I am a little confused about nudging. I am sure this subject has already been discussed in the forum but I just can’t find a post that addresses the parameters that control lateral nudging and the ones that control nudging to climatology.
I am using ROMS version 839, which I have updated on 2017-03-04. In this version we can choose to use or not the lateral nudging by setting the Logical switches (T/F) to turn on/off lateral nudging.
Well, I am choosing to use the nudging on M3 and T.
LnudgeM2CLM == F
LnudgeM3CLM == T
LnudgeTCLM == T T
and then, there is the nudging to climatology, which we choose to use or not by setting the appropriate
Logical switches (TRUE/FALSE) and I have decided to use this nudging on m3 and tracers:
LsshCLM == F
Lm2CLM == F
Lm3CLM == T
LtracerCLM == T T
Now comes the questions:
Which nudging, lateral or climatological, uses the values that I set for TNUDG, ZNUDG, M2NUDG, M3NUDG and OBCFAC ?
I am assuming that, if I don’t use the nudging to climatology (use F for LsshCLM, Lm2CLM, Lm3CLM and LtracerCLM) the open boundary conditions will use the values that I set for TNUDG, ZNUDG, M2NUDG and M3NUDG + OBCFAC, considering the logical switches LnudgeM2CLM, LnudgeM3CLM and LnudgeTCLM, to compute the ‘in’ and ‘out’ values obc-in and obc-out in subroutine t3dbc_im.f90
However, If I choose to use the nudging to climatology, these parameters (TNUDG, ZNUDG, M2NUDG and M3NUDG), WILL NOT be used. Instead, the code will use the values that I set for M2_NudgeCoef, M3_NudgeCoef, temp_NudgeCoef and salt_NudgeCoef in a netcdf file that I will prepare, or will use the values that are set by the code if I use ANA_NUDGCOEF in my *.h file.
Am I correct to assume that ?
If anyone has comments that will enlight my doubts, they will be wellcome
.Thanks in advance.
Ivan
