Abstract: Five observing system experiments have been performed with the Air Force Geophysics Laboratory (AFGL) global data assimilation system (GDAS). Each experiment includes one week of data assimilation during each of the two ...

Abstract: Four-dimensional variational data assimilation (4DVAR) is an established data assimilation method that finds the finite-amplitude perturbation that best fits observations consistent with a priori information and model ...