Study of aerosol optical properties in the Middle East during 2013

Document Type : Research Paper

Authors

1 Department of Physics, Faculty of Sciences, University of Zanjan, Zanjan, Iran

2 Department of Physics, University of Peshawar, Peshawar, Pakistan

Abstract

     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.

Keywords


Alam, K., T. Trautmann, T. Blaschke, 2011. Aerosol optical properties and radiative forcing over mega-city Karachi. Atmos. Res. 101; 773–782.
Alam, K., Trautmann, T. and Blaschke, T, 2012. Aerosol optical and radiative properties during summer and winter seasons over Lahore and Karachi. Atmos. Environ. 50; 234–245.
Alam, K., T. Trautmann, T. Blaschke, F. Subhan, 2014. Changes in aerosol optical properties due to dust storms in the Middle East and Southwest Asia. Remote Sensing of Environment, 143; 216–227.
Angstrom, A., 1964. The parameters of atmospheric turbidity. Tellus16, 1; 64–75.
Bangalath, H.K., G. Stenchikov, 2015. Role of dust direct radiative effect on the tropical rain belt over Middle East and North Africa: A high-resolution AGCM study, Journal of Geophysical Research: Atmospheres, 120 (10); 4564-4584.
Bayat, A., H.R. Khalesifard, A. Masoumi, 2013. Retrieval of aerosol single-scattering albedo and polarized phase function from polarized sun-photometer measurements for Zanjan’s atmosphere. Atmos. Meas. Tech. 6; 2659-2669.
Beegum S.N., I. Gherboudj, N. Chaouch, F. Couvidat , L. Menut, H. Ghedira, 2016. Simulating aerosols over Arabian Peninsula with CHIMERE: Sensitivity to soil, surface parameters and anthropogenic emission inventories. Atmospheric Environment . 128; 185–197.
Bhaskar, V.V., P.D. Safai, M.P. Raju, 2015. Long term characterization of aerosol optical properties: Implications for radiative forcing over the desert region of Jodhpur India, Atmos. Environ. 114; 66-74.
Bibi, H., K. Alam, T. Blaschke, S. Bibi, M.J. Igbal, 2016a. Long-term (2007–2013) analysis of aerosol optical properties over four locations in the Indo-Gangetic plains. Applied Optics. 55, 23; 6199-6211.
Bibi, H., K. Alam, S. Bibi, 2016b. In-depth discrimination of aerosol types using multiple clustering techniques over four locations in Indo-Gangetic plains. Atmos. Res. 181; 106–114.
Dubovik, O., A. Smirnov, B.N. Holben, M.D. King, Y. J. Kaufman, T. F. Eck, I. Slutsker, 2000. Accuracy assessments of aerosol optical properties retrieved from AERONET Sun and sky-radiance measurements. J. Geophys. Res. 105; 9791–9806.
Gharibzadeh, M., K. Alam, A.A. Bidokhti, Y. Abedini, A. Masoumi, 2017a. Radiative Effects and Optical Properties of Aerosol during Two Dust Events in 2013 over Zanjan, Iran, Aerosol Air Qual. Res. 17; 888–898.
Gharibzadeh, M., K. Alam, Y. Abedini, A.A. Bidokhti, A. Masoumi, 2017b. Monthly and seasonal variations of aerosol optical properties and direct radiative forcing over Zanjan, Iran, Journal of Atmospheric and Solar-Terrestrial Physics, 164; 268–275.
Gharibzadeh, M., K. Alam, Y. Abedini, A.A. Bidokhti, A. Masoumi, H. Bibi, 2018. Characterization of aerosol optical properties using multiple clustering techniques over Zanjan, Iran, during 2010–2013. Applied Optics. 57, No. 11; 2881-2889.
Hamidi, M., M.R. Kavianpour, Y. Shao, 2013. Synoptic Analysis of Dust Storms in the Middle East. Asia-Pacific Journal of Atmospheric Sciences, 49(3); 279-286.
