[MITgcm-support] Time-Varying Ptracer Concentration

[Jean-Michel Campin]

Hi Weiyang,

May I suggest to take a look in verification/tutorial_global_oce_latlon/code
where the 2 ptracers forcing subroutines have been modified to simulate
a surface age tracer: concentration relaxed to zero at the surface but increasing
with time (source term equal to unity) everywhere else.

This is not exactly what you are looking for but could be a good starting point
to get the correct modified code for your second tracer.

Cheers,
Jean-Michel

On Thu, May 13, 2021 at 08:39:06PM -0400, Weiyang Bao wrote:
> Dear MITgcm users,
> 
> I???m trying to introduce two passive tracers at a selected region of my coastal model domain. In order to estimate the ???age??? (time elapsed) of the tracer since it was introduced, one of the tracers need to have a steady input with a concentration say 1, the other tracer should have a concentration that grows at a known rate, say 1, 2, 3,??? at time 1, 2, 3,??? and the ratio of these two tracers can be used to estimate. I???ve figured out using the RBCS package to relax the first tracer and maintain a continuous concentration of unity, but not sure how to generate the time-varying (or linearly increasing) concentration for the second tracer. It will be much appreciated if you could share some ideas.
> 
> Thanks for your time,
> 
> Weiyang
> 
> Weiyang Bao
> Ph.D. Candidate, Physical Ocean Science and Engineering
> School of Marine Science and Policy
> University of Delaware
> wbao at udel.edu

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