[MITgcm-support] Horizontal component of the Coriolis force

[Martin Losch]

Bertrand,

quasihydrostatic = .TRUE.,
will add extra terms to the momentum equations, included the Coriolis terms that you are looking for.
the flag ist used in model/src/calc_phi_hyd.F where s/r mom_quasihydrostatic is called (code in pkg/mom_common); in the latlter routine use3dCoriolis is also used.

From my reading of the code (set_defaults.F, and ini_parms.F where the main namelists are read and these parameters are set), use3dCoriolis is True by default (before the namelists are read), but set to false if not required (e.g. when nonhydrostatic or quasihydrostatic=False). So if you set it to True but quasihydrostatic=false, you will not get it. I think use3dCoriolis is one of the flags that are really only there for internal book-keeping. Not sure, why it is in the namelist.

In general, not all parameters of the code are described in the manual (in fact not even all code), because we are alway behind with the documentation.

Martin

> On 22 Nov 2016, at 03:35, Bertrand Louis Rene Delorme <bdelorme at stanford.edu> wrote:
> 
> Hi,
> 
> First, a huge thank to the MITgcm community for providing such fast and accurate answers to the issues users are facing.
> 
> In my case, I would like to run an experiment without the traditional approximation, i.e. accounting for the horizontal component of the Coriolis force (or cosinus-of-latitude Coriolis term). Based on the MITgcm User Manual, I thought that I would just need to turn on the flag “quasiHydrostatic”. However, I cannot find any routine where this boolean is called and thus do not understand very well what it does. Yet, I found another boolean, “use3dCoriolis”, which seems to do what I want but this boolean does not appear in the User Manual. Would someone have any precisions on the implications, differences and similarities of “quasiHydrostatic” and “use3dCoriolis”?
> 
> Thank you,
> 
> Bertrand
> 
>  
> 
>  
> 
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support