IMPLEMENTATION OF ROTATIONAL RAMAN CHANNEL IN MULTIWAVELENGTH AEROSOL LIDAR TO IMPROVE MEASUREMENTS OF PARTICLE EXTINCTION AND BACKSCATTERING AT 532 NM

摘要

We describe a practical implementation of rotational Raman (RR) measurements in an existing Mie-Raman lidar to obtain measurements of aerosol extinction and backscattering at 532 nm. A 2.3 nm width interference filter was used to select a spectral range characterized by low temperature sensitivity within the anti-Stokes branch of the RR spectrum. Simulations demonstrate that the temperature dependence of the scattering cross section does not exceed 1.0% in the 230-300K range making accurate correction for this dependence quite easy. With this upgrade, the NASA/GSFC multiwavelength Raman lidar has demonstrated useful a_(532) measurements and was used for regular observations. Examples of lidar measurements and inversion of optical data to the particle microphysics will be given in presentation.