History of the Larsen C Ice Shelf reconstructed from sub–ice shelf and offshore sediments
Because ice shelves respond to climatic forcing over a range of time scales, from years to millennia, an understanding of their long-term history is critically needed for predicting their future evolution. We present the first detailed reconstruction of the Larsen C Ice Shelf (LCIS), eastern Antarct...
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Geological Society of America
2021
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Online Access: | https://hdl.handle.net/10037/24148 https://doi.org/10.1130/G48503.1 |
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ftunivtroemsoe:oai:munin.uit.no:10037/24148 2023-05-15T13:45:59+02:00 History of the Larsen C Ice Shelf reconstructed from sub–ice shelf and offshore sediments Smith, James A. Hillenbrand, Claus-Dieter Subt, C. Rosenheim, B.E. Frederichs, Thomas Ehrmann, Werner Andersen, Thorbjørn Joest Wacker, Lukas Makinson, K. Anker, P. Venables, Emily Joanne Nicholls, Keith W. 2021-04-28 https://hdl.handle.net/10037/24148 https://doi.org/10.1130/G48503.1 eng eng Geological Society of America Geology Smith, Hillenbrand, Subt, Rosenheim, Frederichs, Ehrmann, Andersen, Wacker, Makinson, Anker, Venables, Nicholls. History of the Larsen C Ice Shelf reconstructed from sub–ice shelf and offshore sediments. Geology. 2021;49(8):978-982 FRIDAID 2003786 doi:10.1130/G48503.1 0091-7613 1943-2682 https://hdl.handle.net/10037/24148 openAccess Copyright 2021 The Author(s) Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2021 ftunivtroemsoe https://doi.org/10.1130/G48503.1 2022-03-02T23:57:49Z Because ice shelves respond to climatic forcing over a range of time scales, from years to millennia, an understanding of their long-term history is critically needed for predicting their future evolution. We present the first detailed reconstruction of the Larsen C Ice Shelf (LCIS), eastern Antarctic Peninsula (AP), based on data from sediment cores recovered from below and in front of the ice shelf. Sedimentologic and chronologic information reveals that the grounding line (GL) of an expanded AP ice sheet had started its retreat from the midshelf prior to 17.7 ± 0.53 calibrated (cal.) kyr B.P., with the calving line following ∼6 k.y. later. The GL had reached the inner shelf as early as 9.83 ± 0.85 cal. kyr B.P. Since ca. 7.3 ka, the ice shelf has undergone two phases of retreat but without collapse, indicating that the climatic limit of LCIS stability was not breached during the Holocene. Future collapse of the LCIS would therefore confirm that the magnitudes of both ice loss along the eastern AP and underlying climatic forcing are unprecedented during the past 11.5 k.y. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelf Ice Shelves University of Tromsø: Munin Open Research Archive Antarctic Antarctic Peninsula Geology 49 8 978 982 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
Because ice shelves respond to climatic forcing over a range of time scales, from years to millennia, an understanding of their long-term history is critically needed for predicting their future evolution. We present the first detailed reconstruction of the Larsen C Ice Shelf (LCIS), eastern Antarctic Peninsula (AP), based on data from sediment cores recovered from below and in front of the ice shelf. Sedimentologic and chronologic information reveals that the grounding line (GL) of an expanded AP ice sheet had started its retreat from the midshelf prior to 17.7 ± 0.53 calibrated (cal.) kyr B.P., with the calving line following ∼6 k.y. later. The GL had reached the inner shelf as early as 9.83 ± 0.85 cal. kyr B.P. Since ca. 7.3 ka, the ice shelf has undergone two phases of retreat but without collapse, indicating that the climatic limit of LCIS stability was not breached during the Holocene. Future collapse of the LCIS would therefore confirm that the magnitudes of both ice loss along the eastern AP and underlying climatic forcing are unprecedented during the past 11.5 k.y. |
format |
Article in Journal/Newspaper |
author |
Smith, James A. Hillenbrand, Claus-Dieter Subt, C. Rosenheim, B.E. Frederichs, Thomas Ehrmann, Werner Andersen, Thorbjørn Joest Wacker, Lukas Makinson, K. Anker, P. Venables, Emily Joanne Nicholls, Keith W. |
spellingShingle |
Smith, James A. Hillenbrand, Claus-Dieter Subt, C. Rosenheim, B.E. Frederichs, Thomas Ehrmann, Werner Andersen, Thorbjørn Joest Wacker, Lukas Makinson, K. Anker, P. Venables, Emily Joanne Nicholls, Keith W. History of the Larsen C Ice Shelf reconstructed from sub–ice shelf and offshore sediments |
author_facet |
Smith, James A. Hillenbrand, Claus-Dieter Subt, C. Rosenheim, B.E. Frederichs, Thomas Ehrmann, Werner Andersen, Thorbjørn Joest Wacker, Lukas Makinson, K. Anker, P. Venables, Emily Joanne Nicholls, Keith W. |
author_sort |
Smith, James A. |
title |
History of the Larsen C Ice Shelf reconstructed from sub–ice shelf and offshore sediments |
title_short |
History of the Larsen C Ice Shelf reconstructed from sub–ice shelf and offshore sediments |
title_full |
History of the Larsen C Ice Shelf reconstructed from sub–ice shelf and offshore sediments |
title_fullStr |
History of the Larsen C Ice Shelf reconstructed from sub–ice shelf and offshore sediments |
title_full_unstemmed |
History of the Larsen C Ice Shelf reconstructed from sub–ice shelf and offshore sediments |
title_sort |
history of the larsen c ice shelf reconstructed from sub–ice shelf and offshore sediments |
publisher |
Geological Society of America |
publishDate |
2021 |
url |
https://hdl.handle.net/10037/24148 https://doi.org/10.1130/G48503.1 |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelf Ice Shelves |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelf Ice Shelves |
op_relation |
Geology Smith, Hillenbrand, Subt, Rosenheim, Frederichs, Ehrmann, Andersen, Wacker, Makinson, Anker, Venables, Nicholls. History of the Larsen C Ice Shelf reconstructed from sub–ice shelf and offshore sediments. Geology. 2021;49(8):978-982 FRIDAID 2003786 doi:10.1130/G48503.1 0091-7613 1943-2682 https://hdl.handle.net/10037/24148 |
op_rights |
openAccess Copyright 2021 The Author(s) |
op_doi |
https://doi.org/10.1130/G48503.1 |
container_title |
Geology |
container_volume |
49 |
container_issue |
8 |
container_start_page |
978 |
op_container_end_page |
982 |
_version_ |
1766234635333795840 |