ラマン散乱とミー散乱を併用したレーザレーダを用いた大気観測

抄録

A laser radar system using Raman and Mie scattering for simultaneous measurement of water vapor and aerosols was developed. This system can detect Raman scattering from atmospheric nitrogen (N₂), oxygen (O₂), or water vapor (H₂O), as well as Mie-Rayleigh scattering for a laser wavelength of 280 nm. Using this system, vertical profiles of the water vapor mixing ratio were measured with about 10% accuracy for height 30-1500 m using Raman scattering from H₂O and N₂. The correction due to differential absorption by O₃ was found to be <3%. Simultaneous measurement of the water vapor mixing ratio and Mie backscatter coefficient showed that uncondensed and condensed water vapor can be identified by comparing the spatial profiles of the water vapor mixing ratio and Mie backscatter coefficient. In addition, the average O₃ concentration was obtained using Raman scattering from atmospheric N₂ and O₂.