Running hofx application in JEDI and saving GeoVaLs

Running hofx application in JEDI and saving GeoVaLs#

prerequisite#

  • jedi-bundle is already built in your JEDI_BUILD.

  • Background files

  • observation files

  • Input geometry files

Introducton:#

In JEDI, GeoVaLs (Model values at observations locations) represent model fields interpolated to the locations (and time) of observations, providing the “model equivalent” needed for data assimilation. They are stored as 2D columns: one dimension corresponds to the observation locations, and the other to vertical levels.

In general, users do not need to interact with GeoVaLs directly, as they are part of JEDI’s internal interface. However, in some cases it may be useful to write GeoVaLs to file for inspection or debugging. For this purpose, the UFO filter GOMsaver can be used.

Using CS grid for background#

Using fv3-jedi interface

time window:
  begin: 2023-08-06T09:00:00Z
  length: PT6H

geometry:
  fms initialization:
    namelist filename: /discover/nobackup/mabdiosk/garage/applications/save-geovals/geometry_input/fmsmpp.nml
  akbk: /discover/nobackup/mabdiosk/garage/applications/save-geovals/geometry_input/akbk72.nc4
  npx: 361
  npy: 361
  npz: 72
  field metadata override: /discover/nobackup/mabdiosk/garage/applications/save-geovals/geometry_input/geos_cf.yaml

state:
  datetime: 2023-08-06T12:00:00Z
  filetype: cube sphere history
  datapath: /discover/nobackup/mabdiosk/garage/applications/save-geovals/bkg_cs
  filename: CF2.geoscf_jedi.20230806T120000Z.nc4
  state variables:
  - CO
  - O3
  - NO2
  - T
  - ua
  - va
  - DELP

observations:
  observers:
  - obs space:
      name: tempo_no2_tropo
      obsdatain:
        engine:
          type: H5File
          obsfile: /discover/nobackup/mabdiosk/garage/applications/save-geovals/obs/tempo_no2_tropo_20230806T090000Z_nasa_VCD.nc
      # will be written in geovals
      simulated variables:
      - volume_mixing_ratio_of_no2
      - eastward_wind
      - northward_wind
      derived variables: [volume_mixing_ratio_of_no2, eastward_wind, northward_wind]

    obs operator:
      name: Identity

    obs filters:
    - filter: GOMsaver
      filename: /discover/nobackup/mabdiosk/garage/applications/save-geovals/output/tempo_geovals2_cs.nc4

Using lat/lon grid for background#

Using VIND interface

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