History of Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part I: Deglacial history based on new sedimentological and chronological data
Reconstructing the advance and retreat of past ice sheets provides important long-term context for recent change(s) and enables us to better understand ice sheet responses to forcing mechanisms and external boundary conditions that regulate grounding line retreat. This study applies various radiocar...
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Online Access: | https://epic.awi.de/id/eprint/57289/ https://doi.org/10.1016/j.quascirev.2022.107590 https://hdl.handle.net/10013/epic.5bc1d70d-ea5f-43ca-a1ad-b04085cdff4c |
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ftawi:oai:epic.awi.de:57289 2024-09-09T19:08:20+00:00 History of Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part I: Deglacial history based on new sedimentological and chronological data Roseby, Zoë A. Smith, James A. Hillenbrand, Claus-Dieter Cartigny, Matthieu J.B. Rosenheim, Brad E. Hogan, Kelly A. Allen, Claire S. Leventer, Amy Kuhn, Gerhard Ehrmann, Werner Larter, Robert D. 2022 https://epic.awi.de/id/eprint/57289/ https://doi.org/10.1016/j.quascirev.2022.107590 https://hdl.handle.net/10013/epic.5bc1d70d-ea5f-43ca-a1ad-b04085cdff4c unknown Roseby, Z. A. , Smith, J. A. , Hillenbrand, C. D. , Cartigny, M. J. , Rosenheim, B. E. , Hogan, K. A. , Allen, C. S. , Leventer, A. , Kuhn, G. orcid:0000-0001-6069-7485 , Ehrmann, W. and Larter, R. D. (2022) History of Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part I: Deglacial history based on new sedimentological and chronological data , Quaternary Science Reviews, 291 , p. 107590 . doi:10.1016/j.quascirev.2022.107590 <https://doi.org/10.1016/j.quascirev.2022.107590> , hdl:10013/epic.5bc1d70d-ea5f-43ca-a1ad-b04085cdff4c EPIC3Quaternary Science Reviews, 291, pp. 107590, ISSN: 02773791 Article isiRev 2022 ftawi https://doi.org/10.1016/j.quascirev.2022.107590 2024-06-24T04:30:12Z Reconstructing the advance and retreat of past ice sheets provides important long-term context for recent change(s) and enables us to better understand ice sheet responses to forcing mechanisms and external boundary conditions that regulate grounding line retreat. This study applies various radiocarbon dating techniques, guided by a detailed sedimentological analyses, to reconstruct the glacial history of Anvers-Hugo Trough (AHT), one of the largest bathymetric troughs on the western Antarctic Peninsula (WAP) shelf. Existing records from AHT indicate that the expanded Antarctic Peninsula Ice Sheet (APIS) advanced to, or close to, the continental shelf edge during the Last Glacial Maximum (LGM; 23-19 cal kyr BP [ = calibrated kiloyears before present]), with deglaciation of the outer shelf after ∼16.3 cal kyr BP. Our new chronological data show that the APIS had retreated to the middle shelf by ∼15.7 cal kyr BP. Over this 600-year interval, two large grounding-zone wedges (GZW) were deposited across the middle (GZW2) and inner shelf (GZW3), suggesting that their formation occurred on centennial rather than millennial timescales. Expanded sequences of sub-ice shelf sediments occur seaward of the inner GZW3, which suggests that the grounding line remained stationary for a prolonged period over the middle shelf. Grounding-line retreat rates indicate faster retreat across the outer to middle shelf compared to retreat across the middle to inner shelf. We suggest that variable retreat rates relate to the broad-scale morphology of the trough, which is characterised by a relatively smooth, retrograde seabed on the outer to middle shelf and rugged morphology with a locally landward shallowing bed and deep basin on the inner shelf. A slowdown in retreat rate could also have been promoted by convergent ice flow over the inner shelf and the availability of pinning points associated with bathymetric highs around Anvers Island and Hugo Island. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Anvers Island Hugo Island Ice Sheet Ice Shelf Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Antarctic Peninsula Anvers ENVELOPE(-63.500,-63.500,-64.600,-64.600) Anvers Island ENVELOPE(-63.500,-63.500,-64.600,-64.600) Hugo Island ENVELOPE(-65.750,-65.750,-64.950,-64.950) Quaternary Science Reviews 291 107590 |
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 |
