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| Titel |
Urban emission hot-spots as sources for remote aerosol deposition |
| VerfasserIn |
D. Kunkel, M. G. Lawrence, H. Tost, A. Kerkweg, P. Jöckel, S. Borrmann |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064864
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| Zusammenfassung |
| Large point sources such as major population centers (MPCs) emit pollutants which can be
deposited nearby or transported over long distances before deposition. We have used tracer
simulations of aerosols emitted from MPCs worldwide to assess the fractions which are
deposited at various distances away from their source location. Considering only source
location, prevailing meteorology, and the aerosol size and solubility, we show that fine
aerosol particles have a high potential to pollute remote regions. About half of the emitted
mass of aerosol tracers with an ambient diameter -¤ 1.0μm is typically deposited in regions
more than 1000 km away from the source. Furthermore, using the Köppen-Geiger climate
classification to categorize the sources into various climate classes we find substantial
differences in the deposition potential between these classes. Tracers originating
in arid regions show the largest remote deposition potentials, with values more
than doubled compared to the smallest potentials from tracers in tropical regions.
Seasonal changes in atmospheric conditions lead to variations in the remote deposition
potentials. On average the remote deposition potentials in summer correspond to about
70 - 80% of the values in winter, with a large spread among the climate classes. For
tracers from tropical regions the summer remote deposition values are only about
31% of the winter values, while they are about 95% for tracers from arid regions. |
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