[Go-essp-tech] How does "experiment=volcanic aerosol" come to be in CMIP5?

[Karl Taylor]

Hi Gary,

To be sure, the experiment_id for the CCCMA dataset shown below was (if 
correct) "historicalMisc".  When they published it, they chose to name 
the experiment "volcanic aerosol".  This is informational but is not 
used by the ESG search engines or in any other automatic processing that 
I know of.  (I thought whoever was publishing would just put in 
experiment="historicalMisc", so it would be consistent with the 
experiment_id global attribute.)

I don't think we've provided much guidance about this (outside the DRS 
document), but for each different combination of forcings in the 
historicalMisc runs, you should assign a different "physics_version" 
number (i.e., the "p" in the ensemble identifier, which in the example 
below is "p3").  You should also record in the global "forcing" 
attribute in the netCDF file each of the forcings included in each of 
your historical(Misc) runs.  If you do an ensemble of runs with the same 
forcing, they should all have the same "p" value and be distinguished by 
the "r" values.  The standard abbreviations for each forcing are 
provided in the last appendix of the DRS document and also can be found 
at  
http://cmip-pcmdi.llnl.gov/cmip5/docs/cmip5_data_reference_Appendix1-2.pdf  
[Note that the output_requirements, available at 
http://cmip-pcmdi.llnl.gov/cmip5/docs/CMIP5_output_metadata_requirements.pdf   
, describes the "forcing" attribute.]

I would like to put together a table that provides a key showing which 
forcings are included for each model and for each value of "p"; I just 
haven't gotten to this yet.

Please let me know if you can think of any way to make this clearer to 
everyone.

Best regards,
Karl



On 2/16/12 7:31 AM, Gary Strand wrote:
>
> At what point (publishing?) does one of an "historicalMisc" experiment 
> (as defined and required by the CMIP5 tables) get displayed as:
>
>
>
> I would like our (NCAR) "historicalMisc" datasets have a bit more 
> information available than just the standard (as described in the DRS 
> document) "historical simulation but with other individual forcing 
> agents or combinations of forcings."
>
> We have a whole slew of variations that are not readily 
> distinguishable (and less likely usable) by the above generic description.
>
> Thanks!
>
> Gary Strand
> strandwg at ucar.edu
>
>
>
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> GO-ESSP-TECH at ucar.edu
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