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Vienna horizontal and vertical distribution observations of nitrogen dioxide and aerosols

Project Leader
Schreier Stefan, Project Leader
Type of Research
Basic Research
Project partners
Universität Bremen, Institut für Umweltphysik (IUP) , Germany.
Function of the Project Partner: Partner
University of Veterinary Medicine, Vienna, 1210 Wien, Austria.
Contact person: Dr. Alois Schmalwieser;
Function of the Project Partner: Partner
Weihs Philipp, Sub Projectleader
Kubu Gerhard, Project Staff
Revesz Michael, Project Staff
BOKU Research Units
Institute of Meteorology and Climatology
Funded by
Fonds zur Förderung der wissenschaftlichen Forschung (FWF) , Sensengasse 1, 1090 Wien, Austria
The overall goal of the proposed project is to improve our current knowledge of air pollution in large agglomerations caused by mankind. The investigation of nitrogen dioxide (NO2) and aerosol amounts will be based on spectral measurements from two Multi AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) instruments located at two different sites with ideal measurement conditions in Vienna, Austria. The MAX-DOAS instrument is an advancement of the zenith scattered light DOAS and Off-Axis DOAS that allows for measurements at different viewing directions and thus, obtaining information about the horizontal and vertical variations of trace gases and aerosols in the troposphere.
The geometrical approximation and an optimal estimation method implemented in the Bremian advanced MAX-DOAS Retrieval Algorithm (BREAM) will be used to retrieve tropospheric columns and vertical profiles of NO2 and aerosols. The vertical profiles provide additional information for the comparison with in-situ measurements in Vienna.
The altitude-averaged tropospheric vertical trace gas columns retrieved from MAX-DOAS together with meteorological measurements (e.g. wind speed, wind direction) allow the monitoring of air pollutants (NO2 and aerosols) for urban background, high-traffic roads, and industrial point sources on the horizontal level.
The proposed long-term measurements (more than two years) will provide a valuable data set for analyzing the temporal variability of air pollutants over Vienna. Moreover, these data will be used for the comparison with MAX-DOAS observations in Athens, Greece, and Bremen, Germany to investigate similarities and differences between polluted sites at different latitudes and meteorological and photochemical regimes. Tropospheric vertical columns of NO2 will also allow the validation of satellite measurements from the OMI, GOME-2, and TROPOMI instruments as well as comparison with model simulations, for example from the COPERNICUS atmospheric monitoring service.
As the measurements from the two instruments covering several azimuthal directions with partially overlapping fields of view together with in-situ measurements provide a multitude of information on the spatial NO2 distribution, an attempt will be made to develop a spatially resolved image of air pollution for Vienna using a tomographic imaging approach.
The results of the project will provide information about the horizontal and vertical distributions of NO2 and aerosols over an urban environment. In addition to improvements in the trace gas retrieval, the results will also provide important information for the model community, as the vertical profiles of NO2 are a useful supplement to the point measurements of in-situ instruments.

Optics; Environmental physics; Meteorology; Remote sensing;
Aerosols; Max DOAS; Nitrogen dioxide; 3-D profile of pollutants;

Revesz, M., Schreier, S. F., Weihs, P., Bösch, T., Lange, K., Richter, A., Vrekoussis, M., and Schmalwieser, A. W. (2020): A method for retrieving the spatial distribution of trace gases using measurements of three ground-based MAX-DOAS instruments. [Poster]
[European Geosciences Union EGU General Assembly 2020, Vienna, Austria, 04.05.2020 - 08.05.2020]

In: EGU , EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-8792 FullText

Schreier, S., Richter, A., Bösch, T., Lange, K., Revesz, M., Hilboll, A., Peters, E., Vrekoussis, M., Weihs, P., Schmalwieser, A., and Burrows, J (2020): Spatial and temporal distributions of NO2 and aerosols over the urban environment of Vienna during the VINDOBONA project (2017-2019). [Poster]
[European Geosciences Union EGU General Assembly 2020, Vienna, Austria, 04.05.2020 - 08.05.2020]

In: EGU2020-14832,, EGU General Assembly 2020, Online FullText

Stefan Schreier, Philipp Weihs, Andreas Richter, Tim Bösch, Kezia Lange, Andreas Hilboll, Mihalis Vrekoussis, John Burrows, Enno Peters and Alois Schmalwieser (2019): Retrieval of tropospheric NO2vertical column densities from multipleground-based MAX-DOAS measurements in Vienna and comparison withsatellite data. [Poster]
[European Geoscience Union EGU General Assembly 2019, Vienna, Austria, 07.04.2019 - 12.04.2019]

, Geophysical Research Abstracts, 21, 14195-14195

Philipp Weihs, Selina Köstenberger, Marc Olefs, Marcus Rennhofer, Martin Hallwachs, Stefan Schreier, Sandro Oswald, Christian Guetzer, Heidelinde Trimmel, Alois Schmalwieser, and Andreas Richter (2018): nvestigation of aerosol and water vapor effects on shortwave and longwave downward irradiance using different ground-based measurements during clear sky conditions. [Poster]
[European Geosciences Union EGU General Assembly 2018, Vienna, Austria, 08.04.2018 - 13.04.2018]

, Geophysical Research Abstracts, 20, 9479-9479

Stefan Schreier, Philipp Weihs, Enno Peters, Andreas Richter, Mareike Ostendorf, Anja Schönhardt, John P. Burrows, and Alois Schmalwieser (2017): MAX-DOAS measurements of NO2 column densities in Vienna. [Poster]
[European Geosciences Union EGU General Assembly 2017, Vienna, Austria, 23.04.2017 - 28.04.2017]

, Geophysical Research Abstracts, 19, 8340-8340 FullText

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