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 | Soil temperature : 1 Soil moisture : 3 |
Time step | 30 minutes |
2.2 Ocean and cryosphere
Ocean model | MRI.COM v3 |
---|---|
Horizontal resolution | 1ºx0.3º -0.5º on a tripolar grid (See Toyoda et al. 2013 for more information 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 |
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
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 T., Y. Fujii, T. Yasuda, N. Usui, T. Iwao, T. Kuragano, and M. Kamachi, 2013: Improved analysis of seasonal-interannual fields using a global ocean data assimilation system. Theor Appl Mech Jpn, 61, 31-48.
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, H. and M. Ujiie, 2011: A stochastic physics scheme for model uncertainties in the JMA one-week ensemble prediction system. CAS/JSC WGNE Res. Act. Atmos. Ocean Model/WMO, 41, 6.09–6.10.
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 start dates are as follows:
(NOTE: hindcasts are just available for dates highlighted in bold and underlined)
Start Month | Available Start Days |
---|---|
January | 1, 6, 11, 16, 21, 26 and 31 |
February | 5, 10, 15, 20 and 25 |
March | 2, 7, 12, 17, 22 and 27 |
April | 1, 6, 11, 16, 21 and 26 |
May | 1, 6, 11, 16, 21, 26 and 31 |
June | 5, 10, 15, 20, 25 and 30 |
July | 5, 10, 15, 20, 25 and 30 |
August | 4, 9, 14, 19, 24 and 29 |
September | 3, 8, 13, 18, 23 and 28 |
October | 3, 8, 13, 18, 23 and 28 |
November | 2, 7, 12, 17, 22 and 27 |
December | 2, 7, 12, 17, 22 and 27 |
7. Where to find more information
General information: