Quantification of NOx point sources from TROPOMI

Abstract:
We detect and quantify NOx point sources from the divergence of the horizontal NOx flux based on the continuity equation. The analysis steps are: - The NOx flux is determined for each TROPOMI (TROPOspheric Monitoring Instrument) orbit by upscaling the TROPOMI tropospheric NO2 column to NOx and multiplying it with horizontal wind fields from ECMWF (300m above ground). - The NOx fluxes are averaged for 2018-2019. - The divergence, i.e. spatial derivative, of the mean NOx flux is calculated, which is particularly sensitive for point sources. - NOx point sources are detected in the divergence map by an automated search algorithm for local maxima, and quantified by fitting a Gaussian function to these maxima. Ambiguous cases are skipped. TROPOMI is the satellite instrument on board of the Copernicus Sentinel-5 Precursor satellite. The approach of deriving emission information from the divergence of the NOx flux is described in Beirle et al., 2019: Beirle, S., Borger, C., Dörner, S., Li, A., Hu, Z., Liu, F., Wang, Y. and Wagner, T.: Pinpointing nitrogen oxide emissions from space, Science Advances, 5(11), eaax9800, doi:10.1126/sciadv.aax9800, 2019. The details and modifications made for the automated detection of NOx point sources on global scale are provided in Beirle et al., 2020: Beirle, S., Borger, C., Dörner, S., Eskes, H., Kumar, V., de Laat, A., and Wagner, T.: Catalog of NOx emissions from point sources as derived from the divergence of the NO2 flux for TROPOMI, to be submitted to Earth System Science Data, 2020.

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Metadata Information

General

General information section
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  • Quant_NOx_TROPOMI
contactsee section contact (role: pointOfContact)
dateStamp 2020-10-22T10:39:46
metadataStandardNameISO 19115
metadataStandardVersionISO 19139 / DKRZ ISO Simple Profile V1.0
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identificationInfo

Identification information section
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citation
  • title:
    • Quantification of NOx point sources from TROPOMI
  • dates:
    • creation: 2020-08-14
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    • see section contact (role: distributor)
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    • doi:10.26050/WDCC/Quant_NOx_TROPOMI
abstract see above
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graphicOverview
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descriptiveKeywords:
  • theme:
    • TROPOMI
  • theme:
    • NOx emissions from power plants
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Contact

Role: pointOfContact

Contact information section
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individualNameSteffen Beirle
organisationNameMax-Planck-Institute for Chemistry
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    organisationNameMax-Planck-Institute for Chemistry
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    contentInfo

    Content information section
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      • mass_flux_of_nitrogen_oxides_due_to_emission
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      • modelResult

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