Abstract
A 1.6 μm differential absorption Lidar (DIAL) system for measurement of vertical CO2 mixing ratio profiles has been developed. A comparison of CO2 vertical profiles measured by the DIAL system and an aircraft in situ sensor in January 2014 over the National Institute for Environmental Studies (NIES) in Tsukuba, Japan, is presented. The DIAL measurement was obtained at an altitude range of between 1.56 and 3.60 km with a vertical resolution of 236 m (below 3 km) and 590 m (above 3 km) at an average error of 1.93 ppm. An in situ sensor for cavity ring-down spectroscopy of CO2 was installed in an aircraft. CO2 mixing ratio measured by DIAL and the aircraft sensor ranged from 398.73 to 401.36 ppm and from 399.08 to 401.83 ppm, respectively, with an average difference of −0.94 ± 1.91 ppm below 3 km and −0.70 ± 1.98 ppm above 3 km between the two measurements.
Highlights
Before the Industrial Revolution, the atmospheric levels of carbon dioxide (CO2 ) were around280 ppm [1]
We have developed a 1.6 μm optical parametric generator (OPG)/optical parametric amplifier (OPA) transmitter and used it in a direct-detection differential absorption Light detection and ranging (Lidar) (DIAL) system to measure CO2 mixing ratio profiles [18]
We found the difference between the CO2 mixing ratio measurements to be
Summary
Before the Industrial Revolution, the atmospheric levels of carbon dioxide (CO2 ) were around. 2.0 μm, are suitable for DIAL measurements and the 1.6 μm band is the very interesting It avoids contamination from other atmospheric constituents such as water vapor. The peak absorption intensity of the 1.6 μm absorption spectrum is suitable for DIAL measurements of vertical profiles in the troposphere. Some studies have suggested using the 2.0 μm band where an absorption peak line, they are limited to measure the distribution or the column amount in the range of several hundred meters due to strong absorption [12,13,14,15]. We report a comparison of measurements of vertical distributions of CO2 mixing ratio by DIAL and the aircraft sensor
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