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For a record of changes made to this page please refer to Document versions.
Further information and advice regarding the upgrade can be obtained from User Support.
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The table below summarizes the upgrades in model components and initialization for SEAS5.
| System 4 | SEAS5 | ||
|---|---|---|---|
| IFS Cycle | 36r4 | 43r1 | |
| IFS horizontal resolution | TL255 | TCO319 | |
| IFS Gaussian grid | N128 (80 km) | O320 (35 km) | |
| IFS vertical resolution (TOA) | L91 (0.01 hPa) | L91 (0.01 hPa) | |
| IFS model stochastic physics | 3-lev SPPT and SPBS | 3-lev SPPT and SPBS | |
| Ocean model | NEMO v3.0 | NEMO v3.4 | |
| Ocean horizontal resolution | ORCA 1.0 | ORCA 0.25 | |
| Ocean vertical resolution | L42 | L75 | |
| Sea ice model | Sampled climatology | LIM2 | |
| Atmosphere initialization (Re-forecast/Forecast) | ERA-Interim/Operations | ERA-Interim/Operations | |
Land Initialization | ERA-Interim land (36r4)/Operations | ERA-Interim land (43r1)/Operations | |
| Ocean initialization | ORA-S4 | ORS-S5 | |
| Forecast ensemble size | 51 (0-7m) 15 (8-13m) | 51 (0-7m) 15 (8-13m) | |
| Re-forecast years | 30 (1981-2010) | 36 (1981-2016) | |
| Re-forecast ensemble size | 15 (0-7m) 15 (8-13m) | 25 (0-7m) 15 (8-13m) | |
| Calibration period | 1981-2010 | 1993-2016 | |
| Products Release Date | The 8th of each month at 12UTC | The 5th of each month at 12UTC |
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| GRIB 1 Section 1 Octets | GRIB 2 (only for SEAS5) Octets | grib_api/ecCodes key name | Component | Model ID | ||
|---|---|---|---|---|---|---|
| System 4 | SEAS5 | |||||
| 6 | 14 (in Section 4) | generatingProcessIdentifier | Atmospheric model | 139 | 147 | |
| Ocean wave model | 107 | 112 | ||||
| 52-53 | 18-19 (in Section 2) | systemNumber | 4 | 5 | ||
GRIB 2 data
SEAS5 model level data is coded in GRIB 2, compared to GRIB 1 for System 4. The change to GRIB 2 for model level data was introduced in IFS Cycle 37r2 in 2011. See under User impact below for more information.
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Graphical products from the seasonal forecast system are displayed on the Forecast Charts pages of the ECMWF website. Pre-operational SEAS5 charts for Jan-Oct 2017 are available at https://wwwapps.ecmwf.int/enwebapps/forecasts/charts/seasonal_system5/opencharts/?facets=%7B%22Range%22%3A%5B%22Long%20%28Months%29%22%5D%7D.
Time-critical applications
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