Development of the KIOST regional ocean prediction system : OPEM (Ocean Predictability Experiment for Marine environment)

Abstract

KIOST (Korea Institute of Ocean Science and Technology) has developed the regional ocean prediction system over the Northwestern Pacific called OPEM (Ocean Predictability Experiment for Marine environment). The base model is the GFDL MOM5 (Modular Ocean Model Version 5). The horizontal domain of the KIOST-OPEM is ranging from 98 to 170°E and from 5 to 65°N including the Northwestern Pacific and Korean marginal seas with 1/24° grid size both latitudinal and longitudinal. The vertical grid has 51 layers with varying grid size from 10 m at the surface to 367 m near the bottom. The KIOST-OPEM is forced by daily open boundary conditions from the Operational Mercator global ocean analysis and forecast data (Ferry et al, 2007) and meteorological surface forcing taken from the global weather model of the Korea Meteorological Agency. Also, climatological river discharges of 40 rivers taken from RivDIS have been injected into the ocean grid.The Data Assimilation System of the KIOST (DASK Kim et al., 2015) has been developed based on the Ensemble Optimal Interpolation (EnOI). The initial data of the KIOST-OPEM is generated by the DASK assimilating the satellite-borne Sea Surface Temperature (NCDC OISST) and hydrographic profiles taken from various sources. Since 1st of March, 2017, the KIOST-OPEM has been operated to forecast 10-days ocean circulation over the domain every Wednesday. Various analyses have been performedModular Ocean Model Version 5). The horizontal domain of the KIOST-OPEM is ranging from 98 to 170°E and from 5 to 65°N including the Northwestern Pacific and Korean marginal seas with 1/24° grid size both latitudinal and longitudinal. The vertical grid has 51 layers with varying grid size from 10 m at the surface to 367 m near the bottom. The KIOST-OPEM is forced by daily open boundary conditions from the Operational Mercator global ocean analysis and forecast data (Ferry et al, 2007) and meteorological surface forcing taken from the global weather model of the Korea Meteorological Agency. Also, climatological river discharges of 40 rivers taken from RivDIS have been injected into the ocean grid.The Data Assimilation System of the KIOST (DASK Kim et al., 2015) has been developed based on the Ensemble Optimal Interpolation (EnOI). The initial data of the KIOST-OPEM is generated by the DASK assimilating the satellite-borne Sea Surface Temperature (NCDC OISST) and hydrographic profiles taken from various sources. Since 1st of March, 2017, the KIOST-OPEM has been operated to forecast 10-days ocean circulation over the domain every Wednesday. Various analyses have been performed