Daily and monthly averaged aerosol optical properties and diurnal variability deduced from AERONET sun-photometric measurements at Thala site (Tunisia) |
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| Authors: | M Chaâbane M Masmoudi K Medhioub F Elleuch |
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| Institution: | (1) Département de Physique, Faculté des Sciences de Sfax, Tunisia;(2) Institut Préparatoire aux Etudes d’Ingénieurs de Sfax, (IPEIS) Sfax, Tunisia;(3) Institut National de la Météorologie, Subdivision de Sfax, Tunisia |
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| Abstract: | Summary Spectral aerosol optical thickness have been measured at Thala site (central West of Tunisia) from March to October 2001.
The measurement site is located in a continental and non industrialized region, approximately 150 km from the North coast
of the Mediterranean Sea and nearby the Algerian border. Thala site could be then influenced by the dust content of the continental
air masses carried by western and southern winds. A second pollution source is constituted by industrial and/or maritime particles
carried by northern and eastern winds. AOT measurements acquired through the ground-based AERONET are analyzed. The diurnal
cycle over Thala and two other areas within the network showed various trends and a prevailing pattern of the optical thickness
increase by 10–40% during the day. Daily AOT and monthly averaged aerosol optical thickness, ?ngstr?m coefficient and precipitable
water vapor are computed and compared with those of other sites. Measured meteorological parameters represent a valuable supplement
to the data sets with the sunphotometer measurements. The analysis of the results shows that there is a high correlation between
aerosol optical properties (AOT and ?ngstr?m coefficient) and the local weather conditions, essentially wind speed and direction
and air specific humidity. |
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