Abstract
A variational data assimilation using the adjoint equations is applied into a one-dimensional oceanic Ekman layer model to estimate some physical parameters of the ocean model. At first, the effects of the computational conditions such as data intervals in time and space, and initial values of control variables to the model results were investigated through the identical twin experiments in which the pseudo observation data generated by the oceanic model were used. Next, the in-situ current data measured in the sea off Fukushima were assimilated into the model. The results showed the vertical eddy viscositiy coefficients were in order of 10-3 (m2/s) and the surface wind drag coefficient was about 1.0x10-3.
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