Vol. 38, issue 05, article # 11

Abstract:

Carbon dioxide (CO₂) is one of the main greenhouse gases; the study of its effect on the atmosphere on global and regional scales is of current importance. The development of technical means for remote gas analysis of the atmosphere is associated with the development of new and modernization of existing lidar sensing technologies. The paper presents the results of the development of a 2-mm pulsed differential absorption lidar system for sensing CO₂ along horizontal paths in the atmosphere. The configuration and design of the lidar components are shown. Technical characteristics of the lidar system are provided. The results of lidar measurements of the time variation in CO₂ concentration within the city of Tomsk in winter along a selected sensing path using a topographic target (forest belt) are presented. CO₂ concentrations in the range of 435.2–445.1 ppm, corresponding to the background state of the atmosphere, were retrieved from recorded lidar signals. To confirm the correctness of the lidar data, the CO₂ concentration was synchronously measured using a mobile gas analyzer. Analysis of the results shows that the error of lidar measurements of the CO₂ concentration is 1.3%. The results of the work can be useful in the design, manufacture, and modernization of pulsed IR lidar systems for remote sensing of CO₂ and other atmospheric gases.

Keywords:

lidar, carbon dioxide, atmosphere, differential absorption, remote sensing

Figures:

References:

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