For instantaneous fields, a monthly mean is the mean of the fields sampled at the specified averaging period.
For accumulated fields, a monthly mean is the mean rate of accumulation of the fields.
| KSEC1 element | Contents | GRIB octet | Recommended GRIB_API keys | Coded GRIB_API keys | Comments |
|---|---|---|---|---|---|
| 37 |
ECMWF local GRIB use definition identifier. |
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. |
46-49 | expver | experimentVersionNumber | |
| 42 |
Number |
50-51 | number |
perturbationNumber |
|
| 43 | Zero | - | |||
| 44 |
System number |
52-53 | system |
systemNumber |
|
| 45 |
Method number |
54-55 | method |
methodNumber |
|
| 46 | Verifying month (in format YYYYMM) | 56-59 | verifyingMonth |
verifyingMonth |
|
| 47 | Averaging period (eg 6-hour, 24-hour) | 60 | averagingPeriod |
averagingPeriod |
|
| 48 | Forecast month | 61-62 | forecastMonth |
forecastMonth |
|
| - | Spare (set to zero) | 63-80 |