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Preprints
https://doi.org/10.5194/acp-2020-238
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-238
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 07 Apr 2020

Submitted as: research article | 07 Apr 2020

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This preprint is currently under review for the journal ACP.

Monitoring CO emissions of the metropolis Mexico City using TROPOMI CO observations

Tobias Borsdorff1, Agustín García Reynoso2, Gilberto Maldonado2, Bertha Mar-Morales2, Wolfgang Stremme2, Michel Grutter2, and Jochen Landgraf1 Tobias Borsdorff et al.
  • 1Netherlands Institute for Space Research, SRON, Utrecht, the Netherlands
  • 2Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, México City, Mexíco

Abstract. The Tropospheric Monitoring Instrument (TROPOMI) on ESA Copernicus Sentinel-5 satellite (S5-P) measures the carbon monoxide (CO) total column concentration as one of its primary targets. In this study, we analyse 551 TROPOMI overpasses over Mexico City (more than 2 years of measurements) using collocated CO simulations of the regional Weather Research and Forecasting (WRF) model to conclude on the emissions from different urban districts in the region. The WRF simulation distinguishes the CO emissions from Tula, Pachuca, Tulancingo, Toluca, Cuernavaca, Cuautla, Tlaxcala, Puebla, the metropolian area of Mexico City (CDMX), and the adjoint urban area (ACDMX, CDMX surrounding municipalities from estate of Mexico) by 10 separate tracers. Using a regularised source inversion approach, the TROPOMI observations yields 0.10 Tg/yr and 0.08 Tg/yr CO emissions from the Tula and Pachuca urban areas in the North of Mexico city. This exceeds significantly the Inventario Nacional de Emisiones de Contaminantes Criterio (INEM) inventory that was adapted to the period 2017–2019 and results in an emissions < 0.008 Tg/yr for both areas. For CDMX, TROPOMI estimates emissions of 0.14 Tg/yr CO, which is about half of the INEM emissions of 0.25 Tg/yr. ACDMX area, however, has a higher emissions with 0.29 Tg/yr according to TROPOMI observations versus 0.14 Tg/yr as stated by the INEM inventory. The total emission of both districts is similar (0.43 Tg/yr TROPOMI versus 0.39 Tg/yr adapted INEM emissions). Moreover, we found that the TROPOMI emission estimates for CDMX and ACDMX follow a clear weakly cycle with a minimum during the weekend. This agrees well with ground-based in situ measurements from the Secretaria del Medio Ambiente (SEDEMA) and Fourier Transform Spectrometer column measurements in Mexico City that is operated by the Network for the detection of Atmospheric Composition Change Infrared Working Group (NDACC-IRWG). The study shows an approach to use the large amount of TROPOMI CO data to conclude on urban emissions on sub-city scales for metropolises like Mexico City but also indicates the clear need for further improvements of regional models like WRF, in particular with respect to the prediction of the local wind fields.

Tobias Borsdorff et al.

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Tobias Borsdorff et al.

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