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Atmosphere 2016, 7(7), 89;

Feasibility Study of Multi-Wavelength Differential Absorption LIDAR for CO2 Monitoring

State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China
International School of Software, Wuhan University, Wuhan 430079, China
Huawei Technologies Co., Ltd., Shenzhen 518129, China
Author to whom correspondence should be addressed.
Academic Editor: Robert W. Talbot
Received: 17 May 2016 / Revised: 21 June 2016 / Accepted: 27 June 2016 / Published: 30 June 2016
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To obtain a better understanding of carbon cycle and accurate climate prediction models, highly accurate and temporal resolution observation of atmospheric CO2 is necessary. Differential absorption LIDAR (DIAL) remote sensing is a promising technology to detect atmospheric CO2. However, the traditional DIAL system is the dual-wavelength DIAL (DW-DIAL), which has strict requirements for wavelength accuracy and stability. Moreover, for on-line and off-line wavelengths, the system’s optical efficiency and the change of atmospheric parameters are assumed to be the same in the DW-DIAL system. This assumption inevitably produces measurement errors, especially under rapid aerosol changes. In this study, a multi-wavelength DIAL (MW-DIAL) is proposed to map atmospheric CO2 concentration. The MW-DIAL conducts inversion with one on-line and multiple off-line wavelengths. Multiple concentrations of CO2 are then obtained through difference processing between the single on-line and each of the off-line wavelengths. In addition, the least square method is adopted to optimize inversion results. Consequently, the inversion concentration of CO2 in the MW-DIAL system is found to be the weighted average of the multiple concentrations. Simulation analysis and laboratory experiments were conducted to evaluate the inversion precision of MW-DIAL. For comparison, traditional DW-DIAL simulations were also conducted. Simulation analysis demonstrated that, given the drifting wavelengths of the laser, the detection accuracy of CO2 when using MW-DIAL is higher than that when using DW-DIAL, especially when the drift is large. A laboratory experiment was also performed to verify the simulation analysis. View Full-Text
Keywords: feasibility study; multi-wavelength; differential absorption LIDAR; CO2 monitoring feasibility study; multi-wavelength; differential absorption LIDAR; CO2 monitoring

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Xiang, C.; Ma, X.; Liang, A.; Han, G.; Gong, W.; Yan, F. Feasibility Study of Multi-Wavelength Differential Absorption LIDAR for CO2 Monitoring. Atmosphere 2016, 7, 89.

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