Water vapor Raman Lidar

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15 February 2018

The increasing importance of the coupling of water and aerosol cycles in environmental applications requires observation tools which allow simultaneous measurements of these two fundamental processes for climatological and meteorological studies. For this purpose, a new mobile Raman lidar, WALI (Water vapor and Aerosol LIdar), has been developed and implemented within the framework of the international HyMeX and ChArMEx programs.

Ground-based WALI lidar derived water vapour mixing ratio (WVMR) time-height series from 17 September to 28 October 2012 over Menorca.

The lidar operates with an emitted wavelength of 354.7 nm and is designed to fulfill eye-safety standards (EN 60825-1). The receiver is composed of 2 distinct detection modules using small collector telescopes of 15 cm in diameter. The total number of detection channels is six. Using short focal length refractive telescopes ensures a low altitude overlap for the lidar beams and increases the overall stability, transmittance and compactness of the instrument. The wide field-of-view (FOV) ~2.3 mrad allows a full-overlap of the transmission and reception paths beyond ~ 200‑300 m.

Sources :

Chazette, P., Marnas, F., and Totems, J. (2014), The mobile Water vapor Aerosol Raman LIdar and its implication in the framework of the HyMeX and ChArMEx programs: application to a dust transport process, Atmos. Meas. Tech., 7, 1629-1647, doi:10.5194/amt-7-1629-2014.

Chazette, P., Marnas, F., Totems, J., and Shang, X.(2014), Comparison of IASI water vapor retrieval with H2O-Raman lidar in the framework of the Mediterranean HyMeX and ChArMEx programs, Atmos. Chem. Phys., 14, 9583-9596, doi:10.5194/acp-14-9583-2014.

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