I’ll have a lot more on this study later, but for now just a short rebuttal.
I believe this study is hopelessly flawed due to the fact that the authors take the data from the weather stations at face value without considering bias due to measurement error or siting error, both of which are rampant in the US surface station network.
Read the report.
While not all situations with poorly sited weather stations affect trends, a weather station like this one at the University of Arizona’s parking lot in front of the atmospheric science department is represenative of the kinds of problems that would lead to an increased number of new high temperature records set
Above: official USHCN weather station, in the parking lot, Atmospheric Science Dept. University of Arizona, Tucson. Photo: Warren Meyer
Plus then there’s the error problem. For example we saw this summer that Honolulu set new record highs, but they turned out to be in error. The kicker is that NOAA let the records stand anyway! The problem is that a number of climate stations are at airports. Watch this NWS employee say on record that these airport weather stations are “placed for aviation purposes…not necessarily for climate purposes.”
So take this NCAR study with a grain of salt, since the authors did not address any of these issues.
From NCAR: Record High Temperatures Far Outpace Record Lows Across U.S.
BOULDER—Spurred by a warming climate, daily record high temperatures occurred twice as often as record lows over the last decade across the continental United States, new research shows. The ratio of record highs to lows is likely to increase dramatically in coming decades if emissions of greenhouse gases continue to climb.
“Climate change is making itself felt in terms of day-to-day weather in the United States,” says Gerald Meehl, the lead author and a senior scientist at the National Center for Atmospheric Research (NCAR). “The ways these records are being broken show how our climate is already shifting.”...
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