UV Rayleigh–Mie Raman Lidar for Simultaneous Measurement of Atmospheric Temperature and Relative Humidity Profiles in the Troposphere

概要

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A Rayleigh–Mie Raman lidar system at a wavelength of 355 nm has been upgraded for simultaneous measurements of atmospheric temperature, relative humidity and aerosol profiles in the troposphere. Temperature is determined from the Rayleigh spectral linewidth. Water vapor is determined from the intensity of the water vapor vibration-Raman line centered at 407 nm. A high-resolution grating is used to separate the water vapor vibration-Raman line and Rayleigh–Mie scattering spectrally from the lidar returns. Two Fabry–Perot filters with a dual-pass optical layout are used to detect the temperature changes. The measurement shows that statistical temperature errors of less than 1 K are obtained up to a height of 3.5 km, and the uncertainties of the water vapor in relative humidity are less than 10% at a height of 2.5 km when using a lidar system with 200-mJ laser energy, a 25-cm-diameter telescope and 3.5-min observation time. The performance of the lidar system is evaluated by comparison with radiosonde measurements. Close agreements are obtained between the lidar and radiosonde measurements.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2005-03-15