Temperature measurement of cloud or haze layers based on Raman rotational and vibrational spectra
Temperature measurement of cloud or haze layers based on Raman rotational and vibrational spectra
复制标题
基于拉曼旋转和振动光谱的云层或霾层温度测量
DOI：
10.1364/oe.459065
复制
发表时间：
2022
期刊：
影响因子：
3.8
通讯作者：
Tao Yang
中科院分区：
文献类型：
--
作者：
Qimeng Li;Huige Di;Dengxin Hua;yan qing;Yun Yuan;Tao Yang
纯转动拉曼激光雷达常用于大气温度廓线测量。然而，在云和霾的温度测量中，需要高的弹性散射抑制比（>10 7），这对光谱分离技术提出了严格的要求。针对这一问题，提出了一种基于振动和转动拉曼光谱的激光雷达测量技术。利用氮分子的振动和转动拉曼散射得到强弹性散射下的温度廓线，结合弱弹性散射下的双转动拉曼温度测量，可以得到包括云和霾层在内的大气温度的垂直分布。通过数值仿真验证了该方法的可行性。在西安理工大学建立了用于温度测量的拉曼激光雷达，其温度测量结果与无线电探空仪的测量结果吻合良好。该方法结合了双旋转拉曼方法的高灵敏度和振动拉曼方法的高米氏散射抑制，从而进一步提高了拉曼激光雷达对多云和有雾空气条件的适应性，支持大气和云物理研究。
Pure rotational Raman lidar is often used for atmospheric temperature profile measurements. However, high elastic scattering suppression ratios (>10 7 ) are required for temperature measurement in clouds and haze, which imposes stringent requirements on spectral separation techniques. To solve this problem, a lidar measurement technique based on vibrational and rotational Raman spectra is proposed. Using nitrogen vibrational and rotational Raman scattering to obtain temperature profiles under strong elastic scattering, combined with the dual-rotational Raman temperature measurements under weak elastic scattering, a vertical distribution of atmospheric temperature including cloud and haze layers, can be obtained. The feasibility of the method was verified by numerical simulation. The Raman lidar for temperature measurements was established in Xi'an University of Technology, and the obtained temperature results show good agreement with the radiosonde measurements. The proposed method combines the high sensitivity of the dual-rotational Raman method and the high Mie-scattering suppression of the vibrational Raman method, thus further improving the adaptability of Raman lidar to cloudy and hazy air conditions and supporting atmospheric and cloud physics research.