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| Titel |
Deglaciation of the Caucasus Mountains, Russia/Georgia, in the 21st century observed with ASTER satellite imagery and aerial photography |
| VerfasserIn |
M. Shahgedanova, G. Nosenko, S. Kutuzov, O. Rototaeva, T. Khromova |
| 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 ; 8, no. 6 ; Nr. 8, no. 6 (2014-12-16), S.2367-2379 |
| Datensatznummer |
250116394
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| Publikation (Nr.) |
 copernicus.org/tc-8-2367-2014.pdf |
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| Zusammenfassung |
| Changes in the map area of 498 glaciers located on the Main Caucasus ridge (MCR)
and on Mt. Elbrus in the Greater Caucasus Mountains (Russia and Georgia)
were assessed using multispectral ASTER and panchromatic Landsat imagery
with 15 m spatial resolution in 1999/2001 and 2010/2012. Changes in
recession rates of glacier snouts between 1987–2001 and 2001–2010 were
investigated using aerial photography and ASTER imagery for a sub-sample of
44 glaciers. In total, glacier area decreased by 4.7 ± 2.1% or
19.2 ± 8.7 km2 from 407.3 ± 5.4 km2 to 388.1 ± 5.2 km2.
Glaciers located in the central and western MCR lost 13.4 ± 7.3 km2
(4.7 ± 2.5%) in total or 8.5 km2 (5.0 ± 2.4%) and
4.9 km2 (4.1 ± 2.7%) respectively. Glaciers on Mt.
Elbrus, although located at higher elevations, lost 5.8 ± 1.4 km2
(4.9 ± 1.2%) of their total area. The recession rates of valley
glacier termini increased between 1987–2000/01 and 2000/01–2010 (2000 for the western
MCR and 2001 for the central MCR and Mt.~Elbrus) from
3.8 ± 0.8, 3.2 ± 0.9 and 8.3 ± 0.8 m yr−1
to 11.9 ± 1.1, 8.7 ± 1.1 and
14.1 ± 1.1 m yr−1 in the central and western MCR and on Mt. Elbrus
respectively. The highest rate of increase in glacier termini retreat was
registered on the southern slope of the central MCR where it has tripled. A
positive trend in summer temperatures forced glacier recession, and strong
positive temperature anomalies in 1998, 2006, and 2010 contributed to the
enhanced loss of ice. An increase in accumulation season precipitation
observed in the northern MCR since the mid-1980s has not compensated for the
effects of summer warming while the negative precipitation anomalies,
observed on the southern slope of the central MCR in the 1990s, resulted in
stronger glacier wastage. |
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