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Radiative Characteristics of Aerosol During Extreme Fire Event over Siberia in Summer 2012Microphysical and optical properties of aerosol were studied during a mega-fire event in summer 2012 over Siberia using ground-based measurements of spectral solarradiation at the AERONET site in Tomsk and satellite observations. The data were analyzed using multi-year (2003-2013) measurements of aerosol characteristics under back-ground conditions and for less intense fires, differing in burning biomass type, stage of fire, remoteness from observation site, etc. (ordinary smoke). In June-August 2012, the average aerosol optical depth (AOD, 500 nm) had been 0.95+/-0.86, about a factor of 6 larger than background values (0.16+/-0.08), and a factor of 2.5 larger than in ordinary smoke. The AOD values were extremely high on 24-28 July and reached 3-5. A comparison with satellite observations showed that ground-based measurements in the region of Tomsk not only reflect the local AOD features, but are also characteristic for the territory of Western Siberia as a whole. Single scattering albedo (SSA, 440 nm) in this period ranged from 0.91 to 0.99 with an average of approx. 0.96 in the entire wavelength range of 440-1020 nm. The increase in absorptance of aerosol particles (SSA(440 nm)=0.92) and decrease in SSA with wavelength observed in ordinary smoke agree with the data from multi-year observations in analogous situations in the boreal zone of USA and Canada. Volume aerosol size distribution in extreme and ordinary smoke had a bimodal character with significant prevalence of fine-mode particles, but in summer 2012 the mean median radius and the width of the fine-mode distribution somewhat increased. In contrast to data from multi-year observations, in summer 2012 an increase in the volume concentration and median radius of the coarse mode was observed with growing AOD.
Document ID
20170005562
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Zhuravleva, Tatiana B.
(Academy of Sciences (Russia) Tomsk, Russian Federation)
Kabanov, Dmitriy M.
(Academy of Sciences (Russia) Tomsk, Russian Federation)
Nasrtdinov, Ilmir M.
(Academy of Sciences (Russia) Tomsk, Russian Federation)
Russkova, Tatiana V.
(Academy of Sciences (Russia) Tomsk, Russian Federation)
Sakerin, Sergey M.
(Academy of Sciences (Russia) Tomsk, Russian Federation)
Smirnov, Alexander
(Science Systems and Applications, Inc. Lanham, MD, United States)
Holben, Brent N.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
June 14, 2017
Publication Date
January 13, 2017
Publication Information
Publication: Atmospheric Measurement Techniques
Publisher: Copernicus
Volume: 10
Issue: 1
e-ISSN: 1867-8548
Subject Category
Environment Pollution
Report/Patent Number
GSFC-E-DAA-TN43456
Funding Number(s)
CONTRACT_GRANT: NNG15HQ01C
Distribution Limits
Public
Copyright
Other

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