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| Titel |
Monitoring spatial and temporal variations of surface albedo on Saint Sorlin Glacier (French Alps) using terrestrial photography |
| VerfasserIn |
M. Dumont, P. Sirguey, Y. Arnaud, D. Six |
| 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 ; 5, no. 3 ; Nr. 5, no. 3 (2011-09-27), S.759-771 |
| Datensatznummer |
250002603
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| Publikation (Nr.) |
 copernicus.org/tc-5-759-2011.pdf |
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| Zusammenfassung |
| Accurate knowledge of temperate glacier mass balance is essential to
understand the relationship between glacier and climate. Defined as
the reflected fraction of incident radiation over the whole solar
spectrum, the surface broadband albedo is one of the most important variable
in a glacier's mass balance. This study presents a new method to retrieve
the albedo of frozen surfaces from terrestrial photography at visible
and near infrared wavelengths. This method accounts for the
anisotropic reflectance of snow and ice surfaces and uses a radiative
transfer model for narrow-to-broadband conversion. The accuracy of the
method was assessed using concomitant measurements of albedo during
the summers 2008 and 2009 on Saint Sorlin Glacier (Grandes Rousses,
France). These albedo measurements are performed at two locations on
the glacier, one in the ablation area and the other in the
accumulation zone, with a net radiometer Kipp and Zonen CNR1. The main
sources of uncertainty are associated with the presence of high clouds
and the georeferencing of the photographs. |
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