Changes in western Mediterranean thermohaline circulation in association with a deglacial Organic Rich Layer formation in the Alboran Sea

Pérez-Asensio, José N.; Frigola, Jaime; Pena, Leopoldo D.; Sierro, Francisco J.; Reguera, María Isabel; Rodrı́guez-Tovar, Francisco J.; Dorador, Javier; Asioli, Alessandra; Kuhlmann, Jannis; Huhn, Katrin; Cacho, Isabel

doi:10.1016/j.quascirev.2019.106075

Cited by 41 publications

(23 citation statements)

References 94 publications

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“…Considering this last fact, YD precipitation would have been mainly affected by an even more depleted Atlantic precipitation source resulting from the ice-sheet meltwater release in the North Atlantic Ocean. Similar paleohydrological YD trends (dry climate and isotopically-depleted precipitation) have been observed in central and western Europe (Rach et al, 2014;Renssen et al, 2018).…”

Section: Potential Drivers Of Millennial-scale Paleohydrological Changessupporting

confidence: 75%

Paleohydrological dynamics in the Western Mediterranean during the last glacial cycle

García‐Alix

Camuera

Ramos‐Román

et al. 2021

Global and Planetary Change

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Section: Potential Drivers Of Millennial-scale Paleohydrological Changessupporting

confidence: 75%

Paleohydrological dynamics in the Western Mediterranean during the last glacial cycle

García‐Alix

Camuera

Ramos‐Román

et al. 2021

Global and Planetary Change

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“…Enhanced TOC contents were registered in time periods corresponding to the D/O interstadials 7, 6, 5, at the end of H3, H2, and LGM, and from the beginning of H1 and YD to ca. 9 kyr, which corresponds to the time period of the Organic Rich Layer 1 (ORL1) deposition in the Alboran Sea (Cacho et al., 2002; Pérez‐Asensio et al., 2020; Rodrigo‐Gámiz et al., 2011).…”

Section: Resultsmentioning

confidence: 99%

“…High alkenone ARs are recorded during D/O interstadials 7, 5, and during the B‐A period (Figure 4b). High concentrations of C 37 alkenones in sediments deposited during the B‐A period and early Holocene have previously been related to progressively humid conditions and concomitant nutrient input by a fluvial discharge that also led to a stratified upper water column (e.g., Ausín et al., 2015; Cacho et al., 2002; Pérez‐Asensio et al., 2020; Rodrigo‐Gámiz et al., 2011), explaining the high content and good preservation of OM that characterizes the ORL1 deposition in the western Mediterranean. Proboscia diatoms are the predominant source of C 28‐30 1,14‐diols and these biomarkers have been shown to be useful indicators of Proboscia productivity increases in upwelling areas (Rampen et al., 2007; Sinninghe Damsté et al., 2003).…”

Section: Discussionmentioning

confidence: 99%

“…In particular, the westernmost Mediterranean (Alboran Sea) is an exceptional location since high sedimentation rates have provided excellent records for reconstructing past climate variability at high‐resolution. Studies were based on geochemical proxies (e.g., Cacho et al., 1999, 2001, 2002; Martrat et al., 2004, 2014; Moreno et al., 2005; Rodrigo‐Gámiz et al., 2011, 2014), on pollen records (e.g., Combourieu Nebout et al., 2009; Fletcher & Sánchez Goñi, 2008), or were focused on variations in the abundance of specific microfossil assemblages (e.g., Ausín et al., 2015; Bazzicalupo et al., 2018; Incarbona et al., 2013; Pérez‐Asensio et al., 2020). Sea surface temperature (SST) is a parameter that is highly sensitive to climate variability and past abrupt climate changes.…”

Section: Introductionmentioning

confidence: 99%

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Rapid Climate Changes in the Westernmost Mediterranean (Alboran Sea) Over the Last 35 kyr: New Insights From Four Lipid Paleothermometers (U^K'₃₇, TEX^H₈₆, RI‐OH', and LDI)

