History of the Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part II: Palaeo-productivity and palaeoceanographic changes during the Last Glacial Transition
Following the Last Glacial Maximum (LGM; ca. 23-19 calibrated [cal.] kyr before present [BP]), atmospheric and oceanic warming, together with global sea-level rise, drove widespread deglaciation of the Antarctic Ice Sheet, increasing the flux of freshwater to the ocean and leading to substantial cha...
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ftnerc:oai:nora.nerc.ac.uk:532165 2023-05-15T13:41:46+02:00 History of the Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part II: Palaeo-productivity and palaeoceanographic changes during the Last Glacial Transition Roseby, Zoë A. Smith, James A. Hillenbrand, Claus-Dieter Allen, Claire S. Leventer, Amy Hogan, Kelly Cartigny, Matthieu J.B. Rosenheim, Brad E. Kuhn, Gerhard Larter, Robert D. 2022-09-01 text http://nora.nerc.ac.uk/id/eprint/532165/ https://nora.nerc.ac.uk/id/eprint/532165/1/1-s2.0-S0277379122001342-main.pdf https://www.sciencedirect.com/science/article/pii/S0277379122001342 en eng Elsevier https://nora.nerc.ac.uk/id/eprint/532165/1/1-s2.0-S0277379122001342-main.pdf Roseby, Zoë A. orcid:0000-0003-1151-0172 Smith, James A. orcid:0000-0002-1333-2544 Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Allen, Claire S. orcid:0000-0002-0938-0551 Leventer, Amy; Hogan, Kelly orcid:0000-0002-1256-8010 Cartigny, Matthieu J.B.; Rosenheim, Brad E.; Kuhn, Gerhard; Larter, Robert D. orcid:0000-0002-8414-7389 . 2022 History of the Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part II: Palaeo-productivity and palaeoceanographic changes during the Last Glacial Transition. Quaternary Science Reviews, 294, 107503. 18, pp. https://doi.org/10.1016/j.quascirev.2022.107503 <https://doi.org/10.1016/j.quascirev.2022.107503> cc_by_4 CC-BY Publication - Article PeerReviewed 2022 ftnerc https://doi.org/10.1016/j.quascirev.2022.107503 2023-02-04T19:53:03Z Following the Last Glacial Maximum (LGM; ca. 23-19 calibrated [cal.] kyr before present [BP]), atmospheric and oceanic warming, together with global sea-level rise, drove widespread deglaciation of the Antarctic Ice Sheet, increasing the flux of freshwater to the ocean and leading to substantial changes in marine biological productivity. On the Antarctic continental shelf, periods of elevated biological productivity, often preserved in the sediment record as laminated (and sometimes varved) diatomaceous oozes (LDO), have been reported from several locations and are typically associated with the formation of calving bay re-entrants during ice sheet retreat. Understanding what drives the formation and deposition of LDOs, and the impact of deglacial processes on biogenic productivity more generally, can help inform how Antarctic coastal environments will respond to current and future ice sheet melting. In this study we utilise a suite of sediment cores recovered from Anvers-Hugo Trough (AHT), western Antarctic Peninsula shelf, which documents the transition from subglacial to glacimarine conditions following retreat of an expanded ice stream after the LGM. We present quantitative absolute diatom abundance (ADA) and species assemblage data, to investigate changes in biological productivity during the Last Glacial Transition (19-11 cal kyr BP). In combination with radiocarbon dating, we show that seasonally open marine conditions were established on the mid-shelf by 13.6 cal kyr BP, but LDOs did not start to accumulate until ∼11.5 cal kyr BP. The ∼1.4 kyr delay between the onset of seasonally open marine conditions and LDO deposition indicates that physiographic changes, and specifically the establishment of a calving bay in AHT, is insufficient to explain LDO deposition alone. LDO deposition in AHT coincides with the early Holocene climatic optimum (∼11.5 – 9.0 kyr) and is therefore explained in terms of increased atmospheric/ocean temperatures, high rates of sea and glacial ice melt and the formation of a ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice Sheet Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Anvers ENVELOPE(-63.500,-63.500,-64.600,-64.600) Quaternary Science Reviews 107503 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Following the Last Glacial Maximum (LGM; ca. 23-19 calibrated [cal.] kyr before present [BP]), atmospheric and oceanic warming, together with global sea-level rise, drove widespread deglaciation of the Antarctic Ice Sheet, increasing the flux of freshwater to the ocean and leading to substantial changes in marine biological productivity. On the Antarctic continental shelf, periods of elevated biological productivity, often preserved in the sediment record as laminated (and sometimes varved) diatomaceous oozes (LDO), have been reported from several locations