ICOSWP SENSITIVITY TO SOME MODEL PARAMETERS

A short overview of the sensitivity of the ICOSWP model respect to some model parameters is presented here. The model has been run with semi-implicit two and three time level schemes, with different e-folding times, with different asselin filter parameters in the case of the three time level scheme and with different off-centering parameters in the case of the two time level scheme.

The $L_{2}$ normalized errors convergence plots for these runs show the sensitivity of the ICOSWP model. In the plots, the GME (three time level scheme, dt 90 s., asselin filter parameter 0.03) $L_{2}$ normalized errors are also represented.

FIGURE 15: CASE 5. SENSITIVITY TO THE ASSELIN FILTER PARAMETER (3 time level scheme)

ICOSWP runs for case 5, three time level scheme, e-folding time 480 s, dt 90s., asselin filter parameters 0.02,0.05, 0.1 and 0.2. Height $L_{2}$ normalized errors at day 15.

Figure 15: Case 5. ICOSWP height $L_{2}$ normalized errors at day 15 for different asselin filter parameters.

FIGURE 16: CASE 5. SENSITIVITY TO THE E-FOLDING TIME (3 time level scheme)

ICOSWP runs for case 5, three time level scheme, dt 90s., asselin filter parameter 0.1, e-folding time 240, 480 and 960 seconds. Height $L_{2}$ normalized errors at day 15.

Figure 16: Case 5. ICOSWP height $L_{2}$ normalized errors at day 15 for different e-folding times (3 time level scheme).

FIGURE 17: CASE 5. SENSITIVITY TO THE OFF-CENTERING PARAMETER (2 time level scheme)

ICOSWP runs for case 5, two time level scheme, off-centering parameter 0.55, dt 90 s, e-folding time 480 and 960 seconds. Height $L_{2}$ normalized errors at day 15.

Figure 17: Case 5. ICOSWP height $L_{2}$ normalized errors at day 15 for different e-folding times (2 time level scheme).

FIGURE 18: CASE 5. SENSITIVITY TO THE E-FOLDING TIME (2 time level scheme)

ICOSWP runs for case 5, two time level scheme, off-centering parameter 0.55, dt 90 s, e-folding time 480 and 960 seconds. Height $L_{2}$ normalized errors at day 15.

Figure 18: Case 5. ICOSWP height $L_{2}$ normalized errors at day 15 for different e-folding times (2 time level scheme).

FIGURE 19: CASE 6. SENSITIVITY TO THE ASSELIN FILTER PARAMETER (3 time level scheme)

ICOSWP runs for case 6, three time level scheme, e-folding time 480 s, dt 90s., asselin filter parameters 0.05, 0.1 and 0.2. Height $L_{2}$ normalized errors at day 10.

Figure 19: Case 6. ICOSWP height $L_{2}$ normalized errors at day 10 for different asselin filter parameters.

FIGURE 20: CASE 6. SENSITIVITY TO THE E-FOLDING TIME (3 time level scheme)

ICOSWP runs for case 6, three time level scheme, dt 90s., asselin filter parameter 0.05, e-folding time 240, 480 and 960 seconds. Height $L_{2}$ normalized errors at day 10.

Figure 20: Case 6. ICOSWP height $L_{2}$ normalized errors at day 10 for different e-folding times (3 time level scheme).