Review of the Application of Ocean Data Assimilation and Data Fusion Techniques

This paper briefly introduces the application of data assimilation and data fusion techniques in ocean environment monitoring and forecasting, the status of related operational ocean analysis and forecast systems, and the development trend of future operational application of ocean data assimilation. Four-dimensional variation analysis and ensemble Kalman filter are emerging as the main tools of ocean dynamic environment analysis and forecast across the world. Oceanic and atmospheric coupled data assimilation and sea ice data assimilation are two hot topics in ocean data assimilation research.