Computation of Tides in the Northeast Asian Sea by Blending the Topex/Poseidon Altimeter Data

Topex/Poseidon 고도계 자료를 이용한 북동 아시아 해역의 조석 산정

  • Kim, Chang-Shik (Korea Ocean Research & Development Institute) ;
  • Matsumoto, Koji (Division of Earth Rotation, National Astronomical Observatory) ;
  • Ooe, Masatsugu (Division of Earth Rotation, National Astronomical Observatory) ;
  • Lee, Jong-Chan (Korea Ocean Research & Development Institute)
  • 김창식 (한국해양연구원 연안 항만 공학연구본부) ;
  • ;
  • ;
  • 이종찬 (한국해양연구원 연안 항만 공학연구본부)
  • Published : 2001.02.28

Abstract

Tidal computations of $M_2,\;S_2,\; K_1$ and $O_1$ constituents in the northeast Asian sea are presented by blending the Topex/Poseidon (T/P) altimeter data into a hydrodynamic model with $5'{\times}5'$ resolution. A series of sensitivity experiments on a weighting factor, which is the control parameter in the blending method, are carried out using $M_2$ constituent. The weighting factor is set to be in inverse proportion to the square root of water depth to reduce noises which could occur in data-assimilative model by blending T/P data. Model results obtained by blending the T/P-derived $M_2,\;S_2,\; K_1$ and $O_1$ constituents simultaneously are compared with all T/P-track tidal data; Average values of amplitude and phase errors are close to zero. Standard deviations of amplitude and phase errors are approximately 2 cm and less than 10 degrees respectively. The data-assimilative model results show a quite good agreement with T/P-derived tidal data, particularly in shallow water region (h<250m). In deep water regions, T/P-derived tidal data show unreasonable spatial variations in amplitude and phase. The data-assimilative model results differ from T/P-derived data, but are improved to show reasonable spatial variations in amplitude and phase. In addition, the T/P-blended model results are in good agreement with coastal tide gauge data which are not blended into the model.

Keywords

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