hi,
I found that the defaut set of iocnrough is 1 in RegCM v4.3. Actually this formula is not used in RegCM v3.
Instead the formula in RegCM3 is, the roughness length of momentum: zo= (0.013*ustar*ustar)/egrav+0.11*visa/ustar , following Smith(1988).
! iocnrough: Zeng Ocean Model Roughness model
! = 1 ; (0.0065*ustar*ustar)/egrav (the RegCM V3 one)
! = 2 ; (0.013*ustar*ustar)/egrav+0.11*visa/ustar (the Zeng one)
I wonder why this default set is changed to "(0.0065*ustar*ustar)/egrav". Is there a reference for this specific equation?
Thank you very much!
Zhenyu HAN