Palaeoceanography of the last glacial maximum in the eastern Indian Ocean: Planktonic foraminiferal evidence

Vista sencilla de ítem
dc.citation.journalTitlePALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
dc.contributor.authorMartínez, J.I.spa
dc.contributor.authorDe Deckker, P.spa
dc.contributor.authorBarrows, T.T.spa
dc.contributor.departmentUniversidad EAFIT. Departamento de Geologíaspa
dc.contributor.researchgroupCiencias del Marspa
dc.date.accessioned2021-03-23T20:20:26Z
dc.date.available2021-03-23T20:20:26Z
dc.date.issued1999-01-01
dc.description.abstractPalaeoceanographic conditions in the eastern Indian Ocean for the last ~30 kyr are documented by means of planktonic foraminiferal analyses of 10 gravity cores. Quantitative foraminiferal analysis (%), Q-mode factor analysis, the modern analog technique (MAT) and oxygen-isotope analyses are used. A conspicuous increase during the last glacial maximum (LGM) of foraminiferal fragmentation resulting from a more productive Java upwelling system and/or a more corrosive Antarctic Intermediate Water (AAIW) was found at intermediate water depths (~1000 m). Contrasting Q-mode factors based on foraminifera between today and the LGM suggest changes in the thermocline depth, sea-surface temperature (SST), upwelling, and the strength of both the Australasian Mediterranean Water (AAMW) and the Indian Central Water (ICW). The decrease in the percentage abundance of shallow-dwelling and symbiont-bearing planktonic foraminifera, the increase in percentage of the upwelling-related species Globorotalia cultrata and Neogloboquadrina dutertrei, and factor 3 (dominated by Globorotalia tumida and Globigerinella siphonifera) suggest a stronger Java upwelling system during the LGM. A steeper, steric latitudinal gradient (in the presence of a weak Leeuwin Current), and a geostrophic flow similar to today's is postulated for the LGM, and this must have prevented upwelling offshore Western Australia. Today's AAMW-ICW sharp front was weaker during the LGM when the AAMW was saltier, cooler, and nutrient richer and more similar to the ICW. During the LGM, a more gentle SST latitudinal gradient over the ~16 to ~23°S region contrasts with today's steeper conditions at the AAMW-ICW Front. Also, for the LGM, a nutrient-rich ICW may explain previously documented increases in mass accumulation rates of CaCO3, organic carbon and benthonic foraminifera in a region where the nutricline was deep and within the lower euphotic zone.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1857
dc.identifier.doi10.1016/S0031-0182(98)00153-9
dc.identifier.issn00310182
dc.identifier.issn1872616X
dc.identifier.otherWOS;000078570100004
dc.identifier.otherSCOPUS;2-s2.0-0344889094
dc.identifier.urihttp://hdl.handle.net/10784/26896
dc.language.isoengeng
dc.publisherELSEVIER SCIENCE BV
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-0344889094&doi=10.1016%2fS0031-0182%2898%2900153-9&partnerID=40&md5=998aa851fcd566a194345202f409cc54
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0031-0182
dc.sourcePALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
dc.subject.keywordLast Glacial Maximumeng
dc.subject.keywordpaleoceanographyeng
dc.subject.keywordIndian Oceaneng
dc.subject.keywordForaminiferaeng
dc.subject.keywordGlobigerinella siphoniferaeng
dc.subject.keywordGloborotalia cultrataeng
dc.subject.keywordGloborotalia tumidaeng
dc.subject.keywordNeogloboquadrina dutertreieng
dc.titlePalaeoceanography of the last glacial maximum in the eastern Indian Ocean: Planktonic foraminiferal evidenceeng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

Archivos

Colecciones

Artículos (Ciencias del Mar)