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  Quantifying urban, industrial, and background changes in NO2 during the COVID-19 lockdown period based on satellite observations

Fioletov, V., McLinden, C. A., Griffin, D., Krotkov, N., Liu, F., Eskes, H. (2023): Quantifying urban, industrial, and background changes in NO2 during the COVID-19 lockdown period based on satellite observations, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0994

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016460 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016460_1
Genre: Conference Paper

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 Creators:
Fioletov, Vitali1, Author
McLinden, Chris A.1, Author
Griffin, Debora1, Author
Krotkov, Nickolay1, Author
Liu, Fei1, Author
Eskes, Henk1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The tropospheric NO2 vertical column density (VCD) values measured by the Tropospheric Monitoring Instrument (TROPOMI) were used to study the tropospheric NO2 variability and COVID-19 impacts for the 3° by 4° areas around 261 major cities worldwide. A new method of isolation of three components: background NO2, NO2 from urban sources, and from industrial point sources is applied to estimate the impact of the COVID-19 lockdown on each of them. The method is based on fitting satellite data by a statistical model with empirical plume dispersion functions driven by a meteorological reanalysis. Population density and surface elevation data as well as coordinates of industrial sources were used in the analysis. Unlike other similar studies that studied plumes from emission sources, this study included the background component as a function of the elevation in the analysis. Abrupt changes in urban and industrial emissions due to COVID-19 lockdown did not immediately result in a similar decline in the background component. Different changes in background and urban components in TROPOMI NO2 could explain the inconsistency between the surface and satellite VCD-based results: surface concentrations demonstrated a larger decline than tropospheric NO2. While background NO2 component remained almost unchanged during the lockdown period, the urban NO2 component declined by -18% to -28% over most regions. India, South America, and a part of Europe (particularly, Italy, France, and Spain) demonstrated a -40% to -50% urban emissions decline.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-0994
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -