Northern Hemisphere forcing of the last deglaciation in southern Patagonia

Research Article| July 01, 2012 Northern Hemisphere forcing of the last deglaciation in southern Patagonia Daniel S. Murray; Daniel S. Murray 1Department of Geoscience, University of Wisconsin, Madison, Wisconsin 53706, USA Search for other works by this author on: GSW Google Scholar Anders E. Carlson; Anders E. Carlson * 1Department of Geoscience, University of Wisconsin, Madison, Wisconsin 53706, USA2Center for Climatic Research, University of Wisconsin, Madison, Wisconsin 53706, USA *E-mail: acarlson@geology.wisc.edu. Search for other works by this author on: GSW Google Scholar Brad S. Singer; Brad S. Singer 1Department of Geoscience, University of Wisconsin, Madison, Wisconsin 53706, USA Search for other works by this author on: GSW Google Scholar Faron S. Anslow; Faron S. Anslow 3Pacific Climate Impacts Consortium, University of Victoria, Victoria, British Columbia V8P 1A1, Canada Search for other works by this author on: GSW Google Scholar Feng He; Feng He 2Center for Climatic Research, University of Wisconsin, Madison, Wisconsin 53706, USA4Department of Atmospheric and Oceanic Sciences, University of Wisconsin, Madison, Wisconsin 53706, USA Search for other works by this author on: GSW Google Scholar Marc Caffee; Marc Caffee 5Departments of Earth and Atmospheric Sciences & Physics, Purdue University, West Lafayette, Indiana 47907, USA Search for other works by this author on: GSW Google Scholar Shaun A. Marcott; Shaun A. Marcott 6College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Zhengyu Liu; Zhengyu Liu 2Center for Climatic Research, University of Wisconsin, Madison, Wisconsin 53706, USA4Department of Atmospheric and Oceanic Sciences, University of Wisconsin, Madison, Wisconsin 53706, USA Search for other works by this author on: GSW Google Scholar Bette L. Otto-Bliesner Bette L. Otto-Bliesner 7Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, Colorado 80307, USA Search for other works by this author on: GSW Google Scholar Geology (2012) 40 (7): 631–634. https://doi.org/10.1130/G32836.1 Article history received: 19 Sep 2011 rev-recd: 08 Feb 2012 accepted: 08 Feb 2012 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Daniel S. Murray, Anders E. Carlson, Brad S. Singer, Faron S. Anslow, Feng He, Marc Caffee, Shaun A. Marcott, Zhengyu Liu, Bette L. Otto-Bliesner; Northern Hemisphere forcing of the last deglaciation in southern Patagonia. Geology 2012;; 40 (7): 631–634. doi: https://doi.org/10.1130/G32836.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Although the general patterns of deglacial climate change are relatively well constrained, how, and to what magnitude, large parts of the Southern Hemisphere responded to deglacial forcings remains unknown, particularly for the early part of the last deglaciation. We investigate the timing and magnitude of early deglacial climate change using cosmogenic 10Be surface exposure ages of moraines deposited by glaciers in the Rio Guanaco Valley, adjacent to the Southern Patagonian Ice Field at 50°S. We demonstrate that the beginning of ice retreat from the local last glacial maximum occurred at 19.7 ± 1.1 ka, with significant retreat commencing at 18.9 ± 0.4 ka, concurrent with glacier retreat elsewhere in southern Patagonia and New Zealand and with warming of Southern Hemisphere middle to high latitudes. A third moraine shows that half of the deglacial retreat upvalley had occurred by 17.0 ± 0.3 ka. Equilibrium line altitudes and climate simulations show ∼1.5 °C of warming in southern Patagonia between 18.9 ± 0.4 ka and 17.0 ± 0.3 ka, one-third of the total estimated deglacial warming relative to present. The climate model links this warming to retreat of Northern Hemisphere ice sheets ca. 19 ka through changes in ocean circulation that caused a bipolar seesaw response resulting in Southern Hemisphere warming and driving initial deglaciation across southern Patagonia. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.