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Preliminary measurements of tropospheric water vapor using Raman lidar system in the Great Lakes area

Obtaining high resolution vertical profiles of water vapor is crucially important to understand short and long term global climate changes. Raman lidar technique is widely recognized as the most effective tool to study water vapor and aerosols profiles in the lower atmosphere. The Great lakes area is one of the ideal areas to study the environmental impact of water vapor and aerosols profiles on air quality due to its dynamic ecological system, and proximity to most North American industrial centers. Latest results of a newly developed water vapor Raman lidar instrument at the Environment Canada's Centre for Atmospheric Research Experiments (CARE) (44°14'02" North, 79°45'40" West) will be presented. In this study, the instrument is described and its capabilities are illustrated along with preliminary measurements. The CARE Raman lidar setup utilizes third harmonic (355 nm) output of employed YAG laser to probe aerosols, water vapor, and nitrogen profiles. By manipulating inelastic backscattering lidar signals of the Raman nitrogen channel (386.7 nm) and Raman water vapor channel (407.5 nm), a vertical profile of water vapor mixing ratio from the near ground up to 12 km geometrical altitude is deduced. Vertical profile of the backscattering ratio obtained at 1064 nm using another elastic lidar will be shown and related to the Raman lidar results.