The evolution of deep water mixing and weathering inputs in the central Atlantic Ocean over the past 33 Myr
The isotopic composition of Nd in present-day deep waters of the central and northeastern Atlantic Ocean is thought to fingerprint mixing of North Atlantic Deep Water with Antarctic Bottom Water. The central Atlantic Romanche and Vema Fracture Zones are considered the most important pathways for dee...
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AGU (American Geophysical Union)
2003
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ftoceanrep:oai:oceanrep.geomar.de:2104 2024-09-30T14:25:46+00:00 The evolution of deep water mixing and weathering inputs in the central Atlantic Ocean over the past 33 Myr Frank, Martin van de Flierdt, T. Halliday, A. N. Kubik, P. W. Hattendorf, B. Günther, D. 2003 text https://oceanrep.geomar.de/id/eprint/2104/ https://oceanrep.geomar.de/id/eprint/2104/1/palo1076.pdf https://doi.org/10.1029/2003PA000919 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/2104/1/palo1076.pdf Frank, M. , van de Flierdt, T., Halliday, A. N., Kubik, P. W., Hattendorf, B. and Günther, D. (2003) The evolution of deep water mixing and weathering inputs in the central Atlantic Ocean over the past 33 Myr. Paleoceanography, 18 (4). p. 1091. DOI 10.1029/2003PA000919 <https://doi.org/10.1029/2003PA000919>. doi:10.1029/2003PA000919 info:eu-repo/semantics/embargoedAccess Article PeerReviewed 2003 ftoceanrep https://doi.org/10.1029/2003PA000919 2024-09-04T05:04:40Z The isotopic composition of Nd in present-day deep waters of the central and northeastern Atlantic Ocean is thought to fingerprint mixing of North Atlantic Deep Water with Antarctic Bottom Water. The central Atlantic Romanche and Vema Fracture Zones are considered the most important pathways for deep water exchange between the western and eastern Atlantic basins today. We present new Nd isotope records of the deepwater evolution in the fracture zones obtained from ferromanganese crusts, which are inconsistent with simple water mass mixing alone prior to 3 Ma and require additional inputs from other sources. The new Pb isotope time series from the fracture zones are inexplicable by simple mixing of North Atlantic Deep Water and Antarctic Bottom Water for the entire past 33 Myr. The distinct and relatively invariable Nd and Pb isotope records of deep waters in the fracture zones appear instead to have been controlled to a large extent by contributions from Saharan dust and the Orinoco/Amazon Rivers. Thus the previously observed similarity of Nd and Pb isotope time series from the western and eastern North Atlantic basins is better explainable by direct supply of Labrador Seawater to the eastern basin via a northern pathway rather than by advection of North Atlantic Deep Water via the Romanche and Vema Fracture Zones. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Paleoceanography 18 4 n/a n/a |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The isotopic composition of Nd in present-day deep waters of the central and northeastern Atlantic Ocean is thought to fingerprint mixing of North Atlantic Deep Water with Antarctic Bottom Water. The central Atlantic Romanche and Vema Fracture Zones are considered the most important pathways for deep water exchange between the western and eastern Atlantic basins today. We present new Nd isotope records of the deepwater evolution in the fracture zones obtained from ferromanganese crusts, which are inconsistent with simple water mass mixing alone prior to 3 Ma and require additional inputs from other sources. The new Pb isotope time series from the fracture zones are inexplicable by simple mixing of North Atlantic Deep Water and Antarctic Bottom Water for the entire past 33 Myr. The distinct and relatively invariable Nd and Pb isotope records of deep waters in the fracture zones appear instead to have been controlled to a large extent by contributions from Saharan dust and the Orinoco/Amazon Rivers. Thus the previously observed similarity of Nd and Pb isotope time series from the western and eastern North Atlantic basins is better explainable by direct supply of Labrador Seawater to the eastern basin via a northern pathway rather than by advection of North Atlantic Deep Water via the Romanche and Vema Fracture Zones. |
format |
Article in Journal/Newspaper |
author |
Frank, Martin van de Flierdt, T. Halliday, A. N. Kubik, P. W. Hattendorf, B. Günther, D. |
spellingShingle |
Frank, Martin van de Flierdt, T. Halliday, A. N. Kubik, P. W. Hattendorf, B. Günther, D. The evolution of deep water mixing and weathering inputs in the central Atlantic Ocean over the past 33 Myr |
author_facet |
Frank, Martin van de Flierdt, T. Halliday, A. N. Kubik, P. W. Hattendorf, B. Günther, D. |
author_sort |
Frank, Martin |
title |
The evolution of deep water mixing and weathering inputs in the central Atlantic Ocean over the past 33 Myr |
title_short |
The evolution of deep water mixing and weathering inputs in the central Atlantic Ocean over the past 33 Myr |
title_full |
The evolution of deep water mixing and weathering inputs in the central Atlantic Ocean over the past 33 Myr |
title_fullStr |
The evolution of deep water mixing and weathering inputs in the central Atlantic Ocean over the past 33 Myr |
title_full_unstemmed |
The evolution of deep water mixing and weathering inputs in the central Atlantic Ocean over the past 33 Myr |
title_sort |
evolution of deep water mixing and weathering inputs in the central atlantic ocean over the past 33 myr |
publisher |
AGU (American Geophysical Union) |
publishDate |
2003 |
url |
https://oceanrep.geomar.de/id/eprint/2104/ https://oceanrep.geomar.de/id/eprint/2104/1/palo1076.pdf https://doi.org/10.1029/2003PA000919 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/2104/1/palo1076.pdf Frank, M. , van de Flierdt, T., Halliday, A. N., Kubik, P. W., Hattendorf, B. and Günther, D. (2003) The evolution of deep water mixing and weathering inputs in the central Atlantic Ocean over the past 33 Myr. Paleoceanography, 18 (4). p. 1091. DOI 10.1029/2003PA000919 <https://doi.org/10.1029/2003PA000919>. doi:10.1029/2003PA000919 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.1029/2003PA000919 |
container_title |
Paleoceanography |
container_volume |
18 |
container_issue |
4 |
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n/a |
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n/a |
_version_ |
1811646431299108864 |