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1. Forecast system version
Identifier code: GEM GEM5-NEMO
First operational forecast run: August 1 November 30, 20192021
2. Configuration of the forecast model
Is the model coupled to an ocean model? Yes
Coupling frequency: every 1/2 hour
2.1 Atmosphere and land surface
| Model | GEM |
|---|---|
| Horizontal resolution and grid |
283×190 YY-grid points ( |
~110 km) |
| Atmosphere vertical resolution |
|---|
| 85 levels | |
| Top of atmosphere | 0. |
|---|
| 1 hPa | |
| Soil levels (layers) | 2 Layer 1: 0 - 10 cm |
|---|---|
| Time step |
| 30 minutes |
Detailed documentation: Lin, H., J. Merryfield; R. Muncaster; G. C. Smith; M. Markovic; F. Dupont; F. Roy; J.-F. Lemieux; A. Dirkson; , G. T. Diro, W. J. Merryfield, G. Smith, M. Markovic, A. Erfani, V. V. Kharin; , W.-S. Lee; M. Charron, R. Parent, R. Pavlovic, and AM. ErfaniCharron, 20202021: The Canadian Seasonal to Interannual Prediction System Version version 2.1 (CanSIPSv2.1), Weather and Forecasting. . Canadian Meteorological and Environmental Prediction Centre technical note, Environment and Climate Change Canada. (https://doi.org/10.1175/WAF-D-19-0259.1collaboration.cmc.ec.gc.ca/cmc/cmoi/product_guide/docs/tech_notes/technote_cansips-210_e.pdf)
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-interim5 | GEPS |
| Atmosphere IC perturbations | Random isotropic perturbations | Ensemble Kalman Filter |
Land Initialization | Off-line Surface Prediction System (SPS) forced by ERA-interim5 | SPS forced by the CCMEP analysis |
| Land IC perturbations | None | None |
| Soil moisture initialization | Off-line Surface Prediction System (SPS) forced by ERA-interim5 | SPS forced by the CCMEP analysis |
| Snow initialization | Off-line Surface Prediction System (SPS) forced by ERA-interim5 | SPS forced by the CCMEP analysis |
| Unperturbed control forecast? | none | none |
...
Perturbations in +/- pairs:
Detailed documentation:
3.2 Ocean and cryosphere
| Hindcast | Forecast | |
|---|---|---|
| Ocean initialization | ORAP5ORAS5 | 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 |
| |
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 | 19801990-20102020 |
| Hindcast ensemble size | 10 |
| On-the-fly or static hindcast set? | static |