date: Tue, 18 Apr 2006 16:26:27 -0400
from: Henry Pollack <hpollackatXYZxyzch.edu>
subject: IPCC FAR draft
to: Keith Briffa <k.briffaatXYZxyz.ac.uk>
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 184.108.40.206, 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
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 The Africa work is unpublished.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.
___ ___ Henry N. Pollack
[ \ / ] Professor of Geophysics
| \/ | Department of Geological Sciences
|MICHIGAN| University of Michigan
[___]\/[___] Ann Arbor, Michigan 48109-1005, U.S.A.