1. Forecast system version
Identifier code: JMA/MRI-CPS2
First operational forecast run: June 2015
2. Configuration of the forecast model
Is the model coupled to an ocean model? Yes
Coupling frequency: 1 hour
2.1 Atmosphere and land surface
| Model | JMA-GSM |
|---|---|
| Horizontal resolution and grid | TL159 (approx. 110km) |
| Atmosphere vertical resolution | L60 |
| Top of atmosphere | 0.1hPa |
| Soil levels | 3 |
| Time step | 30 minutes |
Detailed documentation: JMA, 2013
2.2 Ocean and cryosphere
| Ocean model | MRI.COM v3 |
|---|---|
| Horizontal resolution | 1ºx0.3º -0.5º on a tripolar grid |
| Vertical resolution | L52 + Bottom Boundary Layer (BBL) |
| Time step | 20 minutes |
| Sea ice model | part of MRI.COM v3 |
| Sea ice model resolution | same as ocean model |
| Sea ice model levels | 5 categories + open water |
| Wave model | None |
| Wave model resolution | N/A |
Detailed documentation: Tsujino et al., 2010
3. Initialization and initial condition (IC) perturbations
3.1 Atmosphere and land
| Hindcast | Forecast | |
|---|---|---|
| Atmosphere initialization | Japanese 55-year Reanalysis (JRA-55) | Japanese 55-year Reanalysis (JRA-55) |
| Atmosphere IC perturbations | Breeding Growth Method (BGM) | Breeding Growth Method (BGM) |
Land Initialization | JRA-55 | JRA-55 |
| Land IC perturbations | None | None |
| Soil moisture initialization | JRA-55 | JRA-55 |
| Snow initialization | JRA-55 | JRA-55 |
| Unperturbed control forecast? | None | None |
Data assimilation method for control analysis: 4D-VAR (atmosphere) and 3D-VAR (ocean)
Horizontal and vertical resolution of perturbations: TL159L60
Perturbations in +/- pairs: Yes
Detailed documentation: Kobayashi et al., 2015
3.2 Ocean and cryosphere
| Hindcast | Forecast | |
|---|---|---|
| Ocean initialization | Multivariate Ocean Variational Estimation (MOVE)/MRI.COM Global 2 system (MOVE/MRI.COM-G2) | Multivariate Ocean Variational Estimation (MOVE)/MRI.COM Global 2 system (MOVE/MRI.COM-G2) |
| Ocean IC perturbations | MOVE/MRI-COM-G2 driven by JRA-55 with BGM perturbation | MOVE/MRI-COM-G2 driven by JRA-55 with BGM perturbation |
| Unperturbed control forecast? | None | None |
Detailed documentation: Toyoda et al., 2011
4. Model Uncertainties perturbations:
| Model dynamics perturbations | None |
|---|---|
| Model physics perturbations | Stochastically Perturbed Parametrization Tendencies (SPPT) scheme |
If there is a control forecast, is it perturbed? | Yes |
Detailed documentation: Yonehara and Ujiie, 2011
5. Forecast system and hindcasts
| Forecast frequency | Every 5 days |
|---|---|
| Forecast ensemble size | 13 |
| Hindcast years | 1981-2016 |
| Hindcast ensemble size | 10 (5 members with 15-day Lagged Average Forecast) |
| On-the-fly or static hindcast set? | static |
6. Other relevant information
The available hindcast start dates are as follows:
Start Month | Available Start Days |
January | 16 and 31 |
February | 10 and 25 |
March | 12 and 27 |
April | 11 and 26 |
May | 16 and 31 |
June | 15 and 30 |
July | 15 and 30 |
August | 14 and 29 |
September | 13 and 28 |
October | 13 and 28 |
November | 12 and 27 |
December | 12 and 27 |
7. Where to find more information
General information:
