cc: jto@u.arizona.edu, eystein.jansen@geo.uib.no date: Tue, 18 Apr 2006 16:26:27 -0400 from: Henry Pollack subject: IPCC FAR draft to: Keith Briffa Hi Keith (and Peck and Eystein), I have recently been sent the current draft of the IPCC FAR by the US Global Change Research Program, asking for comments on the draft. This is the first time I have seen this product since we were feverishly exchanging e-mails in February. Let me call to your attention some small but not insignificant corrections to be made to the next draft. Page 6-33, Section 6.6.1.2, line 22. The title of this section (in italics) should be changed to "What do ground surface temperature reconstructions derived from subsurface temperature measurements tell us?" Page 6-33, lines 49 and 52, there is a reference (Smerdon et al., in press). This paper has now been published, so substitute "2006" for "in press", and in the list of references the citation should include the following: J. Geophys. Res. 111, D07101, doi:10.1029/2004JD005578 Page 6-34, lines 43 and 44. This section is dealing with the southern hemisphere. The sentence "...these both indicate unusually warm conditions prevailing in the 20th century (Pollack and Smerdon, 2004)" , and the reference therein, are both incorrect. The ground surface temperature changes over the last 500 years DO NOT indicate unusually warm conditions prevailing in the 20th century in Australia and southern Africa. This is because the unusually warm conditions developed late in the century, after most of the boreholes had already been logged. What the borehole reconstruction for Australia does show is very good correspondence with the Cook et al (2000) reconstruction for Tasmania and the Cook et al. (2002) recon for New Zealand. The Australia work is described in a manuscript “Five centuries of Climate Change in Australia: The View from Underground” by Pollack, Huang and Smerdon now under review in the Journal of Quaternary Science. The Africa work is unpublished. Is this e-mail to you sufficient to activate these changes? Or should I submit these comments to the US Government Review Panel? If I am to submit to the latter, they require all comments to be filed by May 9. Cheers, Henry ___ ___ Henry N. Pollack [ \ / ] Professor of Geophysics | \/ | Department of Geological Sciences |MICHIGAN| University of Michigan [___]\/[___] Ann Arbor, Michigan 48109-1005, U.S.A. Phone: 734-763-0084 FAX: 734-763-4690 e-mail: hpollack@umich.edu URL: www.geo.lsa.umich.edu/~hpollack/ URL: www-personal.umich.edu/~hpollack/book.html