Based on an impressive data set on turbulence data, the paper adresses the mixing processes which can explain a crucial point in favouring N2 fixation in the Western Tropical Pacific Ocean : phosphorus is needed to sustain primary production through N2 fixation, in a region where nitrogen is missing. The contrast between the westen region of the Equatorial Pacific and the oligotrophic region, east of 170°W, in terms of dissipation and vertical turbulent mixing is shown and the potential different sources of turbulence are discussed (shear, wind, tide). The interplay between the intensity of vertical mixing, along vwith its vertical distribution, the depth of the nutriclines (N and P), and of the euphotic layer, shows how the resulting different nutrient fluxes can support the zonal gradient of N2 fixation. Discussions about intermittency of mixing open future work on this very important issue for biogeochemsitry and mcirobial ecology.
The new version of the paper takes into account all the reviewers' comments, with a clear persentation of the methodology, a complete discussion and relevant, well illustrated figures.

A regret : iron measurements could have been used to estimate the vertical fluxes of iron as well, although the vertical resolution of the Fe observations might be coarser than for P and N. Iron is also required for N2 fixation. Even if the results depend only on the vertical Fe profiles, and not on the mixing variability, some words could have been interesting on that issue.

p.8 line 25 : what is the number of the figure ?
p.12 line 26 : 'top fo the' ==> top of the
figure 11 : 'The top of the nitracile is not defined by' ==> 'not' should be removed ?

Even though there is a reference for the definition of the nutracline (Caffin et al., 2018), considering the importance of this parameter in the discussion, its definition should be presented in this paper, in order to make it more self-sufficient.

The last light modifications have been considered.