Rapid changes in meridional advection of Southern Ocean intermediate waters to the tropical Pacific during the last 30 kyr
13 pages, 6 figures, 2 tables, supplementary data https://doi.org/10.1016/j.epsl.2013.02.028 The Southern Ocean is increasingly recognized as a key player in the general ocean thermohaline circulation and the global climate system during glacial-interglacial transitions. In particular, the advection...
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ftcsic:oai:digital.csic.es:10261/96269 2024-02-11T09:57:28+01:00 Rapid changes in meridional advection of Southern Ocean intermediate waters to the tropical Pacific during the last 30 kyr Pena, Leopoldo Goldstein, S.L. Hemming, S.R. Jones, K.M. Calvo, Eva María Pelejero, Carles Cacho, Isabel 2013-04 http://hdl.handle.net/10261/96269 https://doi.org/10.1016/j.epsl.2013.02.028 unknown Elsevier https://doi.org/10.1016/j.epsl.2013.02.028 doi:10.1016/j.epsl.2013.02.028 issn: 0012-821X Earth and Planetary Science Letters 368: 20-32 (2013) http://hdl.handle.net/10261/96269 none Southern Ocean Equatorial Undercurrent Eastern Equatorial Pacific Intermediate water masses Planktonic foraminifera Neodymium isotopes artículo http://purl.org/coar/resource_type/c_6501 2013 ftcsic https://doi.org/10.1016/j.epsl.2013.02.028 2024-01-16T09:58:30Z 13 pages, 6 figures, 2 tables, supplementary data https://doi.org/10.1016/j.epsl.2013.02.028 The Southern Ocean is increasingly recognized as a key player in the general ocean thermohaline circulation and the global climate system during glacial-interglacial transitions. In particular, the advection of Southern Ocean intermediate waters (SOIW), like Antarctic Intermediate Water and Sub-Antarctic Mode Water, to the Eastern Equatorial Pacific (EEP), through a so-called >oceanic tunnelling> mechanism, is an important means for rapid transfer of climatic signals (such as heat, fresh water, salt, and chemical species) from high-to-low latitudes. However, information on how intermediate water advection rates changed in the past, and particularly during deglaciations, is fragmentary. We present new results for Nd isotopes (εNd) in cleaned foraminifera shells (Neogloboquadrina dutertrei) for the last 30kyr at ODP Site 1240 in the EEP. N. dutertrei preferentially dwells in the lower thermocline, at the core of the Equatorial Undercurrent (EUC), and the εNd variability over time provides a record of the changes in the εNd of the EUC. Through mixing models we show that the EUC record is primarily controlled by changes in the volume transport of intermediate waters and not by Southern Ocean εNd changes. Southern Ocean signals in the EUC are stronger during colder intervals (Younger Dryas, last glacial maximum and Heinrich stadials 1 and 2), in agreement with tropical Atlantic intermediate water records. In addition, covariations between N. dutertrei δ13C, molecular biomarkers, and diatom productivity at Site 1240 confirm the intermediate water route as an important mechanism for the transfer of climate signals from high-to-low latitudes. Changes in the SOIW chemistry during the deglaciation are likely linked to the upwelling of 'old' deep waters in the Southern Ocean and subsequent export as intermediate waters, which are coeval with the atmospheric CO2 rise. Moreover, a comparison of multiple proxy records for the ... Article in Journal/Newspaper Antarc* Antarctic Planktonic foraminifera Southern Ocean Digital.CSIC (Spanish National Research Council) Antarctic Pacific Southern Ocean Earth and Planetary Science Letters 368 20 32 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Southern Ocean Equatorial Undercurrent Eastern Equatorial Pacific Intermediate water masses Planktonic foraminifera Neodymium isotopes |
spellingShingle |
Southern Ocean Equatorial Undercurrent Eastern Equatorial Pacific Intermediate water masses Planktonic foraminifera Neodymium isotopes Pena, Leopoldo Goldstein, S.L. Hemming, S.R. Jones, K.M. Calvo, Eva María Pelejero, Carles Cacho, Isabel Rapid changes in meridional advection of Southern Ocean intermediate waters to the tropical Pacific during the last 30 kyr |
