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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 12 — Apr. 20, 2000
  • pp: 1879–1892

Microphysical particle parameters from extinction and backscatter lidar data by inversion with regularization: experiment

Detlef Müller, Frank Wagner, Ulla Wandinger, Albert Ansmann, Manfred Wendisch, Dietrich Althausen, and Wolfgang von Hoyningen-Huene  »View Author Affiliations


Applied Optics, Vol. 39, Issue 12, pp. 1879-1892 (2000)
http://dx.doi.org/10.1364/AO.39.001879


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Abstract

We present effective radius, volume, surface-area, and number concentrations as well as mean complex refractive index of tropospheric particle size distributions based on lidar measurements at six wavelengths. The parameters are derived by means of an inversion algorithm that has been specifically designed for the inversion of available optical data sets. The data were taken on 20 June and on 20 July 1997 during the Aerosol Characterization Experiment ACE 2 (North Atlantic/Portugal) and on 9 August 1998 during the Lindenberg Aerosol Characterization Experiment LACE 98 (Lindenberg/Germany). Measurements on 20 June 1997 were taken in a clean-marine boundary layer, and a large value of 0.64 µm for the effective radius, a low value of 1.45 for the real part, and a negligible imaginary part of the complex refractive index were found. The single-scatter albedo was 0.98 at 532 nm. It was derived from the particle parameters with Mie-scattering calculations. In contrast, the particles were less than 0.2 µm in effective radius in a continental-polluted aerosol layer on 20 July 1997. The real part of the complex refractive index was ∼1.6; the imaginary part showed values near 0.03i. The single-scatter albedo was 0.84. On 9 August 1998 an elevated particle layer located from 3000 to 6000 m was observed, which had originated from an area of biomass burning in northwestern Canada. Here the effective radius was ∼0.24 µm, the real part of the complex refractive index was above 1.6, the imaginary part was ∼0.04i, and the single-scatter albedo was 0.81. Excellent agreement has been found with results based on sunphotometer and in situ measurements that were performed during the field campaigns.

© 2000 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(100.0100) Image processing : Image processing
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(290.0290) Scattering : Scattering

History
Original Manuscript: July 7, 1999
Revised Manuscript: December 17, 1999
Published: April 20, 2000

Citation
Detlef Müller, Frank Wagner, Ulla Wandinger, Albert Ansmann, Manfred Wendisch, Dietrich Althausen, and Wolfgang von Hoyningen-Huene, "Microphysical particle parameters from extinction and backscatter lidar data by inversion with regularization: experiment," Appl. Opt. 39, 1879-1892 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-12-1879


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