Capability of Raman lidar for monitoring the variation of atmospheric CO2 profile
Zhao Pei-Tao(赵培涛)a)†, Zhang Yin-Chao(张寅超)b), Wang Lian(王莲)c), Hu Shun-Xing(胡顺星)a), Su Jia(苏嘉)a), Cao Kai-Fa(曹开法)a), Zhao Yue-Feng(赵曰峰)d), and Hu Huan-Ling(胡欢陵)a)
a Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; b Department of Optical Engineering, Laboratory of Photoelectric Imaging and Information Engineering, Beijing Institute of Technology, Beijing 100081, China; c Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China; d College of Physics and Electronics, Shandong Normal University, Jinan 250014, China
Abstract Lidar (Light detection and ranging) has special capabilities for remote sensing of many different behaviours of the atmosphere. One of the techniques which show a great deal of promise for several applications is Raman scattering. The detecting capability, including maximum operation range and minimum detectable gas concentration is one of the most significant parameters for lidar remote sensing of pollutants. In this paper, based on the new method for evaluating the capabilities of a Raman lidar system, we present an evaluation of detecting capability of Raman lidar for monitoring atmospheric CO$_{2}$ in Hefei. Numerical simulations about the influence of atmospheric conditions on lidar detecting capability were carried out, and a conclusion can be drawn that the maximum difference of the operation ranges caused by the weather conditions alone can reach about 0.4 to 0.5km with a measuring precision within 30ppmv. The range of minimum detectable concentration caused by the weather conditions alone can reach about 20 to 35 ppmv in vertical direction for 20000 shots at a distance of 1 km on the assumption that other parameters are kept constant. The other corresponding parameters under different conditions are also given. The capability of Raman lidar operated in vertical direction was found to be superior to that operated in horizontal direction. During practical measurement with the Raman lidar whose hardware components were fixed, aerosol scattering extinction effect would be a significant factor that influenced the capability of Raman lidar. This work may be a valuable reference for lidar system designing, measurement accuracy improving and data processing.
Accepted manuscript online:
PACS:
93.85.-q
(Instruments and techniques for geophysical research: Exploration geophysics)
Fund: Project supported by National High
Technology Development Program of China (Grant No 2002AA135030).
Cite this article:
Zhao Pei-Tao(赵培涛), Zhang Yin-Chao(张寅超), Wang Lian(王莲), Hu Shun-Xing(胡顺星), Su Jia(苏嘉), Cao Kai-Fa(曹开法), Zhao Yue-Feng(赵曰峰), and Hu Huan-Ling(胡欢陵) Capability of Raman lidar for monitoring the variation of atmospheric CO2 profile 2008 Chin. Phys. B 17 335
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