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| Titel |
Fluctuations of Glaciar Esperanza Norte in the north Patagonian Andes of Argentina during the past 400 yr |
| VerfasserIn |
L. Ruiz, M. H. Masiokas, R. Villalba |
| 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. 3 ; Nr. 8, no. 3 (2012-06-27), S.1079-1090 |
| Datensatznummer |
250005597
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| Publikation (Nr.) |
 copernicus.org/cp-8-1079-2012.pdf |
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| Zusammenfassung |
| The number of studies of Little Ice Age (LIA) glacier fluctuations in
southern South America has increased in recent years but is largely biased
towards sites in the south Patagonian Andes. In this paper we present a
detailed record of length and areal fluctuations of Glaciar Esperanza Norte
(GEN) in the north Patagonian Andes of Argentina during the past four
centuries. The GEN record was reconstructed through the
dendro-geomorphological dating of moraines and the analysis of satellite
imagery, aerial photographs and documentary material complemented with
extensive field surveys. The maximum LIA extent at GEN was associated with
an outer moraine dated to the mid 17th century. At least 19 subsequent
readvances or standstills evidenced by morainic ridges were identified
inside the most extensive LIA moraine. The dating and spacing of these
moraines and the additional information available indicate that the ice
front retreated much more rapidly during the 20th century than during
earlier centuries. Comparison with the record of LIA fluctuations of Glaciar
Frías, an ice mass of similar characteristics located 110 km to the
north of GEN, shows a similar pattern of recession over the past 400 yr.
Both glacier records have the peak LIA event occurring roughly during the
same interval (early-mid 17th century) and show a minor readvance
during the 1970s, but there are still a few discrepancies in the dating of
some inner moraines. These differences may be due to local, specific factors
or associated with the inherent uncertainties in the dating of the moraines.
The chronologies of GEN and Frías are among the most detailed currently
available in Patagonia, but a larger number of study sites is needed to
develop robust, regionally representative glacier chronologies. Detailed
glaciological, geomorphological and meteorological data are also needed to
understand the glacier-climate relationships in this region and develop
reliable paleoclimatic reconstructions. |
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