Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p23a1086p&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P23A-1086
Other
3311 Clouds And Aerosols, 3337 Global Climate Models (1626, 4928), 5405 Atmospheres (0343, 1060), 5422 Ices, 6225 Mars
Scientific paper
Understanding the role of water ice clouds in the Martian water cycle and climate as observed by Mars Global Surveyor, Mars Reconnaissance Orbiter, and Mars Odyssey depends on cloud properties such as particle size and number distributions. These, in turn, depend on poorly understood heterogeneous nucleation properties. Using classical nucleation theory, we have investigated the effect of substrate mineralogy and other parameters on model variables such as the contact parameter, m, and critical saturation ratio, S, defined as the partial pressure at nucleation divided by the equilibrium vapor pressure at the same temperature. Laboratory experiments have been performed under Martian temperature and water partial pressure conditions to determine S as a function of temperature and dust composition. Using infrared spectroscopy to monitor ice nucleation and growth, we find values of S ranging from 1 to 7 for water pressures between 5x10-7 and 1x10-4 torr and temperatures between 155 and 185 K. Below 175 K, significant supersaturation conditions may be required to nucleate water ice clouds on dust particles. The physical basis for this temperature dependence will be discussed, and simulations using the NASA Ames Mars General Circulation Model will examine the implications of these findings for the cycling of water between the surface and atmosphere.
Colaprete Anthony
Iraci Laura T.
Phebus Bruce D.
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