RT Journal Article
T1 Respuesta de los Cocolitofóridos a los cambios atmosféricos y oceanográficos durante el Periodo Húmedo Africano del Holoceno en el Atlántico
T1 Response of Coccolithophores to atmospheric and oceanographic changes during the Holocene African HumidPeriod in the Atlantic
A1 Mejía Molina, Alejandra
A1 Flores, José Abel
A1 Bárcena, María Ángeles
A1 Sierro, Francisco Javier
A1 Grousset, F.
AB Core MD03 2705 was recovered at 18ºN-21ºW at a water depth of 3100 m off Mauritania-Senegal (NWAfrica) during the Marion Dufresne II Cruise PICABIA. Qualitative analyses carried out in coccolithophoresand 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 surfacewater dynamics during the Holocene African Humid Period (AHP) (9-5.5 ka). The terrigenous recordexhibits a well-defined period of low influx associated with the AHP, when the Sahara was near completelyvegetated and covered by perennial lakes. Variations in the production of coccolithophores, showing highproductivity during the wet conditions, were monitored. A rapid shift to arid conditions at the end of theAHP coincides with higher abundance in fresh-water diatoms and phytholiths, as well as a positive pulsein the Ti/Al ratio, suggesting intensification in the wind regime. At this time, coccolithophores show adramatic decreasing of the cool-water species Gephyrocapsa muellerae, interpreted as a return to warmerconditions
PB Sociedad Geológica de España
YR 2005
FD 2005
LK http://hdl.handle.net/10272/8681
UL http://hdl.handle.net/10272/8681
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026