Articles | Volume 22, issue 14
https://doi.org/10.5194/acp-22-9413-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-22-9413-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
21 Jul 2022
Research article |
| 21 Jul 2022
| 21 Jul 2022
Eddy covariance measurements highlight sources of nitrogen oxide emissions missing from inventories for central London
Will S. Drysdale
CORRESPONDING AUTHOR
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
Adam R. Vaughan
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
Freya A. Squires
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
now at: British Antarctic Survey, Natural Environment Research Council, Cambridge, CB3 0ET, UK
Sam J. Cliff
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
Stefan Metzger
Battelle, National Ecological Observatory Network, 1685 38th Street, Boulder, CO 80301, USA
Dept of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, 1225 W Dayton St, Madison, WI 53711, USA
David Durden
Battelle, National Ecological Observatory Network, 1685 38th Street, Boulder, CO 80301, USA
Natchaya Pingintha-Durden
Battelle, National Ecological Observatory Network, 1685 38th Street, Boulder, CO 80301, USA
Carole Helfter
UK Centre for Ecology and Hydrology, Bush Estate, Penicuik, EH26 0QB, UK
Eiko Nemitz
UK Centre for Ecology and Hydrology, Bush Estate, Penicuik, EH26 0QB, UK
C. Sue B. Grimmond
Department of Meteorology, University of Reading, Reading, RG6 6BB, UK
Janet Barlow
Department of Meteorology, University of Reading, Reading, RG6 6BB, UK
Sean Beevers
MRC Centre for Environment and Health, Imperial College London, London, UK
Gregor Stewart
MRC Centre for Environment and Health, Imperial College London, London, UK
David Dajnak
MRC Centre for Environment and Health, Imperial College London, London, UK
Ruth M. Purvis
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
National Centre for Atmospheric Science, University of York, York, UK
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
National Centre for Atmospheric Science, University of York, York, UK
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Cited
11 citations as recorded by crossref.
- Flux measurements of NOx, O3 and Ox: Emission characteristics, inventory validation and titration effects X. Zhang et al. 10.1016/j.envpol.2025.127213
- Direct observations of NOx emissions over the San Joaquin Valley using airborne flux measurements during RECAP-CA 2021 field campaign Q. Zhu et al. 10.5194/acp-23-9669-2023
- Natural Gas Leakage Ratio Determined from Flux Measurements of Methane in Urban Beijing Y. Huangfu et al. 10.1021/acs.estlett.4c00573
- Intercomparison of eddy-covariance software for urban tall-tower sites C. Lan et al. 10.5194/amt-17-2649-2024
- Temporal and spatial variations in NO2 fluxes by tall tower eddy covariance measurements over a dense urban center in Sakai, Japan S. Okamura et al. 10.1016/j.atmosenv.2024.120870
- Identifying missing sources and reducing NOx emissions uncertainty over China using daily satellite data and a mass-conserving method L. Lu et al. 10.5194/acp-25-2291-2025
- Pandemic restrictions in 2020 highlight the significance of non-road NOx sources in central London S. Cliff et al. 10.5194/acp-23-2315-2023
- A managed boreal forest landscape in northern Sweden is a persistent net carbon sink despite large inter-annual weather anomalies J. Chi et al. 10.1016/j.agrformet.2025.110758
- Quantifying black carbon emissions from traffic and construction in central London using eddy covariance Z. Cheng et al. 10.1039/D5EA00039D
- Development and application of an eddy covariance system based on amplitude-modulated cavity-enhanced absorption spectroscopy for NO2 flux measurement in a wheat field Q. Du et al. 10.1016/j.agrformet.2025.110826
- Evidence of Heating-Dominated Urban NOx Emissions S. Cliff et al. 10.1021/acs.est.4c13276
11 citations as recorded by crossref.
- Flux measurements of NOx, O3 and Ox: Emission characteristics, inventory validation and titration effects X. Zhang et al. 10.1016/j.envpol.2025.127213
- Direct observations of NOx emissions over the San Joaquin Valley using airborne flux measurements during RECAP-CA 2021 field campaign Q. Zhu et al. 10.5194/acp-23-9669-2023
- Natural Gas Leakage Ratio Determined from Flux Measurements of Methane in Urban Beijing Y. Huangfu et al. 10.1021/acs.estlett.4c00573
- Intercomparison of eddy-covariance software for urban tall-tower sites C. Lan et al. 10.5194/amt-17-2649-2024
- Temporal and spatial variations in NO2 fluxes by tall tower eddy covariance measurements over a dense urban center in Sakai, Japan S. Okamura et al. 10.1016/j.atmosenv.2024.120870
- Identifying missing sources and reducing NOx emissions uncertainty over China using daily satellite data and a mass-conserving method L. Lu et al. 10.5194/acp-25-2291-2025
- Pandemic restrictions in 2020 highlight the significance of non-road NOx sources in central London S. Cliff et al. 10.5194/acp-23-2315-2023
- A managed boreal forest landscape in northern Sweden is a persistent net carbon sink despite large inter-annual weather anomalies J. Chi et al. 10.1016/j.agrformet.2025.110758
- Quantifying black carbon emissions from traffic and construction in central London using eddy covariance Z. Cheng et al. 10.1039/D5EA00039D
- Development and application of an eddy covariance system based on amplitude-modulated cavity-enhanced absorption spectroscopy for NO2 flux measurement in a wheat field Q. Du et al. 10.1016/j.agrformet.2025.110826
- Evidence of Heating-Dominated Urban NOx Emissions S. Cliff et al. 10.1021/acs.est.4c13276
Latest update: 03 Nov 2025
Short summary
Measurements of NOx emissions are important for a good understanding of air quality. While there are many direct measurements of NOx concentration, there are very few measurements of its emission. Measurements of emissions provide constraints on emissions inventories and air quality models. This article presents measurements of NOx emission from the BT Tower in central London in 2017 and compares them with inventories, finding that they underestimate by a factor of ∼1.48.
Measurements of NOx emissions are important for a good understanding of air quality. While there...
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