Modeling the reflectance of CO2 frost with new optical constants: Application to Martian south polar CAP spectra

Mathematics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Absorptivity, Carbon Dioxide, Environment Models, Mars Surface, Planetary Composition, Reflectance, Solidified Gases, Albedo, Mathematical Models, Spectral Bands

Scientific paper

New measurements of the absorption coefficients of CO2 ice, in most of the spectral range 0.2 to 3.9 microns where absorption coefficients are below 1.5 per cm, have recently been made. Although these measurements are preliminary, they contain spectral detail not seen previously in the literature. Therefore, it is useful to combine these new data with older data from spectral regions of stronger absorption and reformulate models of the albedo or reflectance of CO2 frost. These models can then be adjusted in an attempt to match measurements of Martian polar deposits, such as the set of spectra returned by the IRS instrument on Mariner 7 (1969). The new absorption coefficients of CO2 ice were measured on several samples of 41-mm thickness at 150-155 K. A portion of the spectrum from 1.9 to 3.9 microns wavelength is shown in the form of imaginary coefficient of refraction ( = linear absorption x wavelength / 4 pi). The data above 3x10-5 are obtained from, except for the absorption line at 3.32 micrometers, which is extrapolated in a way that is consistent with laboratory frost measurements, but the peak level is still highly uncertain. This new imagary coefficient, combined with the real coefficient, can be immediately applied to the models for hemispherical albedo, resulting in markedly different results from those in that study. The results for an infinite optical depth layer and solar incidence of 60 degrees are plotted for a range of mean particle radii from 0.03 to 3 mm.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Modeling the reflectance of CO2 frost with new optical constants: Application to Martian south polar CAP spectra does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Modeling the reflectance of CO2 frost with new optical constants: Application to Martian south polar CAP spectra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modeling the reflectance of CO2 frost with new optical constants: Application to Martian south polar CAP spectra will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1448683

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.