[MITgcm-support] Stevens boundary conditions with sea ice

[Martin Losch]

Hi Kaitlin,

it means, as you have already found out, that there is no specific code for Stevens BCs for seaice and for passive tracers. Originally I had the model stop for Stevens BCs with seaice and ptracers, but now it only issues a warning. It means you’ll have to do something else for those fields. For sea ice it’s usually not a problem, if your ice does not reach the boundaries. Otherwise there are a few options in the code, all not very well documented.
For passive tracers, one could add BCs a la Stevens, there’s a template in the code, but it’s not complete.

For non-linear free surface, I added a hack (d eta / d n = 0), which works for me usually.

Bottom line: I need to update the documentation to describe this.

Martin

> On 18. May 2018, at 17:21, Naughten, Kaitlin A. <kaight at bas.ac.uk> wrote:
> 
> Hello,
> 
> I am interested in the Stevens boundary conditions, and see from the user guide (http://mitgcm.org/public/r2_manual/latest/online_documents/node236.html#SECTION00731550000000000000) that "passive tracers, sea ice and non-linear free surface are not supported properly". (I'm not sure if this is up-to-date, but I checked in the Stevens OBC code and don't see anything about sea ice).
> 
> Does this mean that applications with sea ice should not use Stevens boundary conditions at all? Or is it safe to use Stevens boundary conditions, but users should be aware that it does not apply to the sea ice fields?
> 
> Many thanks,
> Kaitlin Naughten
> 
> This message (and any attachments) is for the recipient only. NERC is subject to the Freedom of Information Act 2000 and the contents of this email and any reply you make may be disclosed by NERC unless it is exempt from release under the Act. Any material supplied to NERC may be stored in an electronic records management system.
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support