Remote Sensing Applications and Decision Support

Lidar observations of long-range transported Saharan dust over Sofia, Bulgaria: a case study of dust mixed with local aerosols

[+] Author Affiliations
Zahary Y. Peshev, Tanja N. Dreischuh, Tsvetina T. Evgenieva, Atanaska D. Deleva, Dimitar V. Stoyanov

Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee Boulevard, 1784 Sofia, Bulgaria

Dimitar Tonev

Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee Boulevard, 1784 Sofia, Bulgaria

J. Appl. Remote Sens. 10(3), 036009 (Jul 28, 2016). doi:10.1117/1.JRS.10.036009
History: Received March 25, 2016; Accepted July 1, 2016
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Abstract.  Two-wavelength (1064/532  nm) lidar observations of long-range transported Saharan dust present in the atmosphere over Sofia, Bulgaria, during a 4-day dust intrusion event in winter 2010, are reported. Aged desert aerosols are detected at altitudes up to 4 km above the sea level, within and above the boundary layer as mixed with other aerosols—representing the particular case under consideration. Optical, microphysical, and dynamical properties of dust aerosols are obtained and analyzed. Special attention is paid to retrieving and vertical profiling of dust backscatter-related Ångström exponents (BAEs), as well as to determining their frequency-count distributions. Obtained BAE values in the range 0.3 to 0.6 (±0.2) indicate domination of coarse particles in the near overmicron size range. Reasonability of coarse-mode-dominated dust size composition is substantiated, based on measurement and transportation-history analysis. The performed frequency-count statistics reveals dust BAE distributions asymmetrically extended to multimode distribution shapes, resulting from dust mixing with finer local aerosol fractions. Peculiarities and patterns of the aerosol dynamics at different stages of dust-loading event are revealed and discussed.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Topics

Aerosols ; LIDAR ; Particles

Citation

Zahary Y. Peshev ; Tanja N. Dreischuh ; Tsvetina T. Evgenieva ; Atanaska D. Deleva ; Dimitar Tonev, et al.
"Lidar observations of long-range transported Saharan dust over Sofia, Bulgaria: a case study of dust mixed with local aerosols", J. Appl. Remote Sens. 10(3), 036009 (Jul 28, 2016). ; http://dx.doi.org/10.1117/1.JRS.10.036009


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