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Studies of the Santa Barbara Basin off the coast of California have linked changes in its bottom-water oxygen content to millennial-scale climate changes as recorded by the oxygen isotope composition of Greenland ice. Through the use of detailed records from a sediment core collected off the Magdalena Margin of Baja California, Mexico, we dem- onstrate that this teleconnection predominantly arose from changes in marine productiv- ity, rather than changes in ventilation of the North Pacific, as was originally proposed. One possible interpretation is that the modern balance of El Nino-La Nina conditions that favors a shallow nutricline and high productivity today and during warm climate intervals of the past 52 k.y. was altered toward more frequent, deep nutricline, low pro- ductivity, El Nino-like conditions during cool climate intervals.

Enhanced marine productivity off western North America during warm climate intervals of the past 52 k.y.