Diurnal Variations in Martian Atmospheric Water Vapor

Details Diurnal Variations in Martian Atmospheric Water Vapor Diurnal Variations in Martian Atmospheric Water Vapor

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.7607s&link_type=abstract

American Astronomical Society, DPS meeting #31, #76.07

Astronomy and Astrophysics

Astronomy

Scientific paper

We have observed a distinct, repeatable, and substantial diurnal variability of water vapor abundance in Mars' atmosphere. This determination was made possible by expanding our observing program that measures water vapor in Mars' atmosphere to include the nearly simultaneous measurement of scattering opacity in the R(8,10,12) lines of CO_2. By modeling and fitting the CO_2 lines we are able to estimate the scattering opacity and correct our measured H_2O measurements accordingly. Using a ``dusty" curve-of-growth for the water abundance calculation results in abundances greater than those obtained with calculations in clear air. Effects are greatest in very dusty air, and at high airmasses where the pathlength is longest (limbs). Even after these corrections, the apparent early morning and evening lows in water abundance that have previously been observed by Barker and the Sprague et al. group, remain.

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