1. Forecast system version
Identifier code: GEM-NEMO
First operational forecast run: August 1, 2019
2. Configuration of the forecast model
Is the model coupled to an ocean model? Yes
Coupling frequency: every hour
2.1 Atmosphere and land surface
| Model | GEM |
|---|---|
| Horizontal resolution and grid | 256×128 grid points (~155 km) |
| Atmosphere vertical resolution | 79 levels |
| Top of atmosphere | 0.075 hPa |
| Soil levels | 2 |
| Time step | 60 minutes |
Detailed documentation: Lin, H., J. Merryfield; R. Muncaster; G. C. Smith; M. Markovic; F. Dupont; F. Roy; J.-F. Lemieux; A. Dirkson; V. V. Kharin; W.-S. Lee; M. Charron, and A. Erfani, 2020: The Canadian Seasonal to Interannual Prediction System Version 2 (CanSIPSv2), Weather and Forecasting. https://doi.org/10.1175/WAF-D-19-0259.1
2.2 Ocean and cryosphere
| Ocean model | NEMO |
|---|---|
| Horizontal resolution | 1°×1° (1/3 degree meridionally near the equator) |
| Vertical resolution | 50 levels |
| Time step | 30 minutes |
| Sea ice model | CICE |
| Sea ice model resolution | Same as NEMO |
| Sea ice model levels | 5 ice-thickness categories |
| Wave model | N/A |
| Wave model resolution | N/A |
Detailed documentation:
3. Initialization and initial condition (IC) perturbations
3.1 Atmosphere and land
| Hindcast | Forecast | |
|---|---|---|
| Atmosphere initialization | ERA-interim | GEPS |
| Atmosphere IC perturbations | Random isotropic perturbations | Ensemble Kalman Filter |
Land Initialization | Off-line Surface Prediction System (SPS) forced by ERA-interim | SPS forced by the CCMEP analysis |
| Land IC perturbations | None | None |
| Soil moisture initialization | Off-line Surface Prediction System (SPS) forced by ERA-interim | SPS forced by the CCMEP analysis |
| Snow initialization | Off-line Surface Prediction System (SPS) forced by ERA-interim | SPS forced by the CCMEP analysis |
| Unperturbed control forecast? | none | none |
Data assimilation method for control analysis:
Horizontal and vertical resolution of perturbations:
Perturbations in +/- pairs:
Detailed documentation:
3.2 Ocean and cryosphere
| Hindcast | Forecast | |
|---|---|---|
| Ocean initialization | ORAP5 | CCMEP GIOPS analysis |
| Ocean IC perturbations | None | None |
| Unperturbed control forecast? | None | None |
Detailed documentation:
4. Model Uncertainties perturbations:
| Model dynamics perturbations | None |
|---|---|
| Model physics perturbations | implicit and explicit surface flux numerical formulation for 5 members each |
If there is a control forecast, is it perturbed? | No |
Detailed documentation:
5. Forecast system and hindcasts
| Forecast frequency | once a month |
|---|---|
| Forecast ensemble size | 10 |
| Hindcast years | 1980-2010 |
| Hindcast ensemble size | 10 |
| On-the-fly or static hindcast set? | static |
