Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation
dos Santos Ferreira, C
Nature Publishing Group
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The history of glaciations on Southern Hemisphere sub-polar islands is unclear. Debate surrounds the extent and timing of the last glacial advance and termination on sub-Antarctic South Georgia in particular. Here, using sea-floor geophysical data and marine sediment cores, we resolve the record of glaciation offshore of South Georgia through the transition from the Last Glacial Maximum to Holocene. We show a sea-bed landform imprint of a shelf-wide last glacial advance and progressive deglaciation. Renewed glacier resurgence in the fjords between c. 15,170 and 13,340 yr ago coincided with a period of cooler, wetter climate known as the Antarctic Cold Reversal, revealing a cryospheric response to an Antarctic climate pattern extending into the Atlantic sector of the Southern Ocean. We conclude that the last glaciation of South Georgia was extensive, and the sensitivity of its glaciers to climate variability during the last termination more significant than implied by previous studies.
A.G. was supported by grants NE/K000527/1 and NE/K000527/2 from the Natural Environment Research Council (NERC), and by the British Antarctic Survey ‘Ice Sheets’ programme. The latter also supported contributions from D.A.H. and C.D.H. Fieldwork was supported by the Deutsche Forschungsgemeinschaft (DFG) in the framework of the priority programme ‘Antarctic Research with comparative investigations in Arctic ice areas’ by grant BO 1049/19. G.K. was supported by the Alfred-Wegener-Institute, Helmholtz Centre PACES II (Polar Regions and Coasts in the changing Earth System) programme, and by the European Commission under the 7th Framework Programme through the Action IMCONet (FP7 IRSES, action no. 319718).
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Vol. 8, Article number: 14798
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