SUMMIT 1.4 km NDJF seasonal run dataset: Example Polytope requests

For an introduction to accessing data via the Polytope Service, please refer to Section 4 of DE-DTE-2-22.D4. 

For full details on the usage of the Polytope service to retrieve DestinE data from the archive, please refer to the Milestone note for DE-EDT-5-22.M2.

Below are several examples of key-value pairs which would be used as the "request" within the polytope service.

Surface fields

Retrieve "Sea ice area fraction" (param 31; grid O8000) and "Sea surface temperature" (param 34; grid O8000) at step 0 (0 hours after run start: 2018-11-01, 00:00:00):

request = {
  'class' : 'rd',
  'date' : '2018-11-01',
  'expver' : 'hs3g',
  'levtype' : 'sfc',
  'param' : '31/34',
  'step' : '0',
  'stream' : 'oper',
  'time' : '00:00:00',
  'type' : 'fc'
}

Model level fields

Retrieve "Pressure" (param 54; grid T_CO7999) for the lowest 10 model levels at step 6 (6 hours after run start: 2018-11-01, 06:00:00):

request = {
  'class' : 'rd',
  'date' : '2018-11-01',
  'expver' : 'hs3g',
  'levelist': '128/to/137',
  'levtype' : 'ml',
  'param' : '54',
  'step' : '6',
  'stream' : 'oper',
  'time' : '00:00:00',
  'type' : 'fc'
}

Pressure level fields

Retrieve "Specific humidity" (param 133; grid O8000) for the lowest 10 pressure levels at step 24 (24 hours after run start: 2018-11-02, 00:00:00):

request = {
  'class' : 'rd',
  'date' : '2018-11-01',
  'expver' : 'hs3g',
  'levelist': '150/200/250/300/400/500/700/850/925/1000',
  'levtype' : 'pl',
  'param' : '133',
  'step' : '24',
  'stream' : 'oper',
  'time' : '00:00:00',
  'type' : 'fc'
}

Additional request keywords

See the milestone note DE-EDT-5-22.M2 for other keywords which can be used to retrieve parameters on the spectral  T_CO7999 grid only at a coarsened resolution or for a reduced area. For example:

• To use a coarsened 1° x 1° lat/long grid, use the keyword:

  • 'grid' : '1.0/1.0'

• To extract data for a given area, for example Europe, use the keyword:

  • 'area' : '73.5/-27/33/45'