Reconstructing the advance and retreat of past ice sheets provides important long-term context for recent change(s) and enables us to better understand ice sheet responses to forcing mechanisms and external boundary conditions that regulate grounding line retreat. This study applies various radiocarbon dating techniques, guided by a detailed sedimentological analyses, to reconstruct the glacial history of Anvers-Hugo Trough (AHT), one of the largest bathymetric troughs on the western Antarctic Peninsula (WAP) shelf. Existing records from AHT indicate that the expanded Antarctic Peninsula Ice Sheet (APIS) advanced to, or close to, the continental shelf edge during the Last Glacial Maximum (LGM; 23-19 cal kyr BP [ = calibrated kiloyears before present]), with deglaciation of the outer shelf after ∼16.3 cal kyr BP. Our new chronological data show that the APIS had retreated to the middle shelf by ∼15.7 cal kyr BP. Over this 600-year interval, two large grounding-zone wedges (GZW) were deposited across the middle (GZW2) and inner shelf (GZW3), suggesting that their formation occurred on centennial rather than millennial timescales. Expanded sequences of sub-ice shelf sediments occur seaward of the inner GZW3, which suggests that the grounding line remained stationary for a prolonged period over the middle shelf. Grounding-line retreat rates indicate faster retreat across the outer to middle shelf compared to retreat across the middle to inner shelf. We suggest that variable retreat rates relate to the broad-scale morphology of the trough, which is characterised by a relatively smooth, retrograde seabed on the outer to middle shelf and rugged morphology with a locally landward shallowing bed and deep basin on the inner shelf. A slowdown in retreat rate could also have been promoted by convergent ice flow over the inner shelf and the availability of pinning points associated with bathymetric highs around Anvers Island and Hugo Island. |
format |
Article in Journal/Newspaper |
author |
Roseby, Zoë A. Smith, James A. Hillenbrand, Claus-Dieter Cartigny, Matthieu J.B. Rosenheim, Brad E. Hogan, Kelly A. Allen, Claire S. Leventer, Amy Kuhn, Gerhard Ehrmann, Werner Larter, Robert D. |
spellingShingle |
Roseby, Zoë A. Smith, James A. Hillenbrand, Claus-Dieter Cartigny, Matthieu J.B. Rosenheim, Brad E. Hogan, Kelly A. Allen, Claire S. Leventer, Amy Kuhn, Gerhard Ehrmann, Werner Larter, Robert D. History of Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part I: Deglacial history based on new sedimentological and chronological data |
author_facet |
Roseby, Zoë A. Smith, James A. Hillenbrand, Claus-Dieter Cartigny, Matthieu J.B. Rosenheim, Brad E. Hogan, Kelly A. Allen, Claire S. Leventer, Amy Kuhn, Gerhard Ehrmann, Werner Larter, Robert D. |
author_sort |
Roseby, Zoë A. |
title |
History of Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part I: Deglacial history based on new sedimentological and chronological data |
title_short |
History of Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part I: Deglacial history based on new sedimentological and chronological data |
title_full |
History of Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part I: Deglacial history based on new sedimentological and chronological data |
title_fullStr |
History of Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part I: Deglacial history based on new sedimentological and chronological data |
title_full_unstemmed |
History of Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part I: Deglacial history based on new sedimentological and chronological data |
title_sort |
history of anvers-hugo trough, western antarctic peninsula shelf, since the last glacial maximum. part i: deglacial history based on new sedimentological and chronological data |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/57289/ https://doi.org/10.1016/j.quascirev.2022.107590 https://hdl.handle.net/10013/epic.5bc1d70d-ea5f-43ca-a1ad-b04085cdff4c |
long_lat |
ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(-65.750,-65.750,-64.950,-64.950) |
geographic |
Antarctic Antarctic Peninsula Anvers Anvers Island Hugo Island |
geographic_facet |
Antarctic Antarctic Peninsula Anvers Anvers Island Hugo Island |
genre |
Antarc* Antarctic Antarctic Peninsula Anvers Island Hugo Island Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Anvers Island Hugo Island Ice Sheet Ice Shelf |
op_source |
EPIC3Quaternary Science Reviews, 291, pp. 107590, ISSN: 02773791 |
op_relation |
Roseby, Z. A. , Smith, J. A. , Hillenbrand, C. D. , Cartigny, M. J. , Rosenheim, B. E. , Hogan, K. A. , Allen, C. S. , Leventer, A. , Kuhn, G. orcid:0000-0001-6069-7485 , Ehrmann, W. and Larter, R. D. (2022) History of Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part I: Deglacial history based on new sedimentological and chronological data , Quaternary Science Reviews, 291 , p. 107590 . doi:10.1016/j.quascirev.2022.107590 <https://doi.org/10.1016/j.quascirev.2022.107590> , hdl:10013/epic.5bc1d70d-ea5f-43ca-a1ad-b04085cdff4c |
op_doi |
https://doi.org/10.1016/j.quascirev.2022.107590 |
container_title |
Quaternary Science Reviews |
container_volume |
291 |
container_start_page |
107590 |
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1809822558964416512 |