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A test on Lagrangian trajectoriesΒΆ

In order to understand the result concerning the relationship between the Lagrangian mean flow and dissipation, one need first to assert that the Lagrangian mean flow is well estimated. A test is to re-run the estimate of the Lagrangian trajectories and subsequent Lagrangian mean flow with a lower resolution in time (2 days instead of 1 day) and space (2/10 of a degree instead of 1/10 of a degree). The error is much smaller than the actual mean for both the zonal and meridional components (Figs. 1 and 2), which should mean that our estimate of the trajectories is not too bad. Notice that the test has been performed with the simulation (exp2_t) that has the least dissipation and the largest wave amplitude.

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Figure 1: 100-day Lagrangian mean zonal flow in the upper (a and b) and middle layer (c and d), west of (a and c) and within (b and d) the forcing area, deduced from Lagrangian trajectories with different resolution in time and space.

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Figure 2: 100-day Lagrangian mean meridional flow in the upper (a and b) and middle layer (c and d), west of (a and c) and within (b and d) the forcing area, deduced from Lagrangian trajectories with different resolution in time and space.