Preprints
https://doi.org/10.5194/acp-2021-268
https://doi.org/10.5194/acp-2021-268

  25 May 2021

25 May 2021

Review status: this preprint is currently under review for the journal ACP.

A Satellite Data-Driven Framework to Rapidly Quantify Air Basin-Scale NOx Emission and Its Application to the Po Valley during the COVID-19 Pandemic

Kang Sun1,2, Lingbo Li1, Shruti Jagini1, and Dan Li3 Kang Sun et al.
  • 1Department of Civil, Structural and Environmental Engineering, University at Buffalo, Buffalo, NY, USA
  • 2Research and Education in Energy, Environment and Water Institute, University at Buffalo, Buffalo, NY, USA
  • 3Department of Earth and Environment, Boston University, Boston, MA, USA

Abstract. The evolving nature of the COVID-19 pandemic necessitates timely estimates of the resultant perturbations to anthropogenic emissions. Here we present a novel framework based on the relationships between observed column abundance and wind speed to rapidly estimate air basin-scale NOx emission rate and apply it at the Po Valley in Italy using OMI and TROPOMI NO2 tropospheric column observations. The NOx chemical lifetime is retrieved together with the emission rate and found to be 15–20 h in winter and 5–6 h in summer. A statistical model is trained using the estimated emission rates before the pandemic to predict the trajectory without COVID-19. Compared with this business-as-usual trajectory, the real 2020 emission rates show two distinctive drops in March (−41 %) and November (−35 %) that correspond to tightened COVID-19 control measures. The temporal variation of pandemic-induced NOx emission changes qualitatively agree with Google and Apple mobility indicators. The overall net NOx emission reduction in 2020 due to the COVID-19 pandemic is estimated to be 21 %.

Kang Sun et al.

Status: open (until 20 Jul 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-268', Anonymous Referee #2, 19 Jun 2021 reply
  • RC2: 'Comment on acp-2021-268', Anonymous Referee #1, 22 Jun 2021 reply

Kang Sun et al.

Kang Sun et al.

Viewed

Total article views: 211 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
134 72 5 211 1 1
  • HTML: 134
  • PDF: 72
  • XML: 5
  • Total: 211
  • BibTeX: 1
  • EndNote: 1
Views and downloads (calculated since 25 May 2021)
Cumulative views and downloads (calculated since 25 May 2021)

Viewed (geographical distribution)

Total article views: 277 (including HTML, PDF, and XML) Thereof 277 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 22 Jun 2021
Download
Short summary
We bridge the gap between satellite column observations and emissions by accounting for the dynamic lifetime of pollutants due to wind dispersion and the chemical lifetime due to chemical reactions. Applying it to the Po Valley air basin, we derive the monthly emissions of nitrogen oxides using satellite nitrogen dioxide observations. We further quantify the COVID-19-driven decline of emissions and estimate a 20 % decrease of nitrogen oxide emissions due to the pandemic in 2020.
Altmetrics