topic_facet |
Southern Ocean Equatorial Undercurrent Eastern Equatorial Pacific Intermediate water masses Planktonic foraminifera Neodymium isotopes |
description |
13 pages, 6 figures, 2 tables, supplementary data https://doi.org/10.1016/j.epsl.2013.02.028 The Southern Ocean is increasingly recognized as a key player in the general ocean thermohaline circulation and the global climate system during glacial-interglacial transitions. In particular, the advection of Southern Ocean intermediate waters (SOIW), like Antarctic Intermediate Water and Sub-Antarctic Mode Water, to the Eastern Equatorial Pacific (EEP), through a so-called >oceanic tunnelling> mechanism, is an important means for rapid transfer of climatic signals (such as heat, fresh water, salt, and chemical species) from high-to-low latitudes. However, information on how intermediate water advection rates changed in the past, and particularly during deglaciations, is fragmentary. We present new results for Nd isotopes (εNd) in cleaned foraminifera shells (Neogloboquadrina dutertrei) for the last 30kyr at ODP Site 1240 in the EEP. N. dutertrei preferentially dwells in the lower thermocline, at the core of the Equatorial Undercurrent (EUC), and the εNd variability over time provides a record of the changes in the εNd of the EUC. Through mixing models we show that the EUC record is primarily controlled by changes in the volume transport of intermediate waters and not by Southern Ocean εNd changes. Southern Ocean signals in the EUC are stronger during colder intervals (Younger Dryas, last glacial maximum and Heinrich stadials 1 and 2), in agreement with tropical Atlantic intermediate water records. In addition, covariations between N. dutertrei δ13C, molecular biomarkers, and diatom productivity at Site 1240 confirm the intermediate water route as an important mechanism for the transfer of climate signals from high-to-low latitudes. Changes in the SOIW chemistry during the deglaciation are likely linked to the upwelling of 'old' deep waters in the Southern Ocean and subsequent export as intermediate waters, which are coeval with the atmospheric CO2 rise. Moreover, a comparison of multiple proxy records for the ... |
format |
Article in Journal/Newspaper |
author |
Pena, Leopoldo Goldstein, S.L. Hemming, S.R. Jones, K.M. Calvo, Eva María Pelejero, Carles Cacho, Isabel |
author_facet |
Pena, Leopoldo Goldstein, S.L. Hemming, S.R. Jones, K.M. Calvo, Eva María Pelejero, Carles Cacho, Isabel |
author_sort |
Pena, Leopoldo |
title |
Rapid changes in meridional advection of Southern Ocean intermediate waters to the tropical Pacific during the last 30 kyr |
title_short |
Rapid changes in meridional advection of Southern Ocean intermediate waters to the tropical Pacific during the last 30 kyr |
title_full |
Rapid changes in meridional advection of Southern Ocean intermediate waters to the tropical Pacific during the last 30 kyr |
title_fullStr |
Rapid changes in meridional advection of Southern Ocean intermediate waters to the tropical Pacific during the last 30 kyr |
title_full_unstemmed |
Rapid changes in meridional advection of Southern Ocean intermediate waters to the tropical Pacific during the last 30 kyr |
title_sort |
rapid changes in meridional advection of southern ocean intermediate waters to the tropical pacific during the last 30 kyr |
publisher |
Elsevier |
publishDate |
2013 |
url |
http://hdl.handle.net/10261/96269 https://doi.org/10.1016/j.epsl.2013.02.028 |
geographic |
Antarctic Pacific Southern Ocean |
geographic_facet |
Antarctic Pacific Southern Ocean |
genre |
Antarc* Antarctic Planktonic foraminifera Southern Ocean |
genre_facet |
Antarc* Antarctic Planktonic foraminifera Southern Ocean |
op_relation |
https://doi.org/10.1016/j.epsl.2013.02.028 doi:10.1016/j.epsl.2013.02.028 issn: 0012-821X Earth and Planetary Science Letters 368: 20-32 (2013) http://hdl.handle.net/10261/96269 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.epsl.2013.02.028 |
container_title |
Earth and Planetary Science Letters |
container_volume |
368 |
container_start_page |
20 |
op_container_end_page |
32 |
_version_ |
1790609759027593216 |