Sea surface temperature reconstructions over the last 70 kyr off Portugal: Biomarker data and regional modeling

Darfeuil, Sophie; Ménot, Guillemette; Giraud, Xavier; Rostek, Frauke; Tachikawa, Kazuyo; Garcia, Marta; Bard, Édouard

doi:10.1002/2015pa002831

Cited by 28 publications

(101 citation statements)

References 185 publications

(328 reference statements)

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“…In addition, alkenones and GDGTs are not analyzed in the same lipid extracts from MD99‐2348/PRGL1‐4 sediments. For example, using a single set of lipid extracts from the same depths of a sediment core from the Iberian Margin, Darfeuil et al () have reported an r coefficient of 0.89 ( n = 400, p < 0.001) between TEX 86 and U K′ 37 .…”

Section: Resultsmentioning

confidence: 99%

“…In addition, alkenones and GDGTs are not analyzed in the same lipid extracts from MD99-2348/PRGL1-4 sediments. For example, using a single set of lipid extracts from the same depths of a sediment core from the Iberian Margin, Darfeuil et al (2016) have reported an r coefficient of 0.89 (n = 400, p < 0.001) between TEX 86 and U K′ 37 . An observation that is not reliant upon the resampling of previously published records is the systematic and coherent response of RI-OH to well-known climatic events.…”

Section: Resultsmentioning

confidence: 99%

“…RI-OH (ring index of hydroxylated tetrathers; Lü et al, 2015), TEX 86 (TetraEther indeX of tetraethers consisting of 86 carbon atoms; Schouten et al, 2002), and U K′ 37 (C 37 ketone unsaturation ratio; Prahl & Wakeham, 1987) are three independent organic paleothermometers. The spatially varying BAYSPAR calibration (Tierney & Tingley, 2014 gives the same TEX 86 -based anomaly as the regional paleocalibration by Darfeuil et al (2016) at the MD95-2042 site. With the exception of the MD04-2797CQ site, little or no change in U K′ 37 -based anomalies is expected when using the BAYSPLINE calibration by Tierney and Tingley (2018) rather than the calibrations used by the authors of selected U K′ 37 -based SST records.…”

Section: Paleoceanography and Paleoclimatologymentioning

confidence: 94%

“…Microfossil-based anomalies do not all correspond to annual SST (see Table 1 and supporting information Data Set S2 for further information). All the observed SST anomalies are directly based on the following publications: MD99-2348 and PRGL1-4 (Cortina et al, 2015; this study), MD99-2346 (Boussetta et al, 2012;Melki et al, 2009), MD03-2697(Sánchez Goñi et al, 2008, MD95-2040 (de Abreu et al, 2003;Pailler & Bard, 2002), MD95-2042(Cayre et al, 1999Darfeuil et al, 2016;Pailler & Bard, 2002), MD01-2444 (Martrat et al, 2007), M39/1-08-3 (M39-008; Cacho et al, 2001), ODP-976 (Jiménez-Amat & Zahn, 2015;Martrat et al, 2014), ODP-977 (Martrat et al, 2004;Pérez-Folgado et al, 2004), MD95-2043Pérez-Folgado et al, 2003), M40/4-SL87 (Emeis et al, 2003), ODP-975 (Kandiano et al, 2014), BS79-33 Sbaffi et al, 2001), BS79-38 (Cacho et al, 2001;Sbaffi et al, 2001), KET80-03 (Kallel et al, 1997), KET80-19 (Kallel et al, 1997), KET80-04 and DED87-08 (Kallel et al, 2000), and MD04-2797CQ (Essallami et al, 2007;Rouis-Zargouni et al, 2010;Sicre et al, 2013). The MD99-2348/PRGL1-4 study site is highlighted in red.…”

Section: Paleoceanography and Paleoclimatologymentioning

confidence: 99%

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Western Mediterranean Sea Paleothermometry Over the Last Glacial Cycle Based on the Novel RI‐OH Index

Davtian

Ménot

Fagault

et al. 2019

Paleoceanog and Paleoclimatol

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RI‐OH (ring index of hydroxylated tetraethers) has recently been proposed to reconstruct paleotemperatures in middle‐ to low‐latitude marginal seas. However, RI‐OH has barely been tested in marginal seas under substantial terrigenous inputs. Here we analyze tetraether lipids in two adjacent marine cores from the Gulf of Lions. We then test for the first time the RI‐OH paleothermometer from 160 to 9 ka BP in the western Mediterranean Sea. While terrigenous inputs prevent TEX86 (TetraEther indeX of tetraethers consisting of 86 carbon atoms) from behaving as a paleothermometer, RI‐OH is generally consistent with other paleothermometric proxies. RI‐OH also responds systematically and coherently to glacial‐interglacial transitions as well as to abrupt climatic events. The average difference between RI‐OH temperatures and November–May UK′37 (C37 ketone unsaturation ratio) temperatures is −2.0 °C with a standard error of 0.4 °C based on 249 RI‐OH‐UK′37 comparisons. This systematic difference suggests that hydroxylated tetraethers and alkenones record different temperatures, for instance, winter and/or subsurface temperatures for RI‐OH. Another source of bias could be linked to the available RI‐OH‐temperature calibration, which clearly needs more work at the global and regional scales, notably for semienclosed basins such as the Mediterranean Sea. Nevertheless, our RI‐OH‐based interglacial‐glacial anomalies are of 10 °C, a value within the high end of anomalies from previously published temperature records in the western Mediterranean Sea (from 3 to 13 °C). The RI‐OH‐based temperature anomalies also confirm the regional differences and seasonal contrasts in interglacial‐glacial anomalies produced by models.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Paleoceanography and Paleoclimatologymentioning

