Sunday, March 18, 2012


cc: myles <>, francis <>, Tim Barnett <>, Reiner Schnur <>, Phil Jones <>, Tom Crowley <>, Nathan Gillett <>, David Karoly <>, Jesse Kenyon <>, "Petty,Rick"<>,, "Pennell, William T" <>,, Gabi Hegerl <>,,, Doug Nychka <>, Ben Santer <>, Karl Taylor <>, "Stott, Peter" <>
date: Mon Jul 5 14:02:27 2004
from: Phil Jones <>
subject: IDAG and Boreholes

Gabi and Francis,

On the boreholes, it is important to add these two references in on p7 by rewording
sentence beginning 'Recently, Mann et al (2003) ..' . Maybe Tom can do this. My problem is
I'm still trying to settle into our new house. I will be away some mornings this week and
am trying
to catch up with a lot of other emails that have come. Today is my first day in for about
2 weeks
Also you've only sent a pdf version of the submitted paper, and I can't alter that.
In the following section on paleo forcing and modelling studies, I would suggest that
Tom replaces LIA references with dates.
As for the specific comments on p 24-25 remove the second one which is repetitive.
As for the first maybe remove 'controversy' and rephrase the sentence to be a little less
One final thing, on p6 add in a reference ... (see reviews by Jones et al., 2001
and Jones and Mann, 2004).

Jones, P.D. and Mann, M.E., 2004: Climate over past millennia. Reviews of Geophysics, 42,
I will be around if you can send me a revised draft in a few days and I can check what
you've done.
On some of the other issues, I like Fig 6. It is better than the scaling factors for lay
readers. The oceans bit requires a bit of rework to add in some new references. Both
reviewers want additional references in many places - it would seem another page or two.
This will be good training for you Gabi with IPCC coming along !
I would hope that if we do this correctly and respond to each point adequately then
the reviewers (neither of whom seem to want to go through it again) will not get the
paper again and Dave Randall can do his editing job.

Dear Colleagues,
Attached are two papers, recently published in the Journal of
Geophysical Research - Atmospheres, to which I call your attention:
Pollack, H.N. and Smerdon, J.E., Borehole climate reconstructions: Spatial
structure and hemispheric averages, J. Geophys. Res. 109, D11106,
doi:10.1029/2003JD004163, 2004
Rutherford, S. and Mann, M.E., Correction to "Optimal surface temperature
reconstructions using terrestrial borehole data", J. Geophys. Res. 109,
D11107,doi:10.1029/2003JD004290, 2004
The first paper presents a detailed study of the aggregation of individual
borehole reconstructions to form a hemispheric average; the investigation also
demonstrates that when the borehole reconstructions are properly aggregated,
they display significant spatial correlation with the surface air temperature
(SAT) at sub-hemispheric spatial scales. In this paper we also identify an error
in the paper "Optimal surface temperature reconstructions using terrestrial
borehole data" by Mann et al. [JGR 108(D7),4203, doi:10.1029/2002JD002532], and
discuss the ramifications. Rutherford and Mann acknowledge the error in the
second paper attached.
I call these papers to your attention to help quell the propagation of the
identified error, and to reiterate that in terms of an average northern
hemisphere history over the past five centuries, the borehole reconstructions
yield a warming of the ground surface of about 1K, half of which occurred in the
20th century.
___ ___ Henry N. Pollack
[ \ / ] Professor of Geophysics
| \/ | Department of Geological Sciences
|MICHIGAN| University of Michigan
[___]\/[___] Ann Arbor, Michigan 48109-1063, U.S.A.
Phone: 734-763-0084 FAX: 734-763-4690
URL: [1]

Prof. Phil Jones
Climatic Research Unit Telephone +44 (0) 1603 592090
School of Environmental Sciences Fax +44 (0) 1603 507784
University of East Anglia
Norwich Email

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