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New evidence for man-made global warming
Findings suggest troposphere warming at about two-tenths of a degree Celsius per decade

INS news (6 July 2004) - For years the debate about climate change has had a contentious sticking point - satellite measurements of temperatures in the troposphere, the layer of atmosphere where most weather occurs, were inconsistent with fast-warming surface temperatures.

But a team led by a University of Washington atmospheric scientist has used satellite data in a new and more accurate way to show that, for more than two decades, the troposphere has actually been warming faster than the surface. The new approach relies on information that better separates readings of the troposphere from those of another atmospheric layer above, which have disguised the true troposphere temperature trend.

"This tells us very clearly what the lower atmosphere temperature trend is, and the trend is very similar to what is happening at the surface," said Qiang Fu, a UW associate professor of atmospheric sciences.

He is lead author of a paper documenting the work published in the May 6 edition of the journal Nature. Co-authors are Celeste Johanson, a UW research assistant and graduate student in atmospheric sciences; Stephen Warren, a UW professor of atmospheric sciences and Earth and space sciences; and Dian Seidel, a research meteorologist with the National Oceanic and Atmospheric Administration's Air Resources Laboratory in Silver Spring, Md.

The team examined measurements from devices called microwave-sounding units on NOAA satellites from January 1979 through December 2001. The satellites all used similar equipment and techniques to measure microwave radiation emitted by oxygen in the atmosphere and determine its temperature....

Read full article at http://www.virtueel.com/upd/ins_headlines.rxml?cust=2&id=585

Source: University of Washington

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