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| Titel |
Ozone pollution over the Arabian Gulf - impact of meteorological condition |
| VerfasserIn |
L. Smoydzin, J. Lelieveld  |
| 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 |
250069037
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| Zusammenfassung |
| The Middle East and particularly the Arabian Gulf region are characterised by highly
favourable conditions for O3 formation in summer. We investigated the impact of
meteorological conditions on O3 formation using the WRF-chem model. The dispersion of
air pollutants strongly depends, on local wind patterns, in particular the persistent low-level
north-westerly flow known as the summer Shamal, and the land-sea breeze circulation
system.
A general finding from our simulations is that extreme pollution events with O3 mixing ratios
exceeding 150 nmol/mol can occur regularly over the Arabian Gulf, however, their location
and magnitude can vary widely. O3 mixing ratios are highest when the outflow
of the regions with major anthropogenic emissions along the coastline is further
advected over the Gulf where pollution plumes are captured in the shallow and stable
marine boundary layer allowing little ventilation. The sea-breeze circulation often
causes onshore advection of the pollution in the afternoon, affecting the densely
populated coastal regions along the western shoreline of the Gulf. When the pollution is
transported deeper over land, O3 mixing ratios are generally lower due to rapid
dilution of precursor gases in the very deep convective boundary layer over the desert. |
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