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Windiness spells in SW Europe since the last glacial maximum

2016-02Journal article Open access
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dc.contributor.authorCostas, Susana
dc.contributor.authorNaughton, F.
dc.contributor.authorGoble, Ronald
dc.contributor.authorRenssen, Hans
dc.date.accessioned2017-04-07T15:57:09Z
dc.date.available2017-04-07T15:57:09Z
dc.date.issued2016-02
dc.description.abstractDunefields have a great potential to unravel past regimes of atmospheric circulation as they record direct traces of this component of the climate system. Along the Portuguese coast, transgressive dunefields represent relict features originated by intense and frequent westerly winds that largely contrast with present conditions, clearly dominated by weaker northwesterly winds. Optical dating and subsurface stratigraphy document three age clusters indicating main episodes of dune mobilization during: the last termination (20-11.6 ka), Middle Holocene (5.6 ka), and Late Holocene (1.2-0.98 and 0.4-0.15 ka).We find reconstructed windfields to be analogous during all episodes and dominated by strong westerlies. Yet, larger grain size diameters and dune volumes documented for the last termination support amplified patterns compatible with a southward shift and intensification of the North Atlantic westerlies during winters. Conversely, dunes deposited after the Middle Holocene are compatible with more variable windfields and weakened patterns controlled by interannual shifts towards low values of the North Atlantic Oscillation (NAO).This work demonstrates that present windfield regimes in southern Europe are not compatible with past aeolian activity. Indeed, present day analogs indicate that wind intensities compatible with past aeolian activity are rare at present (sediment transport potentials below estimates in the aeolian record), but can occur if the jet stream is diverted to the south (i.e. 30 degrees N with negative NAO index) or if very deep cyclones anchor around 50 degrees N, extending their influence to the western Portuguese coast (relatively low NAO index). However, these conditions represent temporary patterns lasting around one day, while we suggest that the identified episodes of aeolian activity may represent semi-permanent conditions. (C) 2016 Elsevier B.V. All rights reserved.
dc.identifier.doi10.1016/j.epsl.2015.12.023
dc.identifier.issn0012-821X
dc.identifier.urihttp://hdl.handle.net/10400.1/9623
dc.language.isoeng
dc.peerreviewedyes
dc.relationResilience-Increasing Strategies for Coasts - toolKIT
dc.relation.isbasedonWOS:000369680800009
dc.titleWindiness spells in SW Europe since the last glacial maximum
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleResilience-Increasing Strategies for Coasts - toolKIT
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/603458/EU
oaire.citation.endPage92
oaire.citation.startPage82
oaire.citation.titleEarth and Planetary Science Letters
oaire.citation.volume436
oaire.fundingStreamFP7
person.familyNameCostas
person.familyNameNaughton
person.givenNameSusana
person.givenNameFilipa
person.identifier1448818
person.identifierR-000-JPJ
person.identifier.ciencia-idAF19-9EEE-7550
person.identifier.ciencia-id1419-F239-1CEA
person.identifier.orcid0000-0002-4005-077X
person.identifier.orcid0000-0002-3055-9396
person.identifier.ridE-7659-2013
person.identifier.scopus-author-id9043656500
person.identifier.scopus-author-id23009659300
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
rcaap.rightsopenAccess
rcaap.typearticle
relation.isAuthorOfPublication62d73183-10ba-42ca-80a7-458c42d1375b
relation.isAuthorOfPublication53f17112-41aa-4bd9-a437-50736dbde6f9
relation.isAuthorOfPublication.latestForDiscovery53f17112-41aa-4bd9-a437-50736dbde6f9
relation.isProjectOfPublication32d71a50-4c49-45ec-a98d-dee9226309ca
relation.isProjectOfPublication.latestForDiscovery32d71a50-4c49-45ec-a98d-dee9226309ca

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