[MITgcm-support] [EXTERNAL] viscA4Dfile in adjoint

[Martin Losch]

Also be aware that the viscFacInAd parameter didn’t work properly (didn’t do anything) for quite some time (for mom_vecinv), between checkpoint66e (2017/03/06) and checkpoint67v (2021, Jan15). See lines 380 to 389 in pkg/mom_vecinv/mom_vecinv.F
With current code you need to define AUTODIFF_ALLOW_VISCFACADJ, and the factor only applies to the prescribed 3D fields.

Martin

> On 10. Apr 2023, at 16:57, Wang, Ou (US 329B) <ou.wang at jpl.nasa.gov> wrote:
> 
> Hello,  You would specify 3D lateral and vertical biharmonic viscosity at each model grid and save them to viscA4Dfile/viscA4Zfile.
>  Best,
> Ou Wang  From: MITgcm-support <mitgcm-support-bounces at mitgcm.org> on behalf of dong.jian at studium.uni-hamburg.de <dong.jian at studium.uni-hamburg.de>
> Date: Monday, April 10, 2023 at 2:03 AM
> To: mitgcm-support at mitgcm.org <mitgcm-support at mitgcm.org>
> Subject: [EXTERNAL] [MITgcm-support] viscA4Dfile in adjoint
> Hi, MITgcm users
> I wanted to increase viscosity in an adjoint run by setting up  
> viscFacInAd in data.autodiff, and then I was asked to specify  
> viscA4Dfile/viscA4Zfile in data. Could any tell me how to have  
> viscA4Dfile?? below is the info written in the manual, but I do not  
> know how to generate it.
> 
> Best,
> Dong
> 
> 
> 
> 
> viscA4Dfile
> 
> PARM05
> 
> ' '
> 
> filename for 3D specification of lateral biharmonic viscosity  
> (divergence part) (m4/s); requires #define ALLOW_3D_VISCA4 in  
> pkg/mom_common/MOM_COMMON_OPTIONS.h
> 
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