I am pleased to advise that based on your 3 positive formal reviews and your careful attention to the minor points they raised, your revised submission is now acceptable for publication. Please include the following minor corrections in preparing your final version for Biogeosciences.

Line 4: correct the formatting of author affiliation for A. Gueneugues.
L38, L153, L203, L414 and throughout the manuscript: always capitilize Polar Front
L48: replace “consequences on climate” by “consequences for climate”
L63: to meet reviewer #1 request for additional citations, add citation of Sarmiento and Orr (1991).
Sarmiento, J. L., and Orr, J. C.: Three-dimensional simulations of the impact of Southern Ocean nutrient depletion on atmospheric CO2 and ocean chemistry, Limnology and Oceanography, 36, 1928-1950, 1991.

L80 replace “.., and we also discuss the stoichiometry of both nutrients.” by “ .., and discuss their stoichiometry.”
L97 provide the pore size and cite a manufacturer for the Up-tidisc filter.
L 108 define the meaning of “ultrapure water”, e.g. “ultrapure water (prepared by deionization and UV sterilization)”.
L116 replace “The precisions was...” by “The precisions were...”
L120 replace “during 30 min” by “for 30 minutes”
L127 add the clause “...(Jabsco), following the method of Holmes et al. (1999).
L151 and L271 and throughout the manuscript, replace “subantarctic” by “Subantarctic”
L179 replace “similar than in..” by “similar to those...”
L183 replace “detail in the section...” by “detail in section...”
L227 replace “provide” by “provided”
L229 and L231 replace ‘are” by “were”
L232 replace ‘cluster’ by ‘clustered’
L238 replace ‘present’ by ‘presented’
L263 replace ‘have’ by ‘had’
L267 and L273 replace ‘distribution’ by ‘distributions’
L291 replace ‘contributed to 70%’ by contributed 70%’
L293 replace ‘was’ by ‘has been’
L299 replace ‘diatoms of the’ by diatoms in the’
L231 replace ‘(Landolfi et al., 2008)’ by ‘Landolfi et al., (2008)’
L325 replace ‘could reach’ by ‘reached’
L322 and throughout the manuscript: consider replacing TNxs by TN* to make the link with N* for clearly.
L327 and L328, replace or define or otherwise make clear the meanings of the formulas which appear here for the first time; TDN=f(TDP) and NO3=f(PO4)
L329 replace ‘TNxs were’ by ‘TNxs values were’
L334 replace ‘non-redfieldien’ by ‘non-Redfieldien’ or ‘non-Redfield’
L357 replace ‘in a ratio’ by ‘with a N/P ratio’
L33 replace ‘features’ by ‘observations’
L371 add citation to ocean color images as ‘...ocean color images available (see supplementary animations provided in Trull et al., 2014)’
L398 consider adding a sentence to this paragraph: ‘Additional evidence for intensive remineralization at shallow depths at this location is provided by strong attenuation of particle fluxes as observed with sediment traps (Rambouville et al. 2014).’
L411 replace ‘color dots’ by ‘colored dots’
L420, L425, L429 and L450 specify ‘sigma’ as either ‘sigma-theta’ or ‘sigma-t’, whichever is correct.
L444 replace ‘, Dots..’ by ‘, dots..’

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Thank you for your careful attention to the final details.
Your paper is now acceptable for publication.