Hansen, J., M. Sato, R. Ruedy, 1997. Radiative forcing and climate response. J. Geophys. Res. 102; 6831–6864.
Holben, B.N., T. Eck, I. Slutsker, D. Tanre, J. Buis, A. Setzer, E. Vermote, J.A. Reagan, Y. Kaufman, T. Nakajima, 1998. AERONET—A federated instrument network and data archive for aerosol characterization. Remote Sens. Environ. 66; 1-16.
Jacob, D.J., 1999. Introduction to Atmospheric Chemistry. Princeton University Press, Princeton, New Jersey.
Khoshsima, M., Bidokhti, A.A. and Ahmadi-Givi, F, 2014. Variations of aerosol optical depth and Angstrom parameters at a suburban location in Iran during 2009–2010. J. Earth Syst. Sci. 123; 187–199.
Kokhanovsky, A.A., 1997 .Variability of the Phase Function of Atmospheric Aerosols at Large Scattering Angles. Journal of the Atmospheric Sciences. 55; 314-320.
Koren, I., Y.J. Kaufman, L.A. Remer, J.V. Martins, 2004. Measurement of the effect of Amazon smoke on inhibition of cloud formation. Science, 303; 1342–1345.
Liou, K.N., S.CH.Ou, 1989. The role of cloud microphysical processes in climate: An assessment from a one-dimensional perspective. J. Geophys. Res. 94, D6; 8599–8607.
Masoumi, A., H.R. Khalesifard, A. Bayat, R. Moradhaseli, 2013. Retrieval of aerosol optical and physical properties from ground-based measurements for Zanjan, a city in Northwest Iran. Atmos. Res. 120–121; 343–355.
McCormick, R.A., J.H. Ludwig, 1967. Climate modification by atmospheric aerosols. Science 156; 1358–1359.
Mishra, A.K., T. Shibata, 2012. Synergistic analyses of optical and microphysical properties of agricultural crop residue burning aerosols over the Indo-Gangetic Basin (IGB). Atmos. Environ. 57; 205–218.
Sabbah, I., F.M. Hasan, 2008. Remote sensing of aerosols over the Solar Village, Saudi Arabia, Atmospheric Research, 90; 170–179.
Sabetghadam, S., M. Khoshsima, O. Alizadeh-Choobari, 2018. Spatial and temporal variations of satellite-based aerosol optical depth over Iran in Southwest Asia: Identification of a regional aerosol hot spot. Atmospheric Pollution Research. 9(5); 849-856.
Gharibzadeh & Alam / Desert 2 206 4-2 (2019) 197-206
Seinfeld J.H., S.N. Pandis 1998. Atmospheric chemistry and physics. From air pollution to climate change. 4th ed., Wiley, New Jersey.
Singh, S., S. Nath, R. Kohli, R. Singh, 2005. Aerosols over Delhi during pre-monsoon months: characteristics and effects on surface radiation forcing. Geophys. Res. Lett. 32; L13808.
Sportisse, B., 2007. Fundamentals in air pollution, from processes to modeling. Springer, France.
Srivastava, R., S. Ramachandran, T.A. Rajesh, S. Kedia, 2011. Aerosol radiative forcing deduced from observations and models over an urban location and sensitivity to single scattering albedo. Atmospheric Environment, 45; 6163-6171.
Srivastava, A.K., K. Ram, S. Singh, S. Kumar, S. Tiwari, 2015. Aerosol optical properties and radiative effects over Manora Peak in the Himalayan foothills: seasonal variability and role of transported aerosols. Science of the Total Environment, 502; 287–295.
Winker, D.M., W.H. Hunt, M.J. McGill, 2007. Initial performance assessment of CALIOP. Geophysical Research Letters, 34, L19803. 34, L19803, doi: 10.1029/2007GL030135.
Zoljoodi, M., A. Didevarasl, A.R. Saadatabadi, 2013. Dust Events in the Western Parts of Iran and the Relationship with Drought Expansion over the Dust Source Areas in Iraq and Syria. Atmospheric and Climate Sciences, 3; 321-336.