Saturday, March 31, 2012


cc: Eystein Jansen <>, "Piers Forster" <>
date: Wed, 5 Jan 2005 09:55:24 -0700
from: Jonathan Overpeck <>
subject: Chapter 2 Forcings - the latest on solar from Judith Lean
to: Keith Briffa <>, Gabi Hegerl <>,, Fortunat Joos <>, joos <>, "Ricardo Villalba" <>,

Hi gang - attached is the hot off the press view on solar and
volcanic forcing from Chap 2. The purpose of my email is to start the
process of making sure we (at least chapters 2, 6 and 9) have
compatible perspectives on the isses, particularly solar.

Keith is the chapter 6 lead (Ricardo the second) on the last 2000
years (section, and David and Fortunat on climate forcing
(sec 6.5.2). David and Keith are doing our last 2000 model eval
section (sec In order to help Keith and Ricardo get their
section down to size, we've suggested that they move discussion of
the forcing to 6.5.2 (David and Fortunat need to finish this). Keith
has not yet responded that this is ok, but let's go with it until he
gets back into the mix.

I've also sent this to Gabe (Happy New Year Gabe!).

I suggest that the likely email discussion of the solar issue
(perhaps volcanic will be a bit hot too) is cc'd to all on this
email, plus any others that we think are key. I'm not sure Judith is
on email right now, but she's on the list too for obvious reasons
(Piers is the CLA coordinating this for Chap 2, so he's on too).

My personal take is that much of what has been done wrt to solar in
the paleo literature is now more suspect, but I think Fortunat in
particular might have some sage comments on this. The main thing is
that we don't ignore the latest work that suggests that solar forcing
is more subdued than often thought.

Debate? Thanks Chap 6 authors for coordinating with the other
chapters (e.g., 2 and 9) on this issue.

Best to all, Peck

>X-Sieve: CMU Sieve 2.2
>From: "Piers Forster" <>
>To: "'Jonathan Overpeck'" <>
>Subject: RE: Early draft: Natural Forcings
>Date: Wed, 5 Jan 2005 11:07:01 -0000
>Thread-Index: AcTyk5zrDHPy1i6XQ6OYxcStlz6FtwAgtapg
>X-Scanner: exiscan *1Cm919-00056N-00*XIzGZ/vmCRE* (The University of Reading)
>X-Virus-Scanned: by amavisd-new at
>Yes, please do send it...
>This is what we have at the moment

Jonathan T. Overpeck
Director, Institute for the Study of Planet Earth
Professor, Department of Geosciences
Professor, Department of Atmospheric Sciences

Mail and Fedex Address:

Institute for the Study of Planet Earth
715 N. Park Ave. 2nd Floor
University of Arizona
Tucson, AZ 85721
direct tel: +1 520 622-9065
fax: +1 520 792-8795

Attachment Converted: "c:\eudora\attach\natual.doc"

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