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The signature of NAO and EA climate patterns on the vertical structure of the canary current upwelling system

2023Journal article Open access
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dc.contributor.authorGeorg, Tina
dc.contributor.authorNeves, Maria
dc.contributor.authorRelvas, Paulo
dc.date.accessioned2023-05-09T08:48:51Z
dc.date.available2023-05-09T08:48:51Z
dc.date.issued2023
dc.description.abstractThe current study aims to analyse the vertical structure of the ocean during upwelling events using in situ and modelled data. Additionally, the influence of climate patterns, namely the North Atlantic Oscillation (NAO) and the East Atlantic (EA) pattern, on the vertical structure and their impact on the upwelling activity are assessed for a period of 25 years (1993-2017). The study focuses on the central part of the Canary Current (25-35 degrees N) with persistent upwelling throughout the year, with an annual cycle and the strongest events from June to September. Upwelling is determined using two different approaches: one index is calculated based on temperature differences between the coastal and the offshore area, and the other is calculated based on wind data and the resulting Ekman transport. Different datasets were chosen according to the indices. Stable coastal upwelling can be observed in the study area for the analysed time span, with differences throughout the latitudes. A deepening of the isothermal layer depth and a cooling of temperatures are observed in the vertical structure of coastal waters, representing a deeper mixing of the ocean and the rise of cooler, denser water towards the surface. During years of a positive NAO, corresponding to a strengthening of the Azores High and the Icelandic Low, stronger winds lead to an intensification of the upwelling activity, an enhanced mixing of the upper ocean, and a deeper (shallower) isothermal layer along the coast (offshore). The opposite is observed in years of negative NAO. Both effects are enhanced in years with a coupled, opposite phase of the EA pattern and are mainly visible during winter months, where the effect of both indices is the greatest. The study therefore suggests that upwelling activities are stronger in winters of positive North Atlantic Oscillation coupled with a negative East Atlantic pattern and emphasizes the importance of interactions between the climate patterns and upwelling.pt_PT
dc.description.sponsorshipLA/P/0101/2020pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.5194/os-19-351-2023pt_PT
dc.identifier.issn1812-0784
dc.identifier.urihttp://hdl.handle.net/10400.1/19521
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherEuropean Geosciences Unionpt_PT
dc.relationAlgarve Centre for Marine Sciences
dc.relationAlgarve Centre for Marine Sciences
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectMixed layer depthpt_PT
dc.subjectSea surface temperaturept_PT
dc.subjectNorth atlantic oscillationpt_PT
dc.subjectBarrier layerpt_PT
dc.subjectVariabilitypt_PT
dc.subjectTrendspt_PT
dc.subjectIntensificationpt_PT
dc.subjectPrecipitationpt_PT
dc.subjectPortugalpt_PT
dc.subjectAfricapt_PT
dc.titleThe signature of NAO and EA climate patterns on the vertical structure of the canary current upwelling systempt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04326%2F2020/PT
oaire.citation.endPage361pt_PT
oaire.citation.issue2pt_PT
oaire.citation.startPage351pt_PT
oaire.citation.titleOcean Sciencept_PT
oaire.citation.volume19pt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
person.familyNameNeves
person.familyNameRelvas
person.givenNameMaria
person.givenNamePaulo
person.identifier.ciencia-idD91F-2EE5-E2E2
person.identifier.ciencia-idF016-4214-4A45
person.identifier.ciencia-id2412-1F65-A044
person.identifier.orcid0000-0001-5726-3467
person.identifier.orcid0000-0002-6404-5895
person.identifier.ridA-7703-2013
person.identifier.ridB-1257-2008
person.identifier.scopus-author-id7103415176
person.identifier.scopus-author-id6505976206
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.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication5aa08a50-0e64-4d5d-acd6-d817b92e74c5
relation.isAuthorOfPublication94f4d10b-242d-4560-b716-6375f1a01eac
relation.isAuthorOfPublication.latestForDiscovery94f4d10b-242d-4560-b716-6375f1a01eac
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