Research On Vertical Air Velocity And Planetary Boundary Height Detection By The Wind Profiler

Atmospheric vertical movement is the rise or sink of air caused by field inhomogeneity,which is an important physical quantity that must be considered in weather analysis and forecasting and occupies a very important position in the whole course of the atmospheric circulation variation.Atmospheric boundary layer is the air layer which is close to the surface of the earth and directly affected by it,usually for 1 to 2 km from the earth.The research of atmospheric boundary layer is of great importance to climate,air pollution diffusion problem,environmental protection and aviation security.The wind profile radar is a kind of remote sensing equipment which detects various meteorological elements and physical quantities in the atmosphere by using the scattering effect of atmospheric turbulence on electromagnetic waves.The vertical air velocity and planetary boundary layer height can be obtained through the analysis and processing of wind profile radar data.This paper take the detecting of vertical air velocity and planetary boundary layer height by the wind profile radar as targets.To solve the problem of vertical air velocity distortion by the detection of wind profile radar in terms of precipitation and the spatial-temporal continuity of the atmospheric boundary layer obtained by using wind profile radar data,this paper that based on the radar detection principle and wind profiler data product characteristics faces to the business application of vertical air velocity and planetary boundary layer height detection by the wind profile radar.The paper studies three aspects of wind profile radar data comparison and analysis,the vertical air velocity detecting by the wind profile radar based on the wavelet transform in terms of precipitation,the planetary boundary layer height detecting by the wind profile radar based on the two-dimensional wavelet transform.The main work of the paper is displayed as follows:(1)Parameters and the data characteristics of the L-band boundary layer wind profile radar and the VHF wind profile radar are compared and analyzed.In clear sky and precipitation conditions,the horizontal wind of the CFL-03 wind profile radar and the CFL-03 wind profile radar are compared.Studies are made to find and analyze the difference of the detection results.(2)The algorithm of vertical air velocity detecting by the wind profile radar based on the wavelet transform in terms of precipitation is proposed.In this algorithm,firstly,the optimal wavelet and wavelet decomposition series are chosen.Then,wavelet transform is used to process the L-band boundary layer wind profile radar echo time domain signal which contains precipitation clutter.In this step,the precipitation clutter is suppressed and the true vertical air velocity is restored.At last,the reduction results are compared with the spatiotemporal VHF wind profile radar echo data to verify the correctness of the algorithm.(3)The algorithm of planetary boundary layer height detecting by the wind profile radar based on the two-dimensional wavelet transform is proposed,which is based on the original gradient method and the covariance wavelet transform method.In this algorithm,two-dimensional wavelet transform is applied to process wind profile radar detection data.Continuous atmospheric boundary layer height in the range of time and space is obtained from the inversion results.Finally,the inversion results are compared to the sounding data to verify the validity of the method.