Abstract
A polarized micropulse lidar (P-MPL) employing a pulsed laser at 532 nm was developed by the Institute of Oceanographic Instrumentation, Qilu University of Technology (Shandong Academy of Sciences). The optomechanical structure, technical parameters, detection principle, overlap factor calculation method, and inversion methods of the atmospheric boundary layer (ABL) depth and depolarization ratio (DR) were introduced. Continuous observations using the P-MPL were carried out at Xi’an Meteorological Bureau, and the observation data were analyzed. In this study, we gleaned much information on aerosols and clouds, including the temporal and spatial variation of aerosols and clouds, aerosol extinction coefficient, DR, and the structure of ABL were obtained by the P-MPL. The variation of aerosols and clouds before and after a short rainfall was analyzed by combining time-height-indication (THI) of range corrected signal (RCS) and DR was obtained by the P-MPL with profiles of potential temperature (PT) and relative humidity (RH) detected by GTS1 Digital Radiosonde. Then, the characteristics of tropopause cirrus cloud were discussed using the data of DR, PT, and RH. Finally, a haze process from January 1st to January 5th was studied by using aerosol extinction coefficients obtained by the P-MPL, PT, and RH profiles measured by GTS1 Digital Radiosonde and the time-varying of PM2.5 and PM10 observed by ambient air quality monitor. The source of the haze was simulated by using the NOAA HYSPLIT Trajectory Model.
Highlights
Atmospheric aerosols are microscopically small particles and mainly suspended in the lower troposphere [1,2]
Using the data of the P-MPL combined with the data of GTS1 Digital Radiosonde and the ambient air quality monitor, the aerosols and clouds in different weather conditions are studied
In the inversion of atmospheric boundary layer (ABL) depth, the gradient data of P-MPL obtained by three inversion algorithms are compared with the profiles of potential temperature (PT) and relative humidity (RH) obtained by a GTS1 Digital
Summary
Atmospheric aerosols are microscopically small particles and mainly suspended in the lower troposphere [1,2]. They play an important role in the energy balance of the. Space Administration (NASA) carrying a dual-wavelength (532 nm and 1064 nm) lidar for the study of global clouds and atmospheric aerosols. A polarized micropulse lidar (P-MPL), designed and developed by the Institute of Oceanographic Instrumentation, Qilu University of Technology (Shandong Academy of Sciences) for measurements of aerosols and clouds in an automatic and continuous mode, was deployed at Xi’an Meteorological Bureau (34◦ 180 N, 108◦ 560 E) for operational observation. The purpose of the observation campaign is mainly to study the optical and polarization characteristics of urban aerosols and clouds. Some observation results in different weather conditions are presented and discussed
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