Saturation effects in Na lidar temperature measurements

Physics

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Atmospheric Temperature, Mesopause, Optical Radar, Sodium, Temperature Measurement, Backscattering, Broadband, Laser Beams, Narrowband, Photons, Scattering Cross Sections

Scientific paper

The effects of laser-induced saturation in sodium layer on determinations of temperature and sodium density by a ground-based sodium lidar were investigated using calculations of saturation in lidar measurements near the mesopause. Special attention is given to the results concerning methods as a function of essential parameters and to a comparison of nighttime with daytime measurements in presence of laser-induced saturation. It is shown that, for nighttime measurements, it is more advantageous to use a narrow-band laser and a broad-band receiver than to use a broad-band laser and a narrow-band receiver, because the two methods are affected in different ways by the laser-induced saturation. A new method for temperature measurements is proposed for daytime measurements,

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