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| Titel |
Photopolarimetric retrievals of snow properties |
| VerfasserIn |
M. Ottaviani, B. van Diedenhoven, B. Cairns |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 5 ; Nr. 9, no. 5 (2015-10-08), S.1933-1942 |
| Datensatznummer |
250116857
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| Publikation (Nr.) |
 copernicus.org/tc-9-1933-2015.pdf |
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| Zusammenfassung |
| Polarimetric observations of snow surfaces, obtained in the
410–2264 nm range with the Research Scanning Polarimeter
onboard the NASA ER-2 high-altitude aircraft, are analyzed and
presented. These novel measurements are of interest to the remote
sensing community because the overwhelming brightness of snow
plagues aerosol and cloud retrievals based on airborne and spaceborne
total reflection measurements. The spectral signatures of the
polarized reflectance of snow are therefore worthwhile investigating
in order to provide guidance for the adaptation of algorithms
currently employed for the retrieval of aerosol properties over soil
and vegetated surfaces. At the same time, the increased information
content of polarimetric measurements allows for a meaningful
characterization of the snow medium. In our case, the grains are
modeled as hexagonal prisms of variable aspect ratios and microscale
roughness, yielding retrievals of the grains' scattering asymmetry
parameter, shape and size. The results agree with our previous
findings based on a more limited data set, with the majority of
retrievals leading to moderately rough crystals of extreme aspect
ratios, for each scene corresponding to a single value of the
asymmetry parameter. |
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