Mediterranean coccolith ecobiostratigraphy since the penultimate Glacial (the last 145,000years) and ecobioevent traceability

Stefano, Agata Di; Foresi, Luca Maria; Incarbona, Alessandro; Sprovieri, Mario; Vallefuoco, Mattia; Iorio, Marina; Pelosi, Nicola; Stefano, Enrico Di; Sangiorgi, Patrizia; Budillon, Francesca

doi:10.1016/j.marmicro.2014.12.002

Cited by 20 publications

(16 citation statements)

References 98 publications

(200 reference statements)

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“…They show a large decrease within the Sapropel S1 layer. Most of the holococcolith specimens belong to S. pulchra HOL oblonga ( Calyptrosphaera oblonga ), as already observed in late Quaternary Mediterranean sediments (Crudeli et al, ; Di Stefano et al, ; Incarbona & Di Stefano, ). All the other taxa are largely subordinate; they account for less than 5% and do not show significant abundance fluctuations, such as for S. pulchra in all three cores and for Umbellosphaera spp., Rhabdosphaera spp., and S. histrica in Core 563 (Figure ).…”

Section: Resultsmentioning

confidence: 53%

Reventilation Episodes During the Sapropel S1 Deposition in the Eastern Mediterranean Based on Holococcolith Preservation

Incarbona

Abu-Zied

Rohling

et al. 2019

Paleoceanog and Paleoclimatol

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Organic‐rich layers (sapropels), preserved in eastern Mediterranean marine sediment records, represent pronounced perturbations to thermohaline circulation and environmental conditions in the basin, in response to enhanced African monsoon activity and subsequent massive freshwater discharge. During the most recent event, Sapropel S1 formed between 10.8 and 6.1 ka, when freshwater‐driven stratification caused seafloor anoxia below ~1,800‐m depth, as a result of both failure of deep water formation and enhanced productivity. Here we analyze coccolith assemblages from the open eastern Mediterranean that form a west‐east transect across the basin and provide insights on past environmental changes. We focus on holococcoliths, which are specifically produced by coccolithophores as part of their life cycle during the haploid phase. Since holococcolith calcification is characterized by nanocrystals highly susceptible to dissolution, we are testing their potential preservation under different bottom environmental conditions, including the effect of postdepositional oxidation. A comparison with benthic foraminifera assemblages in a core recovered close to Lybia reveals that holococcolith preservation is enhanced during seafloor reventilation and benthic foraminiferal repopulation in the middle to upper part of the record, before the actual sapropel termination. There are two such events of improved deep‐water oxygenation in the Aegean and Adriatic Seas at 8.2 and 7.4 ka. The latter episode marks the onset of the transition to restored circulation in the eastern Mediterranean Sea, due to resumption of deep‐water formation in the southern Aegean Sea and the conclusion of enhanced biogenic productivity.

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Section: Resultsmentioning

confidence: 53%

Reventilation Episodes During the Sapropel S1 Deposition in the Eastern Mediterranean Based on Holococcolith Preservation

Incarbona

Abu-Zied

Rohling

et al. 2019

Paleoceanog and Paleoclimatol

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“…This impacted the temperature and moisture gradients across the Mediterranean with consequences for the water exchange between the Mediterranean and the North Atlantic [ Cacho et al , ; Rogerson et al , ; Rodrigo‐Gámiz et al , ]. The combined influence of these changes impacted the Mediterranean marine system in its entirety including perturbations of the vertical stratification and trophic levels, ecosystems, and the thermohaline circulation at large [ Sierro et al , ; Incarbona et al , ; Sprovieri et al , ; Di Stefano et al , , ]. Comparison with pollen sequences [ Gasse and Van Campo , ; deMenocal and Baker , ; Combourieu‐Nebout et al , ; Sánchez‐Goñi et al , ; Combourieu‐Nebout et al , ; Incarbona et al , ] and speleothem profiles [ Allen and Huntley , ; McDermott , ; Genty et al , ; Drysdale et al , ; Zanchetta et al , ; Couchoud et al , ; Moreno et al , ] made a strong case of a tight coupling of Mediterranean marine paleoclimatology and terrestrial climate variability over the surrounding borderlands.…”

