Tag Archives: co2detrend

The Hockey Stick and the Milankovitch Theory

Feb 3, 2010 – 6:18 AM

The 20th century warming counters a millennial-scale cooling trend which is consistent with long-term astronomical forcing. MBH99 According to the UMass researchers, the 1,000-year reconstruction reveals that temperatures dropped an average of 0.02 degrees Celsius per century prior to the 20th century. This trend is consistent with the “astronomical theory” of climate change, which considers […]

By Jean S | Posted in Jacoby, Mann PC1, MBH98, Noamer Treeline, Replication | Also tagged , , , | Comments (62)

Mann's co2detrend.f Calculation

Nov 14, 2007 – 1:28 PM

If someone felt that it was necessary to detrend the bristlecone pine-based PC1 of Mann’s AD1000 network for CO2 fertilization, it’s doubtful that the initial instinct would be to coerce the data to a network of northern Canadian-Alaskan tree ring chronologies where the possibility of regional differences must surely be allowed for. Inspection of Mann’s […]

By Stephen McIntyre | Posted in MBH98, Replication, Source Code, Uncategorized | Also tagged | Comments (6)

The MBH99 CO2 "Adjustment"

Nov 13, 2007 – 6:58 PM

We’ve all had enough experience with the merry adjusters to know that just because someone “adjusts” something doesn’t necessarily mean that the adjustment makes sense. A lot of the time, the adjuster arm waves through the documentation and justification of the adjustment. Today I’m going to work through aspects of one of the most problematic […]

By Stephen McIntyre | Posted in MBH98 | Also tagged , | Comments (68)