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================================================================

 FLEXINVERT-Plus

================================================================

Description:
  FLEXINVERT-Plus is a Bayesian inversion framework
  for optimizing fluxes of different atmospheric
  species (e.g. CO2, CH4, BC).

Contents:
  1) prep_flexpart:
     - selects (and optionally averages) observations and prepares
       flexpart runs with releases for each observation
     - flexpart grid_time output files written per release
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     - note need at least FLEXPART-v10.2
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  2) prep_fluxes:
     - regrids fluxes (fluxes need to be at the same spatial 
       resolution as the flexpart grid_time files)
     - writes fluxes in a standard ncdf format required by
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       FLEXINVERT-Plus
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  3) prep_regions (optional):
     - prepares variable resolution grid for the inversion based 
       on flexpart flux sensitivities (output from prep_flexpart)
       (alternatively can provide own regions definition file)
  4) settings:
     - contains example SETTINGS_config and SETTINGS_files files
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       for FLEXINVERT-Plus
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  5) source:
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     - source code for FLEXINVERT-Plus
  6) prep_syndata:
     - prepares synthetic data for testing and OSEs
     - uses output from a forward run and adds random
       perturbations to the prior fluxes and observations
       according to the error covariance matrices
  7) grid_to_ncdf:
     - extra tool (not needed for FLEXINVERT-Plus) to convert
       the binary grid_time files to NetCDF
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