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Abstract
A possibility of monitoring greenhouse gases (CO2 and H2O) along horizontal paths in the troposphere with two-channel near-IR lidar system based on an absorption spectroscopy measurement technique is estimated. The main units and components of the IR lidar under development are described. A backscattered signal is simulated in the informative range of IR lidar for sensing target greenhouse gases.
Highlights
Intensifying anthropogenic impact on the atmosphere increases both the concentrations of harmful gases and the total content of greenhouse gases
The development of approaches and tools for sounding H2O and CO2 is of interest, which stimulates works on the development of a corresponding two-channel lidar system for recording backscattered radiation at IAO SB RAS
Two channels for recording lidar signals are based on absorption spectroscopy techniques: – the differential absorption and scattering method (DAS) [3, 4], which ensures spatially resolved lidar signals and allows retrieving the concentration of target gases at a certain section of the sounding path;
Summary
Intensifying anthropogenic impact on the atmosphere increases both the concentrations of harmful gases and the total content of greenhouse gases. The increase in the total content of greenhouse gases is a determining factor of the climate change. The main greenhouse gases are water vapor (H2O), carbon dioxide (CO2), methane (CH4), and ozone (O3). Ozone sounding is commonly limited to the UV region. At V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences (IAO SB RAS) methane is sounded in the IR region by lidar systems designed at the Institute [1, 2]. The development of approaches and tools for sounding H2O and CO2 is of interest, which stimulates works on the development of a corresponding two-channel lidar system for recording backscattered radiation at IAO SB RAS. The results of the development and testing of this system make it possible to estimate, correct, and reduce measurement errors of CO2 and H2O vapors along horizontal tropospheric paths using absorption spectroscopy techniques
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