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Proceedings Paper

Inversion algorithm validation of 1.57-μm double-pulse IPDA lidar for atmospheric CO2 measurement
Author(s): Yadan Zhu; Xiaopeng Zhu; Decang Bi; Jiqiao Liu; Weibiao Chen
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Paper Abstract

Airborne integrated path differential absorption (IPDA) lidar system is an important instrument to verify the performance and data inversion methods of future space-borne lidar systems for atmospheric CO2 measurement. A ground vertical path validation experiment of atmospheric CO2 measurement by an airborne double-pulsed 1.57-μm IPDA lidar has been implemented. The experiment was carried out and temperature, pressure and humidity profiles of Local Meteorological Station at almost the same time are adopted. Backscattering signals from clouds at altitudes of nearly 5 km were received. To avoid the influence of stray light from mirrors, the energy monitoring signal was delayed through the 200 m multimode fiber. But it is interfered by the aerosol scattering echo signals. Inversely, considering the stray light as monitoring signal, the inversion result of XCO2 is pretty good. Six methods are studied and compared to reduce the bias and improve the CO2 column-averaged dry-air mixing ratio (XCO2) accuracy. The “PIM, AVD” and “PIM, AVX” methods are more effective when clouds are acted as hard target. The mean value of lidar measured XCO2 calculated by “PIM, AVD” and “PIM, AVX” methods is 409.63 ppm. The average value of in-situ instrument UGGA is 411.05 ppm over the same period. The bias between IPDA lidar and UGGA is -1.42 ppm. With averaging 148 shots, the standard deviation of XCO2 of the IPDA lidar system is 3.68 ppm.

Paper Details

Date Published: 19 November 2019
PDF: 8 pages
Proc. SPIE 11185, Optical Design and Testing IX, 111851E (19 November 2019); doi: 10.1117/12.2538811
Show Author Affiliations
Yadan Zhu, Shanghai Institute of Optics and Fine Mechanics (China)
Xiaopeng Zhu, Shanghai Institute of Optics and Fine Mechanics (China)
Decang Bi, Shanghai Institute of Optics and Fine Mechanics (China)
Jiqiao Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Weibiao Chen, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)


Published in SPIE Proceedings Vol. 11185:
Optical Design and Testing IX
Yongtian Wang; Pablo Benítez; Osamu Matoba, Editor(s)

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