and are typically associated with the formation of calving bay re-entrants during ice sheet retreat. Understanding what drives the formation and deposition of LDOs, and the impact of deglacial processes on biogenic productivity more generally, can help inform how Antarctic coastal environments will respond to current and future ice sheet melting. In this study we utilise a suite of sediment cores recovered from Anvers-Hugo Trough (AHT), western Antarctic Peninsula shelf, which documents the transition from subglacial to glacimarine conditions following retreat of an expanded ice stream after the LGM. We present quantitative absolute diatom abundance (ADA) and species assemblage data, to investigate changes in biological productivity during the Last Glacial Transition (19-11 cal kyr BP). In combination with radiocarbon dating, we show that seasonally open marine conditions were established on the mid-shelf by 13.6 cal kyr BP, but LDOs did not start to accumulate until ∼11.5 cal kyr BP. The ∼1.4 kyr delay between the onset of seasonally open marine conditions and LDO deposition indicates that physiographic changes, and specifically the establishment of a calving bay in AHT, is insufficient to explain LDO deposition alone. LDO deposition in AHT coincides with the early Holocene climatic optimum (∼11.5 – 9.0 kyr) and is therefore explained in terms of increased atmospheric/ocean temperatures, high rates of sea and glacial ice melt and the formation of a ... |
format |
Article in Journal/Newspaper |
author |
Roseby, Zoë A. Smith, James A. Hillenbrand, Claus-Dieter Allen, Claire S. Leventer, Amy Hogan, Kelly Cartigny, Matthieu J.B. Rosenheim, Brad E. Kuhn, Gerhard Larter, Robert D. |
spellingShingle |
Roseby, Zoë A. Smith, James A. Hillenbrand, Claus-Dieter Allen, Claire S. Leventer, Amy Hogan, Kelly Cartigny, Matthieu J.B. Rosenheim, Brad E. Kuhn, Gerhard Larter, Robert D. History of the Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part II: Palaeo-productivity and palaeoceanographic changes during the Last Glacial Transition |
author_facet |
Roseby, Zoë A. Smith, James A. Hillenbrand, Claus-Dieter Allen, Claire S. Leventer, Amy Hogan, Kelly Cartigny, Matthieu J.B. Rosenheim, Brad E. Kuhn, Gerhard Larter, Robert D. |
author_sort |
Roseby, Zoë A. |
title |
History of the Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part II: Palaeo-productivity and palaeoceanographic changes during the Last Glacial Transition |
title_short |
History of the Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part II: Palaeo-productivity and palaeoceanographic changes during the Last Glacial Transition |
title_full |
History of the Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part II: Palaeo-productivity and palaeoceanographic changes during the Last Glacial Transition |
title_fullStr |
History of the Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part II: Palaeo-productivity and palaeoceanographic changes during the Last Glacial Transition |
title_full_unstemmed |
History of the Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part II: Palaeo-productivity and palaeoceanographic changes during the Last Glacial Transition |
title_sort |
history of the anvers-hugo trough, western antarctic peninsula shelf, since the last glacial maximum. part ii: palaeo-productivity and palaeoceanographic changes during the last glacial transition |
publisher |
Elsevier |
publishDate |
2022 |
url |
http://nora.nerc.ac.uk/id/eprint/532165/ https://nora.nerc.ac.uk/id/eprint/532165/1/1-s2.0-S0277379122001342-main.pdf https://www.sciencedirect.com/science/article/pii/S0277379122001342 |
long_lat |
ENVELOPE(-63.500,-63.500,-64.600,-64.600) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Anvers |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Anvers |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Sheet |
op_relation |
https://nora.nerc.ac.uk/id/eprint/532165/1/1-s2.0-S0277379122001342-main.pdf Roseby, Zoë A. orcid:0000-0003-1151-0172 Smith, James A. orcid:0000-0002-1333-2544 Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Allen, Claire S. orcid:0000-0002-0938-0551 Leventer, Amy; Hogan, Kelly orcid:0000-0002-1256-8010 Cartigny, Matthieu J.B.; Rosenheim, Brad E.; Kuhn, Gerhard; Larter, Robert D. orcid:0000-0002-8414-7389 . 2022 History of the Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part II: Palaeo-productivity and palaeoceanographic changes during the Last Glacial Transition. Quaternary Science Reviews, 294, 107503. 18, pp. https://doi.org/10.1016/j.quascirev.2022.107503 <https://doi.org/10.1016/j.quascirev.2022.107503> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.quascirev.2022.107503 |
container_title |
Quaternary Science Reviews |
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107503 |
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