Oceanography: Slowing Nature's Sea Pump

From: The Washington Post | Date: March 11, 1991| Author: | Copyright information

One of the oceans' natural pumps - it made cold water near Greenland sink to the depths and pulled warmer water north - suddenly and mysteriously switched off in the 1980s, according to scientists at Columbia University.

Under normal conditions, cold and salty (and therefore heavy) water at the surface of the Greenland Sea sinks. The surface waters are replaced by warmer, less salty surface water flowing from the south.

This natural pump is part of a larger, more complex "conveyer belt" that has warmed Europe and the British Isles.

By tracking radioactive tritium in the water, Peter ...

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