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| Titel |
Retrieval of snow parameters using simultaneous light reflection and transmission measurements |
| VerfasserIn |
A. Kokhanovsky, H. Negi |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250059513
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| Zusammenfassung |
| Usually the snow optical characteristics are retrieved from the spectral reflectance
measurements applied either horizontally or vertically in a snow pack. In this work we show
that the simultaneous light transmission and reflectance measurements for the same
snow layer improves the solution of inverse problem and allow for the derivation of
important snow characteristics such as the snow extinction coefficient not accessible for
just reflectance alone measurements. In particular, the applications of asymptotic
analytical radiative transfer (AART) theory are discussed for the retrieval of snow
parameters from reflectance and transmittance observations as well as from spherical
albedo and global transmittance data. Snow optical parameters such as extinction
efficient, diffuse exponent, asymptotic flux extinction coefficient (AFEC), snow
optical thickness and probability of photon absorption were retrieved for a temperate
snow cover from spherical albedo and global transmittance data. The AFEC values
were retrieved for different types of snow cover (thick, thin, dry, wet, new and old
snow). A good agreement between AART and an independent radiative transfer
model retrievals shows that AART theory can be applied for different types of snow.
The values of e-folding depths were in the range from 4.5 to 17 cm, where the
minimum value was for wet snow and the maximum was for old dry snow. The
snow physical characteristics such as grain size and density were also retrieved
using derived optical parameters and found in agreement with in situ measurements. |
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