[MITgcm-support] A question about gchem pkg

[Martin Losch]

Hi there,

I don’t know either how to set that, but you could try this in your build directory:

grep -i gchem_Tracer_num *.[h,F]

this will give a list of places, where this variable is defined and used. When I do this, I find that in gchem_tr_register.F, different subroutines specific to specificy biogeochemical packages are call, each of which sets the variable according to what they require. I.e. you probably cannot just reduce PTRACERS_numInUse for a given model.

I am sorry to say this, but sometimes minimal unix skill will help you solve your issues. In the context of the MITgcm the command “grep” is your friend. It has helped me big time in debugging MITgcm issues.

Martin

> On 16. Jul 2021, at 08:25, Haoran Xu <xu1jian2wei3 at 163.com> wrote:
> 
> Hope you all going well!
> I am using the gchem pkg. One error occurs when i change the number of the ptracer to 4.It shows as following:
> 
> (PID.TID 0062.0001) *** ERROR *** GCHEM_CHECK: Number of GCHEM tracers: gchem_Tracer_num =    5
> (PID.TID 0062.0001) *** ERROR *** GCHEM_CHECK:  exceeds number of pTr: PTRACERS_numInUse =    4
> (PID.TID 0062.0001) *** ERROR *** GCEHM_CHECK: detected  1 fatal error(s)
> (PID.TID 0062.0001) *** ERROR *** S/R ALL_PROC_DIE: ending the run
> 
>  I donont know how to change the parameter  gchem_Tracer_num.
>  Is there any idea?
> 
> 
>  
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