Open Access Digital Repository of Ministry of Earth Sciences, Government of India

Aerosol-profile measurements in the lower troposphere with four-wavelength bistatic argon-ion lidar

Devara, PCS and Ernest Raj, P and Pandithurai, G (1995) Aerosol-profile measurements in the lower troposphere with four-wavelength bistatic argon-ion lidar. Applied Optics, 34 (21). pp. 4416-4425.

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The scattering properties of aerosols over a tropical urban station, Pune, India, 118° 328 N, 73° 518 E, 559 m above mean sea level2, are studied with a bistatic, multiwavelength, continuous-wave, argon-ion lidar. The scattered-intensity profiles 1up to 1000 m above ground level2 measured at four wavelengths 10.4765, 0.4880, 0.4965, and 0.5145 μm2 of the laser during November 1987-March 1990 revealed certain spectral dependence, in conformity with the Mie theory of aerosol particles. Methods for retrieving the bulk as well as the height variation of aerosol-size distribution from the inversion of angular distribution of scattered-light-intensity measurements from a constant altitude and scattered-intensity verticalprofile measurements at different wavelengths are explained. Results obtained from these approaches are presented and compared with results reported by other investigators. The deviations in the results are discussed in relation to the assumptions involved and the terrain-atmospheric conditions at the experimental station. It is found that the aerosol-size-distribution parameter is altitude dependent beside its dependence on refractive index and wavelength of incident radiation. The results of the study suggest that the information content from bistatic, multiwavelength laser scattering measurements is useful for inferring aerosol-size distribution.

Item Type: Article
Additional Information: Copyright of this article belongs to Optical Society of American (OSA)
Uncontrolled Keywords: Angular distribution; Laser theory; Optical radar; Refractive index; Scattering; Size distribution; Wavelength, Aerosol scattering; Experimental stations; Incident radiation; Information contents; Multi-wavelength lasers; Multiwavelength; Scattering property; Spectral dependences, Aerosols
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 19 May 2015 07:11
Last Modified: 19 May 2015 07:11

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