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The primary objective of this paper is to assess the relative effectiveness of data sets with different space coverage and time resolution when they are assimilated into an ocean circulation model. The authors focus on obtaining realistic numerical simulations of the Gulf Stream system typically of the order of 3-month duration by constructing a synthetic ocean simultaneously consistent with the model dynamics and the observations. The model used is the Semispectral Primitive Equation Model. We use a suboptimal assimilation technique ( nudging )