Title | Four Climate Cycles of Recurring Deep and Surface Water Destabilizations on the Iberian Margin |
Publication Type | Journal Article |
Year of Publication | 2007 |
Authors | Martrat, B, Grimalt, JO, Shackleton, NJ, de Abreu, L, Hutterli, MA, Stocker, TF |
Journal | Science |
Volume | 317 |
Pagination | 502-507 |
Date Published | July 27, 2007 |
Abstract | 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. |
URL | http://www.sciencemag.org/content/317/5837/502.abstract |
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