Intercomparison of the In-situ and Remote Ozone Measurements During the Summer of 2023 Coastal Urban Plume Dynamics Study (CUPiDS)

Multiple instruments aboard aircraft, ground-based ozone lidars and ozonesondes measured tropospheric ozone (O₃) during the Summer 2023 AGES+ campaigns. This work specifically focuses on platforms that overlapped with the NOAA Twin Otter and NASA DC-8 aircraft in New York City, NY as a part of the Coastal Urban Plume Dynamics Study (CUPiDS) campaign. The first goal of this work is to identify days and time when we would expect the O₃ measurements to be in agreement. This includes considering several factors, including the spatial and temporal overlap, the vertical and horizontal resolution of the lidar measurements, the flight tracks of the aircraft and their respective time spent over water versus over land when within the range of the other measurements, the drift of the sondes with wind, and integration time of the aircraft and lidar data relative to the sonde launch times.

After determining any biases in the intercomparisons, the second goal of this work is to use the combination of all the O₃ data to determine spatial and temporal trends over and along the Long Island Sound during the campaign. This includes relating the observed O₃ values relative to factors such as the meteorology (wind direction, pressure systems, atmospheric layers), spatial patterns (movement of a plume over the Long Island Sound), anthropogenic activity (weekend vs. weekday effects and how the secondary ozone formation relates to peak traffic hours), and the influence of smoke shading from wildfires.