Using a Pulsed Tea CO2-Lidar to Measure Atmospheric Scattering and Water Vapor

摘要

The usefulness of a pulsed CO2-TEA lidar for atmospheric remote sensing is analyzed. In a theoretical review the maximum ranges using atmospheric backscatter are investigated as well as methods for measuring the attenuation and scattering coefficients. The accuracy of the dial method for range resolved gas concentration monitoring is analyzed and an example of water vapor profiling is given. Measurements were performed with a direct detection CO2-TEA lidar. Emphasis was put on investigating the potential for single-ended extinction measurements in the 10 microns wavelength region. For horizontal paths good correlation was found between attenuation evaluated from atmospheric backscatter and from measurements against reference targets. Vertical soundings revealed a decrease in backscatter up to a factor 10 during the first kilometer. Range resolved water vapor was measured out to 1 km using a 75 m range cell.