cc: Tim Osborn <t.osborn@uea.ac.uk>, Malcolm Hughes <mhughes@ltrr.arizona.edu>, Keith Briffa <k.briffa@uea.ac.uk>, Kevin Trenberth <trenbert@cgd.ucar.edu>, Caspar Ammann <ammann@ucar.edu>, rbradley@geo.umass.edu, tcrowley@duke.edu, jto@u.arizona.edu, Scott Rutherford <srutherford@rwu.edu>, Tom Wigley <wigley@ucar.edu>, p.jones@uea.ac.uk
date: Tue, 14 Oct 2003 10:09:04 -0400
from: Michael Oppenheimer <omichael@Princeton.EDU>
subject: Re: draft
to: "Michael E. Mann" <mann@virginia.edu>

   Michael:

   I'm fine with the last paragraph.  However, the section on latitude dependence of
   tree-growth data remains obscure.  In particular, the sentence "In such cases, relatively
   recent (i.e. post 1950) data are not used in calibrating temperature reconstructions"
   leaves the impression that data is rejected because it doesn't fit expectation.  For the
   uninitiated, you need a few words on why this procedure is acceptable, like perhaps
   "because confounding influences obscure the response to temperature" or whatever.

   Michael

   Michael

   "Michael E. Mann" wrote:

     Thanks Tim and Malcolm,

     The latest round of suggestions were extremely helpful. I've accepted them w/ a few
     minor tweaks (attached). We're at 765 words--I think AGU will let us get away w/ that...

     So, comments from others?

     Thanks,

     mike

     At 02:11 PM 10/14/2003 +0100, Tim Osborn wrote:

     SO3 argue that borehole data provide a conflicting view of past temperature histories.
     To the contrary, the borehole estimates for recent centuries shown in M03 may be
     consistent with other estimates, provided consideration is given to statistical
     uncertainties, spatial sampling and possible influences on the ground surface [e.g.,
     snow cover changes--Beltrami and Kellman, 2003].  It is not meaningful to compare the
     late 20th century with a much longer period 1000 years ago [Bradley et al., 2003],
     especially given the acknowledged limitations [Pollack et al., 1998] of borehole data.

     ______________________________________________________________
                         Professor Michael E. Mann
                Department of Environmental Sciences, Clark Hall
                           University of Virginia
                          Charlottesville, VA 22903
     _______________________________________________________________________
     e-mail: mann@virginia.edu   Phone: (434) 924-7770   FAX: (434) 982-2137
             [1]http://www.evsc.virginia.edu/faculty/people/mann.shtml

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