The seawater neodymium and lead isotope record of the final stages of Central American Seaway closure
Key Points: Seawater Nd and Pb isotope records for the Pliocene Caribbean and EEP Caribbean Nd isotope composition became more UNADW-like during the Pliocene Short term changes support link between CAS closure and strength of AMOC The shoaling and final closure of the Central American Seaway (CAS) r...
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ftoceanrep:oai:oceanrep.geomar.de:24974 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Key Points: Seawater Nd and Pb isotope records for the Pliocene Caribbean and EEP Caribbean Nd isotope composition became more UNADW-like during the Pliocene Short term changes support link between CAS closure and strength of AMOC The shoaling and final closure of the Central American Seaway (CAS) resulted in a major change of the global ocean circulation and has been suggested as an essential driver for strengthening of Atlantic Meridional Overturning Circulation (AMOC). The exact timing of CAS closure is key to interpreting its importance. Here we present a reconstruction of deep and intermediate water Nd and Pb isotope compositions obtained from fossil fish teeth and the authigenic coatings of planktonic foraminifera in the eastern equatorial Pacific (ODP Site 1241) and the Caribbean (ODP Sites 998, 999 and 1000) covering the final stages of CAS closure between 5.6 and 2.2 Ma. The data for the Pacific site indicate no significant Atlantic/Caribbean influence over this entire period. The Caribbean sites show a continuous trend to less radiogenic Nd isotope compositions during the Pliocene, consistent with an enhancement of Upper North Atlantic Deep Water (UNADW) inflow and a strengthening of the AMOC. Superimposed onto this long-term trend, shorter-term changes of intermediate Caribbean Nd isotope signatures approached more UNADW-like values during intervals when published reconstructions of seawater salinity suggested complete closure of the CAS. The data imply that significant deep water exchange with the Pacific essentially stopped by 7 Ma and that shallow exchange, which still occurred at least periodically until approximately 2.5 Ma, may have been linked to the strength of the AMOC but did not have any direct effect on the intermediate and deep Caribbean Nd isotope signatures through mixing with Pacific waters. |
format |
Article in Journal/Newspaper |
author |
Osborne, Anne H. Newkirk, Derrick R. Groeneveld, Jeroen Martin, Ellen E. Tiedemann, Ralf Frank, Martin |
spellingShingle |
Osborne, Anne H. Newkirk, Derrick R. Groeneveld, Jeroen Martin, Ellen E. Tiedemann, Ralf Frank, Martin The seawater neodymium and lead isotope record of the final stages of Central American Seaway closure |
author_facet |
Osborne, Anne H. Newkirk, Derrick R. Groeneveld, Jeroen Martin, Ellen E. Tiedemann, Ralf Frank, Martin |
author_sort |
Osborne, Anne H. |
title |
The seawater neodymium and lead isotope record of the final stages of Central American Seaway closure |
title_short |
The seawater neodymium and lead isotope record of the final stages of Central American Seaway closure |
title_full |
The seawater neodymium and lead isotope record of the final stages of Central American Seaway closure |
title_fullStr |
The seawater neodymium and lead isotope record of the final stages of Central American Seaway closure |
title_full_unstemmed |
The seawater neodymium and lead isotope record of the final stages of Central American Seaway closure |
title_sort |
seawater neodymium and lead isotope record of the final stages of central american seaway closure |
publisher |
AGU (American Geophysical Union) |
publishDate |
2014 |
url |
https://oceanrep.geomar.de/id/eprint/24974/ https://oceanrep.geomar.de/id/eprint/24974/1/palo20125.pdf https://oceanrep.geomar.de/id/eprint/24974/2/README.docx https://oceanrep.geomar.de/id/eprint/24974/3/fs01.pdf https://oceanrep.geomar.de/id/eprint/24974/4/fs02.pdf https://oceanrep.geomar.de/id/eprint/24974/5/fs03.pdf https://oceanrep.geomar.de/id/eprint/24974/6/fs04.pdf https://oceanrep.geomar.de/id/eprint/24974/7/ts01.docx https://oceanrep.geomar.de/id/eprint/24974/8/ts02.docx https://oceanrep.geomar.de/id/eprint/24974/9/ts03.docx https://oceanrep.geomar.de/id/eprint/24974/10/ts04.docx https://oceanrep.geomar.de/id/eprint/24974/11/text01.docx https://oceanrep.geomar.de/id/eprint/24974/43/Osborne%20et.al.pdf https://oceanrep.geomar.de/id/eprint/24974/49/palo20125%281%29.pdf https://doi.org/10.1002/2014PA002676 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic Deep Water North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Deep Water North Atlantic Planktonic foraminifera |
op_relation |
