UV Rayleigh–Mie Raman Lidar for Simultaneous Measurement of Atmospheric Temperature and Relative Humidity Profiles in the Troposphere
UV Rayleigh–Mie Raman Lidar for Simultaneous Measurement of Atmospheric Temperature and Relative Humidity Profiles in the Troposphere
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DOI：
10.1143/jjap.44.1287
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发表时间：
2005-03
影响因子：
1.5
通讯作者：
Dengxin Hua;Takao Kobayashi
中科院分区：
文献类型：
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作者：
Dengxin Hua;Takao Kobayashi
波长为355nm的瑞利-米拉曼激光雷达系统已经升级，可以同时测量对流层的大气温度、相对湿度和气溶胶剖面。温度由瑞利谱线宽度确定。水蒸气是通过以407 nm为中心的水蒸气振动拉曼线的强度确定的。利用高分辨率光栅从激光雷达回波中分离水汽振动拉曼谱线和瑞利-米散射谱线。采用双通光学布局的两个法布里-珀罗滤波器检测温度变化。测量结果表明，在激光能量为200 mj、望远镜直径为25 cm、观测时间为3.5 min的激光雷达系统下，在3.5 km高度处，温度统计误差小于1 K；在2.5 km高度处，相对湿度水汽的不确定度小于10%。通过与探空仪测量结果的比较，对激光雷达系统的性能进行了评估。激光雷达和无线电探空仪的测量结果非常接近。
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.