Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation
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. Using sea-floor geophysical data and marine sediment cores, we resolve the record of past g...
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ftawi:oai:epic.awi.de:46242 2023-05-15T13:45:21+02:00 Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation Graham, Alastair G. C. Kuhn, Gerhard Meisel, Ove Hillenbrand, Claus-Dieter Hodgson, Dominic A. Ehrmann, Werner Wacker, Lukas Wintersteller, Paul dos Santos Ferreira, Christian Römer, Miriam White, Duanne Bohrmann, Gerhard 2017-09 application/pdf https://epic.awi.de/id/eprint/46242/ https://epic.awi.de/id/eprint/46242/1/PAIS17_Graham_et_al_3.pdf https://hdl.handle.net/10013/epic.f42c842d-62e5-44c4-acc1-337560b84c84 https://hdl.handle.net/ unknown SCAR https://epic.awi.de/id/eprint/46242/1/PAIS17_Graham_et_al_3.pdf https://hdl.handle.net/ Graham, A. G. C. , Kuhn, G. orcid:0000-0001-6069-7485 , Meisel, O. , Hillenbrand, C. D. , Hodgson, D. A. , Ehrmann, W. , Wacker, L. , Wintersteller, P. , dos Santos Ferreira, C. , Römer, M. , White, D. and Bohrmann, G. (2017) Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation , Past Antarctic Ice Sheet Dynamics (PAIS) Conference, Trieste, 10 September 0002 - 15 September 2017 . hdl:10013/epic.f42c842d-62e5-44c4-acc1-337560b84c84 EPIC3Past Antarctic Ice Sheet Dynamics (PAIS) Conference, Trieste, 0002-09-10-2017-09-15SCAR Conference notRev 2017 ftawi 2021-12-24T15:43:34Z 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. Using sea-floor geophysical data and marine sediment cores, we resolve the record of past glaciation offshore of South Georgia giving insight into glacier response to climate variability through the transition from the Last Glacial Maximum to Holocene. We show a widespread, coherent sea-bed imprint of shelf-wide ice-sheet advance and retreat in the form of glacially-carved cross-shelf troughs, suites of end and recessional moraines, as well as populations of streamlined bedforms. Glacial troughs began to infill with sediments after c. 18 ka B.P. consistent with interpretations of an extensive last glacial advance and early onset of a progressive, and potentially rapid, deglaciation to coastal limits. A fjord-mouth moraine formed during renewed glacier resurgence between c. 15,170 and 13,340 yrs ago. From the geometry of moraines in adjacent fjords, we infer that many of South Georgia’s glaciers advanced during this period of cooler, wetter climate, known as the Antarctic Cold Reversal, extending the geographic footprint of the cryospheric response to an Antarctic climate pattern 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. Keywords: Sub-Antarctic; ice-cap reconstruction; multibeam bathymetry; sediment cores Conference Object Antarc* Antarctic Ice cap Ice Sheet Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
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. Using sea-floor geophysical data and marine sediment cores, we resolve the record of past glaciation offshore of South Georgia giving insight into glacier response to climate variability through the transition from the Last Glacial Maximum to Holocene. We show a widespread, coherent sea-bed imprint of shelf-wide ice-sheet advance and retreat in the form of glacially-carved cross-shelf troughs, suites of end and recessional moraines, as well as populations of streamlined bedforms. Glacial troughs began to infill with sediments after c. 18 ka B.P. consistent with interpretations of an extensive last glacial advance and early onset of a progressive, and potentially rapid, deglaciation to coastal limits. A fjord-mouth moraine formed during renewed glacier resurgence between c. 15,170 and 13,340 yrs ago. From the geometry of moraines in adjacent fjords, we infer that many of South Georgia’s glaciers advanced during this period of cooler, wetter climate, known as the Antarctic Cold Reversal, extending the geographic footprint of the cryospheric response to an Antarctic climate pattern 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. Keywords: Sub-Antarctic; ice-cap reconstruction; multibeam bathymetry; sediment cores |
format |
Conference Object |
author |
Graham, Alastair G. C. Kuhn, Gerhard Meisel, Ove Hillenbrand, Claus-Dieter Hodgson, Dominic A. Ehrmann, Werner Wacker, Lukas Wintersteller, Paul dos Santos Ferreira, Christian Römer, Miriam White, Duanne Bohrmann, Gerhard |
spellingShingle |
Graham, Alastair G. C. Kuhn, Gerhard Meisel, Ove Hillenbrand, Claus-Dieter Hodgson, Dominic A. Ehrmann, Werner Wacker, Lukas Wintersteller, Paul dos Santos Ferreira, Christian Römer, Miriam White, Duanne Bohrmann, Gerhard Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation |
author_facet |
Graham, Alastair G. C. Kuhn, Gerhard Meisel, Ove Hillenbrand, Claus-Dieter Hodgson, Dominic A. Ehrmann, Werner Wacker, Lukas Wintersteller, Paul dos Santos Ferreira, Christian Römer, Miriam White, Duanne Bohrmann, Gerhard |
author_sort |
Graham, Alastair G. C. |
title |
Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation |
title_short |
Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation |
title_full |
Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation |
title_fullStr |
Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation |
title_full_unstemmed |
Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation |
title_sort |
major advance of south georgia glaciers during the antarctic cold reversal following extensive sub-antarctic glaciation |
publisher |
SCAR |
publishDate |
2017 |
url |
https://epic.awi.de/id/eprint/46242/ https://epic.awi.de/id/eprint/46242/1/PAIS17_Graham_et_al_3.pdf https://hdl.handle.net/10013/epic.f42c842d-62e5-44c4-acc1-337560b84c84 https://hdl.handle.net/ |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice cap Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Ice cap Ice Sheet Southern Ocean |
op_source |
EPIC3Past Antarctic Ice Sheet Dynamics (PAIS) Conference, Trieste, 0002-09-10-2017-09-15SCAR |
op_relation |
https://epic.awi.de/id/eprint/46242/1/PAIS17_Graham_et_al_3.pdf https://hdl.handle.net/ Graham, A. G. C. , Kuhn, G. orcid:0000-0001-6069-7485 , Meisel, O. , Hillenbrand, C. D. , Hodgson, D. A. , Ehrmann, W. , Wacker, L. , Wintersteller, P. , dos Santos Ferreira, C. , Römer, M. , White, D. and Bohrmann, G. (2017) Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation , Past Antarctic Ice Sheet Dynamics (PAIS) Conference, Trieste, 10 September 0002 - 15 September 2017 . hdl:10013/epic.f42c842d-62e5-44c4-acc1-337560b84c84 |
_version_ |
1766221111372021760 |