Inferring Changes in Summertime Surface Ozone-NO_x-VOC Chemistry over U.S. Urban Areas from Two Decades of Satellite and Ground-Based Observations.

ABSTRACT: Urban ozone (O₃) formation can be limited by NO_x, VOCs, or both, complicating the design of effective O₃ abatement plans. A satellite-retrieved ratio of formaldehyde to NO₂ (HCHO/NO₂), developed from theory and modeling, has previously been used to indicate O₃ formation chemistry. Here, we connect this space-based indicator to spatiotemporal variations in O₃ recorded by on-the-ground monitors over major U.S. cities. High-O₃ events vary nonlinearly with OMI HCHO and NO₂, and the transition from VOC-limited to NO_x-limited O₃ formation regimes occurs at higher HCHO/NO₂ value (3 to 4) than previously determined from models, with slight intercity vari

SUBMITTER: Jin X 

PROVIDER: S-EPMC7996126 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature