Detailed model description
Page containing details for all model configurations available in S2S since the project start => ECCC model description
Overview of the model changes
| Model version | Implementation date in S2S | Time range | Resolution | Ens. Size | Frequency | Re-forecasts | Rfc period | Rfc frequency | Rfc size | Ocean resolution | Active Sea Ice |
|---|---|---|---|---|---|---|---|---|---|---|---|
GEPS 8 | 13/06/2024 | d 0-39 | Yin-Yang grid at 0.25° uniform resolution (~25 km) L85 | 20+1 | 2/week (Mon, Thu) | on the fly | 2001-2020 | 2/week (Mon, Thu) | 3+1 | 0.25° L50 | yes |
GEPS 7 | 02/12/2021 | d 0-32 | Yin-Yang grid at 0.35° uniform resolution (~39 km) L85 | 20+1 | weekly (Thu) | on the fly | 2001-2020 | weekly (Thu) | 3+1 | 0.25 dg/ L50 | yes |
GEPS 6 | 04/07/2019 | d 0-32 | Yin-Yang grid at 0.35° uniform resolution (~39 km) L45 | 20+1 | weekly (Thu) | on the fly | 1998-2017 | weekly (Thu) | 3+1 | 0.25° L50 | yes |
| GEPS 5 | 20/09/2018 | d 0-32 | Yin-Yang grid at 0.35° uniform resolution (~39 km) L45 | 20+1 | weekly (Thu) | on the fly | 1998-2017 | weekly (Thu) | 3+1 | N/A | N/A |
| GEPS 4 | 07/01/2016 | d 0-32 | 0.45x0.45 L40 | 20+1 | weekly (Thu) | on the fly | 1995-2014 | weekly (Thu) | 3+1 | N/A | N/A |
Description of the main changes
Ocean parameters
The 9 new ocean parameters from ECCC coupled model have been added to S2S archive for both real-time and on-the-fly reforecast runs since onwards.
GEPS 8
- operational from
- The version of the GEM model is upgraded to 5.2 with more advanced physics.
- The atmospheric model horizontal resolution is increased from 39km to 25km.
- The time range is extended from 32 days to 39 days.
- The forecast frequency is increased from once per week (Thursday) to twice per week (Monday and Thursday)
GEPS 7
- operational from
- The version of the GEM model is upgraded to 5.1 with more advanced physics.
- The number of vertical levels is increased from 81 to 85 for the data assimilation and from 45 to 85 for the forecast.
- A Stochastic Parameter Perturbation (SPP) method is introduced to replace the Physics Tendency Perturbation (PTP).
- 20 years hindcast period changed from 1997-2017 to 2001 to 2020 from
GEPS 6
- operational from
- coupled to ocean model NEMO 3.6 at 0.25° horizontal resolution and 50 vertical levels
- ECCC ocean analysis initialisation
- no ocean initial perturbation
- coupling frequency 15 minutes
GEPS 5
- operational from
- Yin-Yang grid
- increased the horizontal resolution from 50 to 39 km and the vertical one from 40 to 45 levels
- 20 years hindcast period changed from 1995-2014 to 1998 to 2017 from
GEPS 4
- operational from