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| Titel |
Net accumulation rates derived from ice core stable isotope records of Pío XI glacier, Southern Patagonia Icefield |
| VerfasserIn |
M. Schwikowski, M. Schläppi, P. Santibañez, A. Rivera, G. Casassa |
| 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 ; 7, no. 5 ; Nr. 7, no. 5 (2013-10-25), S.1635-1644 |
| Datensatznummer |
250085173
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| Publikation (Nr.) |
 copernicus.org/tc-7-1635-2013.pdf |
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| Zusammenfassung |
| Pío XI, the largest glacier of the Southern Patagonia Icefield, reached
its neoglacial maximum extent in 1994 and is one of the few glaciers in that
area which is not retreating. In view of the recent warming it is important
to understand glacier responses to climate changes. Due to its remoteness and
the harsh conditions in Patagonia, no systematic mass balance studies have
been performed. In this study we derived net accumulation rates for the
period 2000–2006 from a 50 m (33.2 4 m weq) ice core collected in the
accumulation area of Pío XI (2600 m a.s.l., 49°16'40"S,
73°21'14"W). Borehole temperatures indicate near temperate ice,
but the average melt percent is only 16 ± 14%. Records of stable
isotopes are well preserved and were used for identification of annual
layers. Net accumulation rates range from 3.4–7.1 water equivalent (m weq)
with an average of 5.8 m weq, comparable to precipitation amounts at the
Chilean coast, but not as high as expected for the Icefield. Ice core stable
isotope data correlate well with upper air temperatures and may be used as
temperature proxy. |
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