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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-2017-326
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
24 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
Investigation of NO2 vertical distribution using two DOAS retrievals for GOME-2A measurements in the UV and vis spectral range
Lisa K. Behrens1, Andreas Hilboll1,2, Andreas Richter1, Enno Peters1, Henk Eskes3, and John P. Burrows1 1Institute of Environmental Physics (IUP-UB), University of Bremen, Bremen, Germany
2MARUM – Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
3Royal Netherlands Meteorological Institute (KNMI), De Bilt, the Netherlands
Abstract. In this study, we present a novel NO2 DOAS retrieval in the ultraviolet (UV) spectral range for satellite observations from the Global Ozone Monitoring Instrument 2 on board EUMETSAT’s MetOp-A (GOME-2A) satellite. We compare the results to those from an established NO2 retrieval in the visible (vis) spectral range from the same instrument and infer information about the NO2 vertical profile shape in the troposphere.

As expected, radiative transfer calculations for satellite geometries show that the sensitivity close to the ground is higher in the vis than in the UV spectral range. Consequently, NO2 slant column densities (SCDs) in the vis are usually higher than in the UV, if the NO2 is close to the surface. Therefore, these differences in NO2 SCDs between the two spectral ranges contain information on the vertical distribution of NO2 in the troposphere. We combine these results with radiative transfer calculations and simulated NO2 fields from the TM5 chemistry transport model to evaluate the simulated NO2 vertical distribution.

We investigate regions representative for both anthropogenic and biomass burning NO2 pollution. Anthropogenic air pollution is mostly located in the boundary layer close to the surface, which is reflected by the large differences between UV and vis SCDs of ~ 60 %. Biomass burning NO2 in contrast is often uplifted into elevated layers above the boundary layer. This is best seen in tropical Africa south of the equator, where the biomass burning NO2 is well observed in the UV, and the difference between the two spectral ranges is only ~ 36 %. In tropical Africa north of the equator, however, the biomass burning NO2 is located closer to the ground, reducing its visibility.

While not enabling a full retrieval of the vertical NO2 profile shape in the troposphere, our results can help to constrain the vertical profile of NO2 in the lower troposphere and, when analyzed together with simulated NO2 fields, can help interpret the model output.


Citation: Behrens, L. K., Hilboll, A., Richter, A., Peters, E., Eskes, H., and Burrows, J. P.: Investigation of NO2 vertical distribution using two DOAS retrievals for GOME-2A measurements in the UV and vis spectral range, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-326, in review, 2017.
Lisa K. Behrens et al.
Lisa K. Behrens et al.
Lisa K. Behrens et al.

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Short summary
We developed a novel NO2 DOAS retrieval for the GOME-2A instrument in the UV spectral range, which is compared with a NO2 retrieval in the visible and model values. Regions representative for both anthropogenic and biomass burning NO2 pollution are investigated. Anthropogenic air pollution is mostly located in the boundary layer close to the surface. In contrast, biomass burning NO2 is often uplifted into elevated layers.
We developed a novel NO2 DOAS retrieval for the GOME-2A instrument in the UV spectral range,...
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