Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/18334
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dc.contributor.authorRomero, Oscar E.-
dc.contributor.authorKim, Jung-Hyun-
dc.contributor.authorDonner, Barbara-
dc.date.accessioned2009-11-05T11:30:55Z-
dc.date.available2009-11-05T11:30:55Z-
dc.date.issued2008-09-12-
dc.identifier.citationPaleoceanography 23: 3218 (2008)en_US
dc.identifier.issn0883-8305-
dc.identifier.urihttp://hdl.handle.net/10261/18334-
dc.description.abstractThe low-latitude upwelling regime off the Mauritanian coast in the subtropical NE Atlantic accounts for a significant part of global export production. Although productivity variations in coastal upwelling areas are usually attributed to changes in wind stress and upwelling intensity, productivity dynamics off Mauritania are less straightforward because of the complex atmospheric and hydrographic setting. Here we integrate micropaleontological (diatoms) and geochemical (bulk biogenic sediment components, X-ray fluorescence, and alkenones) proxies to examine on submillennial-to-millennial changes in diatom production that occurred off Mauritania, NW Africa, for the last 25 ka. During the Last Glacial Maximum (LGM, 19.0–23.0 ka B.P.), moderate silicate content of upwelled waters coupled with weakened NE trade winds determined moderate diatom productivity. No significant cooling is observed during the LGM, suggesting that our alkenone-based SST reconstruction represents a local, upwelling-related signal rather than a global insolation related one. Extraordinary increases in diatom and opal concentrations during Heinrich event 1 (H1, 15.5–18.0 ka B.P.) and the Younger Dryas (YD, 13.5–11.5 ka B.P.) are attributed to enhanced upwelling of silica-rich waters and an enlarged upwelling filament, due to more intense NE trade winds. The synchronous increase of CaCO3 and K intensity and the decreased opal and diatoms values mark the occurrence of the Bølling/Allerød (BA, 13.5–15.5 ka B.P.) due to weakened eolian input and more humid conditions on land. Although the high export of diatoms is inextricably linked to upwelling intensity off Mauritania, variability in the nutrient content of the thermocline also plays a decisive role.en_US
dc.format.extent10752 bytes-
dc.format.mimetypeapplication/octet-stream-
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.rightsclosedAccessen_US
dc.subjectRapid climate changeen_US
dc.subjectGeochemical tracersen_US
dc.subjectMicropaleontologyen_US
dc.subjectSea surface temperatureen_US
dc.subjectUpwellingen_US
dc.titleSubmillennial-to-millennial variability of diatom production off Mauritania, NW Africa, during the last glacial cycle.en_US
dc.typeartículoen_US
dc.identifier.doi10.1029/2008PA001601-
dc.description.peerreviewedPeer revieweden_US
dc.relation.publisherversionhttp://dx.doi.org/10.1029/2008PA001601en_US
dc.type.coarhttp://purl.org/coar/resource_type/c_6501es_ES
item.openairetypeartículo-
item.fulltextNo Fulltext-
item.grantfulltextnone-
item.languageiso639-1en-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.cerifentitytypePublications-
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