Saturday, March 21st 2009, 1:56 PM EDT
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THERE are 3,000 free-drifting buoys in the world’s ocean; first deployed in the year 2000 they allow continuous monitoring of the temperature, salinity, and velocity of the upper ocean. There has though been some difficulty in interpreting the data from these buoys. Initial signs of cooling were dismissed as due to technical errors subsequently corrected based on a small sample of the 3,000 buoys known as profiling floats.