KSEC1 element Contents GRIB octet Recommended GRIB_API keys Coded GRIB_API keys Comments
37 
ECMWF local GRIB use definition identifier.
15 = Seasonal forecast data
 41 localDefinitionNumber localDefinitionNumber
38 Class 42 class marsClass
39 Type 43 type marsType
40 Stream 44-45 stream marsStream
41 
Version number or experiment identifier.
(4 ASCII characters, right justified)
 46-49 expver experimentVersionNumber
42 Ensemble member number 50-51 number
 perturbationNumber
43 
Total number of ensembles.
Was set to zero in earlier versions of definition 15
 56-57 (note change in sequence of octet order)


44 
System number
  The "scientific version" number.
  0 = RD experiment
  1 - 65534 = operational version number
  65535 = missing
52-53 system
 systemNumber
45 
Method number
  Distinguishes scientifically different forecast ensembles
  (eg different calibration/bias correction)
  0 = control integration (ie without data assimilation)
  1 - 65534 = operational version number
54-55 method
 methodNumber
- Spare (set to zero) 58-60