[MITgcm-devel] Re: [MITgcm-support] obcs_apply_ptracer

[Martin Losch]

I have done the things I threatened to do, but I have not yet touched  
the seaice_obcs. Dimitris: I let you do that completely on your own.  
If you want to recover old results, you'll have to insert a  
OBCSfixTopo=.false. in data.obcs (and remove it, once you are done  
updating your stuff).

It turned out that only exp4 and seaice_obcs are actually affected by  
this change. the other experiments already had "good" topography  
(because they use Orlanski, for which this is probably absolutely  
essential).

Martin

On 24 Apr 2008, at 18:01, Martin Losch wrote:

> OK, I can do this:
> 1. change the default to OBCSfixTopo=.true.
> 2. override the default in exp4 (OBCSfixTopo=.false. in data.obcs +  
> a comment in this file, why we do this) in order to reproduce the  
> old bug
> 3. update all other experiments that are affected (dome,  
> seaice_obcs, internal_wave, tutorial_plume_on_slope)
>
> Do it now (tomorrow) or wait for Dimitris and the seaice_obcs  
> experiment? Other option is to use obcsfixtopo=.false. for  
> seaice_obcs for now until he fixes the sensitivity/timestepping  
> scheme?
>
> Martin
>
>
> On 24 Apr 2008, at 16:59, Jean-Michel Campin wrote:
>
>> Hi Martin,
>>
>> Am i right regarding exp4, that this is less an issue since
>> the gradients of bathy near obc regions are small (=> much less
>> that 1 level => no "step") + uses free slip.
>> I would then suggest to keep this one with OBCSfixTopo=.FALSE.
>> (with the comment: for backward compatibility).
>> And otherwise, kind of agree with Dimitris, we could put as a default
>> OBCSfixTopo=.TRUE., as long as we have a way to reproduce old  
>> bugs ...
>>
>> Jean-Michel
>>
>> On Thu, Apr 24, 2008 at 06:31:00AM -0700, Dimitris Menemenlis wrote:
>>> Martin, thanks!  I will definitely set OBCSfixTopo=.TRUE. for  
>>> seaice_obcs,
>>> since I need to change output.txt anyways.  It seems to me that  
>>> this switch
>>> should be .TRUE. by default and .FALSE. only if it is needed to  
>>> preserve
>>> backward compatibility with existing verification experiments.  D.
>>>
>>>
>>>> I have now "fixed" the problem that taka had; and that fix  
>>>> should also fix
>>>> the problem that you were having with seaice because my fix will  
>>>> put land
>>>> on
>>>> the boundary (online), where there is land just inside the  
>>>> domain (that's
>>>> what we concluded to do at our secret MAD/NSA conference call).
>>>>
>>>> All: I suggest that we modify at least one of the verification  
>>>> experiments
>>>> to
>>>> use this fix (OBCSfixTopo is false by default). Which one do you  
>>>> guys
>>>> suggest, maybe even seaice_obcs? Or should I change the default.  
>>>> We didn't
>>>> talk about that on the phone.
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