Reduced oxygenation at intermediate depths of the southwest Pacific during the last glacial maximum
To investigate changes in oxygenation at intermediate depths in the southwest Pacific between the Last Glacial Maximum (LGM) and the Holocene, redox sensitive elements uranium and rhenium were measured in 12 sediment cores located on the Campbell and Challenger plateaux offshore from New Zealand. Th...
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ftunivbern:oai:boris.unibe.ch:113832 2023-08-20T04:01:51+02:00 Reduced oxygenation at intermediate depths of the southwest Pacific during the last glacial maximum Durand, Axel Chase, Zanna Noble, Taryn Bostock, Helen Jaccard, Samuel Townsend, Ashley Bindoff, Nathaniel Neil, Helen Jacobsen, Geraldine 2018-03-27 application/pdf https://boris.unibe.ch/113832/1/Durand%20et%20al.,%2018.pdf https://boris.unibe.ch/113832/ eng eng Elsevier https://boris.unibe.ch/113832/ info:eu-repo/semantics/restrictedAccess Durand, Axel; Chase, Zanna; Noble, Taryn; Bostock, Helen; Jaccard, Samuel; Townsend, Ashley; Bindoff, Nathaniel; Neil, Helen; Jacobsen, Geraldine (2018). Reduced oxygenation at intermediate depths of the southwest Pacific during the last glacial maximum. Earth and planetary science letters, 491, pp. 48-57. Elsevier 10.1016/j.epsl.2018.03.036 <http://dx.doi.org/10.1016/j.epsl.2018.03.036> 550 Earth sciences & geology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2018 ftunivbern https://doi.org/10.1016/j.epsl.2018.03.036 2023-07-31T21:42:38Z To investigate changes in oxygenation at intermediate depths in the southwest Pacific between the Last Glacial Maximum (LGM) and the Holocene, redox sensitive elements uranium and rhenium were measured in 12 sediment cores located on the Campbell and Challenger plateaux offshore from New Zealand. The core sites are currently bathed by Subantarctic Mode Water (SAMW), Antarctic Intermediate Water (AAIW) and Upper Circumpolar Deep Water (UCDW). The sedimentary distributions of authigenic uranium and rhenium reveal reduced oxygen content at intermediate depths (800–1500 m) during the LGM compared to the Holocene. In contrast, data from deeper waters (≥1500 m) indicate higher oxygen content during the LGM compared to the Holocene. These data, together with variations in benthic foraminiferal δ13C, are consistent with a shallower AAIW–UCDW boundary over the Campbell Plateau during the LGM. Whilst AAIW continued to bathe the intermediate depths (≤1500 m) of the Challenger Plateau during the LGM, the data suggest that the AAIW at these core sites contained less oxygen compared to the Holocene. These results are at odds with the general notion that AAIW was better oxygenated and expanded deeper during the LGM due to stronger westerlies and colder temperatures. These findings may be explained by an important change in AAIW formation and circulation. Article in Journal/Newspaper Antarc* Antarctic BORIS (Bern Open Repository and Information System, University of Bern) Antarctic Campbell Plateau ENVELOPE(171.000,171.000,-50.667,-50.667) New Zealand Pacific Earth and Planetary Science Letters 491 48 57 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
550 Earth sciences & geology |
spellingShingle |
550 Earth sciences & geology Durand, Axel Chase, Zanna Noble, Taryn Bostock, Helen Jaccard, Samuel Townsend, Ashley Bindoff, Nathaniel Neil, Helen Jacobsen, Geraldine Reduced oxygenation at intermediate depths of the southwest Pacific during the last glacial maximum |
topic_facet |
550 Earth sciences & geology |
description |
To investigate changes in oxygenation at intermediate depths in the southwest Pacific between the Last Glacial Maximum (LGM) and the Holocene, redox sensitive elements uranium and rhenium were measured in 12 sediment cores located on the Campbell and Challenger plateaux offshore from New Zealand. The core sites are currently bathed by Subantarctic Mode Water (SAMW), Antarctic Intermediate Water (AAIW) and Upper Circumpolar Deep Water (UCDW). The sedimentary distributions of authigenic uranium and rhenium reveal reduced oxygen content at intermediate depths (800–1500 m) during the LGM compared to the Holocene. In contrast, data from deeper waters (≥1500 m) indicate higher oxygen content during the LGM compared to the Holocene. These data, together with variations in benthic foraminiferal δ13C, are consistent with a shallower AAIW–UCDW boundary over the Campbell Plateau during the LGM. Whilst AAIW continued to bathe the intermediate depths (≤1500 m) of the Challenger Plateau during the LGM, the data suggest that the AAIW at these core sites contained less oxygen compared to the Holocene. These results are at odds with the general notion that AAIW was better oxygenated and expanded deeper during the LGM due to stronger westerlies and colder temperatures. These findings may be explained by an important change in AAIW formation and circulation. |
format |
Article in Journal/Newspaper |
author |
Durand, Axel Chase, Zanna Noble, Taryn Bostock, Helen Jaccard, Samuel Townsend, Ashley Bindoff, Nathaniel Neil, Helen Jacobsen, Geraldine |
author_facet |
Durand, Axel Chase, Zanna Noble, Taryn Bostock, Helen Jaccard, Samuel Townsend, Ashley Bindoff, Nathaniel Neil, Helen Jacobsen, Geraldine |
author_sort |
Durand, Axel |
title |
Reduced oxygenation at intermediate depths of the southwest Pacific during the last glacial maximum |
title_short |
Reduced oxygenation at intermediate depths of the southwest Pacific during the last glacial maximum |
title_full |
Reduced oxygenation at intermediate depths of the southwest Pacific during the last glacial maximum |
title_fullStr |
Reduced oxygenation at intermediate depths of the southwest Pacific during the last glacial maximum |
title_full_unstemmed |
Reduced oxygenation at intermediate depths of the southwest Pacific during the last glacial maximum |
title_sort |
reduced oxygenation at intermediate depths of the southwest pacific during the last glacial maximum |
publisher |
Elsevier |
publishDate |
2018 |
url |
https://boris.unibe.ch/113832/1/Durand%20et%20al.,%2018.pdf https://boris.unibe.ch/113832/ |
long_lat |
ENVELOPE(171.000,171.000,-50.667,-50.667) |
geographic |
Antarctic Campbell Plateau New Zealand Pacific |
geographic_facet |
Antarctic Campbell Plateau New Zealand Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Durand, Axel; Chase, Zanna; Noble, Taryn; Bostock, Helen; Jaccard, Samuel; Townsend, Ashley; Bindoff, Nathaniel; Neil, Helen; Jacobsen, Geraldine (2018). Reduced oxygenation at intermediate depths of the southwest Pacific during the last glacial maximum. Earth and planetary science letters, 491, pp. 48-57. Elsevier 10.1016/j.epsl.2018.03.036 <http://dx.doi.org/10.1016/j.epsl.2018.03.036> |
op_relation |
https://boris.unibe.ch/113832/ |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2018.03.036 |
container_title |
Earth and Planetary Science Letters |
container_volume |
491 |
container_start_page |
48 |
op_container_end_page |
57 |
_version_ |
1774712221830479872 |