期刊
QUATERNARY SCIENCE REVIEWS
卷 162, 期 -, 页码 128-144出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2017.03.010
关键词
Glacier fluctuations; Cl-36 cosmic-ray exposure dating; Late Glacial; Holocene; Kerguelen
资金
- French INSU LEFE Glacepreker project
- IPEV Kesaaco 1048 project
- ARTEMIS radiocarbon French facilities from CNRS INSU
- INSU/CNRS
- ANR through the Projets thematiques d'excellence program
- Equipements d'excellence ASTER-CEREGE action
- IRD
Similar to many other regions in the world, glaciers in the southern sub-polar regions are currently retreating. In the Kerguelen Islands (49 degrees S, 69 degrees E), the mass balance of the Cook Ice Cap (CIC), the largest ice cap in this region, experienced dramatic shrinking between 1960 and 2013 with retreat rates among the highest in the world. This observation needs to be evaluated in a long-term context. However, data on the past glacier extents are sparse in the sub-Antarctic regions. To investigate the deglaciation pattern since the Last Glacial Maximum (LGM) period, we present the first 13 cosmogenic Cl-36 surface exposure ages from four sites in the Kerguelen Islands. The Cl-36 ages from erratic and moraine boulders span from 24.4 +/- 2.7 ka to 03 +/- 0.1 ka. We combined these ages with existing glacio-marine radiocarbon ages and bathymetric data to document the temporal and spatial changes of the island's glacial history. Ice began to retreat on the main island before 24.4 +/- 2.7 ka until around the time of the Antarctic Cold Reversal (ACR) period (-14.5-12.9 ka), during which the Bontemps moraine was formed by the advance of a CIC outlet glacier. Deglaciation continued during the Holocene probably until 3 ka with evidence of minor advances during the last millennium. This chronology is in pace with major changes in delta O-18 in a recent West Antarctica ice core record, showing that Kerguelen Islands glaciers are particularly sensitive and relevant to document climate change in the southern polar regions. (C) 2017 Elsevier Ltd. All rights reserved.
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