[MITgcm-support] BLING with variable atmospheric pCO2

[Matthew Mazloff]

Hi Dave

It is implemented as long as you are using EXF 

In data.bling you just give the info the exf package needs. For example:
 apco2file         = 'atm_pco2_capegrim_SO12',
 apco2period         = 2635200,
 apco2_interpMethod = 0,

Then in bling_fields_load it will fill it:
C Get Atmospheric carbon dioxide concentration from PKG/EXF
#ifdef ALLOW_EXF
C     Atmospheric carbon dioxide concentration
      IF ( useEXF ) THEN
       IF ( apco2file .NE. ' '  ) THEN
        CALL EXF_SET_FLD(
     I     'apco2', apco2file, apco2mask,
…


-Matt


> On Mar 21, 2023, at 5:18 AM, Dave Munday - BAS <danday at bas.ac.uk> wrote:
> 
> Hi all,
> 
> I’ve been setting up an idealised model with the intention to use BLING to look at carbon cycling. From looking at the code, I don’t think BLING has an option to have the atmospheric pCO2 dynamically evolve with the ocean carbon storage, like the DIC package does. I could impose a changing pCO2 via input from EXF, but I want to try and conserve the total atmosphere+ocean carbon inventory.
> 
> Has anyone coded up this option for BLING? Or got some advice on where to start? I’ve been comparing with DIC and it looks like I need to port the calculations in dic_atmos.F across to BLING and then call if from somewhere appropriate. I think this might be in gchem_forcing_sep.F, solely because DIC calls DIC_ATMOS there.
> 
> Many thanks,
> 
> Dave
> 
> 
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