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The HSRL, one of two lidar systems that operates at the UW, consists of the following subsystems: transmitter, receiver, and data acquisition. These systems are integrated together in a semi-trailer to facilitate portable, remote measurements of atmospheric optical properties. Atmospheric particulates (i.e., aerosol and molecules) scatter the light away from the beam path. The backscatter component is subsequently collected by the detection system for analysis. This ability, coupled with a unique filter and detection design, offers the capability to measure aerosol and molecular backscatter and depolarization, and gauge the magnitude of particle sizes by measuring multiply-scattered events. A brief overview of the HSRL instrumentation follows, a detailed description can be found in the literature (Piironen, 1994; Piironen and Eloranta, 1994).