Hybrid Mass Balance/4D-Var Joint Inversion of NO _x and SO₂ Emissions in East Asia.

ABSTRACT: Accurate estimates of NO _x and SO₂ emissions are important for air quality modeling and management. To incorporate chemical interactions of the two species in emission estimates, we develop a joint hybrid inversion framework to estimate their emissions in China and India (2005-2012). Pseudo observation tests and posterior evaluation with surface measurements demonstrate that joint assimilation of SO₂ and NO₂ can provide more accurate constraints on emissions than single-species inversions. This occurs through synergistic change of O₃ and OH concentrations, particularly in conditions where satellite retrievals of the species being optimized have large uncertainties. The percentage changes of joint posterior emissions from the sin

SUBMITTER: Qu Z 

PROVIDER: S-EPMC6853212 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature