Hi, ROMS users
I met some problems handling with RadNud boudary. In ocean.in, TNUDG and M3NUDG mean outflow nudging time scales, I am not sure that what is exact meaning of the 'time scale'.
In my current understanding, inflow time scale is decided by given boundary conditon and outflow conditon is decided by the physical process simulated by ROMS.
For example, as for a simple case : a ideal hurricane passing over the open ocean.
The outflow timescale is decided by the hurricane process (hurricane event has strong outflow and short time scale, maybe one day ), thus TNUDG and M3NUDG =1 day
The inflow timescale is decided by boundary condition (I input hourly u,v, zeta.....boundary) , thus inflow timescale = 1 hour = 1/24 day, thus OBCFAC=24.
When it comes to another case: annual variation of SST, TNUDG and M3NUDG= 365 day and OBCFAC=12 (monthly )or 365 (daily)
I don't know if my understanding is correct.
Thanks in advance
17/06/2020