Sedimentary laminations and high-frequency climatic and oceanographic variability on the Peruvian margin
The Peruvian Upwelling System (PUS) and the corresponding Oxygen Minimum Zone (OMZ) are part of the regions where the imprint of climatic variations due to El Niño Southern Oscillation (ENSO) at the interannual and multidecadal timescales is the strongest. However,only a few records of ENSO-like cli...
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Other Authors: | , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2015
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Online Access: | https://theses.hal.science/tel-01219170 https://theses.hal.science/tel-01219170/document https://theses.hal.science/tel-01219170/file/FLEURY_SOPHIE_2015.pdf |
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ftunivnantes:oai:HAL:tel-01219170v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
French |
topic |
Peruvian Upwelling System Oxygen Minimum Zone Holocene Deglaciation Sedimentary laminations XRF Diatoms Nitrogen isotopes Productivity Denitrification Rainfall Système d’upwelling péruvien Zone à oxygène minimum Holocène Déglaciation Laminations sédimentaires Diatomées Isotopes de l’azote Productivité Dénitrification Précipitations [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Peruvian Upwelling System Oxygen Minimum Zone Holocene Deglaciation Sedimentary laminations XRF Diatoms Nitrogen isotopes Productivity Denitrification Rainfall Système d’upwelling péruvien Zone à oxygène minimum Holocène Déglaciation Laminations sédimentaires Diatomées Isotopes de l’azote Productivité Dénitrification Précipitations [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Fleury, Sophie Sedimentary laminations and high-frequency climatic and oceanographic variability on the Peruvian margin |
topic_facet |
Peruvian Upwelling System Oxygen Minimum Zone Holocene Deglaciation Sedimentary laminations XRF Diatoms Nitrogen isotopes Productivity Denitrification Rainfall Système d’upwelling péruvien Zone à oxygène minimum Holocène Déglaciation Laminations sédimentaires Diatomées Isotopes de l’azote Productivité Dénitrification Précipitations [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
The Peruvian Upwelling System (PUS) and the corresponding Oxygen Minimum Zone (OMZ) are part of the regions where the imprint of climatic variations due to El Niño Southern Oscillation (ENSO) at the interannual and multidecadal timescales is the strongest. However,only a few records of ENSO-like climatic variability reach such short timescales in thisgeographical area, despite prevailing conditions favorable to the preservation of laminatedsediments. We analyzed these sedimentary archives at the scale of the lamination, using sedimentology, micropaleontology and geochemistry. The aim was to trace variations in all parameters responding to climatic changes (rainfall, productivity, denitrification, sea surfacetemperatures). This approach has provided a full record of environmental conditions in thePeruvian OMZ at multiannual and multidecadal timescales for the first time on time intervals exceeding the last millennium. We thus evidenced a strong imprint of the Walker circulation on the PUS. This impact is paced by the extratropical northern hemisphere, especially by the North Atlantic Oscillation (NAO) at the multidecadal timescale, by the thermohaline circulation at the centennial timescale and by the Siberian High at the millennial timescale. Le Système d’Upwelling Péruvien (PUS) et la Zone à Oxygène minimum (OMZ) qui y est associée font partie des régions les plus marquées par les variations climatiques de type El Niño Southern Oscillation (ENSO), tant à l’échelle interannuelle qu’à l’échelle décennale. Or, peu d’enregistrements de l’impact de l’ENSO sur cette zone géographique atteignent ces résolutions temporelles, malgré des conditions propices à la conservation de dépôts sédimentaires laminés.Nous avons analysé ces archives sédimentaires à l’échelle de la lamine et en utilisant des marqueurs sédimentologiques, micro paléontologiques et géochimiques afin de retracer les variations de tous les paramètres susceptibles de répondre aux changements climatiques(précipitations, productivité, dénitrification, ... |
author2 |
Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Université de Bordeaux Philippe Martinez Xavier Crosta |
format |
Doctoral or Postdoctoral Thesis |
author |
Fleury, Sophie |
author_facet |
Fleury, Sophie |
author_sort |
Fleury, Sophie |
title |
Sedimentary laminations and high-frequency climatic and oceanographic variability on the Peruvian margin |
title_short |
Sedimentary laminations and high-frequency climatic and oceanographic variability on the Peruvian margin |
