Abstract
During the last glaciation, the Cordillera Darwin icefield expanded northward toward the Straits of Magellan, eastward across Isla Grande de Tierra del Fuego and through Canal Beagle, and south and west across the numerous islands of southernmost Chile. Deglaciation commenced at ~18 ka during Termination I. Alpine glaciers in the Fuegian Andes also likely retreated at that time. Radiocarbon ages from the interior regions of Cordillera Darwin suggest ice in at least some locations had retreated close to its present-day limit as early as ~16.5 ka. The most likely cause for such rapid ice retreat was rising atmospheric temperatures at the start of Termination I.
Highlights
Cordillera Darwin (~54oS; Fig. 1A) is the southernmost temperate icefield on earth, with glaciers that respond sensitively to changes in temperature (Sagredo et al, 2014).a history of its fluctuations affords important clues for reconstructing temperature history, as well as the behavior of and mechanisms within the Southern Hemisphere climate system
We focus here on the behavior of glaciers in Tierra del Fuego, southernmost South
Ages for the Bahía Inútil region were recalculated from the original papers by Kaplan et al (2011)
Summary
Cordillera Darwin (~54oS; Fig. 1A) is the southernmost temperate icefield on earth, with glaciers that respond sensitively to changes in temperature (Sagredo et al, 2014). In turn, of the southern westerly wind belts and oceanic fronts in the vicinity of Tierra del Fuego. This movement of both atmospheric and oceanic boundaries has been documented in southern South America during both glacial and interglacial times (e.g., Lamy et al, 2004, Kaiser et al, 2005; Björck et al, 2012; Moreno et al, 2012; Kohfeld et al, 2013; Vanneste et al, 2015). Darwin ice field at the last glacial maximum (LGM: 19-23 ka, Mix et al, 2001) and present the current understanding of the timing and causes of deglaciation of this region during Termination I. Superscripts after the calibrated ages are keyed to Figure 3
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