An update on the 4D-LETKF data assimilation system for

filter4dEnsemble Kalman filteringwas developed as away to assimilate observed data to track the current state in a computational model. In this paper we showthat the ensemble approach makesSynonyms for FILTERED: purified, pure, undiluted, refined, rendered, unadulterated, clarified, uncontaminated; Antonyms of FILTERED: mixed, diluted, contaminated