In support of these comparisons, this study completed a comparison between observations taken from radiosondes and a 915 MHz boundary-layer wind profiler. From this comparison between radiosonde and wind profiler observations, along with the lidar/radiosonde and lidar/profiler comparisons performed previously, we will eventually be able understand how the different instruments perform in various atmospheric conditions.
Matlab was used to compare the observations taken at corresponding times and heights. Data from a ceilometer were used to further investigate events where a detailed description of the structure of the atmosphere could explain why the wind observations differed by a significant amount. To date, only data from 2010 has been analyzed. After looking through the comparisons manually for significant outliers, a set of dates where the instruments observed significantly different wind speeds was compiled for further analysis of the environmental setup. This led to a characterization of when each instrument performs best.
This study found that the 915Mhz profiler performed best during the summer, when there is more convection and mixing in the planetary boundary layer. The water vapor mixing ratio and aerosol scattering ratio mix deeper into the boundary layer in the summer months, which generally improves the performance of the profiler.