Malcolm Hughes coauthor Matthew Salzer) made a presentation entitled “Twentieth Century Bristlecone Pine Tree Rings near Upper Tree Limit Wider than in Recent Millennia”. This included a report on Sheep Mountain. He showed a picture of Matthew Salzer on Sheep Mountain and praised his work. He said that there was no difference between strip bark and whole bark chronologies and showed a graphic up to 2005 with relatively wide recent ring widths. Linah Ababneh’s name did not pass his lips (the Ababneh thesis showing non-nomalous 20th results discussed here, here here), nor did he discuss her work. In Ryan Maue’s felicitous phrase, it was as though she had been put in witness protection. The words “CO2 fertilization” also did not pass his lips in a discussion of possible explanations for the recent behavior.
He showed a photo BCPs at 3400-3500 m: it’s definitely dried looking than Almagre. He described the substrate “if you can call it soil”. He showed graphs from Lamarche et al 1984 and Graybill and Idso 1993. Sheep Mt was now said to have 300 samples and to go to 2005 (also mentioned Pearl Peak, Mt Wahington). Showed chronologies which visually were not small in recent years.
He showed a picture of a core along the lines of pictures shown for Almagre at CA showing relatively wide recent widths as compared to the 19th century. He showed a plot with 50-year bins back to 3000 BC or so showing that the present widths were the widest since about 2000 BC (when there was also a period of wide ring widths).
He showed a plot of whole bark and strip bark (# 12) showing no noticeable difference in chronologies. For reference, here is Linah Ababneh’s plot showing a material difference:
Abaneh Figure 3.Sheep and Patriarch strip and whole bark tree-ring width chronologies compared with Briffa et al. 1992 summer reconstruction based on tree-ring density. All chronologies are filtered after converting to z-scores to match the scale. Tree-ring data and Briffa et al. (1992) data are filtered using an 8-year low-pass filter (Fritts 1976). Confidence Intervals are based on the Briffa et al. (1992) series
He said that the increase could be attributed to temperature increase citing temperature stations at Barcroft and Crooked Creek.
Again for reference, here is Abaneh’s plot of ring width chronology:
Ababneh Fig. 5. Cold and warm periods as inferred from tree ring widths chronology (Ababneh, 2006, This study) fluctuations above and below the mean after normalizing, whole-bark and strip-bark chronologies are grouped together from two sites Patriarch Grove and Sheep Mountain.
Linah Ababneh’s result are different than the results presented at AGU. Malcolm Hughes was on Linah Ababneh’s thesis committee but did not mention her work which arrived at different conclusions than the ones presented here. Linah Ababneh’s thesis said that the data would be archived at ITRDB, but Hughes and her other thesis supervisors did not archive the data. David Meko said that they had lost track of Ababneh although she was easily located. When asked about the data by a CA reader, she said that she had legal advice not to provide the data to me.
Why didn’t Hughes acknowledge the efforts of Linah Ababneh in collecting Sheep Mt data, while acknowledging the efforts of Matthew Salzer? Why didn’t he discuss her conflicting results?