1/12-degree regional MOM6 analysis using Marine JEDI

A three-dimensional variational data assimilation (3DVar DA) scheme has been established using Joint Efforts for Data Assimilation Integration (JEDI) - Sea-ice Ocean and Coupled Assimilation (SOCA) by integrating to Modular Ocean Model version 6 (MOM6), namely Marine JEDI. This work is motivated to provide more realistic initial conditions for the ocean model component of next-generation, operational coupled Hurricane Analysis and Forecast System (HAFS). The ocean model is configured to resolve mesoscale features at a resolution of 1/12-degree and 55 z* vertical layers over the north Atlantic basin. In this presentation, we briefly introduce the DA setup, and the results of sensitivity experiments for correlation length scales and background error variance, followed by the preliminary results from the investigation of analysis. The presentations include comparisons of two sets of 1-year analysis, using two 3DVar approaches - BUMP3D and Explicit Diffusive operator, with special attention on the ocean conditions of the upper layer for the hurricane Fiona and Ian periods in 2022.