[CCSM-participants] Draft plan for CMIP5 (IPCC AR5 model output)

[Barbara Ballard]

Oops!  I forgot the attachment.....here it is.  Barbara

Barbara Ballard wrote:
> Dear all,
>
> As most of you know, plans are well underway for a coordinated set of 
> climate model experiments, which will constitute the Fifth phase of 
> CMIP.  Attached is a description of the proposed experiments.   As 
> members of the CMIP panel, which was established by the WCRP's Working 
> Group on Coupled Modelling (WGCM) to help coordinate this activity, we 
> are seeking your comments.  Considerable thought and input from a wide 
> community of scientists have already contributed to the CMIP5 design, 
> and therefore major changes are not envisioned.  Competing interests and 
> various tradeoffs have been carefully considered before coming up with 
> the proposed suite of experiments.  Please keep in mind that modeling 
> groups have limited resources and the experiment must represent a 
> compromise among various priorities. We will not be able to please everyone.
>
> The CMIP panel must present a final design plan for CMIP5 to the WGCM at 
> its annual meeting in September, just two months from now.   Given this 
> tight deadline (which cannot slip if the CMIP5 results are to be 
> available in time for the IPCC's Fifth Assessment Report).   For this 
> reason, we ask that you send us (taylor13 at llnl.gov and  
> Ronald.Stouffer at noaa.gov) any comments and suggestions you have by 
> September 1, 2008.
> Feel free to pass this document on to anyone you think will have an 
> interest in it.  We invite comments from scientists associated with all 
> aspects of the climate change issue, spanning the three IPCC working groups.
>
> With best regards,
> Karl Taylor (PCMDI) and Ron Stouffer (Chair, CMIP panel).
>
> P.S. Please note that there are remaining details yet to be worked out.  
> In particular it has been suggested that experiments 4.2 a&b described 
> in the document should be performed in conjunction with the so-called 
> RCP-driven experiments given in Table 2 rather than with the idealized 
> (1% CO2 increase per year) experiments of Table 4.  Experiments 4.2 
> allow us to separate out the climate-carbon cycle feedback. The original 
> proposal was in fact to do this separation for the RCP runs, but several 
> scientists offered compelling arguments for switching this diagnostic 
> analysis to the 1% runs.  Some of the reasons for making this change 
> from the original proposal can be found in section 9.  Still, there are 
> some scientists who continue to express a preference for the original 
> design.  Please let us know what you think about this.
>
>   

-- 
Barbara Ballard
Administrative Assistant III
CCSM Program Office
Oceanography Section
National Center for Atmospheric Research
P.O. Box 3000
Boulder, CO  80307-3000
Phone: (303) 497-1358
Fax:   (303) 497-1700

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