Hydrological processes affecting the subtropical NE Atlantic (34-38° N) over the last 30 ka: Evidence from phyto- and zooplankton assemblages
International audience New dinocyst analyses were conducted on core MD99-2339 retrieved from the central Gulf of Cadiz. Dinocyst and foraminiferal assemblages from this core are combined with existing data off SW Portugal and NW Morocco to investigate past hydrological and primary productivity regim...
Main Authors: | , , , , , , , |
---|---|
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2011
|
Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-00589629 https://hal.archives-ouvertes.fr/hal-00589629/document https://hal.archives-ouvertes.fr/hal-00589629/file/bgdiscussion-8-2281-2011.pdf https://doi.org/10.5194/bgd-8-2281-2011 |
id |
ftccsdartic:oai:HAL:hal-00589629v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
alkenone dinoflagellate cyst Ekman transport extreme event Heinrich event Last Glacial Maximum paleoceanography phytoplankton planktonic foraminifera primary production quantitative analysis reconstruction upwelling Younger Dryas zooplankton Atlantic Ocean Gulf of Cadiz Morocco Portugal [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
spellingShingle |
alkenone dinoflagellate cyst Ekman transport extreme event Heinrich event Last Glacial Maximum paleoceanography phytoplankton planktonic foraminifera primary production quantitative analysis reconstruction upwelling Younger Dryas zooplankton Atlantic Ocean Gulf of Cadiz Morocco Portugal [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology Pénaud, Aurélie Eynaud, F. Voelker, A. Marret, F. Turon, J. L. Rossignol, L. Blamart, D. Mulder, T. Hydrological processes affecting the subtropical NE Atlantic (34-38° N) over the last 30 ka: Evidence from phyto- and zooplankton assemblages |
topic_facet |
alkenone dinoflagellate cyst Ekman transport extreme event Heinrich event Last Glacial Maximum paleoceanography phytoplankton planktonic foraminifera primary production quantitative analysis reconstruction upwelling Younger Dryas zooplankton Atlantic Ocean Gulf of Cadiz Morocco Portugal [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
description |
International audience New dinocyst analyses were conducted on core MD99-2339 retrieved from the central Gulf of Cadiz. Dinocyst and foraminiferal assemblages from this core are combined with existing data off SW Portugal and NW Morocco to investigate past hydrological and primary productivity regimes in the subtropical NE Atlantic Ocean over the last 30 ka. Our results have revealed highest upwelling intensity during Heinrich Stadial 1 (HS 1) and the Younger Dryas and weaker upwelling cells during the Last Glacial Maximum and HS 2, off the SW Iberian and NW Moroccan margins. Similar assemblages between Cadiz and Morocco and distinct species off Portugal were observed during the cold climatic extremes that punctuated the last 30 ka. This pattern has been linked to the occurrence of a hydrological structure between SW Iberia and Cadiz during the last glacial period, probably similar to the modern Azores Front. This front was probably responsible locally for heterotrophic dinocysts found in the Gulf of Cadiz during the last glacial period, even if this sector is not conductive to upwelling phenomena by Ekman transport. Regional reconstructions of paleo-sea-surface temperatures using dinocyst and foraminiferal transfer functions, as well as alkenones, are also discussed and depict coherent scenarios over the last 30 ka. However, some mismatches are observed between the different quantitative reconstructions such as during HS 1 in the Gulf of Cadiz and during the LGM at the three core locations. © 2011 Author(s). |
author2 |
Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-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) LNEG Unidade de Geologia Marinha School of Environmental Sciences University of Liverpool Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) |
format |
Article in Journal/Newspaper |
author |
Pénaud, Aurélie Eynaud, F. Voelker, A. Marret, F. Turon, J. L. Rossignol, L. Blamart, D. Mulder, T. |
author_facet |
Pénaud, Aurélie Eynaud, F. Voelker, A. Marret, F. Turon, J. L. Rossignol, L. Blamart, D. Mulder, T. |
author_sort |
Pénaud, Aurélie |
title |
Hydrological processes affecting the subtropical NE Atlantic (34-38° N) over the last 30 ka: Evidence from phyto- and zooplankton assemblages |
title_short |
Hydrological processes affecting the subtropical NE Atlantic (34-38° N) over the last 30 ka: Evidence from phyto- and zooplankton assemblages |
title_full |
Hydrological processes affecting the subtropical NE Atlantic (34-38° N) over the last 30 ka: Evidence from phyto- and zooplankton assemblages |
