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Sub-Antartic glacier extensions in the Kerguelen region (49° S, Indian Ocean) over the past 24 000 years constrained by 36Cl moraine dating

Vincent Jomelli 1 Fatima Mokadem 1 Irene Schimmelpfennig 2 Emmanuel Chapron 3, 4 Vincent Rinterknecht 1 Vincent Favier 5 Deborah Verfaillie 5 Daniel Brunstein 1 Claude Legentil 1 Elisabeth Michel 6 Didier Swingedouw 7 Alain Jaouen 8 Georges Aumaitre 2 Didier Bourles 2 Karim Keddadouche 2
1 LGP - Laboratoire de géographie physique : Environnements Quaternaires et Actuels
2 CEREGE - Centre européen de recherche et d'enseignement des géosciences de l'environnement
3 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
4 Biogéosystèmes Continentaux - UMR7327
ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327 : UMR7327
5 LGGE - Laboratoire de glaciologie et géophysique de l'environnement
6 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
7 EPOC - Environnements et Paléoenvironnements OCéaniques
8 IPEV - L'Institut polaire français Paul-Emile Victor
Abstract : Similar to many other regions in the world, glaciers in the southern sub-polar regions are currently retreating. In the Kerguelen islands (49°S, 69°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-Antartic regions. To investigate the deglaciation pattern since the Last Glacial Maximum (LGM) period, we present the first 13 cosmogenic 36Cl surface exposure ages from four sites in the Kerguelen Islands. The 36Cl ages from erratic and moraine boulders span form 24.4 ± 2.7 ka to 0.3 ± 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 Antartic Cold Reversal (ACR) period (-14.5-12.9ka), during which the Bontemps moraine was formed by the advance of a CIC outlet glacier. Deglaciation continued during the Holocene probably until 3ka with evidence of minor advances during the last millennium. The chronology is in pace with major changes in ᵟ18O in a recent West Antarctica ice core record, showing thet Kerguelen Islands glciers are particularly sensitive and relevant to document climate change in the southern polar regions.
Keywords : Kerguelen Holocene late glacial Glacier fluctuations 36 cl cosmic-ray exposure dating
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https://hal-univ-tlse2.archives-ouvertes.fr/hal-01513579
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Submitted on : Tuesday, April 25, 2017 - 11:43:51 AM
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UNIV-TLSE2 | CNRS | UNIV-ORLEANS | OSUG | UVSQ | CDF | UPEC-UPEM | LGGE | EPHE | BRGM | CEA | LSCE | UNIV-AMU | UNIV-PARIS1 | INSU | ISTO | OSUC | IRD | PSL | UGA | UNIV-PARIS-SACLAY | OSU-INSTITUT-PYTHEAS | CEREGE | INRA | CEA-DRF | CEA-UPSAY | OBSPM | IRSTEA | UNIV-SAVOIE | CAMPUS-CONDORCET | UPEC | LGP | INRAE | TP

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Vincent Jomelli, Fatima Mokadem, Irene Schimmelpfennig, Emmanuel Chapron, Vincent Rinterknecht, et al.. Sub-Antartic glacier extensions in the Kerguelen region (49° S, Indian Ocean) over the past 24 000 years constrained by 36Cl moraine dating. Quaternary Science Reviews, Elsevier, 2017, 162, pp.128-144. ⟨10.1016/j.quascirev.2017.03.010⟩. ⟨hal-01513579⟩

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