From: David Rind To: Eystein Jansen Subject: Re: [wg1-ar4-ch06] Updated 6.1 (inc. Bette's comments) Date: Fri, 22 Jul 2005 13:17:42 -0400 Cc: wg1-ar4-ch06@joss.ucar.edu 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 clue... 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. David At 5:19 PM +0200 7/22/05, Eystein Jansen wrote: >Hi, >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 >think? > >Eystein >-- >______________________________________________________________ >Eystein Jansen >Professor/Director >Bjerknes Centre for Climate Research and >Dep. of Earth Science, Univ. of Bergen >Allégaten 55 >N-5007 Bergen >NORWAY >e-mail: eystein.jansen@geo.uib.no >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) -- /////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////// _______________________________________________ Wg1-ar4-ch06 mailing list Wg1-ar4-ch06@joss.ucar.edu http://www.joss.ucar.edu/mailman/listinfo/wg1-ar4-ch06