Sunday, April 1, 2012


date: Wed, 10 May 2006 10:23:18 -0600
from: Jonathan Overpeck <>
subject: [Wg1-ar4-ch06] Expert review of IPCC WG1 Chapter 6 Second Order

Dear Contributing Authors (CAs) of Chapter 6 - It is a bit
embarrassing for us to have waited this long to contact you all as a
group, but as you can imagine, the whole IPCC process has been a blur.

As you all probably understand, the IPCC process relies heavily on
the labors of many who are not compensated in any way to help provide
the best assessment of knowledge regarding climate change. You have
all been working with one or more Lead Authors of Chapter 6
Paleoclimate (the first such chapter in IPCC history!), and your
labors have helped generate what we hope is a strong second order
draft (SOD) of our chapter. The next draft (TOD) will be the final
draft and will be published next winter (2007). Thus, we have time to
make the final product even better than it already is.

MOST important at this point is careful expert review of the SOD. You
should all of received a formal email invitation (from the IPCC WGI
Technical Service Unit) to serve as expert reviewers of our chapter
(and indeed, the entire WGI SOD, if you are so inclined). But, please
take a close look at our current Chapter 6, and give us feedback
through the formal process. We especially need your feedback on those
sections relevant to your specific contributions, but also on the
entire chapter if you have time. Other chapters with paleo that might
be of interest are Chapters 1, 2, 4, 5, 7, 8, and 9. Chapters 10 and
11 draw on paleo in some ways.

Note that the DEADLINE is June 2, and that IPCC deadlines are for
real (as we've learned the hard way!).

Please note that the chapter is technically still too long - the IPCC
leadership has been impressed with what we've done, and has given us
more space than originally allocated, but we don't expect to grow
further. Indeed, we need to make the chapter even tighter and
shorter, so any comments on what could be shortened will be
appreciated. As we all know, there are insights from paleo that are
worth getting out, but that we chose not to include. We had tough
choices to make, and hopefully, we have focused on those aspects of
paleo science that are most relevant to policy makers. Our chapter
should NOT be viewed as a review, and in this light, we need to focus
primarily on the recent and most state-of-the-art references, rather
than the whole chain of papers that led us to this point - only in
really key areas can we cite the "classic" paper. Also, some
important issues, such as model evaluation, climate sensitivity and
climate change detection are supposed to be covered in other chapters
(8, 9 and 9, respectively). And, all assessment of future change
should be in chapters 10 and 11.

In the rush (you can't believe how intense the last minute editing
and formatting are w/ each draft), we left some names off the SOD
Contributing Author list on the first page of our chapter. For this,
we are truly sorry. We are also thankful that this isn't the final
draft, and promise to get it right next time! As best we know from
our Lead Author (LA) team, all of the Chapter 6 CA's are on the
attached list, and all got formal invitations to be formal expert
reviewers. Since our connections with some CAs comes via LAs, we've
also cc'd this email to LAs to make sure no one is still off the CA

Of course, if you feel you shouldn't be a CA of Chapter 6, or have
any other issues, please let us know. Our goal is to have a final
document that is recognized within our community, and throughout the
broader climate change community, as accurate and definitive. Again,
your help is MUCH appreciated. It is great to have you on the Chapter
6 team.

Don't forget that the DEADLINE for expert review is June 2.

Many thanks,

Eystein Jansen and Jonathan Overpeck
Coordinating Lead Authors, Chapter 6

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

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