Monthly Archives: December 2023

D’arrigo et al 2006: NWNA Alaska

Dec 14, 2023 – 5:04 PM

Today’s article is about one of the D’Arrigo et al 2006 datasets. D’Arrigo et al 2006, then under submission, had been cited in drafts of the IPCC Fourth Assessment Report. I had been accepted as an IPCC reviewer and, as an IPCC reviewer, I asked IPCC to make the data available to me or to […]

By Stephen McIntyre | Posted in Uncategorized | Tagged , , | Comments (18)

Sheenjek, Alaska: A Jacoby-MBH Series

Dec 13, 2023 – 3:44 PM

MBH98 used three Jacoby tree ring chronologies from Alaska: Four Twelve (ak031) – discussed here, Arrigetch (ak032) and Sheenjek (ak033). Sheenjek will be discussed in this article. In our compilation of MBH98 in 2003, we observed that the Sheenjek chronology archived at NOAA Paleo was not the same as the “grey” version used in MBH98.  […]

By Stephen McIntyre | Posted in Uncategorized | Tagged , , | Comments (6)

Four Twelve, Alaska: A Jacoby Series

Dec 13, 2023 – 1:25 PM

Four Twelve (Alaska) was one of the 11 Jacoby and D’Arrigo series used in MBH98. In our original 2003 article, we observed that the MBH98 version of this chronology differed substantially from the chronology officially archived at NOAA, and, in our sensitivity study, used the archived version (after using the MBH version for benchmarking.)  Among […]

By Stephen McIntyre | Posted in Uncategorized | Comments (1)

Discovery of Data for One of the “Other 26” Jacoby Series

Dec 12, 2023 – 1:32 PM

We’ve long discussed the bias imparted by ex post selection of data depending on whether it went up in the 20th century.  Likening such after-the-fact selection to a drug study carried out only on survivors. The Jacoby and d’Arrigo 1989 network was a classic example: the original article reported that they had sampled 36 northern treeline […]

By Stephen McIntyre | Posted in Uncategorized | Tagged , , , , | Comments (39)