The New Operational of Indonesian Ocean Forecast System based on High Resolution Couple Atmosphere-Wave-Ocean Model (InaCAWO)

InaCAWO is a new part of the Indonesian Ocean Forecast System (BMKG-OFS) that was developed by the Indonesian Agency for Meteorology, Climatology, and Geophysics in collaboration with NC State University and Baron Weather in 2023. BMKG-OFS has been operated since 2004 to provide marine weather predictions and ocean modeling, especially for the Indonesian sea area, continuously and in real-time conditions. In earlier stages, BMKG-OFS used wave modeling (Windwave-05, Wavewatch-III) with atmospheric modeling (WRF, GFS) as a forcing, separately. Couple modeling in these stages has the purpose of creating simulations with more accurate and realistic conditions. The InacaWO model is built upon the COAWST model. It includes the regional oceanic model (ROMS), the atmospheric model (WRF), and the Simulating Wave Nearshore (SWAN) model. The system is linked to the Model Coupling Toolkit (MCT), a compilation of information modeling procedures. The spatial and temporal resolution of the model InaCAWO is approximately 3 km, with an hourly timestep, a 2036 x 1116 grid, and 70 vertical layers. ECMWF is used for initial and boundary conditions in atmospheric modeling, while MERCATOR is used for ocean modeling. The atmospheric parameters of InacaWO have been evaluated using mean sea level, surface wind speed, and daily precipitation based on synoptic observations over a period of one year, despite the evaluation of ocean parameters based on satellite and drifter observations. The result indicates that the model's accuracy with contingency methods for all parameters is approximately 80%. InaCAWO is also capable of capturing a variety of unique Indonesian phenomena, such as the mixing process in Indonesian Throughflow with T-S Diagram, Eddy Circulations, Flow Intensifications in Narrow Straits, and Freshwater Discharge