The impact of dynamic topography change on Antarctic ice sheet stability during the mid-Pliocene warm period

Research Article| October 01, 2015 The impact of dynamic topography change on Antarctic ice sheet stability during the mid-Pliocene warm period Jacqueline Austermann; Jacqueline Austermann * 1Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, USA *E-mail: jaustermann@fas.harvard.edu Search for other works by this author on: GSW Google Scholar David Pollard; David Pollard 2Earth and Environmental Systems Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA Search for other works by this author on: GSW Google Scholar Jerry X. Mitrovica; Jerry X. Mitrovica 1Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, USA Search for other works by this author on: GSW Google Scholar Robert Moucha; Robert Moucha 3Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA Search for other works by this author on: GSW Google Scholar Alessandro M. Forte; Alessandro M. Forte 4Centre GEOTOP, Université du Québec à Montréal, Montréal, H3C 3P8 Québec, Canada Search for other works by this author on: GSW Google Scholar Robert M. DeConto; Robert M. DeConto 5Department of Geosciences, University of Massachusetts, Amherst, Massachusetts 01003, USA Search for other works by this author on: GSW Google Scholar David B. Rowley; David B. Rowley 6Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, USA Search for other works by this author on: GSW Google Scholar Maureen E. Raymo Maureen E. Raymo 7Lamont Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Jacqueline Austermann * 1Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, USA David Pollard 2Earth and Environmental Systems Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA Jerry X. Mitrovica 1Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, USA Robert Moucha 3Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA Alessandro M. Forte 4Centre GEOTOP, Université du Québec à Montréal, Montréal, H3C 3P8 Québec, Canada Robert M. DeConto 5Department of Geosciences, University of Massachusetts, Amherst, Massachusetts 01003, USA David B. Rowley 6Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, USA Maureen E. Raymo 7Lamont Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA *E-mail: jaustermann@fas.harvard.edu Publisher: Geological Society of America Received: 18 May 2015 Revision Received: 12 Aug 2015 Accepted: 13 Aug 2015 First Online: 09 Mar 2017 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2015 Geological Society of America Geology (2015) 43 (10): 927–930. https://doi.org/10.1130/G36988.1 Article history Received: 18 May 2015 Revision Received: 12 Aug 2015 Accepted: 13 Aug 2015 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 Jacqueline Austermann, David Pollard, Jerry X. Mitrovica, Robert Moucha, Alessandro M. Forte, Robert M. DeConto, David B. Rowley, Maureen E. Raymo; The impact of dynamic topography change on Antarctic ice sheet stability during the mid-Pliocene warm period. Geology 2015;; 43 (10): 927–930. doi: https://doi.org/10.1130/G36988.1 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 The evolution of the Antarctic ice sheet during the mid-Pliocene warm period (MPWP) remains uncertain and has important implications for our understanding of ice sheet response to modern global warming. The extent to which marine-based sectors of the East Antarctic Ice Sheet (EAIS) retreated during the MPWP is particularly contentious, with geological observations and geochemical analyses being cited to argue for either a relatively minor or a significant ice sheet retreat in response to mid-Pliocene warming. The stability of marine-based ice sheets is intimately linked to bedrock elevation at their grounding lines, and previous ice sheet modeling assumed that Antarctic bedrock elevation during the MPWP was the same as today with the exception of a correction for the crustal response to ice loading. However, various processes may have perturbed bedrock elevation over the past 3 m.y., most notably vertical deflections of the crust driven by mantle convective flow, or dynamic topography. Here we present simulations of mantle convective flow that are consistent with a wide range of present-day observables and use them to predict changes in dynamic topography and reconstruct bedrock elevations during the MPWP. We incorporate these elevations into a simulation of the Antarctic ice sheet during the MPWP and find that the correction for dynamic topography change has a significant effect on the stability of the EAIS within the marine-based Wilkes Basin, with the ice margin in that sector retreating considerably further inland (200–560 km) relative to simulations that do not include this correction for bedrock elevation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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