Impact of iceberg melting on Mediterranean thermohalinecirculation during Heinrich events

En este art?culo se reconocen varios eventos que ponen en evidencia la entrada en el Mediterr?neo de agua procedente de la fusi?n de icebergs en el ?ltimo per?odo glacial y se analiza el impacto de dichos eventos en la circulaci?n profunda del Mediterr?neo Down-core samples of planktonic and benthic...

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Bibliographic Details
Main Authors: Sierro S?nchez, Francisco Javier, Hodell, David A., Curtis, Jason H., Flores Villarejo, Jos? Abel, Reguera Garc?a, Mar?a Isabel, Colmenero Hidalgo, Elena, B?rcena Pern?a, Mar?a ?ngeles, Grimalt, Joan O., Cacho Lascorz, Isabel, Frigola Ferrer, Jaime, Canals, Miquel
Format: Article in Journal/Newspaper
Language:unknown
English
Published: American Geophysical Union (Washington, Estados Unidos) 2005
Subjects:
Paleoceanograf?a
Cambio clim?tico
Circulaci?n oce?nica
Mediterr?neo
Paleoceanography
Climatic changes
Ocean circulation
Mediterranean Sea
Entrada
North Atlantic
Online Access:http://hdl.handle.net/10366/19412
Description
Summary:En este art?culo se reconocen varios eventos que ponen en evidencia la entrada en el Mediterr?neo de agua procedente de la fusi?n de icebergs en el ?ltimo per?odo glacial y se analiza el impacto de dichos eventos en la circulaci?n profunda del Mediterr?neo Down-core samples of planktonic and benthic foraminifera were analyzed for oxygen and carbon isotopesin International Marine Past Global Changes Study (IMAGES) core MD99-2343 in order to study theinteractions between climate change in the Northern Hemisphere and the western Mediterranean thermohalinecirculation at times of Heinrich events (HE). Our results confirm the antiphase correlation between enhancedNorth Atlantic Deep Water formation and low ventilation in the Mediterranean. However, this study reveals thatthis antiphase relationship in deepwater formation between the North Atlantic and Mediterranean wasinterrupted during times of HE when the injection of large volumes of water from melting icebergs reached theentrance to the Mediterranean. These events, which lasted less than 1000 years, are represented by pronounceddecreases in both planktonic d18O and benthic d13C signals. Lower salinities of Mediterranean surface waterresulted in a slowdown of western Mediterranean deepwater overturn even though cold sea surface temperaturesand drier climate should have resulted in enhanced deepwater formation.

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