[MITgcm-support] external forcing

Martin Losch mlosch at awi-bremerhaven.de
Fri Nov 3 03:22:28 EST 2006 

Riema,
open boundary conditions are precribed via the obcs (open boundary  
conditions) package. In the internal_wave experiment the main driver  
obcs_calc.F is modified (see the code directory) to hardwire the open  
boundary conditions, (but not for eta/sea surface elevation as far as  
I can see). Alternatively you could create input files with the open  
boundaries (see, e.g. exp4)

Martin

On 3 Nov 2006, at 07:05, Riema Rachmayani wrote:

> dear MITgcm,
>
> in verification of internal wave, ridges driven by large amplitude  
> barotropic tidal currents imposed through open boundary conditions  
> right?? its mean one of external force which is utilized is sea  
> surface (elevation) at open boundary?? where MITgcm describe it?? i  
> have seen external_forcing.F, but there was no elevation mentioned  
> there....
>
> thank you,
> regards,
> rima
> ----- Original Message ----
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> To: mitgcm-support at mitgcm.org
> Sent: Friday, November 3, 2006 12:00:07 AM
> Subject: MITgcm-support Digest, Vol 41, Issue 3
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> Today's Topics:
>
>    1. units of [U,V,W]THMASS (Dimitris Menemenlis)
>    2. Re: units of [U,V,W]THMASS (Jean-Michel Campin)
>    3. Re: units of [U,V,W]THMASS (Dimitris Menemenlis)
>    4. evaporation fields:  supply or estimate? (Jill N Schwarz)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 01 Nov 2006 17:11:58 -0800
> From: Dimitris Menemenlis <menemenlis at sbcglobal.net>
> Subject: [MITgcm-support] units of [U,V,W]THMASS
> To: MITgcm Support <mitgcm-support at mitgcm.org>,    Denis Volkov
>     <dvolkov at caltech.edu>
> Message-ID: <454945DE.6070909 at sbcglobal.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Are units of [U,V,W]THMASS K*m/s or C*m/s
> available_diagnostics.log says K*m/s
> but diagnostics_fill_state.F appears to compute C*m/s
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 1 Nov 2006 20:57:22 -0500
> From: Jean-Michel Campin <jmc at ocean.mit.edu>
> Subject: Re: [MITgcm-support] units of [U,V,W]THMASS
> To: mitgcm-support at mitgcm.org
> Message-ID: <20061102015722.GA20187 at ocean.mit.edu>
> Content-Type: text/plain; charset=us-ascii
>
> Hi Dimitri,
>
> cut & past from available_diagnostics.log (from an oceanic set-up):
>   46 |UTHMASS | 15 |UU   047MR      |degC.m/s        |
>   47 |VTHMASS | 15 |VV   046MR      |degC.m/s        |
>   48 |WTHMASS | 15 |WM      LR      |degC.m/s        |
>   52 |UVELTH  | 15 |UU   053MR      |degC.m/s        |
>   53 |VVELTH  | 15 |VV   052MR      |degC.m/s        |
>   54 |WVELTH  | 15 |WM      LR      |degC.m/s        |
> Could it be that your "available_diagnostics.log" is old ?
> or your version of code is old ?
>
> Jean-Michel
>
> On Wed, Nov 01, 2006 at 05:11:58PM -0800, Dimitris Menemenlis wrote:
> > Are units of [U,V,W]THMASS K*m/s or C*m/s
> > available_diagnostics.log says K*m/s
> > but diagnostics_fill_state.F appears to compute C*m/s
> > _______________________________________________
> > MITgcm-support mailing list
> > MITgcm-support at mitgcm.org
> > http://mitgcm.org/mailman/listinfo/mitgcm-support
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 01 Nov 2006 18:09:23 -0800
> From: Dimitris Menemenlis <menemenlis at sbcglobal.net>
> Subject: Re: [MITgcm-support] units of [U,V,W]THMASS
> To: mitgcm-support at mitgcm.org
> Cc: Denis Volkov <dvolkov at caltech.edu>
> Message-ID: <45495353.6020200 at sbcglobal.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Jean-Michel, thank you for quick reply.
> Yes my available_diagnostics.log file was old.
> Dimitris
>
> > Hi Dimitri,
> >
> > cut & past from available_diagnostics.log (from an oceanic set-up):
> >   46 |UTHMASS | 15 |UU   047MR      |degC.m/s        |
> >   47 |VTHMASS | 15 |VV   046MR      |degC.m/s        |
> >   48 |WTHMASS | 15 |WM      LR      |degC.m/s        |
> >   52 |UVELTH  | 15 |UU   053MR      |degC.m/s        |
> >   53 |VVELTH  | 15 |VV   052MR      |degC.m/s        |
> >   54 |WVELTH  | 15 |WM      LR      |degC.m/s        |
> > Could it be that your "available_diagnostics.log" is old ?
> > or your version of code is old ?
> >
> > Jean-Michel
>
>
>
> ------------------------------
>
> Message: 4
> Date: Thu, 02 Nov 2006 15:08:32 +0100
> From: Jill N Schwarz <jschwarz at awi-bremerhaven.de>
> Subject: [MITgcm-support] evaporation fields:  supply or estimate?
> To: mitgcm-support at mitgcm.org
> Message-ID: <4549FBE0.8020002 at awi-bremerhaven.de>
> Content-Type: text/plain; charset=us-ascii; format=flowed
>
> Hi all,
> Does anyone have an opinion/recommendation on whether it's better to
> supply reanalysis evaporation fields (along with precip/humid/wind etc
> etc), so that the mitgcm ocean surface temperature is not consistent
> with the evaporation, but the forcing fields are all consistent with
> each other, or to allow mitgcm to calculate the evaporation based on
> external humidity and insolation fields plus it's own ocean surface
> temperature?
>
> Plus, if anyone else is using ERA-40 forcing data (specifically
> evaporation, precipitation and humidity 6 hourly fields) and has a  
> 100%
> sure way of converting their 'metres of water accumulated over the
> period of the forecast' into metres/second, i'd be really grateful to
> hear how it's done- whatever i try i get values 1 or 2 orders of
> magnitude higher than the mitgcm exf_check_range expected ranges  
> recommends.
>
> Cheers,
> jill.
>
>
> ------------------------------
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