Atmospheric model
| HRES | ENS | |||||||
|---|---|---|---|---|---|---|---|---|
| Leg A | Leg B | Leg C | ||||||
Current | Upgrade | Current | Upgrade | Current | Upgrade | Current | Upgrade | |
| Spectral | TL1279 | TCO1279 | TL639 | TCO639 | TL319 | TCO639 | TL319 | TCO319 |
| Gaussian grid | N640 | O1280 | N320 | O640 | N160 | O640 | N160 | O320 |
| Horizontal grid resolution | ~16 km | ~9 km | ~32 km | ~18 km | ~64 km | ~18 km | ~64 km | ~36 km |
| Dissemination (LL) | 0.125 | 0.0625 (TBC) | 0.25 | 0.125 | 0.5 | 0.125 | 0.5 | 0.25 |
Model Level | 137 | 137 | 91 | 91 | 91 | 91 | 91 | 91 |
- There will be no change in the number and definition of the pressure levels.
- There will be no change in the model level vertical resolution.
- The horizontal resolution of the ENS re-forecasts will be increased to match that of ENS.
- The horizontal resolution of the two ENS constant-resolution forecasts provided for calibration and validation purposes will be increased:
| ENS calibration / validation | ||||
|---|---|---|---|---|
| High resolution | Low resolution | |||
Current | Upgrade | Current | Upgrade | |
| Spectral | TL639 | TCO639 | TL319 | TCO319 |
| Gaussian grid | N320 | O640 | N160 | O320 |
| Horizontal grid resolution | ~32 km | ~18 km | ~64 km | ~36 km |
Model Level | 91 | 91 | 91 | 91 |
Wave model
| HRES | ENS | |||||
|---|---|---|---|---|---|---|
| Leg A | Leg B / C | |||||
Current | Upgrade | Current | Upgrade | Current | Upgrade | |
| Latitudinal spacing of the native grid in degrees | 0.25 | 0.125 | 0.5 | 0.25 | 0.5 | 0.5 |
| Horizontal grid resolution of the native grid | ~28km | ~14km | ~55km | ~28km | ~55km | ~55km |
| Dissemination (LL) | 0.25 | 0.125 | 0.5 | 0.25 | 0.5 | 0.5 |
| Frequencies | 36 | 36 | 30 | 36 | 25 | 30 |
| Directions | 36 | 36 | 24 | 36 | 12 | 24 |
The configuration of the HRES stand-alone wave model (HRES-SAW) will be unchanged (0.1 latitudinal spacing, 11km native grid resolution and 0.125x0.125 dissemination)
Ocean model
No changes will be made to the resolution of the ocean model used in the monthly extension of the ENS to 46 days.
Summary for atmospheric component of HRES, ENS, 4DVar and EDA
The current cycle is in blue and the upgrade is in red.
| Grid resolution (km) | HRES | ENS | 4DVar | EDA | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Leg A | Leg B | 1st | 2nd | 3rd | Outer | 1st | 2nd | ||||
| 128 | TL159 | TL159 | |||||||||
| 100 | TL191 | TL191 | |||||||||
| 80 | TL255 | TL255 | TL255 | ||||||||
| 64 | TL319 | TL319 | |||||||||
| 50 | TL399 | TL399 | |||||||||
| 36 | TCO319 | ||||||||||
| 32 | TL639 | ||||||||||
| 18 | TCO639 | TCO639 | |||||||||
| 16 | TL1279 | ||||||||||
| 9 | TCO1279 | ||||||||||