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Control mechanisms of primary productivity revealed by Calcareous Nannoplankton from marine isotope stages 12 to 9 at the Shackleton Site (IODP Site U1385)

2021-06Journal article Open access
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dc.contributor.authorGonzález‐Lanchas, A.
dc.contributor.authorFlores, J.‐A.
dc.contributor.authorSierro, F. J.
dc.contributor.authorSánchez Goñi, M. F.
dc.contributor.authorRodrigues, Teresa
dc.contributor.authorAusín, B.
dc.contributor.authorOliveira, Dulce
dc.contributor.authorNaughton, F.
dc.contributor.authorMarino, M.
dc.contributor.authorMaiorano, P.
dc.contributor.authorBalestra, B.
dc.date.accessioned2021-07-13T15:51:41Z
dc.date.available2021-07-13T15:51:41Z
dc.date.issued2021-06
dc.description.abstractNowadays, primary productivity variations at the SW Iberian Margin (IbM) are primarily controlled by wind-driven upwelling. Thus, major changes in atmospheric circulation and wind regimes between the Marine Isotope Stages (MIS) 12 and 9 could have driven substantial changes in phytoplankton productivity which remains poorly understood. We present a high-resolution calcareous nannofossil record from the Shackleton Site Integrated Ocean Discovery Program Site U1385 that allow the assessment of primary productivity and changing surface conditions on orbital and suborbital timescales over the SW IbM. These records are directly compared and integrated with terrestrial – Mediterranean forest pollen – and marine – benthic and planktic oxygen stable isotopes (δ18O), alkenone concentration [C37], Uk´37-Sea Surface Temperature and % C37:4 – proxy records from Site U1385. Our results indicate intra-interglacial increase in primary productivity together with intensification of the Azores anticyclonic high-pressure cell beyond the summer that suggests a two-phase upwelling behavior during the full interglacial MIS 11c (420–397ka), potentially drived by atmospheric NAO-like variability. Primary productivity is largely enhanced during the inception of glacial MIS 10 and the early MIS 10 (392–356ka), linked to intensified upwelling and associated processes during a period of strengthened atmospheric circulation. In agreement with the conditions observed during Heinrich events of the last glacial cycle, primary productivity reductions during abrupt cold episodes, including the Heinrich-type (Ht) events 4 to 1 (436, 392, 384 and 339ka) and the Terminations V and IV, seems to be the result of halocline formation induced by meltwater arrival, reducing the regional upward nutrient transferencept_PT
dc.description.sponsorshipFPU17/03349, PTDC/CTA-GEO/29897/2017, UIDB/04326/2020, UIDB/04326/2020, CEECIND/02208/2017pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1029/2021PA004246pt_PT
dc.identifier.eissn2572-4525
dc.identifier.urihttp://hdl.handle.net/10400.1/16774
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherAmerican Geophysical Unionpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectCoccolithophorespt_PT
dc.subjectTipo Heinrichpt_PT
dc.subjectMargem Ibériapt_PT
dc.subjectBrunhes médiospt_PT
dc.subjectProdutividade primáriapt_PT
dc.subjectUpwellingpt_PT
dc.titleControl mechanisms of primary productivity revealed by Calcareous Nannoplankton from marine isotope stages 12 to 9 at the Shackleton Site (IODP Site U1385)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issue6pt_PT
oaire.citation.titlePaleoceanography and Paleoclimatologypt_PT
oaire.citation.volume36pt_PT
person.familyNameRodrigues
person.familyNameOliveira
person.familyNameNaughton
person.givenNameTeresa
person.givenNameDulce
person.givenNameFilipa
person.identifierR-001-TTY
person.identifierR-000-JPJ
person.identifier.ciencia-idEC18-2390-9594
person.identifier.ciencia-idA119-CA60-3C50
person.identifier.ciencia-id1419-F239-1CEA
person.identifier.orcid0000-0001-7811-7506
person.identifier.orcid0000-0002-3016-532X
person.identifier.orcid0000-0002-3055-9396
person.identifier.ridG-2912-2013
person.identifier.ridH-9855-2018
person.identifier.ridE-7659-2013
person.identifier.scopus-author-id7004330274
person.identifier.scopus-author-id56688169500
person.identifier.scopus-author-id23009659300
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication0a137e49-be7a-4e12-85e2-3def90980f7e
relation.isAuthorOfPublicationa18515cc-4754-4270-b542-e01bc11347d8
relation.isAuthorOfPublication53f17112-41aa-4bd9-a437-50736dbde6f9
relation.isAuthorOfPublication.latestForDiscovery0a137e49-be7a-4e12-85e2-3def90980f7e

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