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Exploiting satellite measurements to explore uncertainties in UK bottom-up NOx emission estimates

Pope, Richard J; Kelly, Rebecca; Marais, Eloise A; Graham, Ailish M; Wilson, Chris; Harrison, Jeremy J; Moniz, Savio JA; ... Chipperfield, Martyn P; + view all (2022) Exploiting satellite measurements to explore uncertainties in UK bottom-up NOx emission estimates. Atmospheric Chemistry and Physics , 22 (7) pp. 4323-4338. 10.5194/acp-22-4323-2022. Green open access

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Abstract

Nitrogen oxides (NOx, NO + NO2) are potent air pollutants which directly impact on human health and which aid the formation of other hazardous pollutants such as ozone (O3) and particulate matter. In this study, we use satellite tropospheric column nitrogen dioxide (TCNO2) data to evaluate the spatiotemporal variability and magnitude of the United Kingdom (UK) bottom-up National Atmospheric Emissions Inventory (NAEI) NOx emissions. Although emissions and TCNO2 represent different quantities, for UK city sources we find a spatial correlation of ∼0.5 between the NAEI NOx emissions and TCNO2 from the high-spatial-resolution TROPOspheric Monitoring Instrument (TROPOMI), suggesting a good spatial distribution of emission sources in the inventory. Between 2005 and 2015, the NAEI total UK NOx emissions and long-term TCNO2 record from the Ozone Monitoring Instrument (OMI), averaged over England, show annually decreasing trends of 4.4 % and 2.2 %, respectively. Top-down NOx emissions were derived in this study by applying a simple mass balance approach to TROPOMI-observed downwind NO2 plumes from city sources. Overall, these top-down estimates were consistent with the NAEI, but for larger cities such as London and Birmingham the inventory is significantly (>25 %) less than the top-down emissions.

Type: Article
Title: Exploiting satellite measurements to explore uncertainties in UK bottom-up NOx emission estimates
Open access status: An open access version is available from UCL Discovery
DOI: 10.5194/acp-22-4323-2022
Publisher version: https://doi.org/10.5194/acp-22-4323-2022
Language: English
Additional information: © Author(s) 2022. This work is distributed under the Creative Commons Attribution 4.0 License.
UCL classification: UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10147451
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