[MITgcm-support] [EXTERNAL] topography with OBCS

[Matthew Mazloff]

You are sponging 40 points in. Is that the problem - is it restoring to 0 because of that?

Try with 
 OBCSsponge_Salt=.FALSE.,
 OBCSsponge_Theta=.FALSE.,

And see if that helps?

Matt


> On Jun 21, 2020, at 2:57 AM, Andreas Klocker <andreas.klocker at utas.edu.au> wrote:
> 
> Dimitris,
> What do you mean by extracting my boundary conditions at the correct location?
> cheers,
> Andreas
> 
> From: MITgcm-support <mitgcm-support-bounces at mitgcm.org <mailto:mitgcm-support-bounces at mitgcm.org>> on behalf of Dimitris Menemenlis <dmenemenlis at gmail.com <mailto:dmenemenlis at gmail.com>>
> Sent: Friday, 19 June 2020 1:12 PM
> To: MITgcm Support <mitgcm-support at mitgcm.org <mailto:mitgcm-support at mitgcm.org>>
> Subject: Re: [MITgcm-support] [EXTERNAL] topography with OBCS
>  
> Hi Andreas, are you sure that you are extracting your boundary conditions at the correct location?
> You could be off by one grid cell, which could cause this problem.  Dimitris
> 
> 
>> On Jun 18, 2020, at 6:21 PM, Andreas Klocker <andreas.klocker at utas.edu.au <mailto:andreas.klocker at utas.edu.au>> wrote:
>> 
>> Hi,
>> 
>> I am trying to set up a regional model configuration with OBCS. For some reason the model seems to introduce salinities where I actually have bathymetry (see attached figure; bathymetry left, salinities right). Salinities this low definitely do not exist in the files containing the bounday conditions. Is it necessary to set the open boundary exactly to where I have ocean, or should the bathymetry file take care of this by telling the model there should be nothing happening in case of zero water depth?
>> 
>> Here's my data.obcs file:
>> 
>> # Open-boundaries
>>  &OBCS_PARM01
>> 
>>  OB_Iwest  = 600*1,
>>  OB_Ieast  = 600*-1,
>>  OB_Jsouth = 2600*1,
>>  OB_Jnorth = 2600*-1,
>> 
>>  useOBCSsponge    = .TRUE.,
>>  useOBCSbalance   = .TRUE.,
>>  useOBCSprescribe = .TRUE.,
>> 
>>  useOrlanskiWest  = .FALSE.,
>>  useOrlanskiEast  = .FALSE.,
>>  useOrlanskiSouth = .FALSE.,
>>  useOrlanskiNorth = .FALSE.,
>> 
>>  OBWuFile = 'OWU',
>>  OBWvFile = 'OWV',
>>  OBWtFile = 'OWT',
>>  OBWsFile = 'OWS',
>> 
>>  OBEuFile = 'OEU',
>>  OBEvFile = 'OEV',
>>  OBEtFile = 'OET',
>>  OBEsFile = 'OES',
>> 
>>  OBSuFile = 'OSU',
>>  OBSvFile = 'OSV',
>>  OBStFile = 'OST',
>>  OBSsFile = 'OSS',
>> 
>>  OBNuFile = 'ONU',
>>  OBNvFile = 'ONV',
>>  OBNtFile = 'ONT',
>>  OBNsFile = 'ONS',
>> 
>> # OBCS_monitorFreq= 86400.,
>> # OBCS_monSelect = 1,
>>  &
>> 
>> # Orlanski parameters
>>  &OBCS_PARM02
>> # Cmax=0.45,
>> # cVelTimeScale=1000.,
>>  &
>> 
>>  &OBCS_PARM03
>>  Urelaxobcsinner=864000.,
>>  Urelaxobcsbound=86400.,
>>  Vrelaxobcsinner=864000.,
>>  Vrelaxobcsbound=86400.,
>>  spongeThickness=40.,
>>  &
>> 
>> Thanks in advance!
>> Andreas
>> 
>> 
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