By H. Sterling Burnett
It is not just that the Earth has warmed less than biased temperature measurements indicate, it has also warmed less than climate models have said it should for the amount of CO2 humans have emitted into the atmosphere.
Climate Change Weekly has long detailed the severe problems with surface temperature records, driven largely by the Urban Heat Island (UHI) effect compromising the integrity of the vast majority of temperature stations.
In two studies for The Heartland Institute, meteorologist Anthony Watts detailed the extent to which the surface station record in the United States is compromised by station siting that violates the National Oceanic and Atmospheric Administration’s (NOAA) own standards for the proper, unbiased, siting of surface stations. Watts’ initial 2009 study found that 89 percent of the surface stations in NOAA’s and the National Weather Service’s (NWS) system were poorly sited and biased. After the study, NOAA/NWS closed some of the most severely compromised, ridiculously sited stations highlighted in report. Indeed, NOAA had already recognized the problem and had prior to the first study’s release established the U.S. Climate Reference Network (USCRN), consisting of 137 climate observing stations with the best equipment, existing in stable locations unlikely to ever be compromised by nearby development. At the same time, however, NOAA also added thousands of previously unregulated stations established and maintained by others to its system.
The larger system provides more comprehensive coverage, but the vast majority of the stations are, unsurprisingly, poorly sited. As a result, Watts’ follow up survey of NOAA’s surface station network found 96 percent of the stations used to determine U.S. average temperatures are biased upward due to poor siting. The UHI has compromised them.
How bad is the problem? As explained in an article in The Epoch Times, the U.S. Environmental Protection Agency has estimated that “daytime temperatures in urban areas are 1–7 degrees Fahrenheit higher than temperatures in outlying areas, and nighttime temperatures are about 2–5 degrees Fahrenheit higher.” Whereas the temperature record from the USCRN indicates little or no temperature change during its 18 years of existence, the broader network supports claims that the U.S. is warming. By the way, as detailed in previous Climate Change Weekly posts, what’s true for the United States is also true for the global surface station network and, since 2015, for the ocean temperature measurement system. Both are biased by poor siting compromising the validity of the temperatures measured.
A new report from the Heritage Foundation by Roy Spencer, Ph.D., a long-time friend of The Heartland Institute, principal research scientist at the University of Alabama in Huntsville, and currently a visiting fellow in The Heritage Foundation’s Center for Energy, Climate, and Environment, looks at a slightly different problem with temperatures: the difference between measured warming and climate model temperature projections. It is not just that the Earth has warmed less than biased temperature measurements indicate, it has also warmed less than climate models have said it should for the amount of CO2 humans have emitted into the atmosphere.
Spencer’s research found recent warming is likely not due solely to human greenhouse gas emissions, and the warming experienced is substantially less than climate models have predicted—43 percent less, in fact. And that’s even when readings from the UHI-biased stations are included.
Spencer examined summertime temperature readings for 12 Corn Belt states in the United States. Each of the 36 models he compared to measured warming by surface stations, weather balloons, and global satellites overstated the amount of warming experienced, with most of the models off by 100 percent or more. (See the graphic, below)
Spencer is also working on a large-scale study to explain the discrepancy between urban and rural temperature stations globally, and how that plays into recent claims temperatures are setting all-time records. His preliminary data suggests measured warming is strongly correlated to population density. As cities grow, and populations increase and become more densely packed, temperatures in urban and suburban areas rise faster than in the surrounding countryside, once again confirming Watts’ conclusion that the temperature record is compromised by UHI.
If Watts’ and Spencer’s research are correct, not only do climate models “run too hot,” as even some of their proponents have been forced to admit, but the regularly reported surface station record is running too hot as well.
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