Quote of the Week: That time when climate science believed UHI was causing most of the twentieth century warming

AMS fellow Joe D’Aleo writes of a time when Thomas Karl, former director of the National Climatic Data Center (NCDC) actually believed that UHI and station siting was a problem that created a warm bias. He writes: Tom Karl whose paper in 1988 defined the UHI adjustment for the first version of USHCN (which was…

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USHCN Monthly Temperature Adjustments

Guest Essay By Walter Dnes There have been a number of posts on USHCN temperature adjustments, including 1, 2, 3, 4, 5 and 6. They have focused primarily on annual adjustments. Whilst looking into the USHCN adjustments, I noticed that each of the 12 months is adjusted differently. Here is a plot of average USHCN temperature adjustments, for each month…

NCDC's new USHCN hockey stick trick

Yesterday, NCDC released Version 2.5 of the USHCN data set. For those who don’t know, this is the U.S. Historical Climatology Network (USHCN) which NCDC considers a “gold standard” for US temperature measurements. Problem is, the reality of the old network is that it is fraught with all sort of inconsistencies throughout its record such…

Watts et al paper 2nd discussion thread

The first press release announcement thread is getting big and unwieldy, and some commenters can’t finish loading the thread, so I’m providing this one with some updates. 1. Thanks to everyone who has provided widespread review of our draft paper. There have been hundreds of suggestions and corrections, and for that I am very grateful. …

New paper on the quality of USHCN station siting

Dr. Roger Pielke Sr. draws attention today to a new study that cites Fall et al. 2011 aka the “Surfacestations Paper” that I co-authored, which was a follow up to my original surveys published in Watts 2009. The new paper is: Martinez, C.J., Maleski, J.J., Miller, M.F, 2012: Trends in precipitation and temperature in Florida,…

Warming in the USHCN is mainly an artifact of adjustments

Dr. Roy Spencer proves what we have been saying for years, the USHCN (U.S. Historical Climatology Network) is a mess compounded by a bigger mess of adjustments. ============================================================== USHCN Surface Temperatures, 1973-2012: Dramatic Warming Adjustments, Noisy Trends Guest post by Dr. Roy Spencer PhD. Since NOAA encourages the use the USHCN station network as the…