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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:27 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Characteristics of a major saharan dust event during may 2013 at Magurele, Romania.
Authors:
L. LABZOVSKII (1,2), Flori TOANCA (1,2), Anca NEMUC(2)
Affiliation:
(1) University of Bucharest, Faculty of Physics, P.O.BOX MG-11, Magurele - Bucharest, 077125, Romania
(2) - National Institute of Research and Development for Optoelectronics, 409 Atomistilor Street, Magurele, Romania
E-mail
labzowsky@gmail.com
Keywords:
lidar remote sensing, aerosols, dust pollution
Abstract:
This paper is devoted to a special case study of dust intrusion on May 20, 2013 at Magurele measurement site (44.35 N, 26.03 E). The main aim was to characterize microphysical properties of the aerosols over Magurele when dust transport was detected. HYSPLIT (HYbrid Single-Particle Lagrangian Integrated Trajectory) simulation showed the presence of the Saharan dust lofted in Northern Africa on May 18 of 2013, these dust particles were transported towards South-Eastern Europe and reached Magurele on the morning of May 20 of 2013. The optical parameters of the dust over Magurele were calculated based on Multiwavelength Lidar and Sun Photometer measurements. By analyzing optical parameters of dust from 20 of May we detected the presence of high-depolarizing particles in the layer between 2.5 and 4.5 kilometers. Angstrom exponent drastically decreased from 19 to 20 of May indicating the presence of coarse particles in the atmosphere. Measured volume depolarization ratio for mixed dust over Bucharest usually doesn’t exceed 0.20 while in our study case we measured volume depolarization ratio up to 0.28-0.30, hence pure dust particles with Saharan origin were detected (according to HYSPLIT backtrajectory simulation). Microphysical parameters of dust aerosols were retrieved using Lidar-Photometer inversion codes: LIRIC (Lidar-Radiometer inversion code) and POLIPHON (Polarization Lidar-Photometer Method). Using these codes mass concentration of aerosols was derived and we were able to separate particles on spherical/non-spherical using POLIPHON and on fine spherical/coarse spherical/coarse spheroids using LIRIC respectively.
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