Problems with 'tracer' module

[Gabriela Sales]

Hello everybody!

I'm having trouble using the 'tracer' module of GLM-AED  (GLM version 3.1.8.).

My intention is to implement 2 tracers (simulation from 2017-08-01 to 2019-02-28):

tracer 1: concentration = 1 kg/m³; decay rate = 0.01 /d; start = 2018-02-01

tracer 2: concentration = 1 kg/m³; decay rate = 0 /d; start = 2017-08-01

So I configured the 'tracer' module as:

    retention_time = .true.

     num_tracers = 2

     decay = 0.01, 0

    settling = 0

    resuspension = 0

But the results I got (below) are strange. The concentration of the first tracer is not changed, whereas the second is.

Could someone help me understand what I'm doing wrong, please?

In addition, I would like to confirm if the tracer concentration unit required in the model is mg / L, as it is on the AED library website, because I have seen in some other material that is mmol / m³.

Thanks a lot in advance!

Best regards,

Gabriela