Evaluation And Application Of New Boundary Layer Meteorological Sounding System

In order to detect the atmospheric boundary layer more accurately and conveniently, a new boundary layer sounding system is introduced in this paper. In order to verify the accuracy of the equipment and its comprehensive performance, first of all, the instrument and the Vaisala RS92 radiosonde were compared with the ball test. The results show that the average measurement error corrected for temperature, pressure, relative humidity, wind speed, wind direction is only 0.35??0.20 hPa?1.17 %?0.16 m/s?-1.27°, the error range of each parameter can meet the business requirements. Secondly, leave the air boat sounding system in the summer ofthe same fellow cast ball contrast test, the results show that the average deviation of temperature, pressure and relative humidity is 0.45?, 1.60 hPa,2.51 %, to meet the business requirements. Finally, the comparison experiments were carried out in the winter with the L band sounding system.The results show that the correlation coefficient of temperature, pressure,humidity, wind speed and wind direction are more than 0.8, and the consistency of the two instruments is better. To sum up, the evaluation result of the new instrument is good, the accuracy and reliability of the instrument can meet the needs of scientific research and business.After the above evaluation of the new instrument has been done, it will be applied to the actual observation. First of all, because the new instrument using the most advanced GPS positioning technology wind, so as a comparison instrument, verify the wind profile radar, Windcube laser wind radar wind measurement data. The experimental results show that the optimal height of the wind profile radar is 1100 m or more, and the optimum height of Windcube is 750-1050 m. Secondly, the simulation results of WRF model are verified by the new instrument observation data. The results show that there is a good correlation between the two, and the simulation value is larger than the observed value. Finally, the structure of the urban boundary layer is detected by the new instrument. The results show that: 1) The maximum thickness of the summer convective boundary layer in Nanjing is about 1200m, and the stable boundary layer reaches 400m. Nanjing Chaotian Temple and Nanjing sounding station also appeared at the boundary layer rapids, this boundary layer jet has obvious "nose" structure and diurnal characteristics, appear time concentrated in midnight to early morning,rapids in the wind direction to the southwest wind The Daytime urban boundary layer development speed faster than the suburbs, and height higher than the suburbs. 2) The maximum thickness of convective boundary layer in Beijing is 2500m, and the boundary layer is up to 700m. There is a clear urban heat island phenomenon, and the night is stronger than the day, sunny days stronger than cloudy; vertical direction, UHI with height increased and weakened. The above results further show that the system can correctly reflect the evolution of boundary layer structure.