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Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China;Key Laboratory of Physical Oceanography, Ministry of Education, Qingdao 266003, China
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Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China
Adjoint method was used to deduce M2 tidal harmonic constants on the open boundary of the Bohai Sea by using M2 tidal harmonic constants in the inter iorregion.To improve the results of numerical simulation,the prescribed bottom friction coefficients were also adjusted by adjoint assimilation.Four experiments were car ried out.Experiment 1 uses only har monic constats at 19 tidal stations;Experiment 2 uses harmonic constants at 37 points on the T/P Satellite Tracks;Experiment 3 uses all the above data;Experiment 4 uses har monic constants at 19 tidal stations and 14 selected points on the T/P Satellite Tracks.The averaged absolute differences between the simulated and the observed are as follows respectively.For Experiment 1 the averaged absolute difference of the amplitude is 2.4 cm and the averaged absolute difference of the phaselag is 5.0°.For Experiment 2 they are 4.4 cm and 5.7°respectively.Experiment 3 gives 5.5 cm and 8.5°respectively.And Experiment 4 gives 3.3 cm and 5.6°respectively.The results of the four experiments coincide with the observed M2 tide in the Bohai Sea fairly well.