A study of aerosol particle sizes in the atmosphere of Athens,Greece, retrieved from solar spectral measurements |
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| Affiliation: | 1. Directorate of Air and Noise Pollution Control, Ministry for the Environment Physical Planning and Public Works, Patission 147, 11251 Athens, Greece;2. Atmospheric Research Team, Institute of Environmental Research and Sustainable Development, National Observatory of Athens, P.O. Box 20048, 11810 Athens, Greece;1. Optospintronics Department, National Institute of Research and Development for Optoelectronics, 77125 Magurele, Romania;2. Magnetism and Superconductivity Department, National Institute of Materials Physics, 105bis Atomistilor, 77125 Magurele, Romania;3. Faculty of Power Engineering, University Politehnica of Bucharest, 060032 Bucharest, Romania;1. Department of Physics, Fatih University, Buyukcekmece, 34500 Istanbul, Turkey;2. Faculty of Engineering and Natural Sciences, Suleyman Demirel University, 040900 Almaty, Kazakhstan;3. TUBITAK-BILGEM, Information Technologies Institute, 41470 Gebze-Kocaeli, Turkey;1. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;2. Key Lab of Coherent Light, Atomic and Molecular Spectroscopy, Ministry of Education, Changchun 130012, China;1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, PO Box 353, Beijing 100190, China;2. University of Chinese Academy of Sciences, No. 19(A) Yuquan Road, Beijing 100049, China;3. Shougang Research Institute of Technology, Beijing 100043, China |
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| Abstract: | This work aims at determining the aerosol particle radii in the atmosphere of Athens. Such a work is carried out in Athens for the first time. For this purpose, solar spectral direct-beam irradiance measurements were used in the spectral range 310–575 nm. To estimate the particle radius from aerosol optical depth retrieval, a minimization technique was employed based on the golden-section search of the difference between experimental and theoretical values of the aerosol optical depth. The necessary Mie computations were performed based on the algorithm LVEC.In this study, the mean particle radius of a given distribution was calculated every 30 min during cloudless days in the period November 1996 to September 1997. The largest particles were observed in the summer and the smallest during winter. The result was verified by the increased values of the aerosol optical depth and the turbidity factors calculated in the summer. The differences in the diurnal variation from season to season are attributed to the prevailing wind regime, pollutant emission and sink rates in the atmosphere of Athens. |
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