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Response of Coccolithophores to atmospheric and oceanographic changes during the Holocene African Humid Period in the Atlantic

dc.contributor.authorMejía Molina, Alejandra
dc.contributor.authorFlores, José Abel
dc.contributor.authorBárcena, María Ángeles
dc.contributor.authorSierro, Francisco Javier
dc.contributor.authorGrousset, F.
dc.date.accessioned2014-08-01T10:07:16Z
dc.date.available2014-08-01T10:07:16Z
dc.date.issued2005
dc.identifier.urihttp://hdl.handle.net/10272/8681
dc.description.abstractCore MD03 2705 was recovered at 18ºN-21ºW at a water depth of 3100 m off Mauritania-Senegal (NW Africa) during the Marion Dufresne II Cruise PICABIA. Qualitative analyses carried out in coccolithophores and wind-transported microfossils from continental NW African areas (phytholiths and fresh-water diatoms), allow us to interpret variations in the direction and intensity of winds and their relationship with surface water dynamics during the Holocene African Humid Period (AHP) (9-5.5 ka). The terrigenous record exhibits a well-defined period of low influx associated with the AHP, when the Sahara was near completely vegetated and covered by perennial lakes. Variations in the production of coccolithophores, showing high productivity during the wet conditions, were monitored. A rapid shift to arid conditions at the end of the AHP coincides with higher abundance in fresh-water diatoms and phytholiths, as well as a positive pulse in the Ti/Al ratio, suggesting intensification in the wind regime. At this time, coccolithophores show a dramatic decreasing of the cool-water species Gephyrocapsa muellerae, interpreted as a return to warmer conditionsen_US
dc.language.isospaen_US
dc.publisherSociedad Geológica de Españaen_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.otherAtlantic Oceanen_US
dc.subject.otherNorthwest Africaen_US
dc.subject.otherHoloceneen_US
dc.subject.otherAfrican Humid Perioden_US
dc.subject.otherCoccolithophoresen_US
dc.subject.otherPaleoceanographyen_US
dc.titleRespuesta de los Cocolitofóridos a los cambios atmosféricos y oceanográficos durante el Periodo Húmedo Africano del Holoceno en el Atlánticoen_US
dc.titleResponse of Coccolithophores to atmospheric and oceanographic changes during the Holocene African Humid Period in the Atlanticeng
dc.typeinfo:eu-repo/semantics/articleen_US
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessen_US


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