Hong Kong Observatory currently uses a series of meteorological instruments, including long-range LIDAR (light detection and ranging) systems, to provide alerting services of low-levelwindshear and turbulence forHongKong InternationalAirport. For some events that are smaller in spatial dimensions and are rapidly changing, such as lowaltitude windshear and turbulence associated with buildings or man-made structures, it would be necessary to involvemeteorological instruments that offer greater spatial resolution. Therefore, the Observatory has set up a short-range LIDAR on the roof of the AsiaWorld-Expo during the summers over the past several years, conducting field research on the feasibility of strengthening early alerting forwindshear and turbulence over the north runway's eastern arrival runway (Runway 25RA) and developing an automated early alerting algorithm. This paper takes the pilot reports for Runway 25RA during the 2013 field research as verification samples, using different thresholds for radial wind velocity spatial and temporal changes detected by the short-range LIDAR to calculate the relative operating characteristic (ROC) curve, and analyzes its early alerting performance.
ASJC Scopus subject areas
- Atmospheric Science