from Dailycaller Website
Global warming has not accelerated temperature rise in the bulk atmosphere in more than two decades, according to a new study funded by the Department of Energy.
University of Alabama-Huntsville climate scientists John Christy and Richard McNider found (Satellite Bulk Tropospheric Temperatures as a Metric for Climate Sensitivity) that by removing the climate effects of volcanic eruptions early on in the satellite temperature record it showed virtually no change in the rate of warming since the early 1990s.
Christy and McNider found the rate of warming has been 0.096 degrees Celsius per decade after,
The study is sure to be contentious.
Christy has argued for years that climate models exaggerate global warming in the bulk atmosphere, which satellites have monitored since the late 1970s.
Christy, a noted skeptic of catastrophic man-made global warming, said his results reinforce his claim that climate models predict too much warming in the troposphere, the lowest five miles of the atmosphere.
Models are too sensitive to increases in carbon dioxide concentrations in the atmosphere, he said.
While many scientists have acknowledged the mismatch between model predictions and actual temperature observations, few have really challenged the validity of the models themselves.
A recent study (Causes of Differences in Model and Satellite Tropospheric Warming Rates) led by Lawrence Livermore National Laboratory climate scientist Ben Santer found that while the models ran hot, the "overestimation" was,
Christy's removal of volcanic-driven cooling from satellite temperature data could also draw scrutiny.
The study also removed El Niño and La Niña cycles, which are particularly pronounced in satellite records, but those cycles largely canceled each other out, the co-authors said.
Christy said his works shows the,
Two major volcanoes - El Chichón in 1982 and Pinatubo in 1991 - caused global average temperature to dip as a result of volcanic ash, soot and debris reflecting sunlight back into space.
Those eruptions meant there was more subsequent warming in the following years, making the rate of warming appear to be rising as a result of man-made emissions or other factors, Christy said.
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