title_full |
Sedimentary laminations and high-frequency climatic and oceanographic variability on the Peruvian margin |
title_fullStr |
Sedimentary laminations and high-frequency climatic and oceanographic variability on the Peruvian margin |
title_full_unstemmed |
Sedimentary laminations and high-frequency climatic and oceanographic variability on the Peruvian margin |
title_sort |
sedimentary laminations and high-frequency climatic and oceanographic variability on the peruvian margin |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://theses.hal.science/tel-01219170 https://theses.hal.science/tel-01219170/document https://theses.hal.science/tel-01219170/file/FLEURY_SOPHIE_2015.pdf |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
https://theses.hal.science/tel-01219170 Milieux et Changements globaux. Université de Bordeaux, 2015. Français. ⟨NNT : 2015BORD0068⟩ |
op_relation |
NNT: 2015BORD0068 tel-01219170 https://theses.hal.science/tel-01219170 https://theses.hal.science/tel-01219170/document https://theses.hal.science/tel-01219170/file/FLEURY_SOPHIE_2015.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766136294135562240 |
spelling |
ftunivnantes:oai:HAL:tel-01219170v1 2023-05-15T17:36:43+02:00 Sedimentary laminations and high-frequency climatic and oceanographic variability on the Peruvian margin Laminations sédimentaires et variabilité climatique et océanographique haute-fréquence sur la marge péruvienne Fleury, Sophie Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Université de Bordeaux Philippe Martinez Xavier Crosta 2015-06-04 https://theses.hal.science/tel-01219170 https://theses.hal.science/tel-01219170/document https://theses.hal.science/tel-01219170/file/FLEURY_SOPHIE_2015.pdf fr fre HAL CCSD NNT: 2015BORD0068 tel-01219170 https://theses.hal.science/tel-01219170 https://theses.hal.science/tel-01219170/document https://theses.hal.science/tel-01219170/file/FLEURY_SOPHIE_2015.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-01219170 Milieux et Changements globaux. Université de Bordeaux, 2015. Français. ⟨NNT : 2015BORD0068⟩ Peruvian Upwelling System Oxygen Minimum Zone Holocene Deglaciation Sedimentary laminations XRF Diatoms Nitrogen isotopes Productivity Denitrification Rainfall Système d’upwelling péruvien Zone à oxygène minimum Holocène Déglaciation Laminations sédimentaires Diatomées Isotopes de l’azote Productivité Dénitrification Précipitations [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/doctoralThesis Theses 2015 ftunivnantes 2023-03-08T07:20:55Z The Peruvian Upwelling System (PUS) and the corresponding Oxygen Minimum Zone (OMZ) are part of the regions where the imprint of climatic variations due to El Niño Southern Oscillation (ENSO) at the interannual and multidecadal timescales is the strongest. However,only a few records of ENSO-like climatic variability reach such short timescales in thisgeographical area, despite prevailing conditions favorable to the preservation of laminatedsediments. We analyzed these sedimentary archives at the scale of the lamination, using sedimentology, micropaleontology and geochemistry. The aim was to trace variations in all parameters responding to climatic changes (rainfall, productivity, denitrification, sea surfacetemperatures). This approach has provided a full record of environmental conditions in thePeruvian OMZ at multiannual and multidecadal timescales for the first time on time intervals exceeding the last millennium. We thus evidenced a strong imprint of the Walker circulation on the PUS. This impact is paced by the extratropical northern hemisphere, especially by the North Atlantic Oscillation (NAO) at the multidecadal timescale, by the thermohaline circulation at the centennial timescale and by the Siberian High at the millennial timescale. Le Système d’Upwelling Péruvien (PUS) et la Zone à Oxygène minimum (OMZ) qui y est associée font partie des régions les plus marquées par les variations climatiques de type El Niño Southern Oscillation (ENSO), tant à l’échelle interannuelle qu’à l’échelle décennale. Or, peu d’enregistrements de l’impact de l’ENSO sur cette zone géographique atteignent ces résolutions temporelles, malgré des conditions propices à la conservation de dépôts sédimentaires laminés.Nous avons analysé ces archives sédimentaires à l’échelle de la lamine et en utilisant des marqueurs sédimentologiques, micro paléontologiques et géochimiques afin de retracer les variations de tous les paramètres susceptibles de répondre aux changements climatiques(précipitations, productivité, dénitrification, ... Doctoral or Postdoctoral Thesis North Atlantic North Atlantic oscillation Université de Nantes: HAL-UNIV-NANTES |