Date of Award


Degree Type


Degree Name

Master of Science




Prof. Sica


Independent aerosol backscatter and extinction measurements with the high power-aperture Purple Crow Lidar (42.87deg N, 81.38deg W, 225 m) are obtained for the first time. This is achieved through application of a Raman-Lidar technique for determining the field of view of the rotating liquid mercury mirror, and through development of a novel method for isolating the attenuation behaviour of the low-altitude mechanical signal chopper.

Eleven nights of high-altitude (> 12 km) aerosol observations are pre­ sented with measurements of the intrinsic extinction-to-backscatter aerosol ratio (Lidar ratio). These include cirrus clouds, smoke near the tropopause from biomass burning during June-July 2002 and stratospheric aerosols from the Kasatochi volcanic eruption of August 2008. Detailed structure in the Lidar ratio, reflecting physical particle properties, is observed - in contrast to the single value often assumed by Rayleigh Lidars.

A coincidental measurement by the space-borne Calipso Lidar is found to have good agreement.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.