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Politics : View from the Center and Left
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To: epicure who wrote (19725)5/27/2006 12:18:00 AM
From: epicure  Read Replies (1) of 542784
 
Satellite and Surface Temperature Records Reconciled
C.A. Mears and F.J. Wentz, Science
(August 11, 2005)
A. Revkin, "Errors Cited in Assessing Climate Data," New York Times
(August 12, 2005)

A puzzling discrepancy among different approaches to measuring global warming was resolved when scientists discovered an error in previous calculations used to correct satellite temperature readings. Global warming naysayers had long pointed to satellite-based temperature measurements published by two scientists at the University of Alabama as evidence that there was great uncertainty about global warming. These measurements appeared to show that the earth's atmosphere was warming far more slowly than the earth's surface, contrary to the expectations of climate scientists and the predictions of climate models used to forecast the effects of increases in heat-trapping pollution. Scientists at Remote Sensing Systems reanalyzed the raw satellite data and found that the lower atmosphere is actually warming slightly faster than the surface, in agreement with theory and models. These scientists found that the previous analysis of the satellite data had inaccurately corrected for changes in the satellites' measurement time resulting from the decay of their orbit. The diurnal temperature cycle of warmer temperatures during the day and cooler temperatures at night means that a gradual change in measurement time introduces a spurious temperature trend that must be removed from the data. The University of Alabama scientists have now acknowledged that they made a mistake and have adjusted their data series, making it much more in line with other results.
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