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| Titel |
Mass balance evolution of Martial Este Glacier, Tierra del Fuego (Argentina) for the period 1960–2099 |
| VerfasserIn |
M. Buttstädt, M. Möller, R. Iturraspe, C. Schneider |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 4th EGU Alexander von Humboldt Conference "The Andes: Challenge for Geosciences" ; Nr. 22 (2009-12-14), S.117-124 |
| Datensatznummer |
250014736
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| Publikation (Nr.) |
 copernicus.org/adgeo-22-117-2009.pdf |
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| Zusammenfassung |
| The Martial Este Glacier in southern Tierra del Fuego was studied in order
to estimate the surface mass balance from 1960 until 2099. For this reason a
degree-day model was calibrated. Air temperature and precipitation data
obtained from 3 weather stations as well as glaciological measurements were
applied. The model was driven using a vertical air temperature gradient of
0.69 K/100 m, a degree-day factor for snow of 4.7 mm w.e. K−1 day−1, a degree-day factor for ice of
9.4 mm w.e. K−1 day−1 and a precipitation gradient of
22%/100 m. For the purpose of surface mass balance reconstruction for the time
period 1960 until 2006 a winter vertical air temperature gradient of 0.57 K/100 m
and a summer vertical air temperature gradient of 0.71 K/100 m were
added as well as a digital terrain model. The key finding is an almost
continuous negative mass balance of −772 mm w.e. a−1 throughout
this period. While the calculation of the mass balance for the period
1960–2006 is based on instrumental records, the mass balance for the years
2007 until 2099 was estimated based on the IPCC SRES A2-scenario. To
accomplish this estimation, the dataset of the global climate model HadCM3
was statistically downscaled to fit local conditions at Martial Este
Glacier. Subsequently, the downscaled air temperature and precipitation were
applied to a volume-area scaling glacier change model. Findings reveal an
enduring deglaciation resulting in a surface area reduction of nearly 93%
until 2099. This implicates that the Martial Este Glacier might be melted
off at the beginning of the 22nd century. |
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