| 1 | ICB |
|---|
| 2 | --- |
|---|
| 3 | |
|---|
| 4 | ICB is a very idealized configuration used to test and debug the icb module. |
|---|
| 5 | The configuration is box with a shallow shelf (40m) on the east and west part of the domain with a deep central trough (> 100m). |
|---|
| 6 | ICB are generating using the test capability of the icb model along a E-W line (this can easily be tuned). |
|---|
| 7 | |
|---|
| 8 | In this configuration, ONLY the ICB module is activated. It means that: |
|---|
| 9 | - SI3 is OFF |
|---|
| 10 | - NO atmospheric fluxes. See usr routine in MY_SRC. |
|---|
| 11 | - NO time variation of ocean properties. T, S, U, V, ssh (...) are intialized and never changed in time. This is achieved by simplifying the step.F90 routine in MY_SRC. |
|---|
| 12 | |
|---|
| 13 | Resolution and Initial condition are: |
|---|
| 14 | - Homogeneous S (34) |
|---|
| 15 | - Spatially constant T set to 2 over the first 2 levels and 1 below |
|---|
| 16 | - Spatially constant (U,V) set to (1,0) over the first 2 levels and (0,1) below |
|---|
| 17 | - e3 is set to 10m |
|---|
| 18 | - iceberg thicness is set to 100 in the class tested (10 level affected). |
|---|
| 19 | - iceberg density is set to 1026 as the ocean reference density => icb tikness = icb draft (easier to evaluate the output) |
|---|
| 20 | |
|---|
| 21 | Results expected are: |
|---|
| 22 | - ln_M2016 = F => icb moving along the W direction only and pilling up on the W side of the domain. |
|---|
| 23 | - ln_M2016 = T => icb on shallow bank move at 45 degrees (NW) and 76 degrees (NNNNW) in the deeper through. |
|---|
| 24 | - ln_M2016 = T and ln_icb_grd = T => as before but now icb cannot move onto the shallow bank on the W and migrate northward along the shelf break. Some get stuck at specific point because of the grounding law (they always get back to there intial position at every time step). |
|---|
| 25 | |
|---|
| 26 | This set up allow us to easily test various option of the ICB code as: |
|---|
| 27 | - ln_M2016 (use properties in depth to compute dyn and thd) |
|---|
| 28 | - ln_icb_grd (use icb bottom level of the icb (tail) to ground the icb or not) |
|---|
| 29 | |
|---|
| 30 | It can also help us to: |
|---|
| 31 | - reproduce bugs (interpolation issue for example) |
|---|
| 32 | - develop and test new functionalities (new grounding scheme for exemple) |
|---|
| 33 | - evaluate ICB performance alone |
|---|
| 34 | |
|---|
| 35 | The side effect of the implementation is that: |
|---|
| 36 | - the run.stat (if produced) is meaningless as NEMO tracer and dynamics are not computed |
|---|
| 37 | |
|---|
| 38 | |
|---|
