CMIP5 Internal File Metadata
Karl Taylor at PCMDI is leading an effort to define the requirements of netcdf attributes of files depostied in the archive.
In the CMIP3 archive data files had metadata like this example:
|title||GICC model output prepared for IPCC Fourth Assessment 2xCO2 equilibrium experiment|
|institution||GICC (Generic International Climate Center, Geneva, Switzerland)|
|source||GICCM1 (2002): atmosphere: GICAM3 (gicam_0_brnchT_itea_2, T63L32); ocean: MOM (mom3_ver_3.5.2, 2x3L15); sea ice: GISIM4; land: GILSM2.5|
|contact||Rusty Koder (email address)|
|project_id||IPCC Fourth Assessment|
|table_id||Table A1 (25 October 2007)|
|experiment_id||2xCO2 equilibrium experiment|
|history||Output from archive/giccm_03_std_2xCO2_2256. At 11:38:30 on 10/09/2008, CMOR rewrote data to comply with CF standards and IPCC Fourth Assessment requirements|
|references||Model described by Koder and Tolkien (J. Geophys. Res., 2001, 576-591). Also see http://www.GICC.su/giccm/doc/index.html 2XCO2 simulation described in Dorkey et al. (Clim. Dyn., 2003, 323-357.)|
|comment||Equilibrium reached after 30-year spin-up after which data were output starting with nominal date of January 2030|
Additional metadata is expected in CMIP5 of the following form:
|model_id||short official designation of each model to be used in publications.|
|forcing||list of forcing agents (e.g., volcanic aerosols, ozone, CO2)|
|associated_files||" " (space reserved in case we want to associate another file (like grid files?) with this one.)|
|creation_data||a date and time-stamp of the form: "2008-09-09T19:51:19Z"|
|realm||to designate roughly what component/domain the variable comes from (e.g., land, ocean, biosphere; suggestions for this vocabulary are welcome if they come within the next month or two).|
|tracking_id||" " (space reserved to provide a unique identifier associated with each file, which might be of some use to external databases).|
Notes from email with karl:
- model_id, will be controlled vocab by CMIP5 team ...
- forcing, controlled vocabulary for radiatively active species list ...
- realm, to be used to help with file organisation (e.g. directories), vocab to be decided.
- associated_files, hope not to use this