History of 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...
Published in: | Geology |
---|---|
Main Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Geological Society of America
2021
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/529819/ https://nora.nerc.ac.uk/id/eprint/529819/1/g48503.pdf https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G48503.1/596504/History-of-the-Larsen-C-Ice-Shelf-reconstructed |
id |
ftnerc:oai:nora.nerc.ac.uk:529819 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:529819 2023-05-15T13:41:45+02:00 History of Larsen C Ice Shelf reconstructed from sub-ice shelf and offshore sediments Smith, J.A. Hillenbrand, C.-D. Subt, C. Rosenheim, B.E. Frederichs, T. Ehrmann, W. Andersen, T.J. Wacker, L. Makinson, K. Anker, P. Venables, E.J. Nicholls, K.W. 2021-08-01 text http://nora.nerc.ac.uk/id/eprint/529819/ https://nora.nerc.ac.uk/id/eprint/529819/1/g48503.pdf https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G48503.1/596504/History-of-the-Larsen-C-Ice-Shelf-reconstructed en eng Geological Society of America https://nora.nerc.ac.uk/id/eprint/529819/1/g48503.pdf Smith, J.A. orcid:0000-0002-1333-2544 Hillenbrand, C.-D. orcid:0000-0003-0240-7317 Subt, C.; Rosenheim, B.E.; Frederichs, T.; Ehrmann, W.; Andersen, T.J.; Wacker, L.; Makinson, K. orcid:0000-0002-5791-1767 Anker, P. orcid:0000-0002-4359-4342 Venables, E.J.; Nicholls, K.W. orcid:0000-0002-2188-4509 . 2021 History of Larsen C Ice Shelf reconstructed from sub-ice shelf and offshore sediments. Geology, 49 (8). 978-982. https://doi.org/10.1130/G48503.1 <https://doi.org/10.1130/G48503.1> cc_by_4 CC-BY Publication - Article PeerReviewed 2021 ftnerc https://doi.org/10.1130/G48503.1 2023-02-04T19:51:49Z 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 Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Geology 49 8 978 982 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
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, J.A. Hillenbrand, C.-D. Subt, C. Rosenheim, B.E. Frederichs, T. Ehrmann, W. Andersen, T.J. Wacker, L. Makinson, K. Anker, P. Venables, E.J. Nicholls, K.W. |
spellingShingle |
Smith, J.A. Hillenbrand, C.-D. Subt, C. Rosenheim, B.E. Frederichs, T. Ehrmann, W. Andersen, T.J. Wacker, L. Makinson, K. Anker, P. Venables, E.J. Nicholls, K.W. History of Larsen C Ice Shelf reconstructed from sub-ice shelf and offshore sediments |
author_facet |
Smith, J.A. Hillenbrand, C.-D. Subt, C. Rosenheim, B.E. Frederichs, T. Ehrmann, W. Andersen, T.J. Wacker, L. Makinson, K. Anker, P. Venables, E.J. Nicholls, K.W. |
author_sort |
Smith, J.A. |
title |
History of Larsen C Ice Shelf reconstructed from sub-ice shelf and offshore sediments |
title_short |
History of Larsen C Ice Shelf reconstructed from sub-ice shelf and offshore sediments |
title_full |
History of Larsen C Ice Shelf reconstructed from sub-ice shelf and offshore sediments |
title_fullStr |
History of Larsen C Ice Shelf reconstructed from sub-ice shelf and offshore sediments |
title_full_unstemmed |
History of Larsen C Ice Shelf reconstructed from sub-ice shelf and offshore sediments |
title_sort |
history of larsen c ice shelf reconstructed from sub-ice shelf and offshore sediments |
publisher |
Geological Society of America |
publishDate |
2021 |
url |
http://nora.nerc.ac.uk/id/eprint/529819/ https://nora.nerc.ac.uk/id/eprint/529819/1/g48503.pdf https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G48503.1/596504/History-of-the-Larsen-C-Ice-Shelf-reconstructed |
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 |
https://nora.nerc.ac.uk/id/eprint/529819/1/g48503.pdf Smith, J.A. orcid:0000-0002-1333-2544 Hillenbrand, C.-D. orcid:0000-0003-0240-7317 Subt, C.; Rosenheim, B.E.; Frederichs, T.; Ehrmann, W.; Andersen, T.J.; Wacker, L.; Makinson, K. orcid:0000-0002-5791-1767 Anker, P. orcid:0000-0002-4359-4342 Venables, E.J.; Nicholls, K.W. orcid:0000-0002-2188-4509 . 2021 History of Larsen C Ice Shelf reconstructed from sub-ice shelf and offshore sediments. Geology, 49 (8). 978-982. https://doi.org/10.1130/G48503.1 <https://doi.org/10.1130/G48503.1> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
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_ |
1766157320790736896 |