PRESS RELEASE – U.S. Temperature trends show a spurious doubling due to NOAA station siting problems and post measurement adjustments.
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 ( United States Historical Climatolgy Network ) siting issues and data adjustments.