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Supreme Court shuts out environmentalists
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No DNA link between Etruscans, Tuscans
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Butterfly offers lessons in climate change
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Study looks at tropical instability waves
COLLAGE STATION, Texas, May 21 (UPI) --
U.S. atmospheric scientists have determined trade winds drive upwelling along the equator, bringing cold water to the oceans' surface. In the Pacific and Atlantic oceans, temperature fronts oscillate between deep, cold equatorial water and warmer surface water nearer to the poles. Such tropical instability waves, or TIWs, propagate westward in both basins. Now, using satellite data, Qiaoyan Wu and Kenneth Bowman of Texas A&M University have examined how those waves interact with year-to-year variations of sea-surface temperature. Based on eight years of data from the Tropical Rainfall Measuring Mission satellite, they found the sea-surface-temperature effect of TIWs in the Pacific Ocean is weakest when El Nino warms eastern Pacific waters and strongest when the El Nino Southern Oscillation cycle cools those waters. Similar patterns occur in the Atlantic. The researchers say such variations in sea-surface temperature might produce corresponding variations in the regional atmosphere. The study is reported in the journal Geophysical Research Letters.
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