Abstract
RALMO is operated at MeteoSwiss and provides continuous measurements of water vapor since 2008. Water vapor needs calibration to be used for climatological and meteorological studies. Primarily, RALMO is calibrated against a reference radiosonde. A secondary new calibration system based on an internal LED has been installed to perform automatic relative calibrations correcting for instrumental drifts. This study characterizes the secondary calibration system and validates it against the primary.
Highlights
The RAman Lidar for Meteorological Observations (RALMO) is operated at the Aerological station at Payerne (46°480 N, 6°560 E, 491ma.s.l.) by Federal Office of Meteorology and Climatology MeteoSwiss in collaboration with the École Polytechnique Fédérale de Lausanne (EPFL) and provides continuous measurements of water vapor, temperature and aerosols almost uninterruptedly since 2008 [1],[2]
The calibration factor obtained by scaling the ω profile obtained by RALMO to the ω profile from the radiosounding is corrected automatically by a system that accounts for the uneven aging of the N2 and
The method consists of the automatic correction of the calibration factor C obtained by external calibration of RALMO ω profile by comparison with radiosounding
Summary
The RAman Lidar for Meteorological Observations (RALMO) is operated at the Aerological station at Payerne (46°480 N, 6°560 E, 491ma.s.l.) by Federal Office of Meteorology and Climatology MeteoSwiss in collaboration with the École Polytechnique Fédérale de Lausanne (EPFL) and provides continuous measurements of water vapor, temperature and aerosols almost uninterruptedly since 2008 [1],[2]. This long time series needs careful calibration to be used for climatological studies and operational meteorology. The expression for ω can be obtained rearranging the terms in the LIDAR equation at each altitude z for H2O and N2: z
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