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Accurate imaging and prediction of Kanmon Strait tidal current structures by the coastal acoustic tomography data
Author(s) -
Lin Ju,
Kaneko Arata,
Gohda Noriaki,
Yamaguchi Keisuke
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl022914
Subject(s) - tomography , geology , data assimilation , geodesy , current (fluid) , inversion (geology) , ocean current , horizontal resolution , range (aeronautics) , meteorology , seismology , oceanography , climatology , physics , tectonics , optics , materials science , composite material
The Kanmon Strait acoustic tomography data acquired at a 5‐min interval are assimilated sequentially into a 2D ocean model on the basis of the ensemble Kalman filter scheme to image strong tidal current structures occurring in the strait. When the accurate range‐averaged currents obtained for the sound transmission lines connecting eight tomography stations are used as assimilation data, the complicated vortex‐imbedded currents are imaged with horizontal resolution and accuracy much better than the result of tomographic inversion. The assimilated currents are well compared to the shipboard ADCP data with a RMS difference of about 24 cm s −1 for both the horizontal velocity components. The assimilated volume transport across the strait also shows a good agreement with the transport estimated from the range‐averaged current on a pair of transmission lines crossing the strait, making a RMS difference of 3700 m 3 s −1 .