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Relative influence upon microwave emissivity of fine-scale stratigraphy, internal scattering, and dielectric properties

Pure and Applied Geophysics PAGEOPH

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DOI: 10.1007/BF00878953

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Abstract

The microwave emissivity of relatively low-loss media such as snow, ice, frozen ground, and lunar soil is strongly influenced by fine-scale layering and by internal scattering. Radiometric data, however, are commonly interpreted using a model of emission from a homogeneous, dielectric halfspace whose emissivity derives exclusively from dielectric properties. Conclusions based upon these simple interpretations can be erroneous. Examples are presented showing that the emission from fresh or hardpacked snow over either frozen or moist soil is governed dominantly by the size distribution of ice grains in the snowpack. Similarly, the thickness of seasonally frozen soil and the concentration of rock clasts in lunar soil noticeably affect, respectively, the emissivities of northern latitude soils in winter and of the lunar regolith. Petrophysical data accumulated in support of the geophysical interpretation of microwave data must include measurements of not only dielectric properties, but also of geometric factors such as finescale layering and size distributions of grains, inclusions, and voids. ?? 1976 Birkha??user Verlag.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Relative influence upon microwave emissivity of fine-scale stratigraphy, internal scattering, and dielectric properties
Series title:
Pure and Applied Geophysics PAGEOPH
DOI:
10.1007/BF00878953
Volume
114
Issue:
2
Year Published:
1976
Language:
English
Publisher:
Birkha??user-Verlag
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
287
Last page:
299