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The CSS projects
Japan Seas
P7 - Monitoring and forecasting system of the ocean circulation off Rokkasho
The aim of the project is real-time monitoring and forecasting the current structure off the northeastern coast of Japan. The product of the system will be used for the tracking radionuclides released from a spent nuclear fuel reprocessing plant in Rokkasho village, Aomori Pref.
Area of interest - Rokkasho village (located at the northeastern tip of Honshu, Japan)
Project name, acronym
Monitoring and forecasting system of the ocean circulation off Rokkasho
Domain
Northwestern part of North Pacific (around Japan), northeastern coastal region of Japan
Objectives
Type:
Real-time monitoring and prediction
Operational objectives:
Tracking radionuclides released from a spent nuclear fuel reprocessing plant in Rokkasho village, Aomori Pref.
Downscaling strategy
2-level one-way nesting using data assimilation result of Northwestern part of North Pacific developed in Kyoto university (see detail in section 8.3) as the open-boundary condition. The middle model covers the region around Japan coast including Kuroshio-Oyashio system and Japan Sea, (128E-155E, 30N-50N) with 1/18 and 1/24 deg resolution. The region of the inner model is around the northern part of the Japan (141E-146E, 39N-44N). The resolution of the model is 1/54 and 1/72 deg. which corresponds about 2km.
Modelling strategy:
The numerical model commonly used in this project is the ocean general circulation model with sigma-z hybrid vertical coordinate developed in Kyoto University (Toyoda et al., 2004). ). The vertical levels are same for 3 models for convenience and stability for nesting technique, so those are determined as 78 levels in (4 m resolution in surface, 67 levels above 100m), which are enough to resolve the detailed topography for the coastal high-resolution model
Forcing:
NCEP reanalysis data for middle model. JMA meso-scale analysis data (MANAL) for inner model.
Project status
Testing
References
Toyoda, T., T. Awaji, Y. Ishikawa, and T. Nakamura, 2004: Preconditioning of winter mixed layer in the formation of North Pacific eastern subtropical mode water, Geophy. Res. Lett., L17206.
(Last Updated: 17-01-2008)