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  High-resolution airborne imaging DOAS measurements of NO2 above Bucharest during AROMAT

Meier, A. C., Schonhardt, A., Bosch, T., Richter, A., Seyler, A., Ruhtz, T., et al. (2017). High-resolution airborne imaging DOAS measurements of NO2 above Bucharest during AROMAT. Atmospheric Measurement Techniques, 10(5), 1831-1857. doi:10.5194/amt-10-1831-2017.

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Meier, Andreas Carlos1, Author
Schonhardt, Anja1, Author
Bosch, Tim1, Author
Richter, Andreas1, Author
Seyler, Andre1, Author
Ruhtz, Thomas1, Author
Constantin, Daniel-Eduard1, Author
Shaiganfar, R.2, Author           
Wagner, T.2, Author           
Merlaud, Alexis1, Author
Van Roozendael, Michel1, Author
Belegante, Livio1, Author
Nicolae, Doina1, Author
Georgescu, Lucian1, Author
Burrows, John Philip1, Author
Affiliations:
1external, ou_persistent22              
2Satellite Remote Sensing, Max Planck Institute for Chemistry, Max Planck Society, ou_1826293              

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 Abstract: In this study we report on airborne imaging DOAS measurements of NO2 from two flights performed in Bucharest during the AROMAT campaign (Airborne ROmanian Measurements of Aerosols and Trace gases) in September 2014. These measurements were performed with the Airborne imaging Differential Optical Absorption Spectroscopy (DOAS) instrument for Measurements of Atmospheric Pollution (AirMAP) and provide nearly gapless maps of column densities of NO2 below the aircraft with a high spatial resolution of better than 100 m. The air mass factors, which are needed to convert the measured differential slant column densities (dSCDs) to vertical column densities (VCDs), have a strong dependence on the surface reflectance, which has to be accounted for in the retrieval. This is especially important for measurements above urban areas, where the surface properties vary strongly. As the instrument is not radiometrically calibrated, we have developed a method to derive the surface reflectance from intensities measured by AirMAP. This method is based on radiative transfer calculation with SCIATRAN and a reference area for which the surface reflectance is known. While surface properties are clearly apparent in the NO2 dSCD results, this effect is successfully corrected for in the VCD results. Furthermore, we investigate the influence of aerosols on the retrieval for a variety of aerosol profiles that were measured in the context of the AROMAT campaigns. The results of two research flights are presented, which reveal distinct horizontal distribution patterns and strong spatial gradients of NO2 across the city. Pollution levels range from background values in the outskirts located upwind of the city to about 4  ×  1016 molec cm−2 in the polluted city center. Validation against two co-located mobile car-DOAS measurements yields good agreement between the datasets, with correlation coefficients of R =  0.94 and R =  0.85, respectively. Estimations on the NOx emission rate of Bucharest for the two flights yield emission rates of 15.1 ± 9.4 and 13.6 ± 8.4 mol s−1, respectively.

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 Dates: 2017
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000401803100001
DOI: 10.5194/amt-10-1831-2017
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Title: Atmospheric Measurement Techniques
  Abbreviation : AMT
Source Genre: Journal
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Publ. Info: Göttingen : European Geosciences Union, Copernicus
Pages: - Volume / Issue: 10 (5) Sequence Number: - Start / End Page: 1831 - 1857 Identifier: Other: 1867-1381
CoNE: https://pure.mpg.de/cone/journals/resource/1867-1381