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A Raman lidar to measure water vapor in the atmospheric boundary layer

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https://ir.library.oregonstate.edu/concern/articles/fj236297q

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Abstract
  • A new multi-telescope scanning Raman lidar designed to measure the water vapor mixing ratio for a complete diurnal cycle with high raw spatial (1.25 m) and temporal (1 s) resolutions is presented. The high resolution allows detailed measurements of the lower atmosphere and offers new opportunities for boundary layer research, atmospheric profiling and visualization. This lidar utilizes a multi-telescope design that provides for an operational range with a nearly constant signal-to-noise ratio, which allows for statistical investigations of atmospheric turbulence. This new generation ground-based water vapor Raman lidar is described, and first observations from the Turbulent Atmospheric Boundary Layer Experiment (TABLE) are presented. Direct comparison with in-situ point measurements obtained during the field campaign demonstrate the ability of the lidar to reliably measure the water vapor mixing ratio. Horizontal measurements taken with time are used to determine the geometric characteristics of coherent structures. Vertical scans are used to visualize nocturnal jet features, layered structures within a stably stratified atmosphere and the internal boundary layer structure over a lake.
  • Keywords: Atmospheric Boundary Layer, Water Vapor, Raman Lidar
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  • Froidevaux, M., Higgins, C. W., Simeonov, V., Ristori, P., Pardyjak, E., Serikov, I., . . . Parlange, M. B. (2013). A raman lidar to measure water vapor in the atmospheric boundary layer. Advances in Water Resources, 51, 345-356. doi:10.1016/j.advwatres.2012.04.008
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  • 51
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  • The authors gratefully acknowledge funding from the Swiss Science Foundation and the NCCR MICS (Mobile Information Communications Systems).
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