https://oceanrep.geomar.de/id/eprint/24974/1/palo20125.pdf https://oceanrep.geomar.de/id/eprint/24974/2/README.docx https://oceanrep.geomar.de/id/eprint/24974/3/fs01.pdf https://oceanrep.geomar.de/id/eprint/24974/4/fs02.pdf https://oceanrep.geomar.de/id/eprint/24974/5/fs03.pdf https://oceanrep.geomar.de/id/eprint/24974/6/fs04.pdf https://oceanrep.geomar.de/id/eprint/24974/7/ts01.docx https://oceanrep.geomar.de/id/eprint/24974/8/ts02.docx https://oceanrep.geomar.de/id/eprint/24974/9/ts03.docx https://oceanrep.geomar.de/id/eprint/24974/10/ts04.docx https://oceanrep.geomar.de/id/eprint/24974/11/text01.docx https://oceanrep.geomar.de/id/eprint/24974/43/Osborne%20et.al.pdf https://oceanrep.geomar.de/id/eprint/24974/49/palo20125%281%29.pdf Osborne, A. H. , Newkirk, D. R., Groeneveld, J., Martin, E. E., Tiedemann, R. and Frank, M. (2014) The seawater neodymium and lead isotope record of the final stages of Central American Seaway closure. Open Access Paleoceanography, 29 (7). pp. 715-729. DOI 10.1002/2014PA002676 <https://doi.org/10.1002/2014PA002676>. doi:10.1002/2014PA002676 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2014PA002676 |
container_title |
Paleoceanography |
container_volume |
29 |
container_issue |
7 |
container_start_page |
715 |
op_container_end_page |
729 |
_version_ |
1766116878450688000 |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:24974 2023-05-15T17:25:27+02:00 The seawater neodymium and lead isotope record of the final stages of Central American Seaway closure Osborne, Anne H. Newkirk, Derrick R. Groeneveld, Jeroen Martin, Ellen E. Tiedemann, Ralf Frank, Martin 2014 text https://oceanrep.geomar.de/id/eprint/24974/ https://oceanrep.geomar.de/id/eprint/24974/1/palo20125.pdf https://oceanrep.geomar.de/id/eprint/24974/2/README.docx https://oceanrep.geomar.de/id/eprint/24974/3/fs01.pdf https://oceanrep.geomar.de/id/eprint/24974/4/fs02.pdf https://oceanrep.geomar.de/id/eprint/24974/5/fs03.pdf https://oceanrep.geomar.de/id/eprint/24974/6/fs04.pdf https://oceanrep.geomar.de/id/eprint/24974/7/ts01.docx https://oceanrep.geomar.de/id/eprint/24974/8/ts02.docx https://oceanrep.geomar.de/id/eprint/24974/9/ts03.docx https://oceanrep.geomar.de/id/eprint/24974/10/ts04.docx https://oceanrep.geomar.de/id/eprint/24974/11/text01.docx https://oceanrep.geomar.de/id/eprint/24974/43/Osborne%20et.al.pdf https://oceanrep.geomar.de/id/eprint/24974/49/palo20125%281%29.pdf https://doi.org/10.1002/2014PA002676 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/24974/1/palo20125.pdf https://oceanrep.geomar.de/id/eprint/24974/2/README.docx https://oceanrep.geomar.de/id/eprint/24974/3/fs01.pdf https://oceanrep.geomar.de/id/eprint/24974/4/fs02.pdf https://oceanrep.geomar.de/id/eprint/24974/5/fs03.pdf https://oceanrep.geomar.de/id/eprint/24974/6/fs04.pdf https://oceanrep.geomar.de/id/eprint/24974/7/ts01.docx https://oceanrep.geomar.de/id/eprint/24974/8/ts02.docx https://oceanrep.geomar.de/id/eprint/24974/9/ts03.docx https://oceanrep.geomar.de/id/eprint/24974/10/ts04.docx https://oceanrep.geomar.de/id/eprint/24974/11/text01.docx https://oceanrep.geomar.de/id/eprint/24974/43/Osborne%20et.al.pdf https://oceanrep.geomar.de/id/eprint/24974/49/palo20125%281%29.pdf Osborne, A. H. , Newkirk, D. R., Groeneveld, J., Martin, E. E., Tiedemann, R. and Frank, M. (2014) The seawater neodymium and lead isotope record of the final stages of Central American Seaway closure. Open Access Paleoceanography, 29 (7). pp. 715-729. DOI 10.1002/2014PA002676 <https://doi.org/10.1002/2014PA002676>. doi:10.1002/2014PA002676 info:eu-repo/semantics/openAccess Article PeerReviewed 2014 ftoceanrep https://doi.org/10.1002/2014PA002676 2023-04-07T15:13:38Z Key Points: Seawater Nd and Pb isotope records for the Pliocene Caribbean and EEP Caribbean Nd isotope composition became more UNADW-like during the Pliocene Short term changes support link between CAS closure and strength of AMOC The shoaling and final closure of the Central American Seaway (CAS) resulted in a major change of the global ocean circulation and has been suggested as an essential driver for strengthening of Atlantic Meridional Overturning Circulation (AMOC). The exact timing of CAS closure is key to interpreting its importance. Here we present a reconstruction of deep and intermediate water Nd and Pb isotope compositions obtained from fossil fish teeth and the authigenic coatings of planktonic foraminifera in the eastern equatorial Pacific (ODP Site 1241) and the Caribbean (ODP Sites 998, 999 and 1000) covering the final stages of CAS closure between 5.6 and 2.2 Ma. The data for the Pacific site indicate no significant Atlantic/Caribbean influence over this entire period. The Caribbean sites show a continuous trend to less radiogenic Nd isotope compositions during the Pliocene, consistent with an enhancement of Upper North Atlantic Deep Water (UNADW) inflow and a strengthening of the AMOC. Superimposed onto this long-term trend, shorter-term changes of intermediate Caribbean Nd isotope signatures approached more UNADW-like values during intervals when published reconstructions of seawater salinity suggested complete closure of the CAS. The data imply that significant deep water exchange with the Pacific essentially stopped by 7 Ma and that shallow exchange, which still occurred at least periodically until approximately 2.5 Ma, may have been linked to the strength of the AMOC but did not have any direct effect on the intermediate and deep Caribbean Nd isotope signatures through mixing with Pacific waters. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic Planktonic foraminifera OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Pacific Paleoceanography 29 7 715 729 |