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| Titel |
Modelling and climatic interpretation of the length fluctuations of Glaciar Frías (north Patagonian Andes, Argentina) 1639–2009 AD |
| VerfasserIn |
P. W. Leclercq, P. Pitte, R. H. Giesen, M. H. Masiokas, J. Oerlemans  |
| 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. 5 ; Nr. 8, no. 5 (2012-09-03), S.1385-1402 |
| Datensatznummer |
250005830
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| Publikation (Nr.) |
 copernicus.org/cp-8-1385-2012.pdf |
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| Zusammenfassung |
| We explore the climatic information contained in the record of length
fluctuations of Glaciar Frías, in the north Patagonian Andes of Argentina.
This record is one of the longest and most detailed glacier records in
southern South America, starting in 1639. In order to interpret the length
variations of Glaciar Frías since the maximum Little Ice Age extent, we use
a combination of a simplified surface energy-balance model to calculate the
glacier mass balance, and a flowline model to account for the dynamical
response of the glacier to changes in the climatic forcing. The overall
retreat of the glacier observed over 1639–2009 is best explained by an
annual mean temperature increase of 1.2 °C or a decrease in annual
precipitation of 34%, most of which would have occurred during the 20th
century. The glacier model is also forced with two independent tree-ring and
multi-proxy reconstructions of precipitation and temperature. The
uncertainties in these reconstructions are rather large, leading to a wide
range in the modelled glacier length that includes most of the observations.
However, in both reconstructions, the mid-17th century seems to be too cold
and the early 19th century too warm to explain the observed glacier lengths
with the glacier model forced with the reconstructions. Forcing with
reconstructed precipitation and temperature separately shows that the
influence of historical variations in precipitation on the glacier
fluctuations of Glaciar Frías is smaller than that of the temperature
fluctuations. This suggests that the observed 1639–2009 retreat could be
best explained by a warming close to 1.2 °C. |
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