Sunday, April 27, 2008

1934 Warmest Year, Not 1998

I found a very odd foot note in an article. Why has this not been discussed in the media?
This is an "odd" oversight by Hansen et al. Or did McIntyr find yet more of the conveniently massaged data?

In August 2007 blogger Stephen McIntyr noticed that many U.S. temperature records from the Historical Climatology Network (USHCN) displayed a discontinuity around the year 2000. NASA corrected the mistaken data and reported that "data for 2000 and later years were inadvertently appended to USHCN data for prior years without including the adjustments at these stations that had been defined by the NOAA National Climate Data Center." The correction resulted in a slight (0.15 degree C) decrease in U.S. average temperatures post-2000, and 1934 replaced 1998 as the warmest year in the U.S. Note that the years have changed rankings before: in a 2001 paper 1934 was marginally warmer than 1998.

Recently it was realized that the monthly more-or-less-automatic updates of our global temperature analysis had a flaw in the U.S. data. We wish to thank Stephen McIntyre for bringing to our attention that this flaw might be present.

And NASA states:
Also our prior analysis had 1934 as the warmest year in the U.S. (see the 2001 paper above), and it continues to be the warmest year, both before and after the correction to post 2000 temperatures.

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