High Resolution Observations for O3-NOx-VOCs Sensitivity Analysis: An Assessment of O3 Response during LISTOS and FIREX-AQ field campaigns

In this study, we use high-resolution observations of NO₂ and HCHO along with high-resolution simulations to investigate ozone production efficiency during the FIREX-AQ (Fire Influence on Regional to Global Environments and Air Quality) campaign (August, 2019) and the LISTOS (Long Island Sound Tropospheric Ozone Study) air quality campaign (July – August, 2018). We develop tropospheric NO₂ and HCHO column products from an airborne spectrometer (GEO-CAPE Airborne Simulator, GCAS) and use them for exploring their potential to improve our understanding of O₃-NO_x-VOC photochemistry. The retrieval algorithm is updated to include high-resolution a-priori information and accounts for the impact of aerosols in retrievals. We will discuss the retrieval approach, characterization of the impact of urban and biomass burning aerosols on NO₂ and HCHO retrievals, and validation of GCAS retrievals using independent observations. Using HCHO and NO₂ retrievals from GCAS and the TROPOspheric Monitoring Instrument (TROPOMI) satellite sensor, we investigate spatiotemporal variability in O₃ production efficiency in the two unique regimes. We supplement the analysis by using in-situ measurements and box modeling to quantify the variability in the transition between NO_x-limited and VOC-limited regimes.