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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

ModelGEM
Horizontal resolution and grid

256×128 grid points (~155 km)

Atmosphere vertical resolution79 levels
Top of atmosphere0.075 hPa
Soil levels2
Time step60 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 modelNEMO
Horizontal resolution1°×1° (1/3 degree meridionally near the equator)
Vertical resolution50 levels
Time step30 minutes
Sea ice modelCICE
Sea ice model resolutionSame as NEMO
Sea ice model levels5 ice-thickness categories
Wave modelN/A
Wave model resolutionN/A

Detailed documentation:

3. Initialization and initial condition (IC) perturbations

3.1 Atmosphere and land


HindcastForecast
Atmosphere initialization
ERA-interimGEPS
Atmosphere IC perturbationsRandom isotropic perturbationsEnsemble Kalman Filter

Land Initialization

Off-line Surface Prediction System (SPS)

forced by ERA-interim

SPS forced by the CCMEP analysis
Land IC perturbationsNoneNone
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?nonenone

Data assimilation method for control analysis: 

Horizontal and vertical resolution of perturbations:  

Perturbations in +/- pairs: 

Detailed documentation:

3.2 Ocean and cryosphere


HindcastForecast
Ocean initializationORAP5CCMEP GIOPS analysis
Ocean IC perturbationsNoneNone
Unperturbed control forecast?NoneNone

Detailed documentation:


4. Model Uncertainties perturbations:

Model dynamics perturbationsNone
Model physics perturbationsimplicit 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 frequencyonce a month
Forecast ensemble size10
Hindcast years1980-2010
Hindcast ensemble size10
On-the-fly or static hindcast set?static

6. Other relevant information

7. Where to find more information



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