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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 |
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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 |
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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 |
Detailed documentation: Tsujino et al., 2010, H., T. Motoi, I. Ishikawa, M. Hirabara, H. Nakano, G. Yamanaka, T. Yasuda, and H. Ishizaki, 2010: Reference manual for the Meteorological Research Institute Community Ocean Model (MRI.COM) version 3. Technical Reports of the Meteorological Research Institute, 59, 273pp.
3. Initialization and initial condition (IC) perturbations
3.1 Atmosphere and land
Hindcast | Forecast | |
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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 |
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Perturbations in +/- pairs: Yes
Detailed documentation: Kobayashi et al., 2015Kobayashi, S., Y. Ota, Y. Harada, A. Ebita, M. Moriya, H. Onoda, K. Onogi, H. Kamahori, C. Kobayashi, H. Endo, K. Miyaoka, and K. Takahashi, 2015: The JRA-55 reanalysis: General specifications and basic characteristics. J. Meteor. Soc. Japan, 93, 5-48.
3.2 Ocean and cryosphere
Hindcast | Forecast | |
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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., 2011T., 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 |
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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 |
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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:
(NOTE: hindcasts are just available for dates highlighted in bold and underlined)
Start Month | Available Start Days |
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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:
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