چکیده:
Aerosols affect the earth's atmospheric radiative fluxes via direct, semi-direct, and indirect mechanisms. Aerosols also are one of the main sources of uncertainty in climate models. In the Middle East, in addition to climate effects, various problems such as reduced visibility, human health hazards, and air pollution are caused by aerosols. Studying the optical and physical properties of aerosols on local and global scales helps reduce the uncertainties in climate forcing. In this study, aerosol optical properties, including Aerosol Optical Depth (AOD) , Angstrom Exponent (AE) , ASYmmetry parameter (ASY) , Single Scattering Albedo (SSA) , and phase function were analyzed. These properties were investigated over five sites in the Middle East during 2013 using the Aerosol Robotic NETwork (AERONET) data. The results revealed an inverse relationship between AOD and AE in all sites. A high AOD value and a low AE value were detected in spring and summer in all studied sites, suggestive of coarse mode dust particles. ASY initially decreased due to the dominance of absorbing type aerosols in the visible spectrum with the increase in wavelength. Afterwards, ASY increased with the increase in wavelength in the infrared region due to the dominance of the coarse mode particles. In most sites, SSA increased, particularly in spring and summer, with the increase in the wavelength because of the dominance of desert dust. In spring and summer, the phase function was high over all sites. High phase functions associated with small scattering angles were caused by the coarse mode particles.
خلاصه ماشینی:
In this study, aerosol optical properties, including Aerosol Optical Depth (AOD), Angstrom Exponent (AE), ASYmmetry parameter (ASY), Single Scattering Albedo (SSA), and phase function were analyzed.
Aerosols also influence radiative processes and climate: directly by backscattering and absorbing solar radiation (McCormick and Ludwig, 1967), semi- directly via changes in atmospheric temperature structure and evaporation rate of cloud droplets Corresponding author.
The present study of aerosol optical characteristics such as Aerosol Optical Depth (AOD), Angstrom Exponent (AE), ASYmmetry parameter (ASY), Single Scattering Albedo (SSA), and Phase function, provides important information over five locations in the Middle East using the AErosol RObotic NETwork (AERONET) data sets.
Monthly- averaged variation of AOD at 500 nm, and AE at 440–870 nm, over five locations in the Middle East (IASBS, KAUST Campus, Masdar Institute, Mezaira and Solar Village) in 2013 3.
Spectral variation of monthly-averaged SSA over five locations (IASBS, KAUST Campus, Masdar Institute, Mezaira and Solar Village) in the Middle East in 2013 In several sites (IASABS, KAUST Campus, and Masdar Institute), maximum AOD values were detected in summer while in others (Mezaira and Solar Village), they occurred in spring.
Variation of monthly average of phase function over five locations (IASBS, KAUST Campus, Masdar Institute, Mezaira and Solar Village) in the Middle East in 2013 (View the image of this page) Continued Fig. 5.
Variation of monthly average of phase function over five locations (IASBS, KAUST Campus, Masdar Institute, Mezaira and Solar Village) in the Middle East in 2013 3.