Abstract
Aiming at the detection of water vapor mixing ratio, particle linear depolarization ratio, extinction coefficient and cloud information, the Water vapor, Cloud and Aerosol Lidar (WVCAL) was developed by the lidar group at Ocean University of China. The Lidar consists of transmitting subsystem, receiving subsystem, data acquisition and controlling subsystem and auxiliary subsystem. These parts were presented and described in this paper. For the measurement of various physical properties, three channels including Raman channel, polarization channel and infrared channel are integrated in this Lidar system. In this paper, the integration and working principle of these channels is introduced in details. Finally, a measurement example which was operated in coastal area-Qingdao, Shandong province, during 2014 is provided.
Highlights
Water vapor has a great impact on the determination of weather and climate due to its fundamental role in the radiative energy transfer, hydrological cycle, and atmospheric chemistry processes [1]
The wavelength of 354.7 nm was used for exciting Raman signal of nitrogen and water vapor
After the coupling of fiber, the Raman signal was delivered to the spectrophotometer system and separated as Nitrogen Raman signal and Water vapor Raman signal
Summary
Water vapor has a great impact on the determination of weather and climate due to its fundamental role in the radiative energy transfer, hydrological cycle, and atmospheric chemistry processes [1]. The correspondingly large temporal and spatial variability in the aerosol characteristics are the main reasons for the high uncertainties in our quantitative understanding of the role of atmospheric aerosol in environmental, weather, and climate-related processes [2]. Ansmann et al set up a polarization Lidar to distinguish ice clouds from water clouds and to identify layers with ice crystals in mixed–phase clouds [8]. June 2012 and was deployed to a field test on July 2013. This Lidar is set up on an optical platform and housed in a weather-proof cabinet.
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