By Rayleigh Lidar Observing And Studying The Middle Atmosphere Over Wuhan

The middle atmosphere, stretching from roughly 10 to 100km altitude, is a region of complex physical, photochemical and dynamic interaction. Simultaneously, the middle atmosphere is susceptible of the solar activity. It is the transition region between the troposphere and thermosphere, and perhaps these complex interactions in the middle atmosphere will be coupled to lower atmosphere. The atmospheric activities in the middle atmosphere have an influence on the climatologic change and human activity at the lower atmosphere. On the other hand, the observational limit of custom instruments make it the least to understood region of the earth' s atmosphere. The introduction of Lidar technique provides the high temporal-spatial measurement data to deeply study the middle atmosphere. At present, the Lidar is the efficient instrument for profoundly understanding the middle atmosphere. In 1995, Wuhan institute of physics and mathematics (WIPM) successfully construct the Rayligh Lidar in Wuhan. In 2001, the WIPM Rayleigh Lidar is up-data. Upper limited height of WIPM lidar reaches 70km. In this paper, the WIPM Rayleigh Lidar is evaluated. The retrieved algorithm of Lidar is studied. By the routinely WIPM Rayleigh Lidar observation, the middle atmosphere ranging from 30-60km over Wuhan is studied. The studying results as follow:1: The working principle and technical features of the WIPM Rayleigh Lidar upgraded were presented. The sources of error for Rayleigh LIDAR measurements, their reduction and correction methods are discussed, respectively. By comparison with other instruments, the observational capability of WIPM Rayleigh Lidar is evaluated. The system errors about pile-up, SIN and alignment do not exist in WIPM Rayleigh Lidar. The system capability is credible. The accuracy of WIPM is: on 1km spatial and 1h...