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10.21.10: Decomposition into the surface and interior mode in the Gulf Stream

I show here some results concerning the decomposition into surface and interior modes for the Gulf Stream region (63°E-53°E and 30°N-40°N) for one snapshot (2004/1/3) of the OFES model. These results are comparable to those in Lapeyre (2009; his Fig. 2). Notice also that the use of a different method of mirroring the fields does not change much this diagnostic.


Figure 1: Root mean squared (rms) of (a) the streamfunction and (b) potential density anomalies. Only wavelengths less than 400 km are kept. 18 interior modes are used. The amplitude of the surface mode is calculated using the upper 400 m. The matlab file is OFES_surf_normal_mode_decomp_297E_307E_30N_40N_20040103.mat in RESEARCH/PROJECTS/MARINE_BIOLOGY/SUBMESOSCALE_PROCESSES/Decomp_Surface_Normal_Modes/analysis/OFES_qscat_0_1_global_3day and was computed with main_script_1.m.


Figure 2: Same as Fig. 1 except that method 1 to mirror the fields were used.