Derivation of aerosol optical properties from four-wavelength lidar observations

Masanori Yabuki; Hideki Kinjo; Hiroaki Kuze; Nobuo Takeuchi

doi:10.1117/12.417037

13 February 2001 Derivation of aerosol optical properties from four-wavelength lidar observations

Masanori Yabuki, Hideki Kinjo, Hiroaki Kuze, Nobuo Takeuchi

Proceedings Volume 4153, Lidar Remote Sensing for Industry and Environment Monitoring; (2001) https://doi.org/10.1117/12.417037
Event: Second International Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 2000, Sendai, Japan

Abstract

A multi-wavelength Mie lidar is a powerful tool to investigate the optical properties of aerosol particles along with their vertical profile information. In the usual analysis with the Fernald method, however, it is required to assume both the lidar ratio S1 and the extinction coefficients at the far end boundary. For a multi-wavelength lidar, appropriate choices of these parameters are indispensable to derive consistent profiles from the actual data. In this work, we propose two algorithms for the analysis of four-wavelength lidar data. The first algorithm is more comprehensive in that it adopts the direct fitting of the lidar A-scopes to the theoretical curves that are based on a look-up table: the table is pre-calculated for various combinations of the extinction coefficient, S1 parameter, complex refractive index, and aerosol size distribution. As a result, the vertical profiles of these parameters are determined along with the extinction profile. The second approach is a pragmatic one, and it relies on the sun photometer data simultaneously measured with the lidar data. By assuming a constant S1 value for each wavelength in the lower troposphere, a consistent set of S1 is determined by fitting the observed profiles to reference profiles that are relevant to the aerosol optical thicknesses from the sun photometer measurement.

Citation Download Citation

Masanori Yabuki, Hideki Kinjo, Hiroaki Kuze, and Nobuo Takeuchi "Derivation of aerosol optical properties from four-wavelength lidar observations", Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); https://doi.org/10.1117/12.417037

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KEYWORDS

LIDAR

Aerosols

Refractive index

Atmospheric modeling

Photometry

Sun

Signal attenuation

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