Multi-scale, Multi-platform Greenhouse Gas Observations from Summer 2024 Field Campaigns in Salt Lake City: What can we learn from one of the densest greenhouse gas data collection efforts in an urban area?

A remarkable confluence of research activities took place over Summer 2024 in the Salt Lake urban area, motivated by efforts to understand sources of GHGs (CO₂, CH₄) and to provide insights for reducing tropospheric ozone levels. In addition to the existing network of in-situ GHG sites and light rail-based public transit sampling, the NOAA Twin Otter carried out three-dimensional sampling in the atmosphere, along with three mobile laboratories from the University of Wyoming, NOAA Chemical Sciences Laboratory, and NOAA Air Resources Laboratory. These platforms were augmented by open-path dual-comb spectrometers, multiple ground-based atmospheric column observations (EM-27s), and space-based remote sensing (MethaneSAT, OCO-2/-3). These multi-scale GHG observations—often coupled with air quality measurements—constitute what is likely the densest array of observations in an urban area, to date. We will provide a first look at how these unprecedented data elucidate GHG sources within the Salt Lake urban area at multiple scales.