Multiwavelength Raman lidar observations of particle growth during long-range transport of forest-fire smoke in the free troposphere

Details Multiwavelength Raman lidar observations of particle growth during long-range transport of forest-fire smoke in the free troposphere Multiwavelength Raman lidar observations of particle growth during long-range transport of forest-fire smoke in the free troposphere

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3405803m&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 5, CiteID L05803

Physics

9

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Troposphere: Constituent Transport And Chemistry, Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Global Change: Remote Sensing (1855)

Scientific paper

We present particle effective radii and Ångström exponents of aged free-tropospheric forest-fire smoke. The particle plumes were observed with different multiwavelength Raman lidars downwind of the fires that burned in boreal areas of the northern hemisphere. We find an increase of particle size, respectively decrease of the Ångström exponent with transport time which was more than two weeks in some of the investigated cases. Mean effective radii were as large as 0.4 μm. Mean Ångström exponents were as low as 0.04 for the wavelength pair at 355/532 nm. A fit curve that describes particle growth with time is derived. Particle growth levels off after approximately ten days of transport time.

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