2:15 PM - 2:30 PM
[AOS14-03] Analysis of trajectory of drifting buoys in the Kuroshio region
Keywords:Trajectory prediction, Kuroshio, Kuroshio extention, Satellite altimetry, MOVE-JPN, Drifting buoy observation
Japan Coast Guard continues to observe Kuroshio and its extention using drifting buoys. These trajectories in the period of one day are compared trajectories calculated by the geostrophic current by satellite altimetry (CMEMS), Japan Meteorological Agency MOVE-JPN 0.1 degrees model and MOVE-JPN 2 km model. These datasets are currents of daily average.
Japan Coast Guard operates the trajectory prediction system in order to assist to decide the area of search and rescue. The question which dataset is the most suitable for this system is discussed. The trajectory prediction system adopts the total probability error, which is 13.3 km in a day for the ocean current only. When buoys locate in the Kuroshio region, February 10 - 21, February 28 - March 11, December 16 - 31 in 2023, the differences and standard deviation of the travelling distance in a day between buoys and the geostrophic current, MOVE-JPN 0.1 degrees model, MOVE-JPN 2 km model are 19.2 km ± 10.3 km, 21.7 km ± 10.9 km, and 23.1 km ± 11.8 km, respectively. Although Kuroshio which is a strong current makes larger differences than the total probability error, it is found that the reproductivility of Kuroshio is similar between these three datasets in terms of the use of the trajectory prediction system. In case of operation of the trajectory prediction system, unification of dataset improves maintanantability of the system, the implication of MOVE-JPN 2km as a suitable dataset for the system in the Kuroshio region is welcome to us.
Japan Coast Guard operates the trajectory prediction system in order to assist to decide the area of search and rescue. The question which dataset is the most suitable for this system is discussed. The trajectory prediction system adopts the total probability error, which is 13.3 km in a day for the ocean current only. When buoys locate in the Kuroshio region, February 10 - 21, February 28 - March 11, December 16 - 31 in 2023, the differences and standard deviation of the travelling distance in a day between buoys and the geostrophic current, MOVE-JPN 0.1 degrees model, MOVE-JPN 2 km model are 19.2 km ± 10.3 km, 21.7 km ± 10.9 km, and 23.1 km ± 11.8 km, respectively. Although Kuroshio which is a strong current makes larger differences than the total probability error, it is found that the reproductivility of Kuroshio is similar between these three datasets in terms of the use of the trajectory prediction system. In case of operation of the trajectory prediction system, unification of dataset improves maintanantability of the system, the implication of MOVE-JPN 2km as a suitable dataset for the system in the Kuroshio region is welcome to us.