Glaciología

Glaciares de Chile

Antártica

"A first shallow firn core record from La Ollada Glacier on Cerro Mercedario in the Central Argentinean Andes"

Bolius, D., M. Schwikowski, B. Rufibach, T. Jenk, G. Casassa and A.Rivera (2006) : “A first shallow firn core record from La Ollada Glacier on Cerro Mercedario in the Central Argentinean Andes” Annals of Glaciology, 43, 14 – 22.

Resumen / Abstract.

In January 2003, shallow firn cores were recovered from Glaciar Esmeralda on Cerro del Plomo (33°14′ S, 70°13′ W; 5300ma.s.l.), central Chile, and from Glaciar La Ollada on Cerro Mercedario (31°58′ S, 70°07’W; 6070ma.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 0.45mw.e.

 

 

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