A first shallow firn-core record from Glaciar La Ollada, Cerro Mercedario, central Argentine Andes

Authors: Bolius, David; Schwikowski, Margit; Jenk, Theo; Gäggeler, Heinz W.; Casassa, Gino; Rivera, Andrés

Source: Annals of Glaciology, Volume 43, Number 1, September 2006 , pp. 14-22(9)

Publisher: International Glaciological Society

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Abstract:

In January 2003, shallow firn cores were recovered from Glaciar Esmeralda on Cerro del Plomo (33°14′ S, 70°13′ W; 5300 ma.s.l.), central Chile, and from Glaciar La Ollada on Cerro Mercedario (31°58′ S, 70°07′ W; 6070 ma.s.l.), Argentina, in order to find a suitable archive for paleoclimate reconstruction in a region strongly influenced by the El Niño-Southern Oscillation. In the area between 28° S and 35° S, the amount of winter precipitation is significantly correlated to the Southern Oscillation Index, with higher values during El Niño years. Glaciochemical analysis indicates that the paleo-record at Glaciar La Ollada is well preserved, whereas at Glaciar Esmeralda the record is strongly influenced by meltwater formation and percolation. A preliminary dating of the Mercedario core by annual-layer counting results in a time-span of 17 years (1986-2002), yielding an average annual net accumulation of 0.45 m w.e.

Document Type: Research article

DOI: 10.3189/172756406781812474

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