Laboratory Study of Water Ice Growth Rates at Martian Atmosphere Conditions

Details Laboratory Study of Water Ice Growth Rates at Martian Atmosphere Conditions Laboratory Study of Water Ice Growth Rates at Martian Atmosphere Conditions

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p21b1220m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P21B-1220

Physics

[0320] Atmospheric Composition And Structure / Cloud Physics And Chemistry, [5405] Planetary Sciences: Solid Surface Planets / Atmospheres, [5422] Planetary Sciences: Solid Surface Planets / Ices, [6225] Planetary Sciences: Solar System Objects / Mars

Scientific paper

The formation and growth of water ice clouds play a pivotal role in the martian hydrological cycle, and any robust model of the climate of Mars must account for the effects of these processes. Unfortunately, the growth behavior of water ice at temperatures and pressures relevant to martian studies is not well characterized, requiring modelers to rely on extrapolations from data sets typically taken from terrestrial literature. The present laboratory study charts the growth rate of water ice as a function of temperature (approximately -120 to -80°C) and pressure (approximately 1E-7 to 1E-4 Torr), principally in the phase space between nucleation and the vapor/solid equilibrium line. The appearance and subsequent growth of ice on a silicon wafer were monitored via infrared spectroscopy, and the time derivative of the characteristic water ice absorbance band was used to calculate net rates of deposition and sublimation as pressure and temperature were varied around equilibrium. These data were further interpreted to yield values for the net sticking coefficient of vapor phase molecules to the ice surface. These results will be beneficial to modelers of the martian climate, as they provide further insight into how quickly martian water ice clouds should be expected to form and dissipate under a given set of conditions.

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