  A general model for stationary, time-wise turbulent velocity is presented and
discussed. This approach, inspired by modeling ideas of Barndorff-Nielsen and
Schimgel, is coherent with the K41 hypothesis of local isotropy, and it allows
us to separate second-order statistics from higher order ones. The model can be
motivated by Taylor's hypothesis and a relation between time and spatial
spectra. Second order statistics are used to separate the deterministic kernel
function and the weakly stationary driving noise. A non-parametric estimation
method for the turbulence intermittency is suggested.
