Southern Ocean sourced waters modulate Eastern Equatorial Pacific denitrification during the Mid-Pleistocene transition
The Eastern tropical Pacific holds extensive oxygen minimum zone (OMZ) areas where pelagic denitrification occurs. Sedimentary nitrogen isotopes are believed to record their denitrification history, which provides indirect evidence for the past extent of the upper ocean oxygen depletion. We present...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Palaeogeography Palaeoclimatology Palaeoecology
2021
|
Subjects: | |
Online Access: | http://hdl.handle.net/11093/2308 https://doi.org/10.1016/j.palaeo.2021.110531 https://linkinghub.elsevier.com/retrieve/pii/S0031018221003163 |
id |
ftunivvigo:oai:investigo.biblioteca.uvigo.es:11093/2308 |
---|---|
record_format |
openpolar |
spelling |
ftunivvigo:oai:investigo.biblioteca.uvigo.es:11093/2308 2023-05-15T18:25:34+02:00 Southern Ocean sourced waters modulate Eastern Equatorial Pacific denitrification during the Mid-Pleistocene transition Diz Ferreiro, Paula Perez Arlucea, Marta Maria 2021-09-01 http://hdl.handle.net/11093/2308 https://doi.org/10.1016/j.palaeo.2021.110531 https://linkinghub.elsevier.com/retrieve/pii/S0031018221003163 eng eng Palaeogeography Palaeoclimatology Palaeoecology Xeociencias mariñas e ordenación do territorio Oceanografía Xeolóxica e Bioxeoquímica Palaeogeography Palaeoclimatology Palaeoecology, 577, 110531 (2021) 00310182 http://hdl.handle.net/11093/2308 doi:10.1016/j.palaeo.2021.110531 https://linkinghub.elsevier.com/retrieve/pii/S0031018221003163 openAccess 2510.90 Geología Marina article 2021 ftunivvigo https://doi.org/10.1016/j.palaeo.2021.110531 2022-02-28T19:37:58Z The Eastern tropical Pacific holds extensive oxygen minimum zone (OMZ) areas where pelagic denitrification occurs. Sedimentary nitrogen isotopes are believed to record their denitrification history, which provides indirect evidence for the past extent of the upper ocean oxygen depletion. We present a new high-resolution sedimentary δ15N record of ODP Site 1242 located in the Eastern Equatorial Pacific during the Mid-Pleistocene Transition. The sedimentary record shows increased (decreased) denitrification during interglacial (glacial) periods and a substantial 41 kyr power. Comparing the sedimentary nitrogen signal with proxies for organic carbon supply and paleoxygenation indicates a decoupling of the denitrification from local productivity and bottom water oxygenation. We claim that this feature is a response to the extratropical ventilation of the subthermocline waters. Increased glacial AAIW influence might have provided the EEP with oxygenated and nutrient-rich waters, explaining the decreased glacial denitrification rates observed in Site 1242 and other OMZs records. Qualitative inferences about the vertical oxygen structure depict an extensive deoxygenated glacial EEP. This scenario might have contributed to the storage of the carbon captured during the glacials of the MPT. Financiado para publicación en acceso aberto: Universidade de Vigo/CISUG Ministerio de Economía, Industria y Competitividad | Ref. CGL2016-79878-R Article in Journal/Newspaper Southern Ocean University of Vigo: Investigo (Repositorio Institucional de la Universidade de Vigo) Southern Ocean Pacific Palaeogeography, Palaeoclimatology, Palaeoecology 577 110531 |
institution |
Open Polar |
collection |
University of Vigo: Investigo (Repositorio Institucional de la Universidade de Vigo) |
op_collection_id |
ftunivvigo |
language |
English |
topic |
2510.90 Geología Marina |
spellingShingle |
2510.90 Geología Marina Diz Ferreiro, Paula Perez Arlucea, Marta Maria Southern Ocean sourced waters modulate Eastern Equatorial Pacific denitrification during the Mid-Pleistocene transition |
topic_facet |
2510.90 Geología Marina |
description |
The Eastern tropical Pacific holds extensive oxygen minimum zone (OMZ) areas where pelagic denitrification occurs. Sedimentary nitrogen isotopes are believed to record their denitrification history, which provides indirect evidence for the past extent of the upper ocean oxygen depletion. We present a new high-resolution sedimentary δ15N record of ODP Site 1242 located in the Eastern Equatorial Pacific during the Mid-Pleistocene Transition. The sedimentary record shows increased (decreased) denitrification during interglacial (glacial) periods and a substantial 41 kyr power. Comparing the sedimentary nitrogen signal with proxies for organic carbon supply and paleoxygenation indicates a decoupling of the denitrification from local productivity and bottom water oxygenation. We claim that this feature is a response to the extratropical ventilation of the subthermocline waters. Increased glacial AAIW influence might have provided the EEP with oxygenated and nutrient-rich waters, explaining the decreased glacial denitrification rates observed in Site 1242 and other OMZs records. Qualitative inferences about the vertical oxygen structure depict an extensive deoxygenated glacial EEP. This scenario might have contributed to the storage of the carbon captured during the glacials of the MPT. Financiado para publicación en acceso aberto: Universidade de Vigo/CISUG Ministerio de Economía, Industria y Competitividad | Ref. CGL2016-79878-R |
format |
Article in Journal/Newspaper |
author |
Diz Ferreiro, Paula Perez Arlucea, Marta Maria |
author_facet |
Diz Ferreiro, Paula Perez Arlucea, Marta Maria |
author_sort |
Diz Ferreiro, Paula |
title |
Southern Ocean sourced waters modulate Eastern Equatorial Pacific denitrification during the Mid-Pleistocene transition |
title_short |
Southern Ocean sourced waters modulate Eastern Equatorial Pacific denitrification during the Mid-Pleistocene transition |
title_full |
Southern Ocean sourced waters modulate Eastern Equatorial Pacific denitrification during the Mid-Pleistocene transition |
title_fullStr |
Southern Ocean sourced waters modulate Eastern Equatorial Pacific denitrification during the Mid-Pleistocene transition |
title_full_unstemmed |
Southern Ocean sourced waters modulate Eastern Equatorial Pacific denitrification during the Mid-Pleistocene transition |
title_sort |
southern ocean sourced waters modulate eastern equatorial pacific denitrification during the mid-pleistocene transition |
publisher |
Palaeogeography Palaeoclimatology Palaeoecology |
publishDate |
2021 |
url |
http://hdl.handle.net/11093/2308 https://doi.org/10.1016/j.palaeo.2021.110531 https://linkinghub.elsevier.com/retrieve/pii/S0031018221003163 |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Palaeogeography Palaeoclimatology Palaeoecology, 577, 110531 (2021) 00310182 http://hdl.handle.net/11093/2308 doi:10.1016/j.palaeo.2021.110531 https://linkinghub.elsevier.com/retrieve/pii/S0031018221003163 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1016/j.palaeo.2021.110531 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
577 |
container_start_page |
110531 |
_version_ |
1766207124395786240 |