Opened 20 months ago
Closed 20 months ago
#2729 closed Bug (fixed)
Restartability failure of model configurations with embedded sea ice
| Reported by: | smueller | Owned by: | smueller |
|---|---|---|---|
| Priority: | low | Milestone: | |
| Component: | SI3 | Version: | v4.0.* |
| Severity: | minor | Keywords: | sea-ice, VVL |
| Cc: |
Description
Context
A restartability test of a modified ORCA2_ICE_PISCES configuration with embedded instead of levitating sea-ice (ln_ice_embd = .true.) fails.
Analysis
The differences between corresponding restarted and non-restarted model runs appear to stem from the resetting of e3t_n and e3t_b values to e3t_0 values in grid cells where tmask is zero (source:/NEMO/releases/r4.0/r4.0-HEAD/src/OCE/DOM/domvvl.F90#L823) during model restarts of configurations without linear free surface (ln_linssh = .false.). During the initialisation of model configurations with ln_ice_embd = .true. and ln_linssh = .false., however, the update of the vertical scale factors due to the presence of sea ice and snow (source:/NEMO/releases/r4.0/r4.0-HEAD/src/ICE/iceistate.F90#L419) includes adjustments in grid cells where tmask is zero.
Fix
The adjustment of the vertical scale factors in grid cells where tmask is zero in subroutine ice_istate of module iceistate seems to be unnecessary, and after excluding these adjustments, for example with the modification
-
src/ICE/iceistate.F90
416 416 ELSEWHERE ; z2d(:,:) = 1._wp ; END WHERE 417 417 ! 418 418 DO jk = 1,jpkm1 ! adjust initial vertical scale factors 419 e3t_n(:,:,jk) = e3t_0(:,:,jk) * z2d(:,:)419 e3t_n(:,:,jk) = e3t_0(:,:,jk) * ( z2d(:,:) * tmask(:,:,jk) - ( tmask(:,:,jk) - 1.0_wp ) ) 420 420 e3t_b(:,:,jk) = e3t_n(:,:,jk) 421 421 e3t_a(:,:,jk) = e3t_n(:,:,jk) 422 422 END DO
the restartability test is successful.
Commit History (1)
| Changeset | Author | Time | ChangeLog |
|---|---|---|---|
| 15405 | smueller | 2021-10-19T20:29:49+02:00 | Correction of the initial vertical-scale-factor adjustment due to embedded sea ice (ticket #2729) |
Change History (4)
comment:1 Changed 20 months ago by smueller
comment:2 Changed 20 months ago by smueller
In 15405:
comment:3 Changed 20 months ago by smueller
- Owner set to smueller
- Status changed from new to assigned
comment:4 Changed 20 months ago by smueller
- Resolution set to fixed
- Status changed from assigned to closed
source:/NEMO/releases/r4.0/r4.0-HEAD@15405 has passed the standard SETTE tests.
It has been pointed out that the adjustment of the vertical scale factors at source:/NEMO/releases/r4.0/r4.0-HEAD/src/ICE/iceistate.F90@14026#L419 (with and without the fix suggested above) ignores under-ice-shelf cavities. This is already being addressed in the context of ticket #2487 (see changeset [13180]).