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• W4241359116 endingPage "1823" @default.
• W4241359116 startingPage "1823" @default.
• W4241359116 abstract "Laser radar (lidar) can be used to estimate atmospheric extinction coefficients that are due to aerosols if the ratio between optical extinction and 180° backscatter (the lidar ratio) at the laser wavelength is known or if Raman or high spectral resolution data are available. Most lidar instruments, however, do not have Raman or high spectral resolution capability, which makes knowledge of the lidar ratio essential. We have modified an integrating nephelometer, which measures the scattering component of light extinction, by addition of a backward-pointing laser light source such that the detected light corresponds to integrated scattering over 176–178° at a common lidar wavelength of 532 nm. Mie calculations indicate that the detected quantity is an excellent proxy for 180° backscatter. When combined with existing techniques for measuring total scattering and absorption by particles, the new device permits a direct determination of the lidar ratio. A four-point calibration, run by filling the enclosed sample volume with particle-free gases of a known scattering coefficient, indicates a linear response and calibration reproducibility to within 4%. The instrument has a detection limit of 1.5 × 10-7 m-1 sr-1 (∼10% of Rayleigh scattering by air at STP) for a 5-min average and is suitable for ground and mobile/airborne surveys. Initial field measurements yielded a lidar ratio of ∼20 for marine aerosols and ∼60–70 for continental aerosols, with an uncertainty of ∼20%." @default.
• W4241359116 created "2022-05-12" @default.
• W4241359116 creator A5026866130 @default.
• W4241359116 creator A5040320986 @default.
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• W4241359116 date "1999-03-20" @default.
• W4241359116 modified "2023-10-17" @default.
• W4241359116 title "Measurement of the lidar ratio for atmospheric aerosols with a 180° backscatter nephelometer" @default.
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• W4241359116 doi "https://doi.org/10.1364/ao.38.001823" @default.
• W4241359116 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18305813" @default.
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