Enhanced Capabilities of TROPOMI NO2: Estimating NOX from North American Cities and Power Plants
by D.L. Goldberg (Argonne National Laboratory, IL, USA), Z. Lu (Argonne National Laboratory, IL, USA), D.G. Streets (Argonne National Laboratory, IL, USA), B. de Foy (Saint Louis University, MO, USA), D. Griffin (ECCC, Toronto, Canada)C.A. McLinden (ECCC, Toronto, Canada)L.N. Lamsal (NASA-GSFC, Greenbelt, MD, USA)N.A. Krotkov (NASA-GSFC, Greenbelt, MD, USA)H. Eskes (KNMI)
The TROPOspheric Monitoring Instrument (TROPOMI) is used to derive top-down NOX emissions for two large power plants and three megacities in North America. We first re-process the vertical column NO2 with an improved air mass factor to correct for a known systematic low bias in the operational retrieval near urban centers. For the two power plants, top-down NOX emissions agree to within 10% of the emissions reported by the power plants. We then derive top-down NOX emissions rates for New York City, Chicago, and Toronto, and compare them to projected bottom-up emissions inventories. In this analysis of 2018 NOX emissions, we find a +22% overestimate for New York City, a −21% underestimate in Toronto, and good agreement in Chicago in the projected bottom-up inventories when compared to the top-down emissions. Top-down NOX emissions also capture intraseasonal variability, such as the weekday versus weekend effect (emissions are +45% larger on weekdays versus weekends in Chicago). Finally, we demonstrate the enhanced capabilities of TROPOMI, which allow us to derive a NOX emissions rate for Chicago using a single overpass on July 7, 2018. The large signal-to-noise ratio of TROPOMI is well-suited for estimating NOX emissions from relatively small sources and for sub-seasonal timeframes.
Goldberg, D.L., Z. Lu, D.G. Streets, B. de Foy, D. Griffin, C.A. McLinden, L.N. Lamsal, N.A. Krotkov and H. Eskes, Enhanced Capabilities of TROPOMI NO2: Estimating NOX from North American Cities and Power Plants