Preprints
https://doi.org/10.5194/acp-2022-474
https://doi.org/10.5194/acp-2022-474
 
28 Jul 2022
28 Jul 2022
Status: this preprint is currently under review for the journal ACP.

Estimating Enhancement Ratios of Nitrogen Dioxide, Carbon Monoxide, and Carbon Dioxide using Satellite Observations

Cameron G. MacDonald1,2,3, Joshua L. Laughner4, Jacob K. Hedelius5, Ray Nassar6, Jon-Paul Mastrogiacomo1, and Debra Wunch1 Cameron G. MacDonald et al.
  • 1University of Toronto, Department of Physics, Toronto, Ontario, Canada
  • 2University of Waterloo, Department of Physics and Astronomy, Waterloo, Ontario, Canada
  • 3Princeton University, Program in Atmospheric and Oceanic Sciences, Princeton, New Jersey, USA
  • 4Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
  • 5Space Dynamics Laboratory, Utah State University, North Logan, Utah, USA
  • 6Climate Research Division, Environment and Climate Change Canada, Toronto, Ontario, Canada

Abstract. Using co-located space-based measurements of carbon dioxide (CO2) from the Orbiting Carbon Observatory 2 and 3 (OCO-2/3) and carbon monoxide (CO) and nitrogen dioxide (NO2) from the Tropospheric Monitoring Instrument (TROPOMI), we calculate total column enhancements for observations influenced by anthropogenic emissions from urban regions relative to clean background values. We apply this method to observations taken over or downwind of 27 large (> 1 million population) urban areas from around the world. Enhancement ratios between species are calculated and compared to emission ratios derived from four globally gridded anthropogenic emission inventories. We find that these global inventories underestimate CO emissions in many North American and European cities relative to our observed enhancement ratios, while smaller differences were found for NO2 emissions. We further demonstrate that the calculation and intercomparison of enhancement ratios of multiple tracers can help to identify the underlying biases leading to disagreement between observations and inventories. Additionally, we use high-resolution CO2 inventories for two cities (Los Angeles and Indianapolis) to estimate emissions of CO and NO2 using our calculated enhancement ratios, and find good agreement with both a previous modelling study for the Los Angeles megacity and California Air Resource Board (CARB) inventory estimates.

Cameron G. MacDonald et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-474', Anonymous Referee #1, 12 Aug 2022
  • RC2: 'Comment on acp-2022-474', Anonymous Referee #2, 07 Nov 2022

Cameron G. MacDonald et al.

Data sets

TROPOMI v1 TROPOMI Science Team https://tropomi.gesdisc.eosdis.nasa.gov/data/S5P_TROPOMI_Level2/S5P_L2__CO____.1/

TROPOMI v1 TROPOMI Science Team https://tropomi.gesdisc.eosdis.nasa.gov/data/S5P_TROPOMI_Level2/S5P_L2__NO2____HiR.1/

OCO-2 Level 2 bias-corrected XCO2 and other select fields from the full-physics retrieval aggregated as daily files, Retrospective processing V9r OCO-2 Science Team/Michael Gunson, Annmarie Eldering https://disc.gsfc.nasa.gov/datasets/OCO2_L2_Lite_FP_9r/summary

OCO-3 Level 2 bias-corrected XCO2 and other select fields from the full-physics retrieval aggregated as daily files, Retrospective processing v10.4r OCO-2/OCO-3 Science Team, Abhishek Chatterjee, Vivienne Payne https://disc.gsfc.nasa.gov/datasets/OCO3_L2_Lite_FP_10.4r/summary

Cameron G. MacDonald et al.

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Short summary
We use three satellites measuring carbon dioxide (CO2), carbon monoxide (CO), and nitrogen dioxide (NO2) to calculate atmospheric enhancements of these gases from 27 urban areas. We calculate enhancement ratios between the species and compare those to ratios derived from four globally gridded anthropogenic emission inventories. We find that the global inventories generally underestimate CO emissions in many North American and European cities relative to our observed enhancement ratios.
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