Four climate cycles of recurring deep and surface water destabilizations on the Iberian margin
Options
BORIS DOI
Date of Publication
2007
Publication Type
Article
Division/Institute
Author
Martrat, Belen | |
Grimalt, Joan O. | |
Shackleton, Nicholas J. | |
de Abreu, Lucia |
Series
Science
ISSN or ISBN (if monograph)
0036-8075
Publisher
American Association for the Advancement of Science
Language
English
Publisher DOI
Description
Centennial climate variability over the last ice age exhibits clear bipolar behavior. High-resolution analyses of marine sediment cores from the Iberian margin trace a number of associated changes simultaneously. Proxies of sea surface temperature and water mass distribution, as well as relative biomarker content, demonstrate that this typical north-south coupling was pervasive for the cold phases of climate during the past 420,000 years. Cold episodes after relatively warm and largely ice-free periods occurred when the predominance of deep water formation changed from northern to southern sources. These results reinforce the connection between rapid climate changes at Mediterranean latitudes and century-to-millennial variability in northern and southern polar regions.