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Tuesday, December 22, 2009 12:56:27 PM
Thomas Sowell mixes fact and fiction in his latest harebrained letter, conjuring visions of greedy agenda driven scientists furiously shredding data documents.
99% of all land and sea based temperature data is stored in the Global Historical Climatology Network (GHCN) database of temperature, precipitation and pressure records managed by the National Climatic Data Center, Arizona State University and the Carbon Dioxide Information Analysis Center. The raw data can be accessed by any scientist (or you or I).
Satellite data is stored by NASA and is also available.
I think it was about 15 years ago that Michael Mann published the first "Hockey Stick" chart which showed the Earth was warming at an accelerated rate corresponding to man's increased use of fossil fuels.
As with all good science, his research was published so it could be peer reviewed and proven or dis-proven. Two Canadians, Steve McIntyre, a retired petro-geologist and an economist, McKitrick, found that Mann's research was flawed due to incomplete data he'd used.
The problem with the Hockey Stick was not it's conclusion but that it didn't show the European middle ages warm period.
When the error was pointed out, Mann corrected his chart and again published his research.
Here's the original Hockey Stick -
And this is the reconstructed Hockey Stick
McIntyre and McKitrick have expressed no problems with this chart. It does show the Little Ice Age and the Medieval Warm Period very clearly and more importantly, it shows our own warming trend just as the original Hockey Stick showed!
In the 10 years(?) since Mann first published the flawed Hockey Stick chart there have been dozens of studies, some by the same team or involving some of its members, some by completely different people, some using tree rings, some using corals, some using stalagmites, some using borehole measurements. All support the same conclusion....
The general conclusion is:
http://www.ncdc.noaa.gov/paleo/globalwarming/paleolast.html
"Although each of the temperature reconstructions are different (due to differing calibration methods and data used), they all show some similar patterns of temperature change over the last several centuries. Most striking is the fact that each record reveals that the 20th century is the warmest of the entire record, and that warming was most dramatic after 1920."
99% of all land and sea based temperature data is stored in the Global Historical Climatology Network (GHCN) database of temperature, precipitation and pressure records managed by the National Climatic Data Center, Arizona State University and the Carbon Dioxide Information Analysis Center. The raw data can be accessed by any scientist (or you or I).
Satellite data is stored by NASA and is also available.
I think it was about 15 years ago that Michael Mann published the first "Hockey Stick" chart which showed the Earth was warming at an accelerated rate corresponding to man's increased use of fossil fuels.
As with all good science, his research was published so it could be peer reviewed and proven or dis-proven. Two Canadians, Steve McIntyre, a retired petro-geologist and an economist, McKitrick, found that Mann's research was flawed due to incomplete data he'd used.
The problem with the Hockey Stick was not it's conclusion but that it didn't show the European middle ages warm period.
When the error was pointed out, Mann corrected his chart and again published his research.
Here's the original Hockey Stick -
And this is the reconstructed Hockey Stick
McIntyre and McKitrick have expressed no problems with this chart. It does show the Little Ice Age and the Medieval Warm Period very clearly and more importantly, it shows our own warming trend just as the original Hockey Stick showed!
In the 10 years(?) since Mann first published the flawed Hockey Stick chart there have been dozens of studies, some by the same team or involving some of its members, some by completely different people, some using tree rings, some using corals, some using stalagmites, some using borehole measurements. All support the same conclusion....
The general conclusion is:
http://www.ncdc.noaa.gov/paleo/globalwarming/paleolast.html
"Although each of the temperature reconstructions are different (due to differing calibration methods and data used), they all show some similar patterns of temperature change over the last several centuries. Most striking is the fact that each record reveals that the 20th century is the warmest of the entire record, and that warming was most dramatic after 1920."
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