Reduced admixture of North Atlantic Deep Water to the deep central South Pacific during the last two glacial periods
The South Pacific is a sensitive location for the variability of the global oceanic thermohaline circulation given that deep waters from the Atlantic Ocean, the Southern Ocean, and the Pacific Basin are exchanged. Here we reconstruct the deep water circulation of the central South Pacific for the la...
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ftawi:oai:epic.awi.de:41091 2024-09-15T18:20:41+00:00 Reduced admixture of North Atlantic Deep Water to the deep central South Pacific during the last two glacial periods Molina-Kescher, Mario Frank, Martin Tapia, Raul Ronge, Thomas A. Nürnberg, Dirk Tiedemann, Ralf 2016-05-23 https://epic.awi.de/id/eprint/41091/ https://hdl.handle.net/10013/epic.48064 unknown Wiley Molina-Kescher, M. , Frank, M. , Tapia, R. , Ronge, T. A. orcid:0000-0003-2625-719X , Nürnberg, D. and Tiedemann, R. orcid:0000-0001-7211-8049 (2016) Reduced admixture of North Atlantic Deep Water to the deep central South Pacific during the last two glacial periods , Paleoceanography, 31 , pp. 1-18 . doi:10.1002/2015PA002863 <https://doi.org/10.1002/2015PA002863> , hdl:10013/epic.48064 EPIC3Paleoceanography, Wiley, 31, pp. 1-18, ISSN: 0883-8305 Article isiRev 2016 ftawi https://doi.org/10.1002/2015PA002863 2024-06-24T04:14:20Z The South Pacific is a sensitive location for the variability of the global oceanic thermohaline circulation given that deep waters from the Atlantic Ocean, the Southern Ocean, and the Pacific Basin are exchanged. Here we reconstruct the deep water circulation of the central South Pacific for the last two glacial cycles (from 240,000 years ago to the Holocene) based on radiogenic neodymium (Nd) and lead (Pb) isotope records complemented by benthic stable carbon data obtained from two sediment cores located on the flanks of the East Pacific Rise. The records show small but consistent glacial/interglacial changes in all three isotopic systems with interglacial average values of 5.8 and 18.757 for εNd and 206Pb/204Pb, respectively, whereas glacial averages are 5.3 and 18.744. Comparison of this variability of Circumpolar Deep Water (CDW) to previously published records along the pathway of the global thermohaline circulation is consistent with reduced admixture of North Atlantic Deep Water to CDW during cold stages. The absolute values and amplitudes of the benthic δ13C variations are essentially indistinguishable from other records of the Southern Hemisphere and confirm that the low central South Pacific sedimentation rates did not result in a significant reduction of the amplitude of any of the measured proxies. In addition, the combined detrital Nd and strontium (87Sr/86Sr) isotope signatures imply that Australian and New Zealand dust has remained the principal contributor of lithogenic material to the central South Pacific. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Paleoceanography 31 6 651 668 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The South Pacific is a sensitive location for the variability of the global oceanic thermohaline circulation given that deep waters from the Atlantic Ocean, the Southern Ocean, and the Pacific Basin are exchanged. Here we reconstruct the deep water circulation of the central South Pacific for the last two glacial cycles (from 240,000 years ago to the Holocene) based on radiogenic neodymium (Nd) and lead (Pb) isotope records complemented by benthic stable carbon data obtained from two sediment cores located on the flanks of the East Pacific Rise. The records show small but consistent glacial/interglacial changes in all three isotopic systems with interglacial average values of 5.8 and 18.757 for εNd and 206Pb/204Pb, respectively, whereas glacial averages are 5.3 and 18.744. Comparison of this variability of Circumpolar Deep Water (CDW) to previously published records along the pathway of the global thermohaline circulation is consistent with reduced admixture of North Atlantic Deep Water to CDW during cold stages. The absolute values and amplitudes of the benthic δ13C variations are essentially indistinguishable from other records of the Southern Hemisphere and confirm that the low central South Pacific sedimentation rates did not result in a significant reduction of the amplitude of any of the measured proxies. In addition, the combined detrital Nd and strontium (87Sr/86Sr) isotope signatures imply that Australian and New Zealand dust has remained the principal contributor of lithogenic material to the central South Pacific. |
format |
Article in Journal/Newspaper |
author |
Molina-Kescher, Mario Frank, Martin Tapia, Raul Ronge, Thomas A. Nürnberg, Dirk Tiedemann, Ralf |
spellingShingle |
Molina-Kescher, Mario Frank, Martin Tapia, Raul Ronge, Thomas A. Nürnberg, Dirk Tiedemann, Ralf Reduced admixture of North Atlantic Deep Water to the deep central South Pacific during the last two glacial periods |
author_facet |
Molina-Kescher, Mario Frank, Martin Tapia, Raul Ronge, Thomas A. Nürnberg, Dirk Tiedemann, Ralf |
author_sort |
Molina-Kescher, Mario |
title |
Reduced admixture of North Atlantic Deep Water to the deep central South Pacific during the last two glacial periods |
title_short |
Reduced admixture of North Atlantic Deep Water to the deep central South Pacific during the last two glacial periods |
title_full |
Reduced admixture of North Atlantic Deep Water to the deep central South Pacific during the last two glacial periods |
title_fullStr |
Reduced admixture of North Atlantic Deep Water to the deep central South Pacific during the last two glacial periods |
title_full_unstemmed |
Reduced admixture of North Atlantic Deep Water to the deep central South Pacific during the last two glacial periods |
title_sort |
reduced admixture of north atlantic deep water to the deep central south pacific during the last two glacial periods |
publisher |
Wiley |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/41091/ https://hdl.handle.net/10013/epic.48064 |
genre |
North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
EPIC3Paleoceanography, Wiley, 31, pp. 1-18, ISSN: 0883-8305 |
op_relation |
Molina-Kescher, M. , Frank, M. , Tapia, R. , Ronge, T. A. orcid:0000-0003-2625-719X , Nürnberg, D. and Tiedemann, R. orcid:0000-0001-7211-8049 (2016) Reduced admixture of North Atlantic Deep Water to the deep central South Pacific during the last two glacial periods , Paleoceanography, 31 , pp. 1-18 . doi:10.1002/2015PA002863 <https://doi.org/10.1002/2015PA002863> , hdl:10013/epic.48064 |
op_doi |
https://doi.org/10.1002/2015PA002863 |
container_title |
Paleoceanography |
container_volume |
31 |
container_issue |
6 |
container_start_page |
651 |
op_container_end_page |
668 |
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1810459082456301568 |