For years we’ve been led to believe that the planet Earth has been plagued by runaway Global Warming.  I’ve been waiting for this press release all weekend and it is GOLD!

PRESS RELEASE – July 29th, 2012 12PM PDT – FOR IMMEDIATE RELEASE

A reanalysis of U.S. surface station temperatures has been performed using the recently WMO-approved Siting Classification System devised by METEO-France’s Michel Leroy. The new siting classification more accurately characterizes the quality of the location in terms of monitoring long-term spatially representative surface temperature trends. The new analysis demonstrates that reported 1979-2008 U.S. temperature trends are spuriously doubled, with 92% of that over-estimation resulting from erroneous NOAA adjustments of well-sited stations upward. The paper is the first to use the updated siting system which addresses USHCN siting issues and data adjustments.

The new improved assessment, for the years 1979 to 2008, yields a trend of +0.155C per decade from the high quality sites, a +0.248 C per decade trend for poorly sited locations, and a trend of +0.309 C per decade after NOAA adjusts the data. This issue of station siting quality is expected to be an issue with respect to the monitoring of land surface temperature throughout the Global Historical Climate Network and in the BEST network.

Anthony Watts has been working on the Surface Stations project since 2007.  In a nutshell urban creep has impacted on the accuracy of the Surface Station temperature records across the globe.  The degree of accuracy has now been more accurately quantified.  This will send shockwaves through the global warming alarmist camp.

Using the new Leroy 2010 classification system on the older siting metadata used by Fall et al. (2011), Menne et al. (2010), and Muller et al. (2012), yields dramatically different results.

Using Leroy 2010 methods, the Watts et al 2012 paper, which studies several aspects of USHCN siting issues and data adjustments, concludes that:

These factors, combined with station siting issues, have led to a spurious doubling of U.S. mean temperature trends in the 30 year data period covered by the study from 1979 – 2008.

It’s all over at Watts Up With That where you can find the draft paper in PDF along with Power Point presentations, graphs and overview.  I’ll be updating this post later  with more information.

Joanne Nova sums it all up with this line:

“You don’t need a PhD to know that thermometers placed in car parks are not measuring global warming”

This new pre-print paper by Anthony Watts accomplishes so much. Assuming that no major problems are found, the pieces of the jigsaw fit and pass the common sense test. Yes, hot air rises off concrete.

  1. There goes half the warming trend. The most accurate thermometers in the right places are not recording high trends. High estimates come from combining good records with poor ones then adjusting that up.
  2. They show Mueller and BEST’s latest exaggerated claims of 1.5C are meaningless.
  3. They show that only class 1 and 2 stations (which are placed well, not next to concrete, car-parks, or air-conditioners) give reliable data and the warming trend from these stations is much lower than the warming trend from Class 3, 4 or 5 stations. It’s what we always knew — thermometers near artificial heat sources are measuring artificial warming, but it’s not the global kind.
  4. Mueller, BEST, GISS, Hadley and all the others should have removed the data from poor stations entirely. No amount of statistical chicanery can correct the artificial warming effect no matter how you adjust, blend, or homogenize the data.
  5. Worse, the adjusted data shows an even warmer trend than the warmest and worst stations. That casts a very dark shadow indeed. How honest or impartial are the scientists who adjust data from stations with thermometers near air-conditioners and create more warming? Bad stations have been adjusted up, instead of down, and then the good stations were adjusted up to match the now-really-awful-bad ones. The stench of failure and a lack of dedication to the truth in on show…
Read it all here