Section: Discussionmentioning

confidence: 99%

“…The imprints of Heinrich events were traced across the Mediterranean and were suggested to be linked with the advection of subpolar low-salinity water from the North Atlantic and coincident polar air outbreaks over the Mediterranean [Cacho, 1999;Rohling et al, 2002;Cacho et al, 2006;Frigola et al, 2008;Rodrigo-Gámiz et al, 2011;Sprovieri et al, 2012;Di Stefano et al, 2015]. Comparison with the hydrographic imprint of H1 shows that the δ 18 O sw anomaly produced by H11 at ODP976 was about twice as high and lasted approximately 30% longer than H1.…”

Section: The Mis6-t2-mis5e Sequencementioning

confidence: 98%

Offset timing of climate oscillations during the last two glacial‐interglacial transitions connected with large‐scale freshwater perturbation

Jimenez-Amat

Zahn

2015

Paleoceanography

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Th-dated speleothem timescale to ODP976 suggests glacial conditions in the Northeast Atlantic region were terminated abruptly and interglacial warmth was reached in less than a millennium. The early-MIS5e cooling and freshening at ODP976 coincided with similar changes at North Atlantic sites suggesting this was a basin-wide event. By analogy with T1, we argue that this was a YD-type event that was shifted into the early stages of the last interglacial period. This scenario is consistent with evidence from northern North Atlantic and Nordic Sea sites that the continuing disintegration of the large Saalian Stage (MIS6) ice sheet in Eurasia delayed the advection of warm North Atlantic waters and full-strength convective overturn until later stages of MIS5e.

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“…Enhanced Atlantic surface water inflow, which is nutrient-enriched compared to Mediterranean water, may have fuelled phytoplankton blooming (Ausín et al, 2015). This mechanism is potentially suitable to increase productivity in a large sector of the western-central Mediterranean Sea, because the response of nutrient dynamics to late Quaternary climatic variations seems to be similar in the Sicily Channel and Alboran, southern Tyrrhenian and Balearic Seas (Incarbona et al, 2013;Di Stefano et al, 2015). This is especially true for the Egadi Archipelago region, where long time series estimates of chlorophyll concentration by satellite imagery demonstrate that approximately 80% of the variance is explained by the advection of chlorophyll-and nutrient-enriched Atlantic Water (Rinaldi et al, 2014).…”

Section: Late Mesolithic/early Neolithic (Late Holocene)mentioning

confidence: 99%

Late Pleistocene-Holocene coastal adaptation in central Mediterranean: Snapshots from Grotta d’Oriente (NW Sicily)

Colonese

Vetro

Landini

et al. 2018

Quaternary International

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Marine faunal remains from Grotta d'Oriente (Favignana Island, NW Sicily) offer invaluable snapshots of human-coastal environment interaction in the central Mediterranean from the Late Pleistocene to the Middle Holocene. The long-term shellfish and fish records reflect human exploitation of coastal environments undergoing considerable reorganizations during the postglacial sea level rise and the progressive isolation of Favignana from mainland Sicily. We detected an intensification of marine resource exploitation between ~9.6 ka and ~7.8 ka BP, which corresponds with the isolation of Favignana Island and, later on, with the introduction of early agro-pastoral economy in this region. We suggest that a higher investment in marine resource exploitation by late foragers and early farmers in NW Sicily was also supported by an increase in marine productivity in the south Tyrrhenian Sea in the Middle Holocene.

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Mediterranean coccolith ecobiostratigraphy since the penultimate Glacial (the last 145,000years) and ecobioevent traceability

Cited by 20 publications

References 98 publications

Reventilation Episodes During the Sapropel S1 Deposition in the Eastern Mediterranean Based on Holococcolith Preservation

Reventilation Episodes During the Sapropel S1 Deposition in the Eastern Mediterranean Based on Holococcolith Preservation

Offset timing of climate oscillations during the last two glacial‐interglacial transitions connected with large‐scale freshwater perturbation

Late Pleistocene-Holocene coastal adaptation in central Mediterranean: Snapshots from Grotta d’Oriente (NW Sicily)

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