Four climate cycles of recurring deep and surface water destabilizations on the Iberian margin

Martrat, Belen; Grimalt, Joan O.; Shackleton, Nicholas J.; de Abreu, Lucia; Hutterli, Manuel A.; Stocker, Thomas F. (2007). Four climate cycles of recurring deep and surface water destabilizations on the Iberian margin. Science, 317(5837), pp. 502-507. Washington, D.C.: American Association for the Advancement of Science 10.1126/science.1139994

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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.

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