5:15 PM - 6:30 PM
[AAS13-P09] A study on a UV-C Raman lidar for profiling the water vapor
Keywords:Raman lidar, water vapor
The UV-C water vapor Raman lidar used a 35 cm telescope to collect the vibrational Raman of water vapor (294.6 nm), nitrogen (283.6 nm), and oxygen (277.5 nm) for a laser operating at a wavelength of 266 nm. We simulated the WVMR estimation errors using the theoretical Raman signals based on the radiosonde data, assuming several ozone profiles. When the surface ozone concentrations were 60 and 0 ppb, the maximum altitudes for which the WVMR estimation errors were within 10% were 1750 m and 2150 m, respectively. Two calibration methods were investigated to convert the WVMR from the lidar signals: 1) comparison of lidar signals with WVMR profiles of radiosonde; 2) calibration of the detector efficiencies of each Raman channel by the standard calibration lamp technique. While the estimation errors of the calibration factor using the radiosonde data were 1.21 % below the surface ozone concentrations of 60 ppb, those by the standard calibration lamp techniques for the Deuterium lamp and tungsten lamp was 1.07% and 6.91%, respectively.