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Coccolithophore productivity at the western Iberian Margin during the Middle Pleistocene (310–455 ka) – evidence from coccolith Sr∕Ca data

2020Journal article Open Access
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dc.contributor.authorCavaleiro, Catarina
dc.contributor.authorVoelker, Antje
dc.contributor.authorStoll, Heather
dc.contributor.authorBaumann, Karl-Heinz
dc.contributor.authorKucera, Michal
dc.date.accessioned2020-12-11T09:49:46Z
dc.date.available2020-12-11T09:49:46Z
dc.date.issued2020
dc.description.abstractCoccolithophores contribute significantly to marine primary productivity and play a unique role in ocean biogeochemistry by using carbon for photosynthesis (soft-tissue pump) and for calcification (carbonate counter pump). Despite the importance of including coccolithophores in Earth system models to allow better predictions of the climate system’s responses to planetary change, the reconstruction of coccolithophore productivity mostly relied on proxies dependent on accumulation and sedimentation rates and preservation conditions. In this study we used an independent proxy, based on the coccolith fraction (CF) Sr=Ca ratio, to reconstruct coccolithophore productivity. We studied the marine sediment core MD03-2699 from the western Iberian margin (IbM), concentrating on glacial–interglacial cycles of Marine Isotopic Stage (MIS) 12 to MIS 9. We found that IbM coccolithophore productivity was controlled by changes in the oceanographic conditions, such as in sea surface temperature (SST) and nutrient availability, and by competition with other phytoplankton groups. Long-term coccolithophore productivity was primarily affected by variations in the dominant surface water mass. Polar and subpolar surface waters during glacial substages were associated with decreased coccolithophore productivity, with the strongest productivity minima concomitant with Heinrich-type events (HtEs). Subtropical, nutrient-poorer waters, increased terrigenous input, and moderate to strong upwelling during the deglaciation and early MIS11 are hypothesized to have attributed a competitive advantage to diatoms to the detriment of coccolithophores, resulting in intermediate coccolithophore productivity levels. During the progression towards full glacial conditions an increasing presence of nutrient-richer waters, related to the growing influence of transitional surface waters and/or intensified upwelling, probably stimulated coccolithophore productivity to maxima following the rapid depletion of silica by diatoms. We present conceptual models of the carbon and carbonate cycle components for the IbM in different time slices that might serve as a basis for further investigation and modelling experiments.pt_PT
dc.description.sponsorshipFundação para a Ciência e a Tecnologia CCMAR (UID/Multi/04326/2019), (IF/01500/2014).pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.5194/cp-16-2017-2020pt_PT
dc.identifier.issn1814-9324
dc.identifier.urihttp://hdl.handle.net/10400.1/14896
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherEuropean Geosciences Unionpt_PT
dc.relationPast Ocean Circulation and Productivity Changes on the Portuguese Margin and in the Open North Atlantic: Northern Hemisphere - Antarctica Linkages 380,000 to 800,000 years ago (PORTO)
dc.relationRapid changes in interglacial surface and deep-water properties in the North Atlantic:temperature, nutrient and density variability derived from trace element analysis (INTER-TRACE)
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.titleCoccolithophore productivity at the western Iberian Margin during the Middle Pleistocene (310–455 ka) – evidence from coccolith Sr∕Ca datapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitlePast Ocean Circulation and Productivity Changes on the Portuguese Margin and in the Open North Atlantic: Northern Hemisphere - Antarctica Linkages 380,000 to 800,000 years ago (PORTO)
oaire.awardTitleRapid changes in interglacial surface and deep-water properties in the North Atlantic:temperature, nutrient and density variability derived from trace element analysis (INTER-TRACE)
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/PDCT/PDCT%2FMAR%2F58282%2F2004/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FCLI%2F70772%2F2006/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F84187%2F2012/PT
oaire.citation.endPage2037pt_PT
oaire.citation.issue6pt_PT
oaire.citation.startPage2017pt_PT
oaire.citation.titleClimate of the Pastpt_PT
oaire.citation.volume16pt_PT
oaire.fundingStreamPDCT
oaire.fundingStream5876-PPCDTI
oaire.fundingStreamSFRH
person.familyNameDinis Cavaleiro
person.familyNameVoelker
person.givenNameCatarina
person.givenNameAntje
person.identifier2315310
person.identifier.ciencia-idBB1D-BF26-CE0C
person.identifier.ciencia-idC11E-D8E6-CDFA
person.identifier.orcid0000-0002-1881-6660
person.identifier.orcid0000-0001-6465-6023
person.identifier.ridC-5427-2012
person.identifier.scopus-author-id8784446000
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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