Thursday, May 3, 2012

3754.txt

date: Sat, 12 Jun 2004 13:31:36 -0400
from: Henry Pollack <hpollackatXYZxyzch.edu>
subject: Borehole climate reconstructions
to: ralley@essc.psu.edu, ammann@ucar.edu, david.m.anderson@noaa.gov, k.briffa@uea.ac.uk, broecker@ldeo.columbia.edu, drdendro@ldeo.columbia.edu, tcrowley@duke.edu, mark.eakin@noaa.gov, esper@wsl.ch, fidel@gkss.de, jhansen@giss.nasa.gov, hegerl@duke.edu, p.jones@uea.ac.uk, cfk@lanl.gov, kondratyev@KK10221.spb.edu, mmaccrac@comcast.net, anders@misu.su.se, t.osborn@uea.ac.uk, jto@u.arizona.edu, simon.tett@metoffice.com, trenbert@ucar.edu, storch@gkss.de, weaver@ocean.seos.uvic.ca, wigley@ucar.edu, connie.woodhouse@noaa.gov, zorita@gkss.de


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.

Cheers,

Henry

___ ___ 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
e-mail: hpollackatXYZxyzch.edu
URL: http://www.geo.lsa.umich.edu/~hpollack
URL: www-personal.umich.edu/~hpollack/book.html










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