"Adjusted" Alaska data trend over 2 degrees warmer than raw data


“I recently completed a study of central Alaska’s climate. For this study I computed the average annual temperature for nine long-term Alaskan stations (and station combinations), which are: Eagle/Dawson, Ft. Yukon/Central, Fairbanks University, McKinley Park, Talkeetna, Gulkana / Kennecott / Chitina / McCarthy, Yakutat, Cordova, and Valdez. Then I averaged the nine stations for a regional mean ([upper graph], enlarged here). The data source was NCDC. …

Next is a graph [lower graph] of the GHCN [Global Historical Climate Network] annual temperatures for the same region. The GHCN data is dominated by an upward trend. My analysis gives an upward linear trend of 0.69 C/century (due to starting during a cold PDO and ending during a warm PDO), while the GHCN trend is 2.83 C/century – over 2 degrees larger!

My study and the GHCN use the same stations, because there are no other long-term stations in the regions. I applied no “corrections” beyond offsets used when combining two or more stations with overlapping records (no other adjustments were warranted). One can only guess what “corrections” were applied to the GHCN and IPCC data sets, but I can easily guess their magnitude – about 1 degree. Curiously, the magnitude of the adjustments is about the same as the “global warming” signal of the past century. ” “Alaska Climate – Station Data vs Adjusted GHCN/IPCC” h/t Icecap, December 5

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