The impact of ice-sheet dynamics in western Mediterranean environmental conditions during Terminations. An approach based on terrestrial long chain n-alkanes deposited in the upper slope of the Gulf of Lions

Cortina, Aleix; Grimalt, Joan O.; Rigual-Hernández, Andrés S.; Ballegeer, Anne-Marie; Martrat, Belén; Sierro, Francisco J.; Flores, José-Abel

doi:10.1016/j.chemgeo.2016.03.015

Cited by 12 publications

(9 citation statements)

References 71 publications

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“…During glacial times, we observe a greater CaCO 3 proportion of what is unexpected considering the low carbonate productivity observed in the western Mediterranean Sea (Hoogakker et al, 2004;Toucanne et al, 2015). Interestingly, this increase in carbonate content is concomitant with a higher detrital flux (Cortina et al, 2013(Cortina et al, , 2016Pasquier et al, 2017Pasquier et al, , 2018; as the rise around 155 ka is synchronous with an extensive melting episode of Alpine ice-caps and local glaciers (Toucanne et al, 2009;Bickel et al, 2015 and reference therein), (Figure 2). This suggests a significant increase of detrital carbonates exported during glacial conditions.…”

Section: Variation Through Time: Composition or Proportion?supporting

confidence: 51%

Quantifying Biogenic Versus Detrital Carbonates on Marine Shelf: An Isotopic Approach

et al. 2019

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Section: Variation Through Time: Composition or Proportion?supporting

confidence: 51%

Quantifying Biogenic Versus Detrital Carbonates on Marine Shelf: An Isotopic Approach

et al. 2019

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“…In addition, unrealistically high U K′ 37 -based SSTs from PRGL1-4 sediments-unpublished in the paper by Cortina et al (2015)-were reported during MIS 2 due to coelutions with alkenones (Rama-Corredor et al, 2018). These coelutions occurred because the MD99-2348/PRGL1-4 study site received substantial terrigenous inputs from the Rhône River during glacial periods (Cortina et al, 2016;Frigola et al, 2012;Pasquier et al, 2017Pasquier et al, , 2019Sierro et al, 2009). Therefore, at least some unknown portions of the alkenone-based record by Cortina et al (2015) could be affected by coelutions, especially during glacial maxima.…”

Section: Resultsmentioning

confidence: 97%

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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“…The fraction of the riverine input in coastal areas is usually much higher compared to the aeolian input. Therefore, terrestrial n-alkane concentrations have already been successfully applied to study the riverine input in coastal settings in the Mediterranean (Abrantes et al, 2017;Cortina et al, 2016;Jalali et al, 2016;Jalali et al, 2017). More specifically,…”

Section: Proxy Restrictionsmentioning

confidence: 99%

Multi-decadal climate variability in southern Iberia during the mid- to late-Holocene

Schirrmacher

Weinelt

Blanz

et al. 2018

Preprint

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Abstract. To assess the regional multi-decadal to multi-centennial climate variability at the southern Iberian Peninsula during the mid- to late- Holocene transition multi-proxy records of two marine sediment cores were established for two sites in the Alboran Sea (ODP-161-976A) and the Gulf of Cadiz (GeoB5901-2). High-resolution records of organic geochemical proxies and planktic foraminiferal assemblages are used to decipher precipitation and vegetation changes as well as the sea surface conditions with respect to Sea Surface Temperature (SST) and marine primary productivity (MPP). n-Alkane records as a proxy for precipitation changes suggest a series of six distinct drought events at 5.4 ka BP, from ca. 5.1 ka BP to 4.9 ka BP, from 4.8 to 4.7 ka BP, at 4.6 ka BP, from 4.4 to 4.3 ka BP and, from 3.8 to 3.7 ka BP. Each drought event is associated with a major vegetation change towards higher proportions of C4 vegetation. The drought events are further accompanied by annual and spring/ winter SST warming as well as decreasing MPP in the Alboran Sea. Altogether, the close correlation of the observed droughts with North Atlantic Oscillation (NAO)-like variability suggests changes in the atmospheric circulation as important driving mechanism of terrestrial and oceanic variability at southern Iberia and the Alboran Sea, respectively. Sea surface variability in the Gulf of Cadiz, instead, is intimately linked to the North Atlantic Bond Events. In particular, during Bond Events 3 and 4 a pronounced increase in seasonality is found.

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The impact of ice-sheet dynamics in western Mediterranean environmental conditions during Terminations. An approach based on terrestrial long chain n-alkanes deposited in the upper slope of the Gulf of Lions

Cited by 12 publications

References 71 publications

Quantifying Biogenic Versus Detrital Carbonates on Marine Shelf: An Isotopic Approach

Quantifying Biogenic Versus Detrital Carbonates on Marine Shelf: An Isotopic Approach

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

Multi-decadal climate variability in southern Iberia during the mid- to late-Holocene

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