Passive tracer with sea-to-air flux

Hi everyone,

I have observations with SF5CF3 as tracers and I want to do a simulation. I currently define it as a passive tracer and the model outputs show that the tracer is mostly concentrated at the sea surface. But SF5CF3 will be released into the atmosphere rather than accumulating at the surface in real oceans. I would like to add a tracer flux at the surface so that the tracer can be released into the atmosphere, but I don’t know how to do it. Can anybody help me in this issue?

Thank you!