[MITgcm-support] Problems with the EXF package and binary input files

[Oliver Jahn]

Hi Dan,

I noticed one thing in your data.exf: there is only 1 value for vwind_lat_inc which is an array.  You have to provide vwind_nlat-1 values.  (This is needed for things like Gaussian grids but definitely could use more coverage in the docs!)

Oliver


On 2023-02-09 09:16, Dani Jones wrote:
> Hello MITgcm-support listers,
> 
> I am having trouble with the EXF package while trying to force a 
> regional model configuration using external fields derived from ERA5. 
> The diagnostics output from EXF shows horizontal stripes or distorted 
> results.
> 
> To set up my configuration, I followed these steps:
> 
>   * Downloaded a subset of ERA5 using the cdsapi package
>   * Regridded the data onto my model grid using the xESMF package
>   * Ran MITgcm for a few timesteps and checked the EXF diagnostics output 
> 
> I have conducted various checks and tried different approaches to 
> resolve the issue, including:
> 
>   * Examined the contents of the ERA5 data
>   * Examined the binary files for any problems
>   * Tried "on the fly" interpolation with EXF and repeatedly checked the
>     data.exf parameters
>   * Checked the precision and endian-ness throughout the entire process
>   * Created binary files using Matlab and Python
>   * Updated to the latest version of MITgcm and recompiled with the
>     -D_BYTESWAPIO flag
>   * Tried every permutation of the dimensions for the binary files 
> 
> Despite these efforts, the binary files appear to be fine, and it seems 
> that MITgcm/EXF is not reading them as expected. For further information 
> and details, I have documented this issue on GitHub with plots from the 
> diagnostics package and links to relevant files:
> 
> https://github.com/so-wise/so-wise-gyre/issues/34 
> <https://github.com/so-wise/so-wise-gyre/issues/34>
> 
> Thanks in advance for any assistance, guidance, or suggestions that you 
> can provide.
> 
> Best regards,
> Dan(i)
> 
> --
> *Dr Dan(i) Jones* • Physical Oceanographer
> Polar Oceans Team <https://www.bas.ac.uk/team/science-teams/oceans/>• 
> BAS AI Lab <https://www.bas.ac.uk/project/ai> • British Antarctic Survey 
> <https://www.bas.ac.uk/>
> Website <http://www.danjonesocean.com/> • Twitter 
> <https://twitter.com/DanJonesOcean> • they/them
> 
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