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| Titel |
Little Ice Age advance and retreat of Glaciar Jorge Montt, Chilean Patagonia |
| VerfasserIn |
A. Rivera, M. Koppes, C. Bravo, J. C. Aravena |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 8, no. 2 ; Nr. 8, no. 2 (2012-03-05), S.403-414 |
| Datensatznummer |
250005459
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| Publikation (Nr.) |
 copernicus.org/cp-8-403-2012.pdf |
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| Zusammenfassung |
| Glaciar Jorge Montt (48°20' S/73°30' W), one of
the main tidewater glaciers of the Southern Patagonian Icefield (SPI), has
experienced the greatest terminal retreat observed in Patagonia during the
past century, with a recession of 19.5 km between 1898 and 2011. This
retreat has revealed trees laying subglacially until 2003. These trees were
dated using radiocarbon, yielding burial ages between 460 and 250 cal yrs BP. The presence of old growth forest during those dates indicates that
Glaciar Jorge Montt was upvalley of its present position before the commonly
recognized Little Ice Age (LIA) period in Patagonia. The post-LIA retreat was
most likely triggered by climatically induced changes during the 20th
century; however, Glaciar Jorge Montt has responded more dramatically than
its neighbours. The retreat of Jorge Montt opened a 19.5 km long fjord since
1898, which reaches depths in excess of 390 m. The bathymetry is well
correlated with glacier retreat rates, suggesting that dynamic responses of
the glacier are at least partially connected to near buoyancy conditions at
the ice front, resulting in high calving fluxes, accelerating thinning rates
and rapid ice velocities. |
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