An integrated system approach has been adopted at the Advanced Environment Monitoring Research Center (ADEMRC), Kwangju Institute Science and Technology (KJIST), Korea for the effective monitoring of atmospheric environment utilizing various optical remote sensing methods. A multi-channel LIDAR system has been used since December 2002 to monitor the vertical profile of atmospheric aerosol. Vertical profiles of extinction coefficient, depolarization ratio, and color ratio of atmospheric aerosols are determined from the simultaneous detection of three elastic-backscatter signals and one Raman signal backscattered by atmospheric nitrogen molecules. Ground based sunphotometer measurement provides LIDAR validation and information on the column integrated aerosol optical depth at seven different wavelengths. Optical atmospheric environment monitoring over horizontal path is also made with a Long-path DOAS system and a transmissometer. The GIST long-path DOAS system has been used to measure concentration of trace gases as well as atmospheric extinction at 550 nm. Results of aerosol optical depth determination based on satellite data retrieval are compared with the results of LIDAR and sunphotometer measurements. This paper presents the results of integrated measurements of atmospheric aerosol at Gwangju (35°10`N, 126°53`E), Korea.
A multi-wavelength lidar system that can measure simultaneously spectral extinction coefficient and depolarization ratio has been developed and tested. Some results from lidar measurements aerosol extinction coefficient, lidar ratio, and depolarization ratio of aerosols are presented. Lidar transmit system generates 20 Hz laser pulses at 355nm, 532nm, and 1064nm with an Nd:YAG laser. Backscattered light from atmospheric aerosol particles is collected with three Cassegrain type telescopes. Signal detection unit has 7-channels consisting of two 532nm channels and one 1064nm channel for measuring the stratospheric aerosols, two 532nm channels for the tropospheric aerosols, and 387nm channel for Raman scattering measurements. Aerosol observation has been conducted since December 2002 at Kwangju (35°10`N, 126°53`), Korea. Raman channel permitted better determination of optical properties of continental aerosols. The profile of the depolarization ratio is determined at 532 nm and used to investigate particle shape.