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Standard Output for 20C3M

Program for Climate Model Diagnosis and Intercomparison

Lawrence Livermore National Laboratory

E-mail: covey1@llnl.gov

3 November 2003


Introduction

The following list of standard output for the CMIP "20th Century Climate in Coupled Models" pilot project (20C3M; see http://www-pcmdi.llnl.gov/cmip/ann_20c3m.html) assumes that output is produced in network Common Data Form (netCDF; see http://www.unidata.ucar.edu/packages/netcdf) and that the NetCDF Climate and Forecast (CF) Metadata Conventions (see http://www.cgd.ucar.edu/cms/eaton/cf-metadata) are followed. Use of netCDF and adherence to the CF convention are required for future contributions to CMIP and will be followed in future releases of CMIP data.

The NetCDF software library is maintained by the Unidata Program Center in Boulder, Colorado, under sponsorship of the University Corporation for Atmosphere Research; the Climate Data Analysis Tools (CDAT) software infrastructure (see http://esg.llnl.gov/cdat) also supports netCDF. NetCDF is now the most common format for exchange of ocean-atmosphere model output. The new CF conventions for netCDF data generalize and extend the Cooperative Ocean / Atmosphere Research Data Service (COARDS) conventions developed in the 1990s.

Output fields

Monthly Mean Surface Data
CF Standard name PCMDI name Units
1 air_pressure_at_sea_level psl Pa
2 precipitation_flux pr kg m-2 s-1
3 air_temperaturea tas K
4 sea_surface_elevation m
5 sea_surface_temperature K
6 sea_ice_area_fraction sic (dimensionless fraction)
7 sea_ice_thickness sit m
8 moisture_content_of_soil_layerb mrsos kg m-2
9 soil_moisture_contentc mrso kg m-2

aAlso known as "surface air temperature." Distinguish from 3-D air temperature by specifying a size-one dimension of height with coordinate value 2 m.
bIn the upper 0.1 m only.
cTotal for all soil layers.

Monthly Mean 3-D Data
CF Standard name PCMDI name Units
1 cloud_area_fraction_in_atmosphere_layer cl (dimensionless fraction)
2 air_temperatured ta K
3 sea_water_temperature to K
4 sea_water_salinity so ppt (parts per thousand)

dOn AMIP standard pressure levels (= NCEP reanalysis levels): 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30, 20, 10 hPa.

Daily Surface Data
CF Standard name PCMDI name Units
1 air_pressure_at_sea_level psl Pa
2 precipitation_flux pr kg m-2 s-1
3 air_temperaturea, e tasmin K
4 air_temperaturea, f tasmax K

aAlso known as "surface air temperature." Distinguish from 3-D air temperature by specifying a size-one dimension of height with coordinate value 2 m.
eDaily minimum value. Designate by a cell_methods attribute specifying "time: minimum within days," where "time" is the name of the time dimension.
fDaily maximum value. Designate by a cell_methods attribute specifying "time: maximum within days," where "time" is the name of the time dimension.

 
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