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Detailed Reference Information |
Benkhoff, J. and Spohn, T. (1991). Thermal histories of the KOSI samples. Geophysical Research Letters 18: doi: 10.1029/90GL02581. issn: 0094-8276. |
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Thermal histories of (H2O, CO2, CH3OH) porous ice/dust samples during KOSI sublimation experiments are presented and interpreted. The histories show the evolution of a steep temperature rise in a top layer dust mantle, the motion of the water ice sublimation front characterized by a temperature of approximately 210 K and by a discontinuity of the temperature gradient, and the faster motion of the CO2 sublimation front with a temperature of approximately 125 K and a second temperature gradient discontinuity. The CO2 depleted middle layer between the dust mantle and the CO2 ice sublimation front developed a convex temperature profile as a consequence of heat transfer by water vapor flow. It is estimated that water vapor flow transferred heat at a rate of approximately half of the insolation while heat conduction through the matrix contributed only about 5% of the insolation to heat transfer. The matrix thermal diffusivity varied from sample to sample beween 2 and 13¿10-8 m2s-1. The bottom CO2 enriched layer showed a slow continuous warming caused by CO2 resublimation to approximately 125 K. The latter temperature is used to estimate a permeability of the sample of 10-1 m2s-1. ¿American Geophysical Union 1991 |
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Abstract |
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Keywords
Planetology, Comets and Small Bodies, Physics and chemistry of materials, Planetology, Comets and Small Bodies, Radiation and spectra |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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