Observations from the Scanning High-Resolution Interferometer Sounder (S-HIS) during the Atmospheric Emissions and Reactions Observed from Megacities to Marine Areas (AEROMMA) Campaign

The Atmospheric Emissions and Reactions Observed from Megacities to Marine Areas (AEROMMA) is a comprehensive study led by NOAA's Chemical Sciences Laboratory investigating anthropogenic and marine emissions that alter tropospheric composition and impact air quality and climate over North America. The AEROMMA field campaign brings together airborne, ground, and satellite observing systems, and state-of-the-art air quality and climate models, to investigate emerging research needs in urban air quality, atmospheric interactions at the marine-urban interface, marine emissions, satellite-based observations of atmospheric composition, and climate change. Additionally, the AEROMMA observations will be highly useful for evaluating the NASA TEMPO and NOAA JPSS trace gas and aerosol products and can be used to inform the future NOAA GeoXO constellation.

The Scanning High-resolution Interferometer Sounder (S-HIS), as part of the AEROMMA NASA DC-8 payload, provided radiance measurements of upwelling atmospheric emitted radiation between 580 cm^-1 and 2800 cm^-1 at approximately 0.5 cm^-1 spectral resolution. The S-HIS radiance measurements can be used to derive profiles of atmospheric temperature and water vapor, and are sensitive to the presence of trace gases with radiative absorption or emission lines within this spectral region. While high spectral resolution infrared sounder retrievals typically utilize the carbon dioxide absorption band for temperature sounding, many other trace gases important for photochemistry are present in this dataset as well. In addition to carbon dioxide, methane, sulfur dioxide, nitrous oxide, carbon monoxide and ozone are all major absorbers in this thermal infrared region. Given the very accurate calibration of the S-HIS, gases of smaller concentrations, such as isoprene and ammonia, are also expected to be detectable in these radiance measurements.

This presentation will summarize the preliminary S-HIS observations and retrievals from the AEROMMA campaign, the spectral signatures of trace gases within the S-HIS spectral range and the sensitivity of the S-HIS to those gases, and outline planned analyses.