Atmos. Chem. Phys. Discuss., 8, 11879-11907, 2008
© Author(s) 2008. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Direct observation of two dimensional trace gas distribution with an airborne Imaging DOAS instrument
K.-P. Heue1, T. Wagner2, S. P. Broccardo3, D. Walter1, S. J. Piketh3, K. E. Ross4, S. Beirle2, and U. Platt1
1Institut für Umweltphysik (IUP), Universität Heidelberg, Heidelberg, Germany
2Max Planck Institut für Chemie, Mainz, Germany
3Climatology Research Group, University of the Witwatersrand, Johannesburg, South Africa
4Research and Innovation Department, Eskom, South Africa

Abstract. In many investigations of tropospheric chemistry information about the two dimensional distribution of trace gases on a small scale (e.g. tens to hundreds of meters) is highly desirable. An airborne instrument based on imaging Differential Optical Absorption Spectroscopy has been built to map the 2-D distribution of a series of relevant trace gases including NO2, HCHO, C2H2O2, H2O, O4, SO2, and BrO on a scale of 100 m.

Here we report on the first tests of the novel aircraft instrument over the industrialised South African Highveld, where large variations in NO2 column densities in the immediate vicinity of several sources e.g. power plants or steel works, were measured. The observed patterns in the trace gas distribution are interpreted with respect to flux estimates, and it is seen that the fine resolution of the measurements allows separate sources in close proximity to one another to be distinguished.

Citation: Heue, K.-P., Wagner, T., Broccardo, S. P., Walter, D., Piketh, S. J., Ross, K. E., Beirle, S., and Platt, U.: Direct observation of two dimensional trace gas distribution with an airborne Imaging DOAS instrument, Atmos. Chem. Phys. Discuss., 8, 11879-11907, doi:10.5194/acpd-8-11879-2008, 2008.
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