Derivation of aerosol optical properties from multi-wavelength Sidar observations 

作成者 Kinjo, Hideki, Yabuki, M., 久世, 宏明, 竹内, 延夫
作成者の別表記 Kuze, Hiroaki, Takeuchi, Nobuo
日本十進分類法 (NDC) 512.75, 450
内容 研究概要: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 extinction-to-backscattering ratio (lidar ratio, S_1) 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 approach is a pragmatic one, and it relies on the sun photometer data simultaneously measured with the lidar data. By assuming a constant S_1 value for each wavelength in the lower troposphere, a consistent set of S_1 is determined by fitting the observed profiles to reference profiles that are relevant to the aerosol optical thicknesses from the sun photometer measurement. The second 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, S_1 parameter, complex refractive index, and aerosol size distribution. As a result, the vertical profiles of these parameters are determined along with the extinction profile.
コンテンツの種類 研究報告書 Research Paper
DCMI資源タイプ text
掲載誌情報 Proceedings of the CEReS international symposium on remote sensing of the atmosphere and validation of satellite data page.83-92 (2001)
言語 英語

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