Prediction of ocean surface current velocity and application to meteorological navigation in the North Pacific |
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Authors: | Jing Zhenhua Shi Maochong Shen Jijun |
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Institution: | (1) Ocean University of Qingdao, Qingdao, China |
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Abstract: | On the basis of an understanding of the ocean current produced under the combined forces of wind stress over the sea surface
and horizontal pressure gradient force caused by the uneven distribution of seawater density and the elevation of sea surface,
we obtained the unsteady analytic solution of the variation with time of ocean surface current velocity corresponding to the
time variation of the above two forces, and the unsteady analytic solution for variation of seawater density with time by
considering only the vertical turbulence. To meet different needs, the above solutions may be written in two forms for short
and long time predictions. After some simplification the analytic solution was used to predict surface ocean current velocity
for meteorological navigation in the North Pacific. The monthly average current field was first obtained to get the necessary
parameters for selecting the initial shipping route in the North Pacific and Bohai and Yellow Seas. The wind current field
was then calculated by means of the simplified analytic solution to provide realistic bases for prediction of the ocean surface
current field so that the optimum navigational route can be known several days in advance.
This paper was presented on the Program on “Meteorological navigation in the North Pacific” as a contribution on prediction
of ocean surface current in the North Pacific. This program won the Second Prize for Scientific-technical Progress awarded
by the National Education Committee. |
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