Optical properties of mixed aerosol layers over Japan derived with multi-wavelength Mie-Raman lidar system

- Optical properties of aerosol types were investigated using the Mie-Raman lidar.
- The size and composition of aerosols were also measured to study the mixing state.
- The derived aerosol-type optical properties were consistent with previous studies
- Mixing among different aerosol type (e.g., air pollution and dust) was indicated.
- The lidar ratio was sensitive to the particle size, depending on the mixing state.

Mixing state of aerosols and optical properties including lidar ratio, particle depolarization ratio, and Ångström exponent were investigated at Fukuoka in western Japan using a multi-wavelength Mie-Raman lidar (MMRL), various aerosol mass-concentration measurements, and a polarization optical particle counter during Winter-Spring 2015. Aerosol extinction coefficient, backscatter coefficient, and depolarization at 355 and 532 nm and attenuated backscatter coefficient at 1064 nm are obtained from the MMRL measurements. Ten aerosol episodes were classified into three categories (air pollution, mineral dust, and marine aerosol) based on aerosol mass-concentration measurements in the fine-mode (particle diameter Dp<2.5 μm) and coarse-mode (2.5 μm