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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/amt-2020-33
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-33
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  20 Mar 2020

20 Mar 2020

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A revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Validation of TROPOMI tropospheric NO2 columns using dual-scan MAX-DOAS measurements in Uccle, Brussels

Ermioni Dimitropoulou1, François Hendrick1, Gaia Pinardi1, Martina M. Friedrich1, Alexis Merlaud1, Frederik Tack1, Helene De Longueville2, Caroline Fayt1, Christian Hermans1, Quentin Laffineur3, Frans Fierens4, and Michel Van Roozendael1 Ermioni Dimitropoulou et al.
  • 1Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, 1180, Belgium
  • 2Université Libre de Bruxelles (ULB), Brussels, Belgium
  • 3Royal Meteorological Institute of Belgium, Uccle, 1180, Belgium
  • 4IRCEL-CELINE, Brussels, Belgium

Abstract. Ground-based Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements of aerosols and tropospheric nitrogen dioxide (NO2) were carried out in Uccle (50.8° N, 4.35° E) Brussels, during one year from March 2018 until March 2019. The instrument was operated in both UV and visible (Vis) wavelength ranges in a dual-scan configuration consisting of two sub-modes: (1) an elevation scan in a fixed viewing azimuthal direction (the so-called main azimuthal direction) pointing to the Northeast and (2) an azimuthal scan in a fixed low elevation angle (2°). By applying a vertical profile inversion algorithm in the main azimuthal direction and a parameterization technique in the other azimuthal directions, near-surface NO2 concentrations (VMRs) and vertical column densities (VCDs) were retrieved in ten different azimuthal directions. The dual-scan MAX-DOAS dataset allows partly resolving the horizontal distribution of NO2 around the measurement site and studying its seasonal variations. Furthermore, we show that measuring the tropospheric NO2 VCDs in different azimuthal directions improves the spatial colocation with measurements from the Sentinel-5 Precursor (S5P), leading to a reduction of the spread in validation results. By using NO2 vertical profile information derived from the MAX-DOAS measurements, we also resolve a systematic underestimation in S5P NO2 data due to the use of inadequate a-priori NO2 profile shape data in the satellite retrieval.

Ermioni Dimitropoulou et al.

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Ermioni Dimitropoulou et al.

Ermioni Dimitropoulou et al.

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Short summary
We present one year of dual-scan ground-based Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements of aerosols and tropospheric nitrogen dioxide (NO2) in Uccle (Belgium). Measuring the tropospheric NO2 VCDs in different azimuthal directions has a positive result on the comparison with measurements from TROPOMI. We prove that the use of inadequate a-priori NO2 profile shape data in the TROPOMI retrieval is responsible for the systematic underestimation in S5P NO2 data.
We present one year of dual-scan ground-based Multi-AXis Differential Optical Absorption...
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