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| Titel |
The Beijing Olympics as a Field Experiment - The Aerosol Footprint of a Megacity |
| VerfasserIn |
J. Čermák, R. Knutti |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027151
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| Zusammenfassung |
| During the 2008 Olympic Summer Games, emission reductions were enforced in and around
Beijing to improve the notoriously poor air quality in the city. In this presentation we explore
the effect of these measures on the regional aerosol load. To this end, we compare
satellite-retrieved aerosol optical thickness of that period with previous years. In
addition to absolute changes we explore the 2008 situation in its meteorological
context. Using a neural network approach we predict summer 2008 aerosol based on
meteorological conditions. Predicted values are contrasted with observations. A statistically
significant reduction of aerosol load is found in Beijing that decreases in magnitude and
significance with increasing region size. Locally, the aerosol load (log(AOT)) was about
10–15% below the levels expected for the prevailing meteorological situation. The
small size of this effect highlights the importance of regional aerosol transport. |
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