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A First Look at “Possible Artifacts of Data Biases in the Recent Global Surface Warming Hiatus”

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Several different data sets show that there has been a hiatus in global warming since the late 1990s despite continuing increases in carbon dioxide concentrations in the atmosphere. Dr. McKitrick reviews a paper Karl et al 2015 that revises the global sea surface temperature (SST) trend since 1998 upward by 0.06 C/decade. McKitrick reviews the many problems with SST data from ships and buoys. The authors add 0.12 C to the buoys data, which represent a rising fraction of observations over recent decades, but other groups use region-specific adjustments. They also adjust the ship records in the years 1998-2000. Other teams have gone into great detail to look at available metadata for each measurement type and have made corrections based on the specific systems and sites involved.



Version 6.0 of the UAH Temperature Dataset Released

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The University of Alabama in Huntsville (UAH) released version 6 of its global satellite temperature product, the result of three years of work. This article by Dr. Roy Spencer, Dr. John Christy and Dr. William Bradwell, describes the major changes in processng strategy and the the results of the work. Version 6 is by far the most extensive revision of the procedures and computer code ever produced in over 25 years. The two most significant changes are a decrease in the global-average lower tropospheric (LT) temperature trend from Dec. 1978 through Mar. 2015 of 0.026 C/decade; and the geographic distribution of the LT trends, including higher spatial resolution. The UAH trend from Jan. 2002 decreased from +0.057 C/decade (ver.5.6) to -0.029 C/decade (ver.6.0), or a change of -0.086 C/decade. The RSS trend for the same period is -0.049 C/decade.



Temperature Adjustments Transform Arctic Climate History

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The Arctic warmed up rapidly during the 1930’s and 40’s, before temperatures plunged in the 1960’s and 70’s. The GISS Arctic temperature record has been "adjusted" by cooling past readings so that the current adjusted records are about a degree Celsius warmer than the 1940s. Nearly every current station from Greenland, in the west, to the heart of Siberia (87E), in the east, has been altered by cooling past temperatures. The effect has been to remove a large part of the 1940’s spike, and as consequence removed much of the drop in temperatures during the subsequent cold decades. The evidence suggests that the official temperature trends for the Arctic, as published by GISS and others, are hopelessly flawed.



The Global Warming Standstill

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A report by Dr David Whitehouse and published by the Global Warming Policy Foundation concludes that there has been no statistically significant increase in annual global temperatures since 1997. The report discusses the reporting of the standstill from 2006 to date. It shows the standstill can not be explained as a random aberration. The CO2 concentration has increased from 365 to 395 during the period.



NOAA Temperature Fraud Expands

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As of 1999, NASA showed that 1934 was more than one degree (Fahrenheit) warmer than 1998, and that 1921, 1931 and 1953 were all warmer than 1998. They now show that 1934 is about 0.1 C or 0.2 F cooler than 1998. The total recent downwards adjustment of 1934 is almost 1.3 degrees Fahrenheit relative to 1998. NOAA is claiming that the Continental US 2012 temperature was a record, but prior to recent adjustments, 1934 was hotter than 2012.



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