S5P TROPOMI NO<sub>2</sub> slant column retrieval: method, stability, uncertainties and comparisons with OMI. van Geffen, J., Boersma, K. F., Eskes, H., Sneep, M., ter Linden, M., Zara, M., & Veefkind, J. P. Atmospheric Measurement Techniques, 13(3):1315–1335, March, 2020.
S5P TROPOMI NO<sub>2</sub> slant column retrieval: method, stability, uncertainties and comparisons with OMI [link]Paper  doi  abstract   bibtex   
Abstract. The Tropospheric Monitoring Instrument (TROPOMI), aboard the Sentinel-5 Precursor (S5P) satellite, launched on 13 October 2017, provides measurements of atmospheric trace gases and of cloud and aerosol properties at an unprecedented spatial resolution of approximately 7×3.5 km2 (approx. 5.5×3.5 km2 as of 6 August 2019), achieving near-global coverage in 1 d. The retrieval of nitrogen dioxide (NO2) concentrations is a three-step procedure: slant column density (SCD) retrieval, separation of the SCD in its stratospheric and tropospheric components, and conversion of these into vertical column densities. This study focusses on the TROPOMI NO2 SCD retrieval: the retrieval method used, the stability of the SCDs and the SCD uncertainties, and a comparison with the Ozone Monitoring Instrument (OMI) NO2 SCDs. The statistical uncertainty, based on the spatial variability of the SCDs over a remote Pacific Ocean sector, is 8.63 µmol m−2 for all pixels (9.45 µmol m−2 for clear-sky pixels), which is very stable over time and some 30 % less than the long-term average over OMI–QA4ECV data (since the pixel size reduction TROPOMI uncertainties are ∼8 % larger). The SCD uncertainty reported by the differential optical absorption spectroscopy (DOAS) fit is about 10 % larger than the statistical uncertainty, while for OMI–QA4ECV the DOAS uncertainty is some 20 % larger than its statistical uncertainty. Comparison of the SCDs themselves over the Pacific Ocean, averaged over 1 month, shows that TROPOMI is about 5 % higher than OMI–QA4ECV, which seems to be due mainly to the use of the so-called intensity offset correction in OMI–QA4ECV but not in TROPOMI: turning that correction off means about 5 % higher SCDs. The row-to-row variation in the SCDs of TROPOMI, the “stripe amplitude”, is 2.15 µmol m−2, while for OMI–QA4ECV it is a factor of ∼2 (∼5) larger in 2005 (2018); still, a so-called stripe correction of this non-physical across-track variation is useful for TROPOMI data. In short, TROPOMI shows a superior performance compared with OMI–QA4ECV and operates as anticipated from instrument specifications. The TROPOMI data used in this study cover 30 April 2018 up to 31 January 2020.
@article{van_geffen_s5p_2020,
	title = {{S5P} {TROPOMI} {NO}\<sub\>2\</sub\> slant column retrieval: method, stability, uncertainties and comparisons with {OMI}},
	volume = {13},
	issn = {1867-8548},
	shorttitle = {{S5P} {TROPOMI} {NO}\<sub\>2\</sub\> slant column retrieval},
	url = {https://amt.copernicus.org/articles/13/1315/2020/},
	doi = {10.5194/amt-13-1315-2020},
	abstract = {Abstract. The Tropospheric Monitoring Instrument (TROPOMI), aboard the Sentinel-5
Precursor (S5P) satellite, launched on 13 October 2017, provides
measurements of atmospheric trace gases and of cloud and aerosol properties
at an unprecedented spatial resolution of
approximately 7×3.5 km2 (approx. 5.5×3.5 km2
as of 6 August 2019), achieving near-global coverage in 1 d. The retrieval of nitrogen dioxide (NO2) concentrations is a
three-step procedure: slant column density (SCD) retrieval, separation of the
SCD in its stratospheric and tropospheric components, and conversion of
these into vertical column densities. This study focusses on the TROPOMI NO2 SCD retrieval:
the retrieval method used, the stability of the SCDs and the SCD
uncertainties, and a comparison with the Ozone Monitoring Instrument (OMI) NO2 SCDs. The statistical uncertainty, based on the spatial variability of the SCDs
over a remote Pacific Ocean sector, is 8.63 µmol m−2 for all
pixels (9.45 µmol m−2 for clear-sky pixels), which is very
stable over time and some 30 \% less than the long-term average over
OMI–QA4ECV data (since the pixel size reduction TROPOMI uncertainties are
∼8 \% larger). The SCD uncertainty reported by the differential optical absorption spectroscopy (DOAS) fit is about 10 \% larger
than the statistical uncertainty, while for OMI–QA4ECV the DOAS uncertainty
is some 20 \% larger than its statistical uncertainty. Comparison of the SCDs themselves over the Pacific Ocean, averaged over 1 month, shows that TROPOMI is about 5 \% higher than OMI–QA4ECV, which seems
to be due mainly to the use of the so-called intensity offset correction in
OMI–QA4ECV but not in TROPOMI: turning that correction off means about 5 \%
higher SCDs. The row-to-row variation in the SCDs of TROPOMI, the “stripe amplitude”, is
2.15 µmol m−2, while for OMI–QA4ECV it is a factor of
∼2 (∼5) larger in 2005 (2018); still, a so-called stripe
correction of this non-physical across-track variation is useful for TROPOMI
data. In short, TROPOMI shows a superior performance compared with OMI–QA4ECV
and operates as anticipated from instrument specifications. The TROPOMI data used in this study cover 30 April 2018 up to
31 January 2020.},
	language = {en},
	number = {3},
	urldate = {2020-09-24},
	journal = {Atmospheric Measurement Techniques},
	author = {van Geffen, Jos and Boersma, K. Folkert and Eskes, Henk and Sneep, Maarten and ter Linden, Mark and Zara, Marina and Veefkind, J. Pepijn},
	month = mar,
	year = {2020},
	pages = {1315--1335},
}
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