Physics – Optics
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0214h&link_type=abstract
American Astronomical Society, DPS meeting #28, #02.14; Bulletin of the American Astronomical Society, Vol. 28, p.1060
Physics
Optics
Scientific paper
New measurements of the absorption coefficient of pure CO2 ice [1] can be used in simple radiative transfer models to predict the shortwave albedo and thermal emissivity as a function of wavelength for particulate frosts which could occur in the winter hemispheres of Mars. A large portion of the CO2 atmosphere of Mars is known to condense seasonally onto the winter polar caps, although the microphysical state of these deposits is not well understood. Two-stream models of albedo and emissivity of CO2 frosts were previously presented by Warren, et. al [2], but they used bulk optical constants for CO2 ice [3] which are an order of magnitude or more different from the new measurements in the radiatively important wavelength regions where absorption is weakest. As in the earlier study, models of pure snow with different mean particle radii, different solar incidence or infrared emission angle, finite snow depth, intimate mixtures with water ice and dust, and layering with water ice and dust will be investigated. In addition, a thermophysical model of a clear, solid CO2 ice layer, which has been suggested as the form of the seasonal polar cap in the fall and winter seasons [4], will be presented. These results will be useful in studies of the polar heat balance of Mars, and will aid the interpretation of new spectral measurements of the Martian polar regions in both solar and thermal wavelengths by the Thermal Emission Spectrometer on Mars Global Observer and the Planetary Fourier Spectrometer and OMEGA imaging spectrometer on Mars 96, which arrive in late 1997. [1] Hansen, G. B., PhD Thesis, University of Washington, Seattle, 1996. [2] Warren, S. G., et al., J.G.R., 95, 14717, 1990. [3] Warren, S. G., Appl. Optics, 25, 2650, 1986. [4] Paige, D. A., et al., B.A.A.S., 27, 1098, 1995 (abstract); Forget, F., et al., J.G.R., 100, 21219, 1995.
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