"Surface temperatures recorded over three decades at 410 ideally situated weather stations are markedly lower than temperatures recorded at stations located near multiple heatsinks, according to a new study presented Thursday at the 2015 fall meeting of the American Geophysical Union in San Francisco.The study examined the 30-year temperature records collected from a subset of 410 weather stations belonging to the National Oceanographic and Atmospheric Administration’s (NOAA) Historical Climatology Network (USHCN) of 1,218 stations.
...“The majority of weather stations used by NOAA to detect climate change temperature signal have been compromised by encroachment of artificial surfaces like concrete, asphalt, and heat sources like air conditioner exhausts.
This study demonstrates conclusively that this issue affects temperature trend and that NOAA’s methods are not correcting for this problem, resulting in an inflated temperature trend,” said lead author Anthony Watts, who blogs at Watts Up With That?
...The worst (Class 5) have their “temperature sensor located next to/above an artificial heating source, such as a building, roof top, parking lot, or concrete surface.”
“The poorest sites tend to be warmer,” explained co-author John Nielsen-Gammon, professor of atmospheric sciences at Texas A&M University."
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