Optical and microphysical properties of the columnar Aerosol burden over the Eastern Mediterranean: Discrimination of Aerosol types

Tutsak, Ersin
Koçak, Mustafa
Optical and microphysical properties, for example, refractive index, single scattering albedo (SSA) and asymmetry factor were attained from AERONET ground based sun sky radiometer situated at rural coastal Erdemli in the Eastern Mediterranean between 2000 and 2014. On average, imaginary part of the refractive index (REFI similar to 0.007) and SSA (similar to 0.93) denoted that the aerosol composition was similar to that of Industrial/Urban aerosol type. However, the daily variation in optical and microphysical properties was greatly influenced by diverse aerosol types. REFI for relatively clean dust events decreased from similar to 0.010 at 440 nm to 0.002 at 1020 nm whereas corresponding SSA increased from similar to 0.80 at 440 nm to similar to 0.96 at 1020 nm. Comparatively, lower REFI and higher SSA values were observed when the dust particles mixed with secondary aerosols might be due to shielding of iron oxides by sulfate and nitrate particles. On the contrary, larger REFI (up to 0.044 at 440 nm) and lower SSA (down to 0.72 at 440 nm) values were found for dust mixed with smoke particles likely because of lensing effect. REFI for spring reduced from 0.065 at 440 nm to 0.038 at 1020 nm with SSA rising from 0.92 to 0.95 owing to frequent dust episodes take place in this period. Although, summer and fall exhibited similar wavelength dependence of REFI and SSA, the former denoted more absorbing character compared to the latter. This difference might be ascribed to anthropogenic aerosol composition, such as black carbon and secondary aerosol, with diverging contributions. Hierarchical cluster analyses revealed six classes namely, dust, dust mixed with smoke particles, smoke, smoke with secondary, secondary with smoke and secondary aerosol type. Relative contributions from hierarchical cluster analyses and angstrom exponent classification yielded coherent results, dust and anthropic being around 20% and 80%, respectively. Whereas, k-means exhibited overestimation and underestimation for dust (35%) and anthropogenic (65%) aerosol type, respectively. The hierarchical cluster analysis was more powerful tool to classify aerosol type than k-means, thus the application of the k-means should be performed with an utmost care.


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Tutsak, Ersin; Koçak, Mustafa (2019-06-15)
Long-term aerosol optical and physical properties such as aerosol optical thickness and angstrom exponent were obtained from AERONET ground based sun sky radiometer located at the rural coastal Erdemli (36.6 degrees N, 34.3 degrees E) site in the Eastern Mediterranean from January 2000 to December 2014. Aerosol Optical Thickness (AOT) and Angstrom Exponent (alpha) exhibited a great short-term variability, varying up to couple of fold from day to day. The lowest AOT values was found in winter due to the remo...
Tutsak, Ersin; Koçak , Mustafa; Department of Oceanography (2018-7-26)
Long-term aerosol optical and micro physical properties obtained from AERONET sun/sky radiometer situated at the rural coastal site of Eastern Mediterranean between January 2000 and December 2014 were analyzed. Moreover, concentrations of SO42-, NH4+, NO3- (in PM2.5) and their precursor gases (SO2, NH3 and HNO3) were measured with a near real-time Ambient Ion Monitor-Ion Chromatography instrument in winter and summer of 2015. Air flow arriving at 1 km and 4 from Eastern Europe and Western Europe showed a ne...
Temporal variations and sources of Eastern Mediterranean aerosols based on a 9-year observation
ÖZTÜRK, FATMA; zararsız, Abdullah; Dutkiewicz, V. A.; Husain, L.; Hopke, P. K.; Tuncel, Süleyman Gürdal (2012-12-01)
Concentrations of 48 elements, NO3-, SO42-, CI-, NH4+ and black carbon (BC) were determined in PM10 aerosols collected daily at a rural Eastern Mediterranean (EM) site (Antalya, 30.34 degrees E, 36.47 degrees N) from 1993 to 2001. Temporal variations (daily, seasonal and long term), sources and source regions of EM aerosols were delineated. Concentrations of elements with marine and crustal origin were more episodic as compared to anthropogenic ones. Most of the variables showed well defined seasonal cycles...
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Optical and photoelectrical properties of TlInSSe layered single crystals
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Optical and electrical properties of TlInSSe layered single crystals have been studied by means of transmission, reflection and photoconductivity measurements. Transmission and reflection experiments have been carried out from 540 to 1000 nm at room temperature. Derivative analysis was applied to both transmission and reflection spectra and indirect band gap energy was found as 2.06 eV. Photoconductivity measurements have been performed in the temperature range from 245 to 300 K and in the voltage range fro...
Citation Formats
E. Tutsak and M. Koçak, “Optical and microphysical properties of the columnar Aerosol burden over the Eastern Mediterranean: Discrimination of Aerosol types,” ATMOSPHERIC ENVIRONMENT, pp. 0–0, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32341.