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

Sat Feb 18 04:39:09 MST 2012

Hi,

If the problem was a copy & paste from the historicalVL experiment, then 
you have just to change the description of the HistoricalMisc. This is 
done in the esgcet DB, in the table experiment.

But we have a different description for it:
esgcet=# SELECT * from experiment where name='historicalVL';
      name     | project |   description
--------------+---------+------------------
  historicalVL | cmip5   | volcanic aerosol
(1 row)

esgcet=# SELECT * from experiment where name='historicalMisc';
       name      | project |                                        
description
----------------+---------+--------------------------------------------------------------------------------------------
  historicalMisc | cmip5   | historical simulation but with other 
individual forcing agents or combinations of forcings
(1 row)

If you have the same description as we do, then the information is 
coming from somewhere else.

Hope this helps,
Estani

Am 17.02.2012 23:44, schrieb Mike Berkley:
> Probably, we should have corrected esg.ini before publishing, but we
> didn't realize that it had this effect.
>
> It would help if we knew how to correct the error.  The "volcanic
> aerosol" description does not appear in the map file, and
> esgupdate_metadata didn't think "experiment_options" was a property to
> adjust.  Unpublish and republish doesn't resolve the problem, even
> with a database delete.  I'm not sure what command to use to update
> the description in local THREDDS and the gateway.
>
>
>
> On Fri, Feb 17, 2012 at 13:04, Karl Taylor<taylor13 at llnl.gov>  wrote:
>> Hi Mike,
>>
>> Do you want us to do something on our end?
>>
>> I'm not that familiar with esg.ini.  For anyone who publishes an
>> historicalMisc dataset, will the experiment description that appears in  ESG
>> be "volcanic aerosol"?  If so, this is generally wrong, so what should be
>> done to fix this?
>>
>> best regards,
>> Karl
>>
>> On 2/17/12 10:54 AM, Mike Berkley wrote:
>>
>> The "volcanic aerosol" description was a  surprise to CCCma, since it
>> appeared nowhere in our netCDF files.  We finally found "volcanic
>> aerosol" associated with historicalMisc in the default data node
>> esg.ini file from PCMDI.  We have corrected our copy of esg.ini, but
>> have so far not found the magic incantation to update the metadata
>> description.  Unpublishing and republishing does not change the
>> metadata, presumably because the data hasn't actually changed.
>>
>>
>>
>>
>> On Thu, Feb 16, 2012 at 12:21, Karl Taylor<taylor13 at llnl.gov>  wrote:
>>
>> 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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-- 
Estanislao Gonzalez

Max-Planck-Institut für Meteorologie (MPI-M)
Deutsches Klimarechenzentrum (DKRZ) - German Climate Computing Centre
Room 108 - Bundesstrasse 45a, D-20146 Hamburg, Germany

Phone:   +49 (40) 46 00 94-126
E-Mail:  gonzalez at dkrz.de