Global warming heats up nursery of hurricanes.
Between June and October 2005, the average sea-surface temperature in the region between Africa and the Caribbean where such storms typically form was 0.92[degrees]C above the average recorded there between 1901 and 1970. That 70-year period predates a recent surge in temperatures worldwide, report Trenberth and Dennis J. Shea, also of the center.
By analyzing oceanographic data gathered around the world, Trenberth and Shea estimate that less than 0.1[degrees]C of last year's North Atlantic temperature anomaly resulted from long-term variations in a regional climate cycle called the Atlantic Multidecadal Oscillation. About 0.2[degrees]C stems from the aftereffects of an El Nino.
About 0.45[degrees]C comes from climate changes that boosted sea-surface temperatures worldwide. The remainder of the anomalous warmth, around 0.2[degrees]C, reflects normal year-to-year variation in weather, Trenberth and Shea report in the June 28 Geophysical Research Letters.--S.P.
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|Article Type:||Brief article|
|Date:||Jul 22, 2006|
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