Sunday, March 18, 2012


date: Fri, 22 Jul 2005 13:17:42 -0400
from: David Rind <>
subject: Re: [wg1-ar4-ch06] Updated 6.1 (inc. Bette's comments)
to: Eystein Jansen <>

Hi Eyestein,

Thanks for your comments. With respect to the
suggested changes in paragraphs 1,2 and 4, they
seem fine to me. However, I think we need to
include in paragraph 5 potential reasons as to
why the substantial (and not just significant)
high latitude warming that appears in the
mid-Pliocene record is not produced in GCMs in
response to higher CO2, in general - otherwise we
leave the reader with a big question and no
possible solution. The tendency of GCM
simulations for the future climate to produce an
NADW decrease forces those simulations to have
minimal high latitude warming in the North
Atlantic, exactly opposite the inference from the
Pliocene paleo-record (which is quite robust in
this respect at least). If the Pliocene record is
indicating the opposite of what current models
are predicting, it may be offering us a valuable

The suggested reasons also include the comment
that the lack of land ice at high northern
latitudes might be a strong contributing cause -
which would make it a no-analog situation, and
hence not fully a GCM problem.

I would favor leaving those two sentences as they were.


At 5:19 PM +0200 7/22/05, Eystein Jansen wrote:
>see enclosed some comments to the last version
>of the deep time box. I propose some deletions
>and some toning down of language. What do you
>Eystein Jansen
>Bjerknes Centre for Climate Research and
>Dep. of Earth Science, Univ. of Bergen
>All�gaten 55
>N-5007 Bergen
>Phone: +47-55-583491 - Home: +47-55-910661
>Fax: +47-55-584330
>Attachment converted: Toltec:IPCC Box
>6.1_latest_EJcomm.doc (WDBN/�IC�) (1BE54183)



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