| Autor: |
Goldberg DL; Energy Systems Division , Argonne National Laboratory , Lemont , Illinois 60439 , United States.; Consortium for Advanced Science and Engineering , University of Chicago , Chicago , Illinois 60637 , United States.; Department of Environmental and Occupational Health , George Washington University , Washington , DC 20052 , United States., Lu Z; Energy Systems Division , Argonne National Laboratory , Lemont , Illinois 60439 , United States.; Consortium for Advanced Science and Engineering , University of Chicago , Chicago , Illinois 60637 , United States., Streets DG; Energy Systems Division , Argonne National Laboratory , Lemont , Illinois 60439 , United States.; Consortium for Advanced Science and Engineering , University of Chicago , Chicago , Illinois 60637 , United States., de Foy B; Department of Earth and Atmospheric Sciences , Saint Louis University , St. Louis , Missouri 63108 , United States., Griffin D; Air Quality Research Division , Environment and Climate Change Canada , Toronto , Ontario M3H 5T4 , Canada., McLinden CA; Air Quality Research Division , Environment and Climate Change Canada , Toronto , Ontario M3H 5T4 , Canada., Lamsal LN; University Space Research Association, Goddard Earth Sciences Technology and Research (GESTAR) , Columbia , Maryland 21046 , United States.; NASA Goddard Space Flight Center , Greenbelt , Maryland 20770 , United States., Krotkov NA; NASA Goddard Space Flight Center , Greenbelt , Maryland 20770 , United States., Eskes H; Royal Netherlands Meteorological Institute (KNMI) , De Bilt 3730 AE , The Netherlands. |
| Abstrakt: |
The TROPOspheric Monitoring Instrument (TROPOMI) is used to derive top-down NO X emissions for two large power plants and three megacities in North America. We first re-process the vertical column NO 2 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 NO X emissions agree to within 10% of the emissions reported by the power plants. We then derive top-down NO X emissions rates for New York City, Chicago, and Toronto, and compare them to projected bottom-up emissions inventories. In this analysis of 2018 NO X 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 NO X 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 NO X 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 NO X emissions from relatively small sources and for sub-seasonal timeframes. |