confidence: 94%

Section: Paleoceanography and Paleoclimatologymentioning

confidence: 99%

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Western Mediterranean Sea Paleothermometry Over the Last Glacial Cycle Based on the Novel RI‐OH Index

Davtian

Ménot

Fagault

et al. 2019

Paleoceanog and Paleoclimatol

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“…This resulted in colder conditions and lower SSS in Heinrich Stadial 1 (HS1) with respect to the LGM (e.g. Cayre et al, 1999;Bard et al, 2000;Martrat et al, 2007;Eynaud et al, 2009;Voelker and Abreu, 2011;Darfeuil et al, 2016). In the Younger Dryas (YD) the protrusion of northern waters to the WIM was probably limited to subarctic waters (Eynaud et al, 2009), hence the YD was a cold and low SSS event compared to the B-A and Holocene, but not as much as during HS1.…”

Section: Paleoceanographic and Paleoclimatological Changes Across Thementioning

confidence: 99%

Comparison of qualitative and quantitative dinoflagellate cyst approaches in reconstructing glacial-interglacial climate variability at West Iberian Margin IODP ‘Shackleton’ Site U1385

Datema

Sangiorgi

Vernal

et al. 2017

Marine Micropaleontology

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A B S T R A C TDinoflagellate cysts (dinocysts) are commonly used to reconstruct past environmental conditions at the sea surface, such as primary production, temperature and salinity. Abundances of selected dinocyst taxa are used in qualitative indices, whereas the modern analogue technique (MAT) is used for quantitative reconstructions. Qualitative indices use process-based knowledge of present-day relations between the environmental variables and the distribution of dinocysts, whereas the MAT is based on the assumption that past assemblages have modern counterparts that correspond to similar sea-surface conditions. Here we explore the potential of both approaches to reconstruct sea surface temperature (SST), production (SSP), salinity (SSS) and seasonality during the last 22 thousand years along the West Iberian Margin (WIM), at Integrated Ocean Drilling Program (IODP) Site U1385. We compare results to published paleoclimatic reconstructions. Our SST and SSS reconstructions provide the first continuous dinocyst MAT-based SST and SSS records for this area and time interval.Qualitative and quantitative dinocyst-based SST estimates from the WIM are similar and resemble previous SST estimates from dinocysts, alkenones and foraminifers from nearby sites. The surface temperature trends and millennial-scale variations largely match those from the Greenland ice core records. Quantitative MAT-based SST estimates show increased seasonality in the glacial stage resulting from strong winter cooling. Dinocyst MAT-based salinity decreases concomitantly with cooling during the Younger Dryas and Heinrich Stadial 1 (HS1), likely related to the melting of icebergs that reached the region during HS1. Our qualitative and quantitative SSP estimates show higher values in the glacial stage compared to the Holocene, which is consistent with published records and supports the usefulness of both approaches. Small differences between SST tracer records may be explained by the limited number of modern analogues from warm ocean regions in the dinocyst reference dataset for MAT, the small number of dinocysts used in the qualitative estimates, the possible effect of a parameter other than temperature that might amplify noise, and/or seasonal biases of the tracer species.In any case, the advantage of the qualitative approach is to allow reconstructions in non-analogue situations. Regression of the qualitative index versus present-day SST also allows for a quantitative reconstruction, although over a limited range of SSTs (especially towards the lower end) and with quite some uncertainty, but produces reasonable values beyond the upper limit of the MAT. The MAT reconstructs more reliable SSTs, with a much smaller error of prediction, but only up to present-day WIM values, because it is based on the assumption that past assemblages have modern counterparts that correspond to similar sea-surface conditions, which is not always valid. The advantages of the MAT approach include its quantitative nature and insights into seasonality. Hence both app...

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The late Quaternary palynological record of the northern Yangtze Delta: Implication for palaeoclimate change in East Asia

Ye,

Gao,

Han

et al. 2024

CATENA

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Sea surface temperature reconstructions over the last 70 kyr off Portugal: Biomarker data and regional modeling

Cited by 28 publications

References 185 publications

Western Mediterranean Sea Paleothermometry Over the Last Glacial Cycle Based on the Novel RI‐OH Index

Western Mediterranean Sea Paleothermometry Over the Last Glacial Cycle Based on the Novel RI‐OH Index

Comparison of qualitative and quantitative dinoflagellate cyst approaches in reconstructing glacial-interglacial climate variability at West Iberian Margin IODP ‘Shackleton’ Site U1385

The late Quaternary palynological record of the northern Yangtze Delta: Implication for palaeoclimate change in East Asia

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