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Proceedings Paper

LIDAR detection of forest fire smoke above Sofia
Author(s): Ivan Grigorov; Atanaska Deleva; Dimitar Stoyanov; Nikolay Kolev; Georgi Kolarov
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Paper Abstract

The distribution of aerosol load in the atmosphere due to two forest fires near Sofia (the capital city of Bulgaria) was studied using two aerosol lidars which operated at 510.6 nm and 1064 nm. Experimental data is presented as 2D-heatmaps of the evolution of attenuated backscatter coefficient profiles and mean profile of the aerosol backscatter coefficient, calculated for each lidar observation. Backscatter related Angstrom exponent was used as a criterion in particle size estimation of detected smoke layers. Calculated minimal values at altitudes where the aerosol layer was observed corresponded to predominant fraction of coarse aerosol. Dust-transport forecast maps and calculations of backward trajectories were employed to make conclusions about aerosol’s origin. They confirmed the local transport of smoke aerosol over the city and lidar station. DREAM forecast maps predicted neither cloud cover, nor Saharan load in the air above Sofia on the days of measurements. The results of lidar observations are discussed in conjunction with meteorological situation, aiming to better explain the reason for the observed aerosol stratification. The data of regular radio sounding of the atmosphere showed a characteristic behavior with small differences of the values between the air temperature and dew-point temperature profiles at aerosol smoke layer altitude. So the resulting stratification revealed the existence of atmospheric layers with aerosol trapping properties.

Paper Details

Date Published: 8 January 2015
PDF: 7 pages
Proc. SPIE 9447, 18th International School on Quantum Electronics: Laser Physics and Applications, 94470U (8 January 2015); doi: 10.1117/12.2178791
Show Author Affiliations
Ivan Grigorov, Institute of Electronics (Bulgaria)
Atanaska Deleva, Institute of Electronics (Bulgaria)
Dimitar Stoyanov, Institute of Electronics (Bulgaria)
Nikolay Kolev, Institute of Electronics (Bulgaria)
Georgi Kolarov, Institute of Electronics (Bulgaria)

Published in SPIE Proceedings Vol. 9447:
18th International School on Quantum Electronics: Laser Physics and Applications
Tanja Dreischuh; Sanka Gateva; Alexandros Serafetinides, Editor(s)

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