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Transport of Dust and Anthropogenic Aerosols Across Alexandria, Egypt : Volume 27, Issue 7 (21/07/2009)

By El-askary, H.

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Book Id: WPLBN0003981728
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Transport of Dust and Anthropogenic Aerosols Across Alexandria, Egypt : Volume 27, Issue 7 (21/07/2009)  
Author: El-askary, H.
Volume: Vol. 27, Issue 7
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Kafatos, M., Farouk, R., Ichoku, C., & El-Askary, H. (2009). Transport of Dust and Anthropogenic Aerosols Across Alexandria, Egypt : Volume 27, Issue 7 (21/07/2009). Retrieved from

Description: Department of Physics Computational Science, and Engineering, Schmid College of Science, Chapman University, Orange, CA 92866, USA. The flow of pollutants from Europe and desert dust to Europe from the Sahara desert both affects the air quality of the coastal regions of Egypt. As such, measurements from both ground and satellite observations assume great importance to ascertain the conditions and flow affecting the Nile Delta and the large city of Alexandria. We note that special weather conditions prevailing in the Mediterranean Sea result in a westerly wind flow pattern during spring and from North to South during the summer. Such flow patterns transport dust-loaded and polluted air masses from the Sahara desert and Europe, respectively, through Alexandria, and the Nile Delta in Egypt. We have carried out measurements acquired with a ground- based portable sun photometer (Microtops II) and the satellite-borne TERRA/Moderate Resolution Imaging Spectroradiometer (MODIS) sensor during the periods of October 1999–August 2001 and July 2002–September 2003. These measurements show a seasonal variability in aerosol optical depth (AOD) following these flow patterns. Maximum aerosol loadings accompanied by total precipitable water vapor (W) enhancements are observed during the spring and summer seasons. Pronounced changes have been observed in the Ångström exponent (α) derived from ground-based measurements over Alexandria (31.14° N, 29.59° E) during both dust and pollution periods. We have followed up the observations with a 3-day back-trajectories model to trace the probable sources and pathways of the air masses causing the observed aerosol loadings. We have also used other NASA model outputs to estimate the sea salt, dust, sulfates and black carbon AOD spatial distributions during different seasons. Our results reveal the probable source regions of these aerosol types, showing agreement with the trajectory and Ångström exponent analysis results. It is confirmed that Alexandria is subjected to different atmospheric conditions involving dust, pollution, mixed aerosols and clean sky.

Transport of dust and anthropogenic aerosols across Alexandria, Egypt

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