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03.22.13: Long term behavior of exp2_l2

Here, I am trying to determine the overall behavior of the solution exp2_l2 in order to see where I should perform the LPV analysis. The simulation was run with a very weak wind (MAG=100), a weak horizontal dissipation (KH=10 m2/s) and with a sponge layer along the western boundary (see Summary of results from a large set of experiments). Fig. 1 shows the kinetic energy averaged within the intermediate layer. We see that after day 5000, the kinetic energy has reached a stationary steady state.

Fig. 2 shows the time series of U at 5°E and 30°N every 25 days (blue) and the corresponding 100-day running average (red). The lower panel, in particular, shows that between days 8000 and 9000, the variations around the 100-day mean are small compared to the mean itself which suggests that we might not need a lot of cycles for the time rate of change of LPV to be negligible compared to the other terms in the LPV balance.

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Figure 1: Kinetic energy averaged within the intermediate layer in exp2_l2.

../../../../../_images/U_ts.png

Figure 2: Time series of U at 5°E and 30°N every 25 days (blue) and the corresponding 100-day running average (red). The lower panel shows a zoom between days 8000 and 9000 and only the 100-day average.


Fig. 1 was done with statistically_stationary_test.m and Fig. 2 with concat_script.m in RESEARCH/MODELISATION/HIM/studies/diss_train_of_eddies/exp2/exp2_l2/analysis_1d on the main disk on ipu1.