characterization of forest fire smoke event near washington, dc in summer 2013 with multi-wavelength lidar
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2015
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Abstract
The multi-wavelength lidar technique was applied to the study of a smoke
event near Washington, DC on 26–28 August 2013. Satellite observations
combined with transport model predictions imply that the smoke plume
originated mainly from Wyoming/Idaho forest fires and its transportation to
Washington, DC took approximately 5 days. The NASA Goddard Space Flight Center (GSFC) multi-wavelength
Mie–Raman lidar was used to measure the smoke particle intensive parameters
such as extinction and backscatter Ångström exponents together with
lidar ratios at 355 and 532 nm wavelengths. For interpretation of the
observed vertical profiles of the backscatter Ångström exponents
γβ at 355–532 and 532–1064 nm, numerical simulation was
performed. The results indicate that, for fine-mode dominant aerosols, the
Ångström exponents γβ(355–532) and γβ(532–1064) have essentially different dependence on the particle
size and refractive index. Inversion of 3 β + 2 α lidar
observations on 27–28 August provided vertical variation of the particle
volume, effective radius and the real part of the refractive index through
the planetary boundary layer (PBL) and the smoke layer. The particle effective radius decreased with
height from approximately 0.27 μm inside the PBL to 0.15 μm in
the smoke layer, which was situated above the PBL. Simultaneously the real
part of the refractive index in the smoke layer increased to
mR ≈ 1.5. The retrievals demonstrate also that the fine mode is
predominant in the particle size distribution, and that the decrease of the
effective radius with height is due to a shift of the fine mode toward
smaller radii.
| Reference Key |
veselovskii2015atmosphericcharacterization
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|---|---|
| Authors | ;I. Veselovskii;D. N Whiteman;M. Korenskiy;A. Suvorina;A. Kolgotin;A. Lyapustin;Y. Wang;M. Chin;H. Bian;T. L. Kucsera;D. Pérez-Ramírez;B. Holben |
| Journal | Journal of agricultural and food chemistry |
| Year | 2015 |
| DOI |
10.5194/acp-15-1647-2015
|
| URL | |
| Keywords |
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