Abstract

At the ISTS Atmospheric Lidar Observatory on the campus of York University in Toronto, (43.8 N, 79.5 W), two lidars are being employed for atmospheric observations. One is an Nd:YAG two-wavelength (1064 and 532 nm) dual polarization Rayleigh/Mie lidar and the other is an ozone DIAL system based on a xenon chloride excimer source for the "on" (absorbed) wavelength at 308 nm with a hydrogen stimulated Raman shifter to provide the "off" (unabsorbed) wavelength at 353nm. These systems are now operated on a continuing basis for studies of both the lower and middle atmosphere. Since early July we have been observing very pronounced changes in the stratospheric returns from both lidars caused by the Pinatubo aerosols.

© 1991 Optical Society of America