Patagonian glacier response during the late glacial-holocene transition
Abstract
Whether cooling occurred in the Southern Hemisphere during the Younger Dryas (YD) is key to understanding mechanisms of millennial climate change. Although Southern Hemisphere records do not reveal a distinct climate reversal during the late glacial period, many mountain glaciers readvanced. We show that the Puerto Bandera moraine (50 degrees S), which records a readvance of the Southern Patagonian Icefield (SPI), formed at, or shortly after, the end of the YD. The exposure age (10.8 +/- 0.5 thousand years ago) is contemporaneous with the highest shoreline of Lago Cardiel (49 degrees S), which records peak precipitation east of the Andes since 13 thousand years ago. Absent similar moraines west of the Andes, these data indicate an SPI response to increased amounts of easterly-sourced precipitation-reflecting changes in the Southern Westerly circulation-rather than regional cooling.
Published in:
Science 321,5887 (2008) 392-395;
Link to original published article:
http://dx.doi.org/10.1126/science.1157215
Keywords
Multidisciplinary Sciences
Date of Version
1-1-2008
Recommended Citation
Ackert, R. P.; Becker, R. A.; Singer, B. S.; Kurz, M. D.; Caffee, M. W.; and Mickelson, D. M., "Patagonian glacier response during the late glacial-holocene transition" (2008). Department of Physics and Astronomy Faculty Publications. Paper 884.
https://docs.lib.purdue.edu/physics_articles/884