High-Resolution NO2 Observations from the Airborne Compact Atmospheric Mapper: Retrieval and Validation

摘要: Nitrogen dioxide (NO2) is a short-lived atmospheric pollutant that serves as an air quality indicator, and itself health concern. The Airborne Compact Atmospheric Mapper (ACAM) was flown on board the NASA UC-12 aircraft during DISCOVER-AQ Maryland field campaign in July 2011. instrument collected hyperspectral remote sensing measurements 304-910 nm range, allowing day-time observations of several tropospheric pollutants, including nitrogen (NO2), at unprecedented spatial resolution 1.5 × 1.1 km2. Retrievals slant column abundance are based Differential Optical Absorption Spectroscopy (DOAS) method. For Air Mass Factor (AMF) computations needed to convert these retrievals vertical abundance, we include high information for surface reflectivity by using bidirectional reflectance distribution function (BRDF) data from Moderate Resolution Imaging Spectroradiometer (MODIS). We use high-resolution simulated distributions NO2 Community Multiscale Quality (CMAQ) Global Modeling Initiative (GMI) models account temporal variation retrieve middle- lower-tropospheric columns (NO2 below aircraft). compare derived ACAM with in-situ NASA's P-3B research aircraft, total ground-based Pandora spectrometers, space-based OMI instrument. not only give new insights into our understanding composition chemistry through observation sub-sampling variability typical satellite model resolutions, but they also provide opportunities testing algorithm improvements forthcoming geostationary missions.