Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean
We present high-resolution bulk sedimentary δ 15N data from the southern edge of the present-day oxygen minimum zone of the eastern South Pacific. The record is interpreted as representing changes in water column nitrogen removal during the last 70,000 years. We found significant fluctuations in the...
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.science/hal-00407260 https://hal.science/hal-00407260/document https://hal.science/hal-00407260/file/2006PA001308.pdf https://doi.org/10.1029/2006PA001308 |
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ftunivantilles:oai:HAL:hal-00407260v1 2024-09-09T19:45:20+00:00 Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean de Pol-Holz, R. Ulloa, O. Lamy, F. Dezileau, Laurent Sabatier, Pierre Hebbeln, D. Departamento de Oceanografía Concepción Universidad de Concepción = University of Concepción Chile (UdeC) German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ) Géosciences Montpellier Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) Fachbereich Geowissenschaften Bremen Universität Bremen 2007 https://hal.science/hal-00407260 https://hal.science/hal-00407260/document https://hal.science/hal-00407260/file/2006PA001308.pdf https://doi.org/10.1029/2006PA001308 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2006PA001308 hal-00407260 https://hal.science/hal-00407260 https://hal.science/hal-00407260/document https://hal.science/hal-00407260/file/2006PA001308.pdf doi:10.1029/2006PA001308 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.science/hal-00407260 Paleoceanography, 2007, 22 (2), pp.PA2207. ⟨10.1029/2006PA001308⟩ eastern-south Pacific denitrification ate quaternary [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2007 ftunivantilles https://doi.org/10.1029/2006PA001308 2024-06-17T23:52:23Z We present high-resolution bulk sedimentary δ 15N data from the southern edge of the present-day oxygen minimum zone of the eastern South Pacific. The record is interpreted as representing changes in water column nitrogen removal during the last 70,000 years. We found significant fluctuations in the isotopic signal that suggest major reorganizations of the oxygen minimum zone at millennial timescales. These fluctuations were not related to other millennial-scale changes like the Northern Hemisphere's Dansgaard-Oeschger climate swings or local changes in primary productivity, so appear to be dictated by the Southern Hemisphere's climate rhythm. This is preliminarily corroborated by an overall agreement between our δ 15N data and the sedimentary proxy of ice sheet dynamics in Patagonia, which is in turn correlated with surface water properties at the midlatitude subduction region of the eastern South Pacific intermediate waters. Finally, potential implications on late Quaternary changes in atmospheric CO2 concentrations are discussed. Article in Journal/Newspaper Ice Sheet Université des Antilles (UAG): HAL Pacific Patagonia Paleoceanography 22 2 |
institution |
Open Polar |
collection |
Université des Antilles (UAG): HAL |
op_collection_id |
ftunivantilles |
language |
English |
topic |
eastern-south Pacific denitrification ate quaternary [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
eastern-south Pacific denitrification ate quaternary [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography de Pol-Holz, R. Ulloa, O. Lamy, F. Dezileau, Laurent Sabatier, Pierre Hebbeln, D. Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean |
topic_facet |
eastern-south Pacific denitrification ate quaternary [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
We present high-resolution bulk sedimentary δ 15N data from the southern edge of the present-day oxygen minimum zone of the eastern South Pacific. The record is interpreted as representing changes in water column nitrogen removal during the last 70,000 years. We found significant fluctuations in the isotopic signal that suggest major reorganizations of the oxygen minimum zone at millennial timescales. These fluctuations were not related to other millennial-scale changes like the Northern Hemisphere's Dansgaard-Oeschger climate swings or local changes in primary productivity, so appear to be dictated by the Southern Hemisphere's climate rhythm. This is preliminarily corroborated by an overall agreement between our δ 15N data and the sedimentary proxy of ice sheet dynamics in Patagonia, which is in turn correlated with surface water properties at the midlatitude subduction region of the eastern South Pacific intermediate waters. Finally, potential implications on late Quaternary changes in atmospheric CO2 concentrations are discussed. |
author2 |
Departamento de Oceanografía Concepción Universidad de Concepción = University of Concepción Chile (UdeC) German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ) Géosciences Montpellier Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) Fachbereich Geowissenschaften Bremen Universität Bremen |
format |
Article in Journal/Newspaper |
author |
de Pol-Holz, R. Ulloa, O. Lamy, F. Dezileau, Laurent Sabatier, Pierre Hebbeln, D. |
author_facet |
de Pol-Holz, R. Ulloa, O. Lamy, F. Dezileau, Laurent Sabatier, Pierre Hebbeln, D. |
author_sort |
de Pol-Holz, R. |
title |
Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean |
title_short |
Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean |
title_full |
Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean |
title_fullStr |
Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean |
title_full_unstemmed |
Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean |
title_sort |
late quaternary variability of sedimentary nitrogen isotopes in the eastern south pacific ocean |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00407260 https://hal.science/hal-00407260/document https://hal.science/hal-00407260/file/2006PA001308.pdf https://doi.org/10.1029/2006PA001308 |
geographic |
Pacific Patagonia |
geographic_facet |
Pacific Patagonia |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.science/hal-00407260 Paleoceanography, 2007, 22 (2), pp.PA2207. ⟨10.1029/2006PA001308⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2006PA001308 hal-00407260 https://hal.science/hal-00407260 https://hal.science/hal-00407260/document https://hal.science/hal-00407260/file/2006PA001308.pdf doi:10.1029/2006PA001308 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2006PA001308 |
container_title |
Paleoceanography |
container_volume |
22 |
container_issue |
2 |
_version_ |
1809914950655672320 |