Thursday, May 10, 2012


date: Mon, 08 Dec 2003 08:37:25 -0500
from: "Michael E. Mann" <>
subject: Fwd: Re: data access
to: Tim Osborn <>, Michael Oppenheimer <omichaelatXYZxyznceton.EDU>, Phil Jones <>, Keith Briffa <>, <>, <>, Tom Wigley <wigleyatXYZxyzker.UCAR.EDU>, tom crowley <>, Gabi Hegerl <>, Jonathan Overpeck <>,,

Date: Fri, 05 Dec 2003 13:39:00 -0500
To: "Verardo, David J." <>
From: "Michael E. Mann" <>
Subject: Re: data access
Dear Dave,
Thanks for your inquiry.
As we encourage any good-faith attempts by other scientists to repeat our analysis, we
have indeed already made the data associated with our NSF-funded research which includes
the Mann et al, 1998 Nature article ('MBH98'); Mann et al, 1999 GRL article ('MBH99'),
and Mann et al, 2000 Earth Interactions article, available publicly.
All of the time series data shown in MBH98 (the hemispheric temperature reconstruction
and uncertainties, the reconstructed principal components "RPC" series, etc) were made
available both on this website:
and through the NOAA paleo data site:
at the time of publication.
All data (proxy indicators used and the reconstructions and uncertainties) associated
with MBH99 were made available at the time of publication, here:
as well as here:
We then made the detailed yearly spatial reconstructions available in 2000 at the NOAA
paleo website:
From the time of publication of MBH98, a listing of all of the proxy data (with some
minor typos) was provided here:
while details of the number of proxy indicators used in the stepwise reconstruction
approach were provided here:
and the instrumental temperature data, including eigenvectors and eigenvalues, and
instrumental series shown in the various figures, were provided here:
All of the proxy data used in MBH98 were made available on our public ftp site once the
various researchers that contributed data to our network were able to publish their own
data (July 2002). The data (all individual proxy indicators used as well as the various
PC representations of proxy sub networks for different time intervals) were provided in
the various clearly labeled directories here:
We provided extensive documentation of the data sets used in the supplementary
information lodged at Nature's web site in association with the publication of MBH98, so
that those wishing to repeat our analyses could either go to the same public domain
sources as us, or approach the colleagues who had kindly made data available to us. We
made considerable efforts to make the various data and numerical results readily
available online as soon as we were free to do so (in 2002), by setting up the public
ftp site referred to above, although we were under no known obligation to provide the
data in that particular medium. We gave as detailed a description of our methods as was
possible in the confines of a short paper, and in all these respects must have satisfied
the stringent standards set by the editor and reviewers of the journal in which we
In order to facilitate any attempt to reproduce our results we are now taking a further
step beyond those normally required in the publication of such research. We are working
with Nature to provide the MBH98 proxy data set in a more transparent, user-friendly
format than that set up in 2002, including additional documentation, fixing of minor
typos in the descriptions of different datasets, and providing some additional minor
methodological details of the MBH98 analysis. We are also providing the full raw
instrumental University of East Anglia/Climatic Research Unit surface temperature
dataset 1854-1993 (Briffa and Jones, 1992), because CRU has since updated their surface
temperature dataset, and no longer archives the version that we used when we began our
study in the mid 1990s.
Please let me know if there is any additional information I can provide you that would
be of help in this matter. I will of course update you once we/Nature have released the
revised data archive.
Best regards,
At 11:31 AM 12/5/2003 -0500, you wrote:

Dear Mike,
With regards to the recent request made by Stephen McIntyre and Ross
McKitrick for access to data that you and your colleagues used in a series
of peer-reviewed publications, please let me how and when you are planning
to release the data relevant to their request.
Thanks in advance for your help.
David J. Verardo
Director, Paleoclimate Program
Division of Atmospheric Sciences (Room 775)
National Science Foundation
4201 Wilson Blvd.
Arlington, VA 22203
phone: 703-292-8527
fax: 703-292-9023

Professor Michael E. Mann
Department of Environmental Sciences, Clark Hall
University of Virginia
Charlottesville, VA 22903
e-mail: Phone: (434) 924-7770 FAX: (434) 982-2137

Professor Michael E. Mann
Department of Environmental Sciences, Clark Hall
University of Virginia
Charlottesville, VA 22903
e-mail: Phone: (434) 924-7770 FAX: (434) 982-2137

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