Cited by 55Geology and Paleoclimatology ResearchMarine and environmental studiesPaleontology and Stratigraphy of Fossils

Sea surface temperature reconstructions over the last 70 kyr off Portugal: Biomarker data and regional modeling: Biomarkers and Modeling as SST Proxies

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Darfeuil, Sophie, Ménot, Guillemette, Giraud, Xavier, Rostek, Frauke, Tachikawa, Kazuyo, Garcia, Marta, Bard, Édouard·2016·Paleoceanography

Abstract

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 Uk′37 and TEX86, considering season and depth of production. To do so, high-resolution signals of Uk′37 and TEX86 are determined for the last 70 kyr for core MD95-2042, located off Portugal. Signals of Uk′37 and TEX86 present a tight correlation, demonstrating a dominant temperature effect. Uk′37 signals correspond well to the annual mean sea surface temperature (SST), whereas TEXH86-derived temperatures are 5.6°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 0–200 m) 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°C for ΔT(PD-LGM) and 3–4°C for ΔT(LGM-HS). Therefore, we propose a new TEXH86 regional calibration to reconstruct present and past annual mean SSTs on the Iberian Margin.

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  • The Iberian alkenone-SST record has been remeasured to increase its time resolution and precision, providing improved confidence in correlation tie-points.

    “The only significant difference is that the Iberian alkenone-SST record has been remeasured to increase its time resolution and precision (Darfeuil et al. 2016), providing improved confidence in the correlation tie-points.”

    From The IntCal20 Northern Hemisphere Radiocarbon Age Calibration Curve (0–55 cal kBP) (2020) · cites this paper as Darfeuil et al. 2016

    Section 3.2 (p. 5) reports new alkenone measurements from core MD95-2042 at an average time resolution of 260 years and compares the new high-resolution record with measurements made in 1998. It assesses analytical precision, but does not show that precision improved over the earlier record or discuss increased confidence in correlation tie-points. (LLM, conf=0.86)

    Experimental — accuracy not yet measured

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Research works printed but not linked: 1

  1. Antonov, J. I., R. A. Locarnini, T. P. Boyer, A. V. Mishonov, and H. E. Garcia (2006), World Ocean Atlas 2005, Volume 2: Salinity , NOAAAtlas NESDIS , vol. 62, edited by S. Levitus, U.S. Gov. Print. Off., Washington, D. C.

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Authors
Darfeuil, S., Ménot, G., Giraud, X., Rostek, F., Tachikawa, K., Garcia, M., & Bard, É.
Affiliations
  • Centre National de la Recherche Scientifique (FR)
  • École Normale Supérieure de Lyon (FR)
Corresponding author
Darfeuil, Sophie
Venue
Paleoceanography
Published
2016-01
Volume
31
Issue
1
Pages
40-65
ISSN
0883-8305 (ISSN-L)
OpenAlex
W2292513758
Cited by
55
References
187
Citations by year
2026: 3 · 2025: 3 · 2024: 3 · 2023: 9 · 2022: 4 · 2021: 15 · 2020: 7 · 2019: 4 · 2018: 5 · 2017: 1 · 2016: 1
FWCI
1.62
Type
journal article
Language
en
Open access
Locations
  • Paleoceanography (publishedVersion, other-oa)
  • HAL AMU (submittedVersion, other-oa)
  • Institutional Archive of Ifremer (French Research Institute for Exploitation of the Sea) (submittedVersion)
Funders
  • European Community
  • Collège de France
  • INSU
Topics
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and environmental studies
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
Keywords
sea surface temperature reconstruction, UK'37, TEX86, Iberian margin, North Atlantic, Last Glacial Maximum, Heinrich Stadials, Last Interglacial, archaeal communities, paleoclimate

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