China's SO₂ emission reductions enhance atmospheric ozone-driven sulfate aerosol production in East Asia.

ABSTRACT: Reduction of China's SO₂ emissions has been found to nonlinearly decrease the atmospheric sulfate (SO₄^2-) aerosol concentrations in East Asia. Compared to Europe and North America, the lower effectiveness of SO₄^2- reduction in East Asia suggested much effects of "acidity-sensitive" feedback mechanisms in this high anthropogenic emission region, which have not been yet examined. In this work, we investigated these feedback mechanisms in East Asia through long-term measurements of the mass-independent oxygen-17 anomaly (Δ¹⁷O) in sulfate aerosols, machine learning and Community Multiscale Air Quality (CMAQ) model. As China's emissions reduced, the atmospheric acidity decreased, enhancing the ozone-driven oxidation of S(IV) and

SUBMITTER: Lin YC 

PROVIDER: S-EPMC12184437 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature