Paleo-oceanography

A scanning electron microscope image of the benthic foraminifer Uvigerina peregrina, one of the species used in this study. The specimen was found in sediments that accumulated about 21,000 years ago in water depths of about 3 km off the coast of North Carolina. Credit Jack Wharton and Mark Stanley

Deep currents in the Atlantic Ocean continued to operate during the last ice age.

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A study in Nature suggests that a critical flow system did not completely collapse under extreme conditions, sharpening the debate about transition thresholds today.
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