[MITgcm-support] Re: c51 (fwd)

[Jean-Michel Campin]

Hi Stephanie,

The modifications are generally "backward compatible",
meaning that you can use an old pickup with a more recent
version of the code. 

But here, it is the reverse that you intend to do.
There is no guarantee that this should work, and I am not
too much surprised that this does not. The pickup_cd
has been changed (between checkpoint50b_pre and checkpoint50b_post)
and could be the reason why it's not working.

Are you using the cd_scheme ?

See you,

Jean-Michel

PS: I move this discussion to the support list because Ed says it's better there.

> Date: Tue, 11 Nov 2003 11:25:24 -0500 (EST)
> From: Stephanie Dutkiewicz <stephd at ocean.mit.edu>
> Reply-To: MITgcm-devel at mitgcm.org
> To: MITgcm-devel at mitgcm.org
> Subject: [MITgcm-devel] c51 (fwd)
> 
> 
> Hi -
> I'm including a message from Samar - I gave him a setup and pickup
> file from a run I did with c51h_pre. He tried to pickup and run it with
> c48 - and it crashed.
> He then downloaded c51h_pre and it ran fine (but with some differences
> occuring).
> 
> I am also having a similar problem - I spun up a model with c51h_pre,
> and then have been trying to continue the run with tracers, but using
> c46. And it crashes almost immediately.
> 
> Have there been changes that make the model not backward compatible?
>  
> steph