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Toward the Development of a Coupled COAMPS-ROMS Ensemble Kalman Filter and Adjoint with a focus on the Indian Ocean and the Intraseasonal Oscillation

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Technical Report

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University of California Santa Cruz Santa Cruz United States

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LONG-TERM GOALS.The long-term goals of this research project are to 1. Develop a regional coupled ocean-atmosphere model comprising the Navys CoupledOceanAtmosphere Mesoscale Prediction System COAMPS and the Regional OceanModeling System ROMS. 2. Explore data assimilation strategies in regional coupled ocean-atmosphere models with aspecific focus on air-sea interaction in the tropical Indian Ocean. OBJECTIVES.The project has the following objectives1 Interface ROMS and COAMPS with the Data Assimilation Research Testbed DARTsystem at NCAR.2 Compare the performance of the Ensemble Kalman Filter EnKF using the DataAssimilation Research Testbed DART and 4-dimensional variational 4D-Var approaches todata assimilation in ocean only and atmosphere only experiments.3 Develop a coupled model capability based on the pre-existing COAMPS and ROMS systemsusing the Earth System Modeling Framework ESMF. 4 Investigate the merits of the EnKF approach for assimilating data into a coupled model,particularly in the highly dynamic tropical Indian Ocean where air-sea interactions play afundamental role shaping the monsoon circulation.

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