1. Forecast system version
Identifier code: JMA/MRI-CPS3
First operational forecast run: February 2022
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 | TL319 (approx. 55km) |
Atmosphere vertical resolution | L100 |
Top of atmosphere | 0.01hPa |
Soil levels (layers) | 7 Layer 1 : 0 - 0.02 m |
Time step | 20 minutes |
Detailed documentation:
JMA, 2019: Outline of the operational numerical weather prediction at the Japan Meteorological Agency. Appendix to WMO Technical Progress Report on the Global Data-processing and Forecasting System and Numerical Weather Prediction Research. Appendix to WMO Technical Progress Report on the Global Data-processing and Forecasting System and Numerical Weather Prediction, Tokyo, Japan.
2.2 Ocean and cryosphere
Ocean model | MRI.COM v4.6 |
---|---|
Horizontal resolution | 0.25ºx0.25º on a tripolar grid |
Vertical resolution | L60 |
Time step | 10 minutes |
Sea ice model | part of MRI.COM v4.6 |
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, H., H. Nakano, K. Sakamoto, S. Urakawa, M. Hirabara, H. Ishizaki, and G. Yamanaka, 2017: Reference manual for the Meteorological Re-search Institute Community Ocean Model version 4 (MRI.COMv4). Tech. Rep. MRI, 80.
3. Initialization and initial condition (IC) perturbations
3.1 Atmosphere and land
Hindcast | Forecast | |
---|---|---|
Atmosphere initialization | Japanese Reanalysis for Three Quarters of a Century (JRA-3Q) | Global Analysis (GA) |
Atmosphere IC perturbations | Breeding Growth Method (BGM) | Breeding Growth Method (BGM) |
Land Initialization | Offline model runs forced by JRA-3Q | Offline model runs forced by JRA-3Q and GA |
Land IC perturbations | None | None |
Soil moisture initialization | Offline model runs forced by JRA-3Q | Offline model runs forced by JRA-3Q and GA |
Snow initialization | Offline model runs forced by JRA-3Q | Offline model runs forced by JRA-3Q and GA |
Unperturbed control forecast? | Yes | Yes |
Data assimilation method for control analysis: 4D-VAR
Horizontal and vertical resolution of perturbations: TL319L100
Perturbations in +/- pairs: Yes
3.2 Ocean and cryosphere
Hindcast | Forecast | |
---|---|---|
Ocean initialization | Multivariate Ocean Variational Estimation (MOVE)/MRI.COM Global 3 system (MOVE/MRI.COM-G3) | Multivariate Ocean Variational Estimation (MOVE)/MRI.COM Global 3 system (MOVE/MRI.COM-G3) |
Ocean IC perturbations | Ensemble perturbations approximating analysis error covariances using minimization histories | Ensemble perturbations approximating analysis error covariances using minimization histories |
Unperturbed control forecast? | Yes | Yes |
Detailed documentation:
https://ds.data.jma.go.jp/tcc/tcc/products/elnino/move_mricom-g3_doc.html
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:
5. Forecast system and hindcasts
Forecast frequency | daily |
---|---|
Forecast ensemble size | 5 per day |
Hindcast years | 1991-2020 |
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:
https://ds.data.jma.go.jp/tcc/tcc/products/model/outline/cps3_description.html
https://ds.data.jma.go.jp/tcc/tcc/products/elnino/move_mricom-g3_doc.html