Measurement of tropospheric CO2 and aerosol extinction profiles with Raman lidar
2008
A prototype Raman lidar was designed for monitoring tropospheric
CO2 profile and other scientific investigations. The third harmonic of
Nd:YAG laser (354.7-nm wavelength) was used as stimulated light source to provide
nighttime measurements. Filter with high rejection ratio performance was used to
extract CO2 Raman signals from Rayleigh-Mie scattering signals
effectively. To improve the real time monitoring function, a two-channel signal
collection system was designed to collect CO2 and N2 Raman scattering
signals simultaneously. The N2 Raman scattering signals were used to retrieve
aerosol extinction coefficient. Typical features of CO2 concentration
profile and aerosol extinction coefficient in Hefei were presented. The mixing ratio
of atmospheric CO2 in Hefei can reach about 360-400 ppmv.
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