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Simultaneous Assimilation Model of Drifting Buoy and Altimetric Data for Ocean Surface Circulations
Awaji, Toshiyuki,Ishikawa, Yoichi,Akitomo, Kazunori 대한원격탐사학회 1996 International Symposium on Remote Sensing Vol.12 No.1
A simultaneous assimilation model of drifting buoy and altimetric data is proposed to determine the mean sea surface height(SSH) as well as the temporal evolution of the surface circulation on synoptic scales. The result shows that realistic buoy deployment (32 in a 40° square) ca.n effectively constrain the model variables; that is, both the absolute (mean plus time varying) velocity and SSH (interface depth) fields are significantly improved. Successive correction of the mean SSH is made with the simultaneous assimilation of drifting buoy and altimetric data. Consequently, a better correction of the mean SSH is obtained: The initial error of the mean SSH is reduced by approximately 40% after the 1-year experiment. These results clearly show that simultaneous assimilation of drifting buoy and altimetric data into the dynamical model is a very useful tool for improving the model's realism.
Seasonal Transport Variations in the Japan Sea
Yoshikawa, Yutakawa,Awaji, Toshiyuki,Akitomo, Kazunori 대한원격탐사학회 1995 International Symposium on Remote Sensing Vol.11 No.1
The Japan(East) Sea circulation has been examined with an $quot;incomplete$quot; robust diagnostic model. The simulated Japan Sea circulation shows strong seasonal variations, the major features being in good agreement with observational findings. To identify the sources and pathways of water masses in such a complicated current system, the Lagrangian water-mass movement is examined, providing useful informations about water-mass formation processes. The renewal time of the water masses is estimated to be at least tens years.