Real Time Ocean-Sea Ice coupled Three Dimensional Variational Global Data Assimilation at National Centers for Environmental Prediction.

Zulema D Garraffo1, James A Cummings1, Hae-Cheol Kim1, Shastri Paturi2, Yan Hao1, Todd D Spindler1, Dan Iredell1, Ilya Rivin3 and Avichal Mehra4, (1)IMSG at NOAA/NWS/NCEP/EMC, College Park, MD, United States, (2)IMSG/NOAA-NCEP-EMC, College Park, MD, United States, (3)NOAA/NOS/CO-OPS, Silver Spring, MD, United States, (4)NOAA/NWS/NCEP/EMC, College Park, MD, United States
Real time analysis and forecasts for ocean and sea ice are being produced at NCEP as a pre-operational product. The system consists of a 1/12° global model configuration with the Hybrid Coordinates Ocean Model and Los Alamos CICE (HYCOM-CICE), and three-dimentional variational data assimilation with the NCEP setup and version of the Navy Coupled Ocean Data Assimilation (NCODA) system. The system includes quality control, analysis and data impact. A simulation was started at the end of May 2019, which incorporated new observational systems as the simulation progressed. A pre-operational simulation with stable observational systems has been started from August 2019. Observations assimilated include ADT SSH, satellite SST, satellite SSS, satellite ice coverage, insitu SST, SSS, profiles, drifter-derived velocities. Quality control, system verification and results are discussed.