Horizontal distribution of tropospheric NO2 and aerosols derived by dual-scan multi-wavelength multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements in Uccle, Belgium
-
Published:2022-08-09
Issue:15
Volume:15
Page:4503-4529
-
ISSN:1867-8548
-
Container-title:Atmospheric Measurement Techniques
-
language:en
-
Short-container-title:Atmos. Meas. Tech.
Author:
Dimitropoulou Ermioni, Hendrick François, Friedrich Martina Michaela, Tack Frederik, Pinardi GaiaORCID, Merlaud Alexis, Fayt Caroline, Hermans Christian, Fierens Frans, Van Roozendael Michel
Abstract
Abstract. Dual-scan ground-based multi-axis differential optical absorption
spectroscopy (MAX-DOAS) measurements of tropospheric nitrogen dioxide
(NO2) and aerosols were carried out in Uccle (50.8∘ N, 4.35∘ E; Brussels region, Belgium) for 2 years from March 2018 to February 2020. The MAX-DOAS instrument operated in both UV and visible wavelength ranges in a dual-scan configuration consisting of two submodes: (1) an elevation scan in a fixed viewing azimuthal direction and (2) an azimuthal
scan in a fixed low elevation angle (2∘). By analyzing the O4 and
NO2 differential slant column
density (dSCD) at six different wavelength intervals along every azimuthal
direction and by applying a new optimal-estimation-based inversion approach
(the so-called mapping MAX-DOAS technique), the horizontal distribution of
the NO2 near-surface concentrations and vertical column densities
(VCDs) as well as the aerosol near-surface extinction coefficients are retrieved
along 10 azimuthal directions. The retrieved horizontal NO2
concentration profiles allow the identification of the main NO2
hotspots in the Brussels area. Correlative comparisons of the retrieved
horizontal NO2 distribution were conducted with airborne, mobile,
air quality model, and satellite datasets, and overall good agreement is
found. The comparison with TROPOMI observations from operational and
scientific data products reveals that the characterization of the
horizontal distribution of tropospheric NO2 VCDs by ground-based
measurements and an adequate a priori NO2 profile shape in TROPOMI
retrievals lead to better consistency between satellite and ground-based
datasets.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference56 articles.
1. Aliwell, S. R., Van Roozendael, M., Johnston, P. V., Richter, A., Wagner, T.,
Arlander, D. W., Burrows, J. P., Fish, D. J., Jones, R. L., Tørnkvist, K. K., and Lambert, J. C.: Analysis for BrO in zenith-sky spectra: An
intercomparison exercise for analysis improvement, J. Geophys. Res., 107, ACH 10-1–ACH 10-20, 2002. 2. Barret, B., De Maziere, M., and Demoulin, P.: Retrieval and characterisation of ozone profiles from solar infrared spectra at the Jungfraujoch, J. Geophys. Res., 107, 4788, https://doi.org/10.1029/2001JD001298, 2002. 3. Beirle, S., Platt, U., Wenig, M., and Wagner, T.: Weekly cycle of NO2 by GOME measurements: a signature of anthropogenic sources, Atmos. Chem. Phys., 3, 2225–2232, https://doi.org/10.5194/acp-3-2225-2003, 2003. 4. Bösch, T., Rozanov, V., Richter, A., Peters, E., Rozanov, A., Wittrock, F., Merlaud, A., Lampel, J., Schmitt, S., de Haij, M., Berkhout, S., Henzing, B., Apituley, A., den Hoed, M., Vonk, J., Tiefengraber, M., Müller, M., and Burrows, J. P.: BOREAS – a new MAX-DOAS profile retrieval algorithm for aerosols and trace gases, Atmos. Meas. Tech., 11, 6833–6859, https://doi.org/10.5194/amt-11-6833-2018, 2018. 5. Burrows, J. P., Weber, M., Buchwitz, M., Rosanov, V. V., Ladstatter, A.,
Weissenmayer, A., Richter, A., DeBeek, R., Hoogen, R., Bramstedt, K., and Eichmann, K. U.: The Global Ozone Monitoring Experiment (GOME): Mission concept and first scientific results, J. Atmos. Sci., 56, 151–175, 1999.
|
|