Aerosol Uptake Coefficients of Isoprene Epoxides: Determination and Parameter Estimation from Online Field Measurements of Organic Molecular Markers.

ABSTRACT: This study introduces a new approach that combines online field measurements and photochemical box modeling to estimate summer daytime heterogeneous reaction rates (k_het) and uptake coefficients (γ) for isoprene epoxydiols (IEPOX) and hydroxymethyl-methyl-α-lactone (HMML)/methacrylic acid epoxide (MAE) under ambient conditions. The k_het and γ values are highly acidity-dependent. For IEPOX, γ increases from (2.1 ± 1.5) × 10^-3 under pH > 4 to (6.7 ± 6.0) × 10^-3 under pH < 2, and k_het increases from (2.2 ± 1.3) × 10^-5 under pH > 4 to (7.3 ± 6.7) × 10^-5 under pH < 2. For HMML/MAE, γ increases from (2.2 ± 1.9) × 10^-5 under pH > 4 to (1.3 ± 1.1) × 10^-4 under pH < 2, and k

SUBMITTER: Zhu S 

PROVIDER: S-EPMC12409889 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature