Offshore-onshore record of Last Glacial Maximum–to–present grounding line retreat at Pine Island Glacier, Antarctica

Author:

Nichols Keir A.1ORCID,Rood Dylan H.1,Venturelli Ryan A.2,Balco Greg3,Adams Jonathan R.14,Guillaume Louise1,Campbell Seth5,Goehring Brent M.6,Hall Brenda L.5,Wilcken Klaus7,Woodward John8,Johnson Joanne S.4

Affiliation:

1. 1Department of Earth Science and Engineering, Imperial College London, London, SW7 2BX, UK

2. 2Department of Geology and Geological Engineering, Colorado School of Mines, Golden, Colorado 80401, USA

3. 3Berkeley Geochronology Center, Berkeley, California 94709, USA

4. 4British Antarctic Survey, Cambridge, CB3 0ET, UK

5. 5School of Earth and Climate Sciences and the Climate Change Institute, University of Maine, Orono, Maine 04469, USA

6. 6Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA

7. 7Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, New South Wales 2234, Australia

8. 8Geography and Environmental Sciences, Northumbria University, Newcastle, NE1 8ST, UK

Abstract

Abstract Pine Island Glacier, West Antarctica, is the largest Antarctic contributor to global sea-level rise and is vulnerable to rapid retreat, yet our knowledge of its deglacial history since the Last Glacial Maximum is based largely on marine sediments that record a retreat history ending in the early Holocene. Using a suite of 10Be exposure ages from onshore glacial deposits directly adjacent to Pine Island Glacier, we show that this major glacier thinned rapidly in the early to mid-Holocene. Our results indicate that Pine Island Glacier was at least 690 m thicker than present prior to ca. 8 ka. We infer that the rapid thinning detected at the site farthest downstream records the arrival and stabilization of the retreating grounding line at that site by 8–6 ka. By combining our exposure ages and the marine record, we extend knowledge of Pine Island Glacier retreat both spatially and temporally: to 50 km from the modern grounding line and to the mid-Holocene, providing a data set that is important for future numerical ice-sheet model validation.

Publisher

Geological Society of America

Subject

Geology

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