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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Short summary
Trace gases play a key role in the chemistry of urban atmospheres. Therefore, knowledge about their spatial distribution is needed to fully characterize the air quality in urban areas. Using a new Multi-AXis Differential Optical Absorption Spectroscopy (MAXDOAS)-2D instrument, along with inversion algorithms, we report for the first time two-dimensional maps of NO2 concentrations in the city of Madrid, Spain.
Preprints
https://doi.org/10.5194/amt-2020-239
https://doi.org/10.5194/amt-2020-239

  15 Jul 2020

15 Jul 2020

Review status: this preprint is currently under review for the journal AMT.

Two-dimensional monitoring of air pollution in Madrid using a MAXDOAS-2D instrument

David Garcia-Nieto1,2, Nuria Benavent1,2, Rafael Borge2, and Alfonso Saiz-Lopez1 David Garcia-Nieto et al.
  • 1Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid 28006, Spain
  • 2Universidad Politécnica de Madrid, UPM, 28006 Madrid, Spain

Abstract. Trace gases play a key role in the chemistry of urban atmospheres. Therefore, knowledge about their spatial distribution is needed to fully characterize the air quality in urban areas. Using a new Multi-AXis Differential Optical Absorption Spectroscopy (MAXDOAS)-2D instrument, along with inversion algorithms, we report for the first time two-dimensional maps of NO2 concentrations in the city of Madrid, Spain. We found good agreement between the MAXDOAS-2D mesoscale observations and the in-situ measurements provided by Madrid´s air quality monitoring stations. In addition to vertical profiles, we studied the horizontal gradients of NO2 in the surface layer by applying the different horizontal light path lengths in the two spectral regions included in the NO2 spectral analysis: ultraviolet (UV, at 360 nm) and visible (VIS, 477 nm). Finally, we also investigate the sensitivity of the instrument to infer vertically-distributed information on aerosol extinction coefficients and discuss possible future ways to improve the retrievals.

David Garcia-Nieto et al.

 
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

David Garcia-Nieto et al.

David Garcia-Nieto et al.

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Short summary
Trace gases play a key role in the chemistry of urban atmospheres. Therefore, knowledge about their spatial distribution is needed to fully characterize the air quality in urban areas. Using a new Multi-AXis Differential Optical Absorption Spectroscopy (MAXDOAS)-2D instrument, along with inversion algorithms, we report for the first time two-dimensional maps of NO2 concentrations in the city of Madrid, Spain.
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