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Forest Fire Smoke Layers Observed in the Free Troposphere over Portugal with a Multiwavelength Raman Lidar: Optical and Microphysical Properties
Joint Authors
Preißler, Jana
Guerrero-Rascado, Juan Luis
Wagner, Frank
Silva, Ana Maria
Nepomuceno Pereira, Sérgio
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-07-09
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Medicine
Information Technology and Computer Science
Abstract EN
Vertically resolved optical and microphysical properties of biomass burning aerosols, measured in 2011 with a multiwavelength Raman lidar, are presented.
The transportation time, within 1-2 days (or less), pointed towards the presence of relatively fresh smoke particles over the site.
Some strong layers aloft were observed with particle backscatter and extinction coefficients (at 355 nm) greater than 5 Mm−1 sr−1 and close to 300 Mm−1, respectively.
The particle intensive optical properties showed features different from the ones reported for aged smoke, but rather consistent with fresh smoke.
The Ångström exponents were generally high, mainly above 1.4, indicating a dominating accumulation mode.
Weak depolarization values, as shown by the small depolarization ratio of 5% or lower, were measured.
Furthermore, the lidar ratio presented no clear wavelength dependency.
The inversion of the lidar signals provided a set of microphysical properties including particle effective radius below 0.2 μm, which is less than values previously observed for aged smoke particles.
Real and imaginary parts of refractive index of about 1.5-1.6 and 0.02i, respectively, were derived.
The single scattering albedo was in the range between 0.85 and 0.93; these last two quantities indicate the nonnegligible absorbing characteristics of the observed particles.
American Psychological Association (APA)
Nepomuceno Pereira, Sérgio& Preißler, Jana& Guerrero-Rascado, Juan Luis& Silva, Ana Maria& Wagner, Frank. 2014. Forest Fire Smoke Layers Observed in the Free Troposphere over Portugal with a Multiwavelength Raman Lidar: Optical and Microphysical Properties. The Scientific World Journal،Vol. 2014, no. 2014, pp.1-11.
https://search.emarefa.net/detail/BIM-1049577
Modern Language Association (MLA)
Nepomuceno Pereira, Sérgio…[et al.]. Forest Fire Smoke Layers Observed in the Free Troposphere over Portugal with a Multiwavelength Raman Lidar: Optical and Microphysical Properties. The Scientific World Journal No. 2014 (2014), pp.1-11.
https://search.emarefa.net/detail/BIM-1049577
American Medical Association (AMA)
Nepomuceno Pereira, Sérgio& Preißler, Jana& Guerrero-Rascado, Juan Luis& Silva, Ana Maria& Wagner, Frank. Forest Fire Smoke Layers Observed in the Free Troposphere over Portugal with a Multiwavelength Raman Lidar: Optical and Microphysical Properties. The Scientific World Journal. 2014. Vol. 2014, no. 2014, pp.1-11.
https://search.emarefa.net/detail/BIM-1049577
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1049577