Lateral gradients in bgc properties in GOTM-FABM-bgc

[Mattias Cape]

Hi,

I'm working with GOTM and FABM coupled to a biogeochemical model (NPZDO), running models for sites in estuaries in the British Columbia (Canada) region. These systems exhibit strong lateral gradients in both physical and biogeochemical properties.

GOTM allows for incorporation of lateral gradients in temperature and salinity, and GOTM / FABM allows for dilution of biogeochemical properties. I wondered if there is a way to incorporate lateral gradients in biogeochemical properties, that could then be advected by GOTM. The specific application is for oxygen, with low oxygen waters advected deep into some of our estuaries of interest.

Given the importance of lateral processes, GOTM / 1D models, even with parametrized gradients, may not be the right tool for our application, as opposed to GETM or other.

Thank you.

Cheers,

Mattias

[Jorn Bruggeman]

Hi Mattias,

 

I can see the use for that. It seems to me that such functionality would ideally go into the GOTM-FABM coupling layer. It would make less sense in FABM itself, as this phenomenon is specific to 1D column models, and FABM configuration files should be portable as-is to e.g. 3D models where such a parameterisation of horizontal advection would not make sense.

 

I think this functionality could be added with some targeted changes in gotm_fabm.F90 and gotm_fabm_input.F90, more or less like the way we currently handle relaxation of pelagic tracers. Depending on your Fortran skills, you might want to try your hand at implementing and testing such changes (if you do that in a clean way, you could offer them for inclusion in GOTM master as a pull request). Alternatively, I’d consider this a feature request in search of a volunteer and/or funding.

 

Cheers,

 

Jorn

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[Karsten Bolding]

Just to add - both GOTM and FABM has an Issues page that can be used for Feature Requests as one of the standard labels is 'enhancement'. 

I'll like to promote the use of the tools Github offer - emails have become so last century :-) (writing yet another one)

https://github.com/gotm-model/code/issues

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Karsten Bolding

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[Mattias Cape]

Hi Jorn and Karsten,

Thank you for your quick feedback and ideas. I'll take a look at the scripts you mention. My Fortran skills are on the upswing, we'll see how far they take me :)

I'll follow up on this conversation on Github as you suggest - we are moving that direction in our research group as well, a good reminder.

Cheers,

Mattias

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