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Deep Pacific waters warmed in recent years

Oceanographic data gathered across the North Pacific in 1985 and again in 1999 indicate that the deepest waters there have been heating up.

In trans-Pacific research cruises, scientists measured the ocean's temperature, salinity, and other properties at more than 100 sites along latitude 47°N. That route stretches from Russia's Kuril Islands to the coast of Washington State, says Howard Freeland of the Institute of Ocean Sciences in Sidney, British Columbia.

A comparison of the two data sets showed that the average temperature of the water at depths below 5,000 meters was about 0.005°C warmer in 1999 than it was in 1985. Instruments on both cruises could measure temperatures accurately within 0.001°C, so the temperature increase—which was noted at points all across the ocean basin—almost certainly is real, says Freeland. He and his colleagues report their findings in the Feb. 26 Nature.

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