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The structure of incipient coastal counter currents in South Portugal as indicator of their forcing agents

2021-02Journal article Restricted access
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dc.contributor.authorDe Oliveira Júnior, Luciano
dc.contributor.authorGarel, Erwan
dc.contributor.authorRelvas, Paulo
dc.date.accessioned2021-02-22T14:07:20Z
dc.date.available2023-02-01T01:30:15Z
dc.date.issued2021-02
dc.date.updated2021-02-22T13:14:18Z
dc.description.abstractThe alongshore subtidal water circulation along the South Portugal inner shelf is characterized by the temporal alternation of equatorward (i.e., broadly eastward) flows related to coastal upwelling processes and poleward (i.e., broadly westward) Coastal Counter Currents (CCCs). The objective of this study is to get insights about the main drivers of CCCs based on kinematic parameters describing the structure of the flow at the moment it changes direction. The parameters are derived from an extensive bottom-mounted ADCP dataset (16 deployments; 34,121 hourly records) collected at a single mooring (23 m water depth). Results show that the so-called incipient flows present contrasted general patterns whether they turn from equatorward to poleward or the opposite. Complementary observations at a nearby station indicate that these characteristics are spatially consistent along the studied area. Although 70% of CCCs are generated under favourable wind conditions (Levanter), these flows generally develop through the bed layer, in particular in summer. Hence, the Levanter wind - expected to promote flow setup through the surface layer - is not the main driver of CCCs in most cases. The general structure of incipient CCCs strongly suggests that the dominant force competing with the wind stress is an alongshore pressure gradient (APG). Furthermore, the maximum equatorward flow magnitude before CCCs setup is significantly correlated with the following (poleward) acceleration of incipient CCCs near the bed. Such relation is consistent with the development of CCCs due to the unbalance of an APG (produced during active upwelling) when wind relaxes. This process is further supported by an analysis of the depth-averaged momentum equation which suggests that the coastal circulation is mainly driven by linear dynamics in the region.pt_PT
dc.description.sponsorshipIF/00661/2014/CP1234, SFRH/BD/140250/ 2018, UID/Multi/04326/2019pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.jmarsys.2020.103486pt_PT
dc.identifier.issn0924-7963
dc.identifier.slugcv-prod-2239262
dc.identifier.urihttp://hdl.handle.net/10400.1/15133
dc.language.isoporpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.subjectCoastal flowpt_PT
dc.subjectUpwelling circulationpt_PT
dc.subjectFlow reversalpt_PT
dc.subjectAlongshore pressure gradientpt_PT
dc.subjectGulf of Cadizpt_PT
dc.titleThe structure of incipient coastal counter currents in South Portugal as indicator of their forcing agentspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage103486pt_PT
oaire.citation.titleJournal of Marine Systemspt_PT
oaire.citation.volume214pt_PT
person.familyNamede Oliveira Júnior
person.familyNameGarel
person.familyNameRelvas
person.givenNameLuciano
person.givenNameErwan
person.givenNamePaulo
person.identifier.ciencia-idEA1D-0D5C-8C56
person.identifier.ciencia-id5D13-7EA7-6C6D
person.identifier.ciencia-id2412-1F65-A044
person.identifier.orcid0000-0001-5899-2979
person.identifier.orcid0000-0002-4584-9759
person.identifier.orcid0000-0002-6404-5895
person.identifier.ridN-9811-2014
person.identifier.ridB-1257-2008
person.identifier.scopus-author-id23491739700
person.identifier.scopus-author-id6505976206
rcaap.cv.cienciaidEA1D-0D5C-8C56 | Luciao de Oliveira Júnior
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationbdfdf659-6b7b-4ef9-ac90-2781469b8946
relation.isAuthorOfPublication7e619cba-3bfb-4964-bdf3-b8afd91a4a29
relation.isAuthorOfPublication94f4d10b-242d-4560-b716-6375f1a01eac
relation.isAuthorOfPublication.latestForDiscoverybdfdf659-6b7b-4ef9-ac90-2781469b8946

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