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| title | WORK IN PROGRESS... |
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Identifier code: JMA/MRI-CPS3CPS4
First operational forecast run: February 2022 January 2026
2. Configuration of the forecast model
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| Model | JMA-GSM |
|---|---|
| Horizontal resolution and grid | TL319 (approx. 55km) |
| Atmosphere vertical resolution | L100L128 |
| Top of atmosphere | 0.01hPa |
| Soil levels (layers) | 7 Layer 1 : 0 - 0.02 m |
| Time step | 20 minutes |
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2.2 Ocean and cryosphere
| Ocean model | MRI.COM v4v5.60 |
|---|---|
| Horizontal resolution | 0.25ºx0.25º on a tripolar grid |
| Vertical resolution | L60 |
| Time step | 10 minutes |
| Sea ice model | part of MRI.COM v4v5.60 |
| 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:
TsujinoSakamoto, HK., H. Nakano, KS. SakamotoUrakawa, ST. UrakawaToyoda, MY. HirabaraKawakami, H. IshizakiTsujino, and G. Yamanaka, 20172023: Reference manual for the Meteorological Re-search Research Institute Community Ocean Model version 4 5 (MRI.COMv4COMv5). Tech. Rep. MRI, 80.87
3. Initialization and initial condition (IC) perturbations
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| Hindcast | Forecast | ||
|---|---|---|---|
| Atmosphere initialization | Japanese Reanalysis for Three Quarters of a Century (JRA-3Q) | Global Analysis (GA) | |
| Atmosphere IC perturbations | Breeding Growth Method (BGM) | Singular Vectors (SV) | Singular Vectors (SV) and Local Ensemble Transform Kalman Filter (LETKFBreeding 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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Horizontal and vertical resolution of perturbations: TL319L100 TL319L128 (LETKF), TL63L40 (SV)
Perturbations in +/- pairs: Yes
Detailed documentation:
KobayashiKosaka, Y., S. Kobayashi, Y. Kosaka. Harada, C. Kobayashi, H. Naoe, K. Yoshimoto, M. Harada, N. Goto, J. Chiba, K. Miyaoka, R. Sekiguchi, M. Deushi, H. Kamahori, T. Nakaegawa; T. Y.Tanaka, T. Tokuhiro, Y. HaradaSato, CY. Kobayashi Matsushita, and HK. NaoeOnogi, 20212024: The JRA-3Q : Japanese Reanalysis for Three Quarters of a Century. WCRP-WWRP Symposium on Data Assimilation and Reanalysis/ECMWF annual seminar 2021reanalysis. J. Meteor. Soc. Japan, 102, 49–109.
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://dswww.data.jma.go.jp/tccwmc/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 and Stochastic Humidity Profile for Convective parameterization (SHPC) |
If there is a control forecast, is it perturbed? | YesNo |
Detailed documentation:
5. Forecast system and hindcasts
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7. Where to find more information
General information:
https://dswww.data.jma.go.jp/tcc/tccwmc/products/model/outline/cps3cps_description.html
https://dswww.data.jma.go.jp/tccwmc/tcc/products/elnino/move_mricom-g3_doc.html