Analysis of some atmospheric parameters obtained by Chiba University PAL system

• Main Author: Bagtasa, Gerry
• Format: text
• Language: English
• Published: Animo Repository 2003
• Subjects: Atmospheric pressure > Measurement; Optical radar; Laser communication systems; Physics
• Online Access: https://animorepository.dlsu.edu.ph/etd_masteral/3110; https://animorepository.dlsu.edu.ph/cgi/viewcontent.cgi?article=9948&context=etd_masteral
• Institution: De La Salle University

Some meteorological parameters obtained by a compact Mie Lidar system called Portable Automated Lidar (PAL) is presented in this study. The eye-safe system operating at 532nm showed capability for long term unaided measurements of atmospheric phenomena in the lower troposphere. The system (35'31'N, 140'04'E) is remotely controlled and accessed via the internet. Software was developed to determine the boundary layer height, cloud base height, extinction coefficient and derivation of rain drop size during precipitation in the Lidar data. The boundary layer height was derived using the Normalized Concentration Gradient and the cloud base height was determined by the slope method. Boundary layer heights were observed at an altitude of about 1km above the ground. Fernald's inversion method was used in deriving the extinction coefficient, and together with the range squared corrected Lidar signal, both were related to ground based B-ray SPM (Suspended Particulate Matter) dust counter for comparison. An average factor of 0.0055 relates the SPM concentration to the derived extinction coefficient. A good consistency was found in the Lidar vs. SPM comparison which makes the PAL a suitable tool for tropospheric monitoring. Rain drop size determination also showed consistency with ground base precipitation measurements.