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| Titel |
Aerosol pollution potential of major population centers |
| VerfasserIn |
Daniel Kunkel, Mark G. Lawrence, Astrid Kerkweg, Holger Tost, Patrick Jöckel, Stephan Borrmann |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250033679
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| Zusammenfassung |
| Emissions from major population centers (MPCs), including megacities, are becoming more
and more important for the global burden of air pollutants. Once emitted to the atmosphere,
aerosols from MPCs are expected to show differences in their transport and deposition,
depending on the aerosol size and the geographical location of the MPC, which will result in
differences in their potential to pollute the surface and the atmosphere locally and at
downwind locations.
Several simulations for passive aerosol tracers, i.e. with no interactions between
individual tracers, are conducted for emissions from 39 selected MPCs. Using the global
chemistry circulation model EMAC (ECHAM5-MESSy-Atmospheric-Chemistry), four
different sizes of aerosol tracers (0.1, 1.0, 2.5, and 10.0 μm) are emitted with the same
constant emission flux for each MPC. The aerosol tracers undergo transport and dry and wet
deposition; sensitivity simulations with different assumptions about the aerosol solubility are
performed.
The analysis focuses on major transport pathways, either to nearby or remote lower
atmospheric levels, or to the upper troposphere, and on the deposition location, strength, and
kind of deposition. Larger particles tend to more effectively result in pollution buildup and to
be deposited in greater amounts near their sources, whereas smaller particles are transported
more to remote locations, at both low and high altitudes. The 0.1 and 1.0 μm radius
aerosols tend to behave similarly to each other, while the 2.5 μm aerosols represent
a transition between these smaller aerosols and the behavior of the 10 μm size
class.
The analysis presented here provides an effective comparison of how individual
megacities pollute themselves and their environment, particularly in light of differences in
regional geographical and meteorological characteristics. |
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