2%. An average column density of 6+/-4 precipitated microns (pr μm) was derived from the IMP data. The dependence of the observed H2O transmittance on Sun elevation tentatively implies that the water vapor is not uniformly mixed in the atmosphere but is rather confined to a layer 1-3 km thick near the surface. IMP observations also indicate a horizontal inhomogeneity of the layer but show no significant morning-to-evening variations of the water vapor amount.
Lemmon Mark Thomas
Markiewicz Wojciech J.
Sablotny R. M.
Smith Paul H.
Thomas Nicholas
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