光学学报, 2015, 35 (3): 0328004, 网络出版: 2015-02-04   

对流层高度大气温度、湿度和气溶胶的拉曼激光雷达系统 下载: 681次

Raman Lidar for Atmospheric Temperature, Humidity and Aerosols up to Troposphere Height
作者单位
西安理工大学机械与精密仪器工程学院, 陕西 西安 710048
摘要
为了实现大气温度、水汽(相对湿度)和气溶胶的实时同步探测研究,成功研制了一台日常观测的多参数探测拉曼激光雷达,采用高性能二向色镜和窄带干涉滤光片组成高光谱分辨率高效率拉曼分光系统,实现独立5通道大气回波信号的高精细分光和高效率提取,并研发了多参数同步反演算法,获得了大气水汽密度、温度和气溶胶消光系数廓线,结合水汽密度和温度得到了同时刻大气相对湿度的垂直变化特性。利用该系统在晴天和有云条件下对西安局地进行初步实验观测,获得温湿度及气溶胶廓线以及云层内水汽与逆温层的高度关系。实验结果表明,在探测时间15 min和激光能量150 mJ的条件下,系统在晴天条件可实现高度16 km 以下大气温度和湿度的同步探测,在有云条件下系统可实现大气底层和云层顶逆温层的精确探测,并可获得高层云层内和水汽层内大气水汽密度和相对湿度的同步增长趋势。实验数据与当地探空数据的多次随机比对在大气温度、湿度廓线上取得了较好的一致性,充分验证了该拉曼激光雷达实现对流层高度大气多参数同步探测的有效性和系统的可靠性。使用该系统可有效开展区域性大气的观测研究,为大气气候变化以及雾霾生消过程的研究提供可靠的实时探测数据。
Abstract
In order to achieve measurement of atmospheric temperature, water vapor (relative humidity) and aerosol simultaneously, a Raman lidar system has been developed, and a high-performance spectroscopic box composed of dichroic mirrors and narrow-band interference filters is used to separate the different-wavelength lidar return signal and to extract the interested return signal with high efficiency. The method is proposed for profiling the atmospheric water vapor density, temperature and aerosol extinction coefficient, and thus the profile of relative humidity is obtained. Preliminary experiments are carried out for simultaneous atmospheric parameter detection in Xi′an under clear and cloudy conditions, the vertical profiles of water vapor density, temperature, relative humidity and aerosol extinction coefficient are analyzed, and the variation in water vapor in the clouds and the inversion layer is obtained. The observed results show that under the conditions of integration time of 15 min and laser energy of 150 mJ, the effective simultaneous detection range for temperature and relative humidity achieves up to 16 km under clear condition, the temperature inversion layer is obtained in the lower atmospheric layer and at the top of the cloud layer, and synchronization increasing trend is found between water vapor density and relative humidity within the high cloud layer and water vapor layer. The obtained results are better consistent with radiosonde data in terms of the water vapor density, temperature and relative humidity profiles, which verifies the reliability of the Raman lidar to achieve real-time multi-parameter measurement up to troposphere height, and long-term observation and studies can be conducted to provide reliable data for research of climate change and haze process.

王玉峰, 高飞, 朱承炫, 何廷尧, 华灯鑫. 对流层高度大气温度、湿度和气溶胶的拉曼激光雷达系统[J]. 光学学报, 2015, 35(3): 0328004. Wang Yufeng, Gao Fei, Zhu Chengxuan, He Tingyao, Hua Dengxin. Raman Lidar for Atmospheric Temperature, Humidity and Aerosols up to Troposphere Height[J]. Acta Optica Sinica, 2015, 35(3): 0328004.

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