 |
| Titel |
Strong spatial variability of NO2 over polluted areas and within emission plumes observed by aircraft imaging DOAS |
| VerfasserIn |
Anja Schoenhardt, Andreas C. Meier, Andreas Richter, Thomas Ruhtz, Carsten Lindemann, John P. Burrows |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250093969
|
| Publikation (Nr.) |
 EGU/EGU2014-9212.pdf |
|
|
|
|
|
| Zusammenfassung |
| In the troposphere, nitrogen dioxide, NO2, is mainly produced from nitric oxide, NO, emitted
by combustion processes. Enhanced NO2 amounts are an indicator of air pollution and may
lead to boundary layer ozone production as well as acidification and eutrophication of
ecosystems.
The IUP Bremen AirMAP (Airborne imaging DOAS instrument for Measurements of
Atmospheric Pollution) has been used for NO2 observations over point sources and polluted
areas during aircraft campaigns in 2011 and 2013. The instrument yields NO2 column
densities at fine horizontal resolution, down to 30m ground pixel side length, and at good
spatial coverage. Areas of several km2 are covered with NO2 measurements within a few
minutes.
Aircraft observations of spatial NO2 distributions are presented for different locations in
Europe and different source regions, such as power plants, cities and motorways. The
obtained NO2 maps reveal large spatial variability. For example, large gradients in the
transition between rural and urban areas, spatial variability over cities and extended areas
and, in particular, remarkably strong non-uniform distributions within individual emission
plumes downwind of point sources are observed. The observations have implications for
experimental emission estimates, the deduced relevance of emission sources and downwind
chemistry, as well as the interpretation of satellite- and ground-based remote sensing
measurements. The focus of this study is the analysis of the amounts and detailed spatial
signatures in the NO2 maps, which is made possible by the favourable AirMAP imaging
capabilities. |
|
|
|
|
|
|