Sea surface temperature reconstructions over the last 70kyr off Portugal: Biomarker data and regional modeling
International audience This study aims at providing robust temperature reconstructions for a key oceanographic setting in the North Atlantic and at understanding the nature of the temperature signal recorded by the two biomarkers U-37(k) and TEX86, considering season and depth of production. To do s...
Published in: | Paleoceanography |
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Main Authors: | , , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2016
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Online Access: | https://hal.science/hal-01463313 https://hal.science/hal-01463313/document https://hal.science/hal-01463313/file/2015PA002831.pdf https://doi.org/10.1002/2015PA002831 |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
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English |
topic |
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] |
spellingShingle |
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] Darfeuil, Sophie Menot, Guillemette Giraud, Xavier Rostek, Frauke Tachikawa, K. Garcia, Marta Bard, Edouard Sea surface temperature reconstructions over the last 70kyr off Portugal: Biomarker data and regional modeling |
topic_facet |
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] |
description |
International audience This study aims at providing robust temperature reconstructions for a key oceanographic setting in the North Atlantic and at understanding the nature of the temperature signal recorded by the two biomarkers U-37(k) and TEX86, considering season and depth of production. To do so, high-resolution signals of U-37(k) and TEX86 are determined for the last 70kyr for core MD95-2042, located off Portugal. Signals of U-37(k) and TEX86 present a tight correlation, demonstrating a dominant temperature effect. U-37(k) signals correspond well to the annual mean sea surface temperature (SST), whereas TEX86H-derived temperatures are 5.6 degrees C higher, which is unrealistically warm for this area. Unsuitable TEX86 global linear calibrations on the Iberian Margin may suggest a possible occurrence of archaeal communities with specific temperature response. To assess the impact of different season or depth of production of the biomarkers on the recorded temperature in the sediment, modeled temperature proxies (Tproxies) are introduced in a Regional Oceanic Modeling System and tested for different seasons (annual/summer/winter) and depths (surface and 0-200m) of production for three climate modes (Present Day (PD), Last Glacial Maximum (LGM), and Heinrich Stadials (HS)). Similar temperature amplitudes between climate modes are found at MD95-2042 core site for observations, for both biomarkers, and for modeled annual surface production Tproxy: 5.5-7 degrees C for T(PD-LGM) and 3-4 degrees C for T(LGM-HS). Therefore, we propose a new TEX86H regional calibration to reconstruct present and past annual mean SSTs on the Iberian Margin. |
author2 |
Collège de France - Chaire Evolution du climat et de l'océan Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Géochimie & géochrono Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Aix Marseille Université (AMU) |
format |
Article in Journal/Newspaper |
author |
Darfeuil, Sophie Menot, Guillemette Giraud, Xavier Rostek, Frauke Tachikawa, K. Garcia, Marta Bard, Edouard |
author_facet |
Darfeuil, Sophie Menot, Guillemette Giraud, Xavier Rostek, Frauke Tachikawa, K. Garcia, Marta Bard, Edouard |
author_sort |
Darfeuil, Sophie |
title |
Sea surface temperature reconstructions over the last 70kyr off Portugal: Biomarker data and regional modeling |
title_short |
Sea surface temperature reconstructions over the last 70kyr off Portugal: Biomarker data and regional modeling |
title_full |
Sea surface temperature reconstructions over the last 70kyr off Portugal: Biomarker data and regional modeling |
title_fullStr |
Sea surface temperature reconstructions over the last 70kyr off Portugal: Biomarker data and regional modeling |
title_full_unstemmed |
Sea surface temperature reconstructions over the last 70kyr off Portugal: Biomarker data and regional modeling |
title_sort |
sea surface temperature reconstructions over the last 70kyr off portugal: biomarker data and regional modeling |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-01463313 https://hal.science/hal-01463313/document https://hal.science/hal-01463313/file/2015PA002831.pdf https://doi.org/10.1002/2015PA002831 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01463313 Paleoceanography, 2016, 31 (1), pp.40-65. ⟨10.1002/2015PA002831⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2015PA002831 hal-01463313 https://hal.science/hal-01463313 https://hal.science/hal-01463313/document https://hal.science/hal-01463313/file/2015PA002831.pdf doi:10.1002/2015PA002831 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2015PA002831 |
container_title |
Paleoceanography |
container_volume |
31 |
container_issue |
1 |
container_start_page |
40 |
op_container_end_page |
65 |
_version_ |
1785570477227376640 |
spelling |
ftinsu:oai:HAL:hal-01463313v1 2023-12-17T10:46:50+01:00 Sea surface temperature reconstructions over the last 70kyr off Portugal: Biomarker data and regional modeling Darfeuil, Sophie Menot, Guillemette Giraud, Xavier Rostek, Frauke Tachikawa, K. Garcia, Marta Bard, Edouard Collège de France - Chaire Evolution du climat et de l'océan Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Géochimie & géochrono Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Aix Marseille Université (AMU) 2016-01 https://hal.science/hal-01463313 https://hal.science/hal-01463313/document https://hal.science/hal-01463313/file/2015PA002831.pdf https://doi.org/10.1002/2015PA002831 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2015PA002831 hal-01463313 https://hal.science/hal-01463313 https://hal.science/hal-01463313/document https://hal.science/hal-01463313/file/2015PA002831.pdf doi:10.1002/2015PA002831 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01463313 Paleoceanography, 2016, 31 (1), pp.40-65. ⟨10.1002/2015PA002831⟩ [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] info:eu-repo/semantics/article Journal articles 2016 ftinsu https://doi.org/10.1002/2015PA002831 2023-11-22T17:35:13Z International audience This study aims at providing robust temperature reconstructions for a key oceanographic setting in the North Atlantic and at understanding the nature of the temperature signal recorded by the two biomarkers U-37(k) and TEX86, considering season and depth of production. To do so, high-resolution signals of U-37(k) and TEX86 are determined for the last 70kyr for core MD95-2042, located off Portugal. Signals of U-37(k) and TEX86 present a tight correlation, demonstrating a dominant temperature effect. U-37(k) signals correspond well to the annual mean sea surface temperature (SST), whereas TEX86H-derived temperatures are 5.6 degrees C higher, which is unrealistically warm for this area. Unsuitable TEX86 global linear calibrations on the Iberian Margin may suggest a possible occurrence of archaeal communities with specific temperature response. To assess the impact of different season or depth of production of the biomarkers on the recorded temperature in the sediment, modeled temperature proxies (Tproxies) are introduced in a Regional Oceanic Modeling System and tested for different seasons (annual/summer/winter) and depths (surface and 0-200m) of production for three climate modes (Present Day (PD), Last Glacial Maximum (LGM), and Heinrich Stadials (HS)). Similar temperature amplitudes between climate modes are found at MD95-2042 core site for observations, for both biomarkers, and for modeled annual surface production Tproxy: 5.5-7 degrees C for T(PD-LGM) and 3-4 degrees C for T(LGM-HS). Therefore, we propose a new TEX86H regional calibration to reconstruct present and past annual mean SSTs on the Iberian Margin. Article in Journal/Newspaper North Atlantic Institut national des sciences de l'Univers: HAL-INSU Paleoceanography 31 1 40 65 |