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Control and perturbed forecasts are identified in section 1 and 4. The following tables explains how to code them in GRIB2:
| Section 1 | |||
|---|---|---|---|
| Octets | Example perturbed | Example control | |
| 21 | typeOfProcessedData | =4 | =3 |
| Ensemble (section 4, template 4.61) | |||
|---|---|---|---|
| Octets | Example perturbed | Example control | |
| 35 | type of ensemble forecast | = 255 (missing) | = 255 (missing) |
| 36 | perturbation number | = 7 | = 0 |
| 37 | number of forecasts in ensemble | = 51 | = 51 |
3) Time component and reforecasts
4) Examples of GRIB2 files
| real-time | re-forecast | |
| Daily average | Control Perturbed | Control Perturbed |
| Accumulations | Control Perturbed | Control Perturbed |
| Instantaneous | Control Perturbed | Control Perturbed |
| Maximum over the last 6 hours | Control Perturbed | Control Perturbed |
| Minimum over the last 6 hours | Control Perturbed | Control Perturbed |
Example of a new ocean parameter