[MITgcm-support] Stress (?) term in vector-invariant momentum equations

[Roland Young]

Hi,

What does the 5th term ($G_u^{\partial_z\tau^x}$) on the right hand side of the vector invariant $G_u$ momentum equation refer to? (Equation 2.122 at http://mitgcm.readthedocs.io/en/latest/algorithm/algorithm.html#vector-invariant-momentum-equations, and similarly in equations 2.123 and 2.124 in the other two directions.)

I cannot find any details about how it is computed in the section 2.15 subsections. 

Thanks,

Roland