Observation Analysis of Wind Shear Characteristics from Troposphere Wind Profiler

Observed data of each sampling height from P-band troposphere type □ wind profiler in Sichuan Yanyuan station(2466m ASL) and Qianwei station(486m ASL) in March 2018 is taken to study the temporal and spatial characteristics as well as the differences of wind shear from troposphere wind profiler at different altitudes. The values of horizontal wind speed and wind direction obtained by wind profiler are used to calculate the wind shear index at different time and different altitudes based on the power-law formula. By calculating vector difference and fitting the index on account of least square method, the vertical wind shear characteristics over the two stations are analyzed and compared with the products measured by wind profiler. The results show that the algorithm of wind shear index based on the power-law formula can preferable to reflect the wind shear characteristics of the wind field. The wind shear index tends to decrease with the increase of altitude because of the influence of the underlying surface on the wind speed. In addition, wind shear index also shows a trend of smaller in daytime, larger at night, smaller in plain area and larger in hilly area.