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

Meier, A. C., Schönhardt, A., Bösch, T., Richter, A., Seyler, A., Ruhtz, T., et al. (2016). High-resolution airborne imaging DOAS-measurements of NO2 above Bucharest during AROMAT. Atmospheric Measurement Techniques Discussions, 9.

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 Creators:
Meier, A. C., Author
Schönhardt, A., Author
Bösch, T., Author
Richter, A., Author
Seyler, A., Author
Ruhtz, T., Author
Constantin, D.-E., Author
Shaiganfar, R.1, Author           
Wagner, T.1, Author           
Merlaud, A., Author
Van Roozendael, M., Author
Belegante, L., Author
Nicolae, D., Author
Georgescu, L., Author
Burrows, J. P., Author
Affiliations:
1Satellite 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 Meeasurements of Aerosols an 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 airmass 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 measured intensities at the aircraft. 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 seen 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 cofficients 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 mol s−1 and 13.6 ± 8.4 mol s−1, respectively.

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 Dates: 2016
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.5194/amt-2016-329
 Degree: -

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Title: Atmospheric Measurement Techniques Discussions
  Other : Atmos. Meas. Tech. Discuss.
  Abbreviation : AMTD
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau : Copernicus
Pages: 42 Volume / Issue: 9 Sequence Number: - Start / End Page: - Identifier: Other: 1867-8610
CoNE: https://pure.mpg.de/cone/journals/resource/1867-8610