Morcillo-Montalbá

Rodrigo-Gámiz

Martı́nez-Ruiz

et al. 2021

Paleoceanog and Paleoclimatol

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The westernmost Mediterranean is one of the most sensitive areas to global climate change and high sedimentation rates allow recording high frequency variability. We present a high‐resolution paleotemperature reconstruction over the last 35 kyr using, for the first time, four independent organic sea surface temperature (SST) proxies (UK'37, TEXH86, RI‐OH' and LDI) based on alkenones, (hydroxy) isoprenoid GDGTs, and long‐chain diols. We also generated a δ18O of planktonic foraminifera G. bulloides record together with records of bulk parameters (total organic carbon content, δ13Corg) and the accumulation rates of different biomarkers to provide insights into terrestrial input and primary producers. All derived‐SST records showed similar trends over the last 35 kyr, revealing abrupt temperature variations during the last seven Dansgaard‐Oeschger (D/O) cycles, the three Heinrich (H) events, the Last Glacial Maximum, and the Younger Dryas. H3 is recognized as the coldest event, while H1 was recorded by all SST proxies as the most abrupt one. In general, TEXH86‐, RI‐OH'‐ and LDI‐SST estimates were lower than those obtained from UK'37. The LDI paleothermometer recorded the largest range of absolute SSTs over the whole period (ca. 20°C) followed by RI‐OH' (ca. 16°C). TEXH86, RI‐OH' and LDI proxies reflected sudden SST changes during the D/O 6 and 5 particularly well. Low BIT values and the abundance of C32 1,15‐diol in range with typical marine values indicated only minor input of continental organic matter. Accumulation rates of different lipid biomarkers were generally modulated by D/O cycles, suggesting enhanced productivity during D/O interstadials and the Bölling‐Alleröd period.

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“…2007; Pérez‐Asensio et al . 2012a, 2020; Corbí 2017). The validity of the equations was evaluated by testing the bathymetric estimates against the three benthic foraminiferal bathymetric ranges (Fig.…”

Section: Methodsmentioning

confidence: 99%

Quantitative palaeobathymetric reconstructions based on foraminiferal proxies: a case study from the Neogene of south‐west Spain

Pérez-Asensio

2021

Palaeontology

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Quantitative palaeobathymetric reconstructions based on foraminiferal proxies have been used in a wide variety of geological studies on tectonic, climatic and environmental changes in sedimentary basins. However, palaeo‐water‐depth estimates are frequently biased due to taphonomic processes (dissolution, transport) as well as local conditions (primary productivity, oxygen content, and organic matter fluxes). This study evaluated the level of reliability of three commonly used transfer equations based on planktic and benthic foraminiferal proxies that produce different palaeobathymetric results, using Neogene sediments from the Guadalquivir Basin, south‐west Spain. The most trustworthy method involves removing abundant infaunal benthic foraminifera before applying the palaeo‐water‐depth equation based on benthic foraminiferal water‐depth ranges and presence/absence of species. This new approach provides sound palaeobathymetric results that improve estimations of long and short‐term relative sea‐level changes with negligible influence of taphonomic as well as ecological factors. When using one equation based on planktic/benthic ratios (P/B ratios), removing all infaunal benthic foraminiferal species improves the accuracy of P/B ratios, which yields more accurate palaeodepth reconstructions despite the low level of trustworthiness of this equation for both long and short‐term relative sea‐level variations.

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Changes in western Mediterranean thermohaline circulation in association with a deglacial Organic Rich Layer formation in the Alboran Sea

Cited by 41 publications

References 94 publications

Paleohydrological dynamics in the Western Mediterranean during the last glacial cycle

Paleohydrological dynamics in the Western Mediterranean during the last glacial cycle

Rapid Climate Changes in the Westernmost Mediterranean (Alboran Sea) Over the Last 35 kyr: New Insights From Four Lipid Paleothermometers (U^K'₃₇, TEX^H₈₆, RI‐OH', and LDI)

Quantitative palaeobathymetric reconstructions based on foraminiferal proxies: a case study from the Neogene of south‐west Spain

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Changes in western Mediterranean thermohaline circulation in association with a deglacial Organic Rich Layer formation in the Alboran Sea

Cited by 41 publications

References 94 publications

Paleohydrological dynamics in the Western Mediterranean during the last glacial cycle

Paleohydrological dynamics in the Western Mediterranean during the last glacial cycle

Rapid Climate Changes in the Westernmost Mediterranean (Alboran Sea) Over the Last 35 kyr: New Insights From Four Lipid Paleothermometers (UK'37, TEXH86, RI‐OH', and LDI)

Quantitative palaeobathymetric reconstructions based on foraminiferal proxies: a case study from the Neogene of south‐west Spain

Contact Info

Product

Resources

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Rapid Climate Changes in the Westernmost Mediterranean (Alboran Sea) Over the Last 35 kyr: New Insights From Four Lipid Paleothermometers (U^K'₃₇, TEX^H₈₆, RI‐OH', and LDI)