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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ftarchimer:oai:archimer.ifremer.fr:60703 2023-05-15T13:47:36+02:00 Reduced oxygenation at intermediate depths of the southwest Pacific during the last glacial maximum Durand, Axel Chase, Zanna Noble, Taryn L. Bostock, Helen Jaccard, Samuel L. Townsend, Ashley T. Bindoff, Nathaniel L. Neil, Helen Jacobsen, Geraldine 2018-06 application/pdf https://archimer.ifremer.fr/doc/00495/60703/83612.pdf https://doi.org/10.1016/j.epsl.2018.03.036 https://archimer.ifremer.fr/doc/00495/60703/ eng eng Elsevier Science Bv https://archimer.ifremer.fr/doc/00495/60703/83612.pdf doi:10.1016/j.epsl.2018.03.036 https://archimer.ifremer.fr/doc/00495/60703/ info:eu-repo/semantics/openAccess restricted use Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2018-06 , Vol. 491 , P. 48-57 oceanic deoxygenation redox sensitive elements ventilation Antarctic Intermediate Water New Zealand circulation changes text Publication info:eu-repo/semantics/article 2018 ftarchimer https://doi.org/10.1016/j.epsl.2018.03.036 2021-09-23T20:32:41Z 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 delta C-13, 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 Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) 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 |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
oceanic deoxygenation redox sensitive elements ventilation Antarctic Intermediate Water New Zealand circulation changes |
spellingShingle |
oceanic deoxygenation redox sensitive elements ventilation Antarctic Intermediate Water New Zealand circulation changes Durand, Axel Chase, Zanna Noble, Taryn L. Bostock, Helen Jaccard, Samuel L. Townsend, Ashley T. Bindoff, Nathaniel L. Neil, Helen Jacobsen, Geraldine Reduced oxygenation at intermediate depths of the southwest Pacific during the last glacial maximum |
topic_facet |
oceanic deoxygenation redox sensitive elements ventilation Antarctic Intermediate Water New Zealand circulation changes |
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 delta C-13, 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 L. Bostock, Helen Jaccard, Samuel L. Townsend, Ashley T. Bindoff, Nathaniel L. Neil, Helen Jacobsen, Geraldine |
author_facet |
Durand, Axel Chase, Zanna Noble, Taryn L. Bostock, Helen Jaccard, Samuel L. Townsend, Ashley T. Bindoff, Nathaniel L. 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 Science Bv |
publishDate |
2018 |
url |
https://archimer.ifremer.fr/doc/00495/60703/83612.pdf https://doi.org/10.1016/j.epsl.2018.03.036 https://archimer.ifremer.fr/doc/00495/60703/ |
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 |
Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2018-06 , Vol. 491 , P. 48-57 |
op_relation |
https://archimer.ifremer.fr/doc/00495/60703/83612.pdf doi:10.1016/j.epsl.2018.03.036 https://archimer.ifremer.fr/doc/00495/60703/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
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_ |
1766247506199445504 |