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welcome to the talk on nudging this is also known as four-dimensional data simulation itamp;#39;s a method of nudging the model towards observations or analyses there are three applications i will show here one is dynamical initialization where you nudge for a pre-forecast period one is creating a four-dimensional meteorological data set for example for air quality modeling and one is for boundary conditions where you nudge an outer domain towards an analysis when fdda is activated the model is run with extra nudging terms for horizontal winds temperature and water vapor in analysis nudging these terms now to point by point to a 3d space and time interpolated analysis field in obs nudging points near the observations are nudged based on the model error at the observation site the nudging is a relaxation term with a user-defined time scale around an hour or more and the nudging also works with nesting restarts first application iamp;#39;ll mention is dynamical initialization the model