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title | WORK IN PROGRESS... |
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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 |
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Horizontal resolution and grid | TL319 (approx. 55km) |
Atmosphere vertical resolution | L100 |
Top of atmosphere | 0.01hPa |
Soil levels | 7 Level 1 : 0 - 0.02 m Level 2 : 0.02 - 0.07 Level 3 : 0.07 – 0.19 m Level 4 : 0.19 – 0.49 m Level 5 : 0.49 – 0.99 m Level 6 : 0.99 – 1.99 m Level 7 : 1.99 – 3.49 m |
Time step | 20 minutes |
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2.2 Ocean and cryosphere
Ocean model | MRI.COM v4.6 |
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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 |
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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 | |
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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 |
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3.2 Ocean and cryosphere
Hindcast | Forecast | |
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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 Ensemble perturbations approximating analysis error covariances using minimization historiesensemble | Ensemble perturbations approximating analysis error covariances using minimization histories |
Unperturbed control forecast? | Yes | Yes |
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https://ds.data.jma.go.jp/tcc/tcc/products/elnino/move_mricom-g3_doc.html
4. Model Uncertainties perturbations:
Model dynamics perturbations | None |
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Model physics perturbations | Stochastically Perturbed Parametrization Tendencies (SPPT) scheme |
If there is a control forecast, is it perturbed? | Yes |
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5. Forecast system and hindcasts
Forecast frequency | daily |
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Forecast ensemble size | 5 per day |
Hindcast years | 1993-2016 |
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 |
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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
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