Influence of observational missing on harmonic constants analyzed by the least squares method

Chikara TSUCHIYA, Kohei INO, Takahiro KON, Rika NOZAWA, Shinji SUGIYAMA

Presentation information

[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-OS Ocean Sciences & Ocean Environment

[A-OS15] Ocean circulation and material cycle in coastal seas

Fri. Jun 4, 2021 9:00 AM - 10:30 AM Ch.09 (Zoom Room 09)

convener:Naoki Furuichi(Fisheries Technology Institute, Japan Fisheries Research and Education Agency), Akihiko Morimoto(Ehime University), Kazuhiko Ichimi(Faculty of Agriculture, Kagawa University), Daisuke Takahashi(Tokai University), Chairperson:Naoki Furuichi(Fisheries Technology Institute, Japan Fisheries Research and Education Agency), Akihiko Morimoto(Ehime University), Tomaso Esposti Ongaro(Istituto Nazionale di Geofisica e Vulcanologia, Italy), Sakshi Ramesh Shiradhonkar (Department of Environment Systems, University of Tokyo)

10:15 AM - 10:30 AM

[AOS15-06] Influence of observational missing on harmonic constants analyzed by the least squares method

*Chikara TSUCHIYA¹, Kohei INO¹, Takahiro KON¹, Rika NOZAWA¹, Shinji SUGIYAMA¹ (1.Hydrographic and Oceanographic Department, Japan Coast Guard)

Keywords:Tide, Wave Glider

Japan Coast Guard operates GNSS observations using Autonomous Ocean Vehicles (AOVs) in order to determine the chart datum precisely using tidal time series of that period is more than one year. The obtained time series can have long observational missing because AOVs may locate out of the planning area due to the limitation of the driving force and power supply of the AOV. In this study, a necessary condition of the observation period to obtain reliable harmonic constants by analyzing responce of the harmonic constants by the harmonic analysis based on the least squares method to the duration of missing values is discussed.