Abrupt Temperature Changes in the Western Mediterranean over the Past 250,000 Years

Author:

Martrat Belen1234,Grimalt Joan O.1234,Lopez-Martinez Constancia1234,Cacho Isabel1234,Sierro Francisco J.1234,Flores Jose Abel1234,Zahn Rainer1234,Canals Miquel1234,Curtis Jason H.1234,Hodell David A.1234

Affiliation:

1. Department of Environmental Chemistry Institut d'Investigacions Quimiques i Ambientals de Barcelona–Consell Superior d'Investigacions Cientifiques (CSIC), 08034-Barcelona, Spain.

2. Department of Stratigraphy, Paleontology, and Marine Geosciences, University of Barcelona, 08028-Barcelona, Spain.

3. Department of Geology, University of Salamanca, 37008-Salamanca, Spain.

4. Department of Geological Sciences, University of Florida, Gainesville, FL 32611–2120, USA.

Abstract

A continuous high-resolution Western Mediterranean sea surface temperature (SST) alkenone record spanning the past 250,000 years shows that abrupt changes were more common at warming than at cooling. During marine isotope stage (MIS) 6, SST oscillated following a stadial-interstadial pattern but at lower intensities and rates of change than in the Dansgaard/Oeschger events of MIS 3. Some of the most prominent events occurred over MISs 5 and 7, after prolonged warm periods of high stability. Climate during the whole period was predominantly maintained in interglacial-interstadial conditions, whereas the duration of stadials was much shorter.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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