It appears to me that the flag ZCLM_NUDGING is missing from ROMS/Include/cppdefs.h, yet it still seems to have an active role to play in parts of the code, e.g. ana_nudgcoef.h and mod_clima.F (I am using version number 629 of the code). Any thoughts?
Parker
ZCLM_NUDGING
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arango
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Re: ZCLM_NUDGING
Yes, this is on purpose 
It is not a good idea to nudge free-surface in ROMS or any other model. I have mentioned this few time in this forum. The free-surface is an expression for the vertically integrated continuity equation. That is, the time rate of change of free-surface is due to the horizontal divergence of (ubar,vbar). There is not a primitive equation for free-surface. If you want nudging of this type, you need to do it in the prognostic, vertically-integrated equations for momentum (M2CLM_NUDGING). We should not mess around with such an important mass/volume conservation.
It is not a good idea to nudge free-surface in ROMS or any other model. I have mentioned this few time in this forum. The free-surface is an expression for the vertically integrated continuity equation. That is, the time rate of change of free-surface is due to the horizontal divergence of (ubar,vbar). There is not a primitive equation for free-surface. If you want nudging of this type, you need to do it in the prognostic, vertically-integrated equations for momentum (M2CLM_NUDGING). We should not mess around with such an important mass/volume conservation.