Recent Upgrades of the Rotational Vibrational-Rotational Raman Lidar of RASC, Kyoto University, Japan: First Results

摘要

Measurement parameters of the RASC Raman lodar are temperature (in the troposphere and stratosphere measured with rotational Raman (RR) technique, in the stratosphere and mesosphere with integration technique), particle extinction coefficient, particle backscatter coefficient, and water vapor mixing ratio (all measured with Raman lidar technique). Recently, we implemented new interference filters, new data acquisition electronics and - for simultaneous temperature measurements with integration technique - a chopper. With the first two upgrades, the measurement resolution for tropospheric measurements could be improved significantly. Now the 1-σ statistical uncertainty of the rotational Raman temperature measurements is below 1 K up to about 16 km altitude for, e.g., 7 minutes integration time and a gliding average of 360 m of the data. In this contribution, we discuss the recent technical upgrades and illustrate the performance of the new system with measurement examples.