May 19, 2004 Observation System Simulation Experiment OSSE is a configuration to simulate running an deterministic ensemble Kalman filter on a rotating tank with an ice bucket at the center. code/ contains the modifications to MITgcm to run in cyclindrical coordinates. At the time of this writing, it requires checkpoint48 to compile and run. EnKF/ contains the source and data files to run the Kalman filter.