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Quantification of NOx point sources from TROPOMI
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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Citation proposal
Steffen Beirle (Max-Planck-Institute for Chemistry) - Christian Borger (Max-Planck-Institute for Chemistry) - Steffen Dörner (Max-Planck-Institute for Chemistry) - Henk Eskes (Koninklijk Nederlands Meteorologisch Instituut) - Vinod Kumar (Max-Planck-Institute for Chemistry) - Adrianus de Laat (Koninklijk Nederlands Meteorologisch Instituut) - Thomas Wagner (Max-Planck-Institute for Chemistry). Quantification of NOx point sources from TROPOMI. https://gdk.gdi-de.org/geonetwork/srv/api/records/de.dkrz.wdcc.iso3880364 |
Simple
- Alternate title
- Quantification of NOx point sources from TROPOMI
- Date ( Creation )
- 2020-08-14
- Identifier
- None
- Identifier
- doi:10.26050/WDCC/Quant_NOx_TROPOMI / Quantification of NOx point sources from the TROPOspheric Monitoring Instrument (TROPOMI)
Originator
- Other citation details
- doi:10.26050/WDCC/Quant_NOx_TROPOMI
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- Keywords ( Theme )
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- TROPOMI
- Keywords ( Theme )
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- NOx emissions from power plants
- Metadata language
- eng English
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- Begin date
- 2018-01-01
- End date
- 2019-12-31
- Distribution format
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- CSV (Comma Separated Values )
Distributor
- Units of distribution
- Mb
- Transfer size
- 0
- OnLine resource
- http://doi.org/doi:10.26050/WDCC/Quant_NOx_TROPOMI
- Hierarchy level
- series Series
gmd:MD_Metadata
- File identifier
- de.dkrz.wdcc.iso3880364 XML
- Hierarchy level
- series Series
- Hierarchy level name
- Quant_NOx_TROPOMI
- Date stamp
- 2021-10-23T04:40:27
- Metadata standard name
- ISO 19115
- Metadata standard version
- ISO 19139 / DKRZ ISO Simple Profile V1.0
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