| 44 |
Traditionally, probably for historical reasons and the ease of |
Traditionally, probably for historical reasons and the ease of |
| 45 |
treating the Coriolis term, most standard sea-ice models are |
treating the Coriolis term, most standard sea-ice models are |
| 46 |
discretized on Arakawa-B-grids \citep[e.g.,][]{hibler79, harder99, |
discretized on Arakawa-B-grids \citep[e.g.,][]{hibler79, harder99, |
| 47 |
kreyscher00, zhang98, hunke97}. From the perspective of coupling a |
kreyscher00, zhang98, hunke97}, although there are sea ice models |
| 48 |
sea ice-model to a C-grid ocean model, the exchange of fluxes of heat |
diretized on a C-grid \citep[e.g.,][]{ip91, tremblay97, |
| 49 |
and fresh-water pose no difficulty for a B-grid sea-ice model |
lemieux09}. % |
| 50 |
\citep[e.g.,][]{timmermann02a}. However, surface stress is defined at |
\ml{[there is also MI-IM, but I only found this as a reference: |
| 51 |
velocities points and thus needs to be interpolated between a B-grid |
\url{http://retro.met.no/english/r_and_d_activities/method/num_mod/MI-IM-Documentation.pdf}]} |
| 52 |
sea-ice model and a C-grid ocean model. Smoothing implicitly |
From the perspective of coupling a sea ice-model to a C-grid ocean |
| 53 |
associated with this interpolation may mask grid scale noise and may |
model, the exchange of fluxes of heat and fresh-water pose no |
| 54 |
contribute to stabilizing the solution. On the other hand, by |
difficulty for a B-grid sea-ice model \citep[e.g.,][]{timmermann02a}. |
| 55 |
smoothing the stress signals are damped which could lead to reduced |
However, surface stress is defined at velocities points and thus needs |
| 56 |
variability of the system. By choosing a C-grid for the sea-ice model, |
to be interpolated between a B-grid sea-ice model and a C-grid ocean |
| 57 |
we circumvent this difficulty altogether and render the stress |
model. Smoothing implicitly associated with this interpolation may |
| 58 |
coupling as consistent as the buoyancy coupling. |
mask grid scale noise and may contribute to stabilizing the solution. |
| 59 |
|
On the other hand, by smoothing the stress signals are damped which |
| 60 |
|
could lead to reduced variability of the system. By choosing a C-grid |
| 61 |
|
for the sea-ice model, we circumvent this difficulty altogether and |
| 62 |
|
render the stress coupling as consistent as the buoyancy coupling. |
| 63 |
|
|
| 64 |
A further advantage of the C-grid formulation is apparent in narrow |
A further advantage of the C-grid formulation is apparent in narrow |
| 65 |
straits. In the limit of only one grid cell between coasts there is no |
straits. In the limit of only one grid cell between coasts there is no |
| 66 |
flux allowed for a B-grid (with no-slip lateral boundary counditions), |
flux allowed for a B-grid (with no-slip lateral boundary counditions), |
| 67 |
and models have used topographies artificially widened straits to |
and models have used topographies with artificially widened straits to |
| 68 |
avoid this problem \citep{holloway07}. The C-grid formulation on the |
avoid this problem \citep{holloway07}. The C-grid formulation on the |
| 69 |
other hand allows a flux of sea-ice through narrow passages if |
other hand allows a flux of sea-ice through narrow passages if |
| 70 |
free-slip along the boundaries is allowed. We demonstrate this effect |
free-slip along the boundaries is allowed. We demonstrate this effect |
| 73 |
Talk about problems that make the sea-ice-ocean code very sensitive and |
Talk about problems that make the sea-ice-ocean code very sensitive and |
| 74 |
changes in the code that reduce these sensitivities. |
changes in the code that reduce these sensitivities. |
| 75 |
|
|
| 76 |
This paper describes the MITgcm sea ice |
This paper describes the MITgcm sea ice model; it presents example |
| 77 |
model; it presents example Arctic and Antarctic results from a realistic, |
Arctic and Antarctic results from a realistic, eddy-permitting, global |
| 78 |
eddy-permitting, global ocean and sea-ice configuration; it compares B-grid |
ocean and sea-ice configuration; it compares B-grid and C-grid dynamic |
| 79 |
and C-grid dynamic solvers in a regional Arctic configuration; and it presents |
solvers and investigates further aspects of sea ice modeling in a |
| 80 |
example results from coupled ocean and sea-ice adjoint-model integrations. |
regional Arctic configuration; and it presents example results from |
| 81 |
|
coupled ocean and sea-ice adjoint-model integrations. |
| 82 |
|
|
| 83 |
|
%%% Local Variables: |
| 84 |
|
%%% mode: latex |
| 85 |
|
%%% TeX-master: "ceaice" |
| 86 |
|
%%% End: |
Parent Directory
| 
Revision Log
| 
Revision Graph
| 
Patch