Isoprene photo-oxidation products quantify the effect of pollution on hydroxyl radicals over Amazonia.

ABSTRACT: Nitrogen oxides (NO _x ) emitted from human activities are believed to regulate the atmospheric oxidation capacity of the troposphere. However, observational evidence is limited for the low-to-median NO _x concentrations prevalent outside of polluted regions. Directly measuring oxidation capacity, represented primarily by hydroxyl radicals (OH), is challenging, and the span in NO _x concentrations at a single observation site is often not wide. Concentrations of isoprene and its photo-oxidation products were used to infer the equivalent noontime OH concentrations. The fetch at an observation site in central Amazonia experienced varied contributions from background regional air, urban pollution, and biomass burning. The afternoon concentrat

SUBMITTER: Liu Y 

PROVIDER: S-EPMC5895449 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature