Strength of the H2O near-infrared absorption bands in hydrated minerals: Effects of particle size and correlation with albedo

Details Strength of the H2O near-infrared absorption bands in hydrated minerals: Effects of particle size and correlation with albedo Strength of the H2O near-infrared absorption bands in hydrated minerals: Effects of particle size and correlation with albedo

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgre..11310009p&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue E10, CiteID E10009

Physics

4

Mineralogy And Petrology: Planetary Mineralogy And Petrology (5410), Planetary Sciences: Solid Surface Planets: Surface Materials And Properties, Planetary Sciences: Solid Surface Planets: Physical Properties Of Materials, Planetary Sciences: Solid Surface Planets: Remote Sensing

Scientific paper

We use laboratory experiments and radiative transfer modeling to study how the 1.9- and 3-μm H2O absorption bands are affected by variations of mineral particle size and albedo. A consistency between results of physical experiments and numerical simulations demonstrates that the studied effects are well described by the theory of radiative transfer in particulate media. Band strengths show different relationships with particle size, depending on the absolute intensity of the absorption and the criterion used to calculate band strength (band depth, area, ESPAT function, etc.). Various mixing processes used to vary sample albedo reveal a strong dependence of band strengths with albedo. For the 1.9-μm band, those effects result in variations of the hydrated minerals detection limit by more than 1 order of magnitude. However, the shape of the relationship between the 1.9-μm band strength and albedo could be used to get information on the mixing mode (intimate, granular, or geographic) between hydrated and nonhydrated minerals. For the 3-μm band, we found a strong linear correlation between the integrated band area and the continuum reflectance that opens a promising way to isolate the effect of albedo on planetary surfaces and retrieve spatial variations of material hydration state. When this spectral criterion is used for the 3-μm band, the effects of particle size are very limited for particles larger than 150 μm but remain important below this value. Therefore, an independent way to derive particle size from remote sensing appears necessary to address the effects of particle size variations where small particles are present.

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