Performance analysis on the feasibility and accuracy of triple-wavelength integrated path absorption lidar for atmospheric CO₂ measurement

This study focuses on exploring the feasibility and accuracy of triple-wavelength integrated path differential absorption (IPDA) lidar to measure the atmospheric <i>C</i><i>O</i>₂ column concentration. Traditional IPDA lidar-based two wavelengths for measuring <i>C</i><i>O</i>₂ are highly dependent on meteorological parameters such as temperature, pressure, and humidity. Multi-wavelength IPDA lidar has shown potential for overcoming these challenges. By introducing a third wavelength into the IPDA lidar, we could further reduce interference from water vapor and decrease the sensitivity to atmospheric parameters, such as temperature and pressure. Simulation results indicate that the triple-wavelength IPDA lidar can significantly reduce system errors compared to the dual-wavelength lidar. The global system error is reduced by an average error of 0.156 ppm, with a mean total error of 0.517 ppm for the triple-wavelength IPDA lidar. This study provides theoretical support for the optimization and application of future lidar systems in atmospheric <i>C</i><i>O</i>₂ monitoring.