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  >>>HIST_GOCART<<<    'tavg2d_aer_x'
  >>>HIST_GOCART<<<    'tavg2d_aer_x'
  >>>HIST_GOCART<<<    'tavg3d_aer_p'
  >>>HIST_GOCART<<<    'tavg3d_aer_p'
#            'geosgcm_iau'
#            'geosgcm_conv'
#            'goswim_catch'
#            'goswim_land'
#            'goswim_landice'
#            'geosgcm_lidar'
#            'geosgcm_parasol'
#            'geosgcm_modis'
#            'geosgcm_radar'
#            'geosgcm_isccp'
#            'geosgcm_misr'
               ::
               ::


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Combined with the stream name, the template entry defines the filename, that is, at 060000 UTC on 1 April 2010 a file will be written out with the name: geosgcm_prog.20100401_0600z.nc4; the archive entry specifies a directory where the file will land; the format makes it complaint with the CFIO standard in GEOS; the frequency specifies how often a particular collection will be written out; the vertical units are defined in pressure, as opposed to model index levels; the levels entry specifies desired levels for the model output, and the fields entry allows for specification of a list of fields to be written. The variable grid_label defines the resolution of the output: here the use of the symbol "@", as in @HIST_IM and @HIST_JM, means that these are variables to be defined at setup time (as opposed to runtime).
Combined with the stream name, the template entry defines the filename, that is, at 060000 UTC on 1 April 2010 a file will be written out with the name: geosgcm_prog.20100401_0600z.nc4; the archive entry specifies a directory where the file will land; the format makes it complaint with the CFIO standard in GEOS; the frequency specifies how often a particular collection will be written out; the vertical units are defined in pressure, as opposed to model index levels; the levels entry specifies desired levels for the model output, and the fields entry allows for specification of a list of fields to be written. The variable grid_label defines the resolution of the output: here the use of the symbol "@", as in @HIST_IM and @HIST_JM, means that these are variables to be defined at setup time (as opposed to runtime).


Considerable more detail about GEOS GCM output stream and conventions can be found under: https://gmao.gsfc.nasa.gov/pubs/docs/Bosilovich785.pdf
It
 
Considerably more detail about GEOS GCM output streams and conventions, specifically related to the MERRA-2, can be found under: https://gmao.gsfc.nasa.gov/pubs/docs/Bosilovich785.pdf and those related to the GMAO Forward Processing system for Instrument Teams (FPIT) can be found under: