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| Titel |
Aerosol climatology over Nile Delta based on MODIS, MISR and OMI satellite data |
| VerfasserIn |
H. S. Marey, J. C. Gille, H. M. El-Askary, E. A. Shalaby, M. E. El-Raey |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 20 ; Nr. 11, no. 20 (2011-10-27), S.10637-10648 |
| Datensatznummer |
250010148
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| Publikation (Nr.) |
 copernicus.org/acp-11-10637-2011.pdf |
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| Zusammenfassung |
| Since 1999 Cairo and the Nile delta region have suffered from air pollution
episodes called the "black cloud" during the fall season. These have been
attributed to either burning of agriculture waste or long-range transport of
desert dust. Here we present a detailed analysis of the optical and
microphysical aerosol properties, based on satellite data. Monthly mean
values of Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol optical
depth (AOD) at 550 nm were examined for the 10 yr period
from 2000–2009. Significant monthly variability is observed in the AOD with
maxima in April or May (~0.5) and October (~0.45), and a
minimum in December and January (~0.2). Monthly mean values
of UV Aerosol Index (UVAI) retrieved by the Ozone Monitoring Instrument
(OMI) for 4 yr (2005–2008) exhibit the same AOD pattern. The carbonaceous
aerosols during the black cloud periods are confined to the planetary
boundary layer (PBL), while dust aerosols exist over a wider range of
altitudes, as shown by Cloud-Aerosol Lidar and Infrared Pathfinder Satellite
Observation (CALIPSO) aerosol profiles. The monthly climatology of
Multi-angle Imaging SpectroRadiometer (MISR) data show that the aerosols
during the black cloud periods are spherical with a higher percentage of
small and medium size particles, whereas the spring aerosols are mostly
large non-spherical particles. All of the results show that the air quality
in Cairo and the Nile delta region is subject to a complex mixture of air
pollution types, especially in the fall season, when biomass burning
contributes to a background of urban pollution and desert dust. |
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