EFSOI applied to regional data assimilation system over southern South America

Abstract

EFSOI is a formulation applied to quantify the contribution of each observation assimilated at the time t=0 to the reduction (or increase) of the error of the forecast time t hours later(evaluation forecast time). As shown in the conceptual diagram the impact of assimilating an observation (y0 ) at t=0 is quantified by the difference of two forecast errors at the evaluation forecast time.