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

Incarbona, Alessandro; Abu-Zied, Ramadan H.; Rohling, Eelco; Ziveri, Patrizia

Description

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...[Show more]

dc.contributor.authorIncarbona, Alessandro
dc.contributor.authorAbu-Zied, Ramadan H.
dc.contributor.authorRohling, Eelco
dc.contributor.authorZiveri, Patrizia
dc.date.accessioned2020-07-20T00:43:18Z
dc.date.available2020-07-20T00:43:18Z
dc.identifier.issn1944-9186
dc.identifier.urihttp://hdl.handle.net/1885/206374
dc.description.abstractOrganic‐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.
dc.description.sponsorshipA. I. acknowledges funding by Italian Ministry of Education, Universities and Research through Grant PJ_RIC_FFABR_2017_161560
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherWiley
dc.rights©2019. American Geophysical Union
dc.sourcePaleoceanography and Paleoclimatology
dc.titleReventilation Episodes During the Sapropel S1 Deposition in the Eastern Mediterranean Based on Holococcolith Preservation
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume34
dc.date.issued2019-10-11
local.identifier.absfor040305 - Marine Geoscience
local.identifier.absfor049999 - Earth Sciences not elsewhere classified
local.identifier.ariespublicationu3102795xPUB5403
local.publisher.urlhttps://www.wiley.com/en-gb
local.type.statusPublished Version
local.contributor.affiliationIncarbona, Alessandro, Università di Palermo
local.contributor.affiliationAbu-Zied, Ramadan H., King Abdulaziz University
local.contributor.affiliationRohling, Eelco, College of Science, ANU
local.contributor.affiliationZiveri, Patrizia, Universitat Autònoma de Barcelona
local.bibliographicCitation.issue10
local.bibliographicCitation.startpage1597
local.bibliographicCitation.lastpage1609
local.identifier.doi10.1029/2019PA003626
local.identifier.absseo960304 - Climate Variability (excl. Social Impacts)
dc.date.updated2020-04-12T08:18:47Z
local.identifier.scopusID2-s2.0-85074035455
dcterms.accessRightsOpen Access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/23864..."Published version can be archived in an institutional repository. 6 months embargo" from SHERPA/RoMEO site (as at 20/07/2020). An edited version of this paper was published by AGU. Copyright 2019 American Geophysical Union
CollectionsANU Research Publications

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