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

D Müller1, F Wagner, U Wandinger

  • 1Institute for Tropospheric Research, Permoserstrasse 15, D-04303 Leipzig, Germany. detlef@tropos.de

Applied Optics
|March 18, 2008
PubMed
Summary
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Lidar measurements reveal distinct tropospheric particle properties. Clean marine air showed large particles, while polluted and biomass burning layers had smaller particles with varying refractive indices and single-scatter albedo.

Area of Science:

  • Atmospheric Science
  • Aerosol Physics
  • Optical Remote Sensing

Background:

  • Tropospheric aerosols significantly influence Earth's climate and air quality.
  • Understanding aerosol particle size distributions and optical properties is crucial for climate modeling.

Purpose of the Study:

  • To derive key parameters of tropospheric particle size distributions using multi-wavelength lidar measurements.
  • To characterize aerosol optical properties in different atmospheric conditions.

Main Methods:

  • Utilized a specialized inversion algorithm to process lidar data at six wavelengths.
  • Applied Mie-scattering calculations to determine single-scatter albedo from particle parameters.
  • Conducted measurements during the Aerosol Characterization Experiment (ACE 2) and Lindenberg Aerosol Characterization Experiment (LACE 98).

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Main Results:

  • Clean marine boundary layer: effective radius (0.64 µm), low real refractive index (1.45), negligible imaginary part, single-scatter albedo (0.98).
  • Continental polluted layer: effective radius (<0.2 µm), real refractive index (~1.6), imaginary part (~0.03i), single-scatter albedo (0.84).
  • Biomass burning layer: effective radius (~0.24 µm), real refractive index (>1.6), imaginary part (~0.04i), single-scatter albedo (0.81).

Conclusions:

  • Lidar measurements effectively characterize tropospheric aerosol properties.
  • Aerosol optical properties vary significantly with origin and atmospheric conditions.
  • Results show excellent agreement with sunphotometer and in situ measurements.