title_fullStr |
Hydrological processes affecting the subtropical NE Atlantic (34-38° N) over the last 30 ka: Evidence from phyto- and zooplankton assemblages |
title_full_unstemmed |
Hydrological processes affecting the subtropical NE Atlantic (34-38° N) over the last 30 ka: Evidence from phyto- and zooplankton assemblages |
title_sort |
hydrological processes affecting the subtropical ne atlantic (34-38° n) over the last 30 ka: evidence from phyto- and zooplankton assemblages |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.archives-ouvertes.fr/hal-00589629 https://hal.archives-ouvertes.fr/hal-00589629/document https://hal.archives-ouvertes.fr/hal-00589629/file/bgdiscussion-8-2281-2011.pdf https://doi.org/10.5194/bgd-8-2281-2011 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.archives-ouvertes.fr/hal-00589629 Biogeosciences Discussions, European Geosciences Union, 2011, 8 (2), pp.2281-2327. ⟨10.5194/bgd-8-2281-2011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bgd-8-2281-2011 hal-00589629 https://hal.archives-ouvertes.fr/hal-00589629 https://hal.archives-ouvertes.fr/hal-00589629/document https://hal.archives-ouvertes.fr/hal-00589629/file/bgdiscussion-8-2281-2011.pdf doi:10.5194/bgd-8-2281-2011 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bgd-8-2281-2011 |
_version_ |
1766170474111303680 |
spelling |
ftccsdartic:oai:HAL:hal-00589629v1 2023-05-15T18:01:08+02:00 Hydrological processes affecting the subtropical NE Atlantic (34-38° N) over the last 30 ka: Evidence from phyto- and zooplankton assemblages Pénaud, Aurélie Eynaud, F. Voelker, A. Marret, F. Turon, J. L. Rossignol, L. Blamart, D. Mulder, T. Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-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) LNEG Unidade de Geologia Marinha School of Environmental Sciences University of Liverpool Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) 2011 https://hal.archives-ouvertes.fr/hal-00589629 https://hal.archives-ouvertes.fr/hal-00589629/document https://hal.archives-ouvertes.fr/hal-00589629/file/bgdiscussion-8-2281-2011.pdf https://doi.org/10.5194/bgd-8-2281-2011 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bgd-8-2281-2011 hal-00589629 https://hal.archives-ouvertes.fr/hal-00589629 https://hal.archives-ouvertes.fr/hal-00589629/document https://hal.archives-ouvertes.fr/hal-00589629/file/bgdiscussion-8-2281-2011.pdf doi:10.5194/bgd-8-2281-2011 info:eu-repo/semantics/OpenAccess ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.archives-ouvertes.fr/hal-00589629 Biogeosciences Discussions, European Geosciences Union, 2011, 8 (2), pp.2281-2327. ⟨10.5194/bgd-8-2281-2011⟩ alkenone dinoflagellate cyst Ekman transport extreme event Heinrich event Last Glacial Maximum paleoceanography phytoplankton planktonic foraminifera primary production quantitative analysis reconstruction upwelling Younger Dryas zooplankton Atlantic Ocean Gulf of Cadiz Morocco Portugal [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology info:eu-repo/semantics/article Journal articles 2011 ftccsdartic https://doi.org/10.5194/bgd-8-2281-2011 2021-12-19T03:40:18Z International audience New dinocyst analyses were conducted on core MD99-2339 retrieved from the central Gulf of Cadiz. Dinocyst and foraminiferal assemblages from this core are combined with existing data off SW Portugal and NW Morocco to investigate past hydrological and primary productivity regimes in the subtropical NE Atlantic Ocean over the last 30 ka. Our results have revealed highest upwelling intensity during Heinrich Stadial 1 (HS 1) and the Younger Dryas and weaker upwelling cells during the Last Glacial Maximum and HS 2, off the SW Iberian and NW Moroccan margins. Similar assemblages between Cadiz and Morocco and distinct species off Portugal were observed during the cold climatic extremes that punctuated the last 30 ka. This pattern has been linked to the occurrence of a hydrological structure between SW Iberia and Cadiz during the last glacial period, probably similar to the modern Azores Front. This front was probably responsible locally for heterotrophic dinocysts found in the Gulf of Cadiz during the last glacial period, even if this sector is not conductive to upwelling phenomena by Ekman transport. Regional reconstructions of paleo-sea-surface temperatures using dinocyst and foraminiferal transfer functions, as well as alkenones, are also discussed and depict coherent scenarios over the last 30 ka. However, some mismatches are observed between the different quantitative reconstructions such as during HS 1 in the Gulf of Cadiz and during the LGM at the three core locations. © 2011 Author(s). Article in Journal/Newspaper Planktonic foraminifera Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |