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A two million year record of low-latitude aridity linked to continental weathering from the Maldives

2018-12-18Journal article Open Access
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dc.contributor.authorKunkelova, Tereza
dc.contributor.authorJung, Simon J. A.
dc.contributor.authorde Leau, Erica S.
dc.contributor.authorOdling, Nick
dc.contributor.authorThomas, Alex L.
dc.contributor.authorBetzler, Christian
dc.contributor.authorEberli, Gregor P.
dc.contributor.authorAlvarez-Zarikian, Carlos A.
dc.contributor.authorAlonso-Garcia, Montserrat
dc.contributor.authorBialik, Or M.
dc.contributor.authorBlättler, Clara L.
dc.contributor.authorGuo, Junhua A.
dc.contributor.authorHaffen, Sébastien
dc.contributor.authorHorozal, Senay
dc.contributor.authorMee, Anna L. H.
dc.contributor.authorInoue, Mayuri
dc.contributor.authorJovane, Luigi
dc.contributor.authorLanci, Luca
dc.contributor.authorLaya, Juan C.
dc.contributor.authorLüdmann, Thomas
dc.contributor.authorBejugam, Nagender N.
dc.contributor.authorNakakuni, Masatoshi
dc.contributor.authorNiino, Kaoru
dc.contributor.authorPetruny, Loren M.
dc.contributor.authorPratiwi, Santi D.
dc.contributor.authorReijmer, John J. G.
dc.contributor.authorReolid, Jesús
dc.contributor.authorSlagle, Angela L.
dc.contributor.authorSloss, Craig R.
dc.contributor.authorSu, Xiang
dc.contributor.authorSwart, Peter K.
dc.contributor.authorWright, James D.
dc.contributor.authorYao, Zhengquan
dc.contributor.authorYoung, Jeremy R.
dc.contributor.authorLindhorst, Sebastian
dc.contributor.authorStainbank, Stephanie
dc.contributor.authorRueggeberg, Andres
dc.contributor.authorSpezzaferri, Silvia
dc.contributor.authorCarrasqueira, Igor
dc.contributor.authorHu, Siyao
dc.contributor.authorKroon, Dick
dc.date.accessioned2019-01-09T13:18:52Z
dc.date.available2019-01-09T13:18:52Z
dc.date.issued2018-12-18
dc.date.updated2019-01-01T07:34:18Z
dc.descriptionTem uma correção em http://hdl.handle.net/10400.1/12390
dc.description.abstractIndian-Asian monsoon has oscillated between warm/wet interglacial periods and cool/dry glacial periods with periodicities closely linked to variations in Earth’s orbital parameters. However, processes that control wet versus dry, i.e. aridity cyclical periods on the orbital time-scale in the low latitudes of the Indian-Asian continent remain poorly understood because records over millions of years are scarce. The sedimentary record from International Ocean Discovery Program (IODP) Expedition 359 provides a well-preserved, high-resolution, continuous archive of lithogenic input from the Maldives reflecting on low-latitude aridity cycles. Variability within the lithogenic component of sedimentary deposits of the Maldives results from changes in monsoon-controlled sedimentary sources. Here, we present X-ray fluorescence (XRF) core-scanning results from IODP Site U1467 for the past two million years, allowing full investigation of orbital periodicities. We specifically use the Fe/K as a terrestrial climate proxy reflecting on wet versus dry conditions in the source areas of the Indian-Asian landmass, or from further afield. The Fe/K record shows orbitally forced cycles reflecting on changes in the relative importance of aeolian (stronger winter monsoon) during glacial periods versus fluvial supply (stronger summer monsoon) during interglacial periods. For our chronology, we tuned the Fe/K cycles to precessional insolation changes, linking Fe/K maxima/minima to insolation minima/maxima with zero phase lag. Wavelet and spectral analyses of the Fe/K record show increased dominance of the 100 kyr cycles after the Mid Pleistocene Transition (MPT) at 1.25 Ma in tandem with the global ice volume benthic δ18O data (LR04 record). In contrast to the LR04 record, the Fe/K profile resolves 100-kyr-like cycles around the 130 kyr frequency band in the interval from 1.25 to 2 million years. These 100-kyr-like cycles likely form by bundling of two or three obliquity cycles, indicating that low-latitude Indian-Asian climate variability reflects on increased tilt sensitivity to regional eccentricity insolation changes (pacing tilt cycles) prior to the MPT. The implication of appearance of the 100 kyr cycles in the LR04 and the Fe/K records since the MPT suggests strengthening of a climate link between the low and high latitudes during this period of climate transition.pt_PT
dc.description.sponsorshipSFRH/BPD/96960/2013; PTDC/MAR-PRO/3396/2014pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationProgress in Earth and Planetary Science. 2018 Dec 18;5(1):86pt_PT
dc.identifier.dois40645-018-0238-xpt_PT
dc.identifier.urihttp://hdl.handle.net/10400.1/12287
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherBMCpt_PT
dc.rights.holderThe Author(s).
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectMaldivespt_PT
dc.subjectOrbital cyclespt_PT
dc.subjectIndian-Asian history of ariditypt_PT
dc.subjectMid Pleistocene transitionpt_PT
dc.subjectNon-destructive core scanningpt_PT
dc.subjectComposition of lithogenic fractionpt_PT
dc.subjectIODP Exp 359pt_PT
dc.titleA two million year record of low-latitude aridity linked to continental weathering from the Maldivespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMulti%2F04326%2F2013/PT
oaire.citation.issue1pt_PT
oaire.citation.startPage86pt_PT
oaire.citation.titleProgress in Earth and Planetary Sciencept_PT
oaire.citation.volume5pt_PT
oaire.fundingStream5876
person.familyNameAlonso-Garcia
person.givenNameMontserrat
person.identifier.ciencia-id5B1B-33EE-50B9
person.identifier.orcid0000-0002-0241-2178
person.identifier.scopus-author-id51565655800
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication7772f374-a9c2-41e7-a798-4d811b8a9a48
relation.isAuthorOfPublication.latestForDiscovery7772f374-a9c2-41e7-a798-4d811b8a9a48
relation.isProjectOfPublication868b4818-3efa-4edb-9202-c464d64fd38f
relation.isProjectOfPublication.latestForDiscovery868b4818-3efa-4edb-9202-c464d64fd38f

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