Cadmium concentrations at different depths in the North Atlantic over the past 24,000 years, inferred from measurements on benthic foraminifera. Top: from a core at 4,450 meters' depth; bottom: from a core at 965 meters. High cadmium concentrations imply sluggish circulation. Note that the circulation of North Atlantic Deep Water (NADW) strengthens during the course of deglaciation, while the circulation of Glacial North Atlantic Intermediate Water (GNAIW) weakens, with a reversal of these trends during the Younger Dryas cold period.
Source: Thomas M. Marchitto, Jr., William B. Curry, and Delia W. Oppo, "Millennial-Scale Changes in North Atlantic Circulation Since the Last Glaciation," Nature Vol. 393 (June 11, 1998), pp. 557-561.
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Last modified by pib on October 28, 2003.