Carbon and nitrogen uptake and export in the equatorial Pacific at 150°W: Evidence of an efficient regenerated production cycle

@article{Raimbault1999CarbonAN,
  title={Carbon and nitrogen uptake and export in the equatorial Pacific at 150°W: Evidence of an efficient regenerated production cycle},
  author={Patrick Raimbault and Gerd Slawyk and Benyahia Boudjellal and Christine Coatanoan and Pascal Conan and Bernard Coste and Nicole Garcia and Thierry Moutin and Mireille Pujo-Pay},
  journal={Journal of Geophysical Research},
  year={1999},
  volume={104},
  pages={3341-3356}
}
Biomass, inorganic carbon and nitrogen uptake, ammonium regeneration, nitrification, and vertical flux of particulate matter were measured in the equatorial Pacific at 21 daily productivity stations occupied on a meridional transect (150oW) between ioN and 16oS. Three areas could be distinguished along the transect: (1) the equatorial area between IoN and 6oS, where nitrate concentrations were typically eutrophic, reaching up to 3/g-at L - in surface waters; (2) an intermediate mesotrophic… 

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References

SHOWING 1-10 OF 82 REFERENCES

Measurements of nitrogen productivity in the equatorial Pacific

During the R/V Wecoma WEC88 cruise that sampled a meridional transect along 150°W from 15°N to 15°S, uptake of nitrate and ammonium by phytoplankton was measured using the stable isotope 15N with

UPTAKE OF NEW AND REGENERATED FORMS OF NITROGEN IN PRIMARY PRODUCTIVITY1

The use of 15N-labeled compounds to obtain specific uptake rates for the various nitrogen sources available to the phytoplankton makes it possible to separate the fractions of primary productivity

Silicate regulation of new production in the equatorial Pacific upwelling

Surface waters of the eastern equatorial Pacific Ocean present the enigma of apparently high plant-nutrient concentrations but low phytoplankton biomass and productivity. One explanation for this

Standing stocks of particulate carbon and nitrogen in the equatorial Pacific at 150°W

In March 1988 a north-south transect at longitude 150°W was carried out in the equatorial Pacific between latitude 15°N and 15°S. Observations of suspended particulate matter in the euphotic zone
...