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Ostracod response to monsoon and OMZ variability over the past 1.2 Myr

2022-06Journal article Restricted
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dc.contributor.authorAlvarez Zarikian, Carlos A.
dc.contributor.authorNadiri, Chimnaz
dc.contributor.authorAlonso-Garcia, Montserrat
dc.contributor.authorRodrigues, Teresa
dc.contributor.authorHuang, Huai-Hsuan M.
dc.contributor.authorLindhorst, Sebastian
dc.contributor.authorKunkelova, Tereza
dc.contributor.authorKroon, Dick
dc.contributor.authorBetzler, Christian
dc.contributor.authorYasuhara, Moriaki
dc.date.accessioned2022-12-09T12:51:32Z
dc.date.available2022-12-09T12:51:32Z
dc.date.issued2022-06
dc.description.abstractWe present the first continuous middle through late Pleistocene record of fossil ostracods from the Maldives in the northern Indian Ocean, derived from sediment cores taken at Site U1467 by Expedition 359 of the International Ocean Discovery Program (IODP). Site U1467 lies at 487 m water depth in the Inner Sea of the Maldives archipelago, an ideal place for studying the effects of the South Asian Monsoon (SAM) system on primary productivity, intermediate depth ocean circulation, and the regional oxygen minimum zone (OMZ). The Inner Sea acts as a natural sediment trap that has undergone continuous sedimentation for millions of years with minor terrestrial influence. Our record spans from Marine Isotope Stage (MIS) 35 to the present, covering the mid Pleistocene transition (1.2-0.6 Ma) and the Mid-Brunhes Event (MBE, at similar to 480 ka) the time when ice age cycles transitioned from occurring every 40,000 years to 100,000 years. The ostracod data is interpreted alongside the existing datasets from the same site of sedimentological (grain-size) and XRF-elemental analyses, and new organic biomarker data also from Site U1467. These datasets support the paleoenvironmental interpretation of the ostracod assemblages. Ostracods are abundant and diverse, displaying a prominent change in faunal composition at the MBE related to the increase in the amplitude of glacial-interglacial cycles, which deeply affected the monsoon system and thereby the past oceanographic conditions of the Maldives Inner Sea. Furthermore, ostracods exhibit distinctly different assemblages across glacial-interglacial cycles, particularly after the MBE, and these changes convincingly correspond to variability of the OMZ. Glacial periods are characterized by ostracod indicators of well-oxygenated bottom water due to the intensification of the winter monsoon and the contraction of the OMZ. Abundant psychrospheric ostracods during glacials suggests that a southern sourced water mass, such as Antarctic Intermediate Water (AAIW) and/or Subantarctic Mode water, bathed the Maldives Inner Sea during glacial periods. In contrast, interglacial stages are characterized by ostracod species and biomarker data that indicate low-oxygen conditions and sluggish bottom water circulation pointing to an expansion of the regional OMZ due to the strengthening of the summer monsoon. Our results highlight the sensitivity of ostracods to oceanographic and climate variability.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.marmicro.2022.102105pt_PT
dc.identifier.eissn1872-6186
dc.identifier.urihttp://hdl.handle.net/10400.1/18609
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationCentre of Marine Sciences
dc.relationFeatures and lessons from Past Interglacials ? warm periods ? over the last 1.5 Ma
dc.subjectExpedition 359pt_PT
dc.subjectIODP Site U1467pt_PT
dc.subjectThe Maldivespt_PT
dc.subjectIndian Ocean paleoceanographypt_PT
dc.subjectPleistocenept_PT
dc.subjectSouth Asian monsoonpt_PT
dc.subjectOxygen Minimum Zonept_PT
dc.titleOstracod response to monsoon and OMZ variability over the past 1.2 Myrpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre of Marine Sciences
oaire.awardTitleFeatures and lessons from Past Interglacials ? warm periods ? over the last 1.5 Ma
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FMulti%2F04326%2F2019/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC%2FCTA-GEO%2F29897%2F2017/PT
oaire.citation.startPage102105pt_PT
oaire.citation.titleMarine Micropaleontologypt_PT
oaire.citation.volume174pt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream9471 - RIDTI
person.familyNameAlonso-Garcia
person.familyNameRodrigues
person.givenNameMontserrat
person.givenNameTeresa
person.identifier.ciencia-id5B1B-33EE-50B9
person.identifier.ciencia-idEC18-2390-9594
person.identifier.orcid0000-0002-0241-2178
person.identifier.orcid0000-0001-7811-7506
person.identifier.ridG-2912-2013
person.identifier.scopus-author-id51565655800
person.identifier.scopus-author-id7004330274
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
rcaap.contributor.authoremailmagracia@ualg.ptpt_PT
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication7772f374-a9c2-41e7-a798-4d811b8a9a48
relation.isAuthorOfPublication0a137e49-be7a-4e12-85e2-3def90980f7e
relation.isAuthorOfPublication.latestForDiscovery7772f374-a9c2-41e7-a798-4d811b8a9a48
relation.isProjectOfPublicationf38dbd9d-3734-4f3c-8d74-dff8dcaa8674
relation.isProjectOfPublication56bbcfa3-d0ad-4fbd-817a-b9fed5e36b76
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