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The role of climate, marine influence and sedimentation rates in late-Holocene estuarine evolution (SW Portugal)

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dc.contributor.authorCosta, Ana Maria
dc.contributor.authorFreitas, Maria da Conceição
dc.contributor.authorLeira, Manel
dc.contributor.authorCostas, Susana
dc.contributor.authorCosta, Pedro JM
dc.contributor.authorAndrade, César
dc.contributor.authorBao, Roberto
dc.contributor.authorDuarte, João
dc.contributor.authorRodrigues, Aurora
dc.contributor.authorCachão, Mário
dc.contributor.authorAraújo, Ana Cristina
dc.contributor.authorDiniz, Mariana
dc.contributor.authorArias, Pablo
dc.date.accessioned2020-04-23T09:08:50Z
dc.date.available2020-04-23T09:08:50Z
dc.date.issued2019
dc.description.abstractEstuaries are sensitive to changes in global to regional sea level, to climate-driven variation in rainfall and to fluvial discharge. In this study, we use source and environmentally sensitive proxies together with radiocarbon dating to examine a 7-m-thick sedimentary record from the Sado estuary accumulated throughout the last 3.6 kyr. The lithofacies, geochemistry and diatom assemblages in the sediments accumulated between 3570 and 3240 cal. BP indicate a mixture between terrestrial and marine sources. The relative contribution of each source varied through time as sedimentation progressed in a low intertidal to high subtidal and low-energy accreting tidal flat. The sedimentation proceeded under a general pattern of drier and higher aridity conditions, punctuated by century-long changes of the rainfall regime that mirror an increase in storminess that affected SW Portugal and Europe. The sediment sequence contains evidence of two periods characterized by downstream displacement of the estuarine/freshwater transitional boundary, dated to 3570–3400 cal. BP and 3300–3240 cal. BP. These are intercalated by one episode where marine influence shifted upstream. All sedimentation episodes developed under high terrestrial sediment delivery to this transitional region, leading to exceptionally high sedimentation rates, independently of the relative expression of terrestrial/marine influences in sediment facies. Our data show that these disturbances are mainly climate-driven and related to variations in rainfall and only secondarily with regional sea-level oscillations. From 3240 cal. BP onwards, an abrupt change in sediment facies is noted, in which the silting estuarine bottom reaches mean sea level and continued accreting until present under prevailing freshwater conditions, the tidal flat changing to an alluvial plain. The environmental modification is accompanied by a pronounced change in sedimentation rate that decreased by two orders of magnitude, reflecting the loss of accommodation space rather than the influence of climate or regional sea-level drivers.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCosta, A. M., Freitas, M. d. C., Leira, M., Costas, S., Costa, P. J. M., Andrade, C., . . . Arias, P. (2019). The role of climate, marine influence and sedimentation rates in late-Holocene estuarine evolution (SW Portugal). The Holocene, 29(4) 622-632. doi: 10.1177/0959683618824768pt_PT
dc.identifier.doi10.1177/0959683618824768pt_PT
dc.identifier.issn0959-6836
dc.identifier.issn1477-0911
dc.identifier.urihttp://hdl.handle.net/10451/43075
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSAGE Publicationspt_PT
dc.relationPTDC/HISARQ/121592/2010pt_PT
dc.relationThe Lower Sado valley 8000 years ago: relations between environmental events and cultural adaptations
dc.relation.publisherversionhttps://journals.sagepub.com/doi/full/10.1177/0959683618824768pt_PT
dc.subjectClimate variabilitypt_PT
dc.subjectEnvironmental proxiespt_PT
dc.subjectFluvial dischargept_PT
dc.subjectSea-level oscillationpt_PT
dc.subjectStorminesspt_PT
dc.titleThe role of climate, marine influence and sedimentation rates in late-Holocene estuarine evolution (SW Portugal)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberSFRH/BD/110270/2015
oaire.awardNumberUID/GEO/50019/2013
oaire.awardTitleThe Lower Sado valley 8000 years ago: relations between environmental events and cultural adaptations
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/SFRH%2FBD%2F110270%2F2015/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FGEO%2F50019%2F2013/PT
oaire.citation.endPage632pt_PT
oaire.citation.startPage622pt_PT
oaire.citation.titleHolocenept_PT
oaire.citation.volume29(4)pt_PT
oaire.fundingStreamOE
oaire.fundingStream5876
person.familyNameAraújo
person.familyNameDiniz
person.givenNameAna Cristina
person.givenNameMariana
person.identifier.ciencia-id7B1D-1776-30D6
person.identifier.ciencia-idB617-68B0-E4AB
person.identifier.orcid0000-0002-3693-9664
person.identifier.orcid0000-0001-7491-7864
person.identifier.ridL-7887-2013
person.identifier.scopus-author-id37074106700
person.identifier.scopus-author-id56959988800
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.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication134d6cde-3b4c-43bf-959d-eb33dce06ac8
relation.isAuthorOfPublication266aacc1-40e9-4d67-952e-9fa257755061
relation.isAuthorOfPublication.latestForDiscovery266aacc1-40e9-4d67-952e-9fa257755061
relation.isProjectOfPublicatione739ae9b-9aeb-43a8-ab72-c34b064d9971
relation.isProjectOfPublication54ea4bcc-fe9d-41b3-b481-4b430eec469c
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