@article{fdi:010070054,
  title = {{N}2{O} production and consumption from stable isotopic and concentration data in the {P}eruvian coastal upwelling system},
  author = {{B}ourbonnais, {A}. and {L}etscher, {R}. {T}. and {B}ange, {H}. {W}. and {E}chevin, {V}incent and {L}arkum, {J}. and {M}ohn, {J}. and {Y}oshida, {N}. and {A}ltabet, {M}. {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he ocean is an important source of nitrous oxide ({N}2{O}) to the atmosphere, yet the factors controlling {N}2{O} production and consumption in oceanic environments are still not understood nor constrained. {W}e measured {N}2{O} concentrations and isotopomer ratios, as well as {O}-2, nutrient and biogenic {N}-2 concentrations, and the isotopic compositions of nitrate and nitrite at several coastal stations during two cruises off the {P}eru coast (similar to 5-16 degrees {S}, 75-81 degrees {W}) in {D}ecember 2012 and {J}anuary 2013. {N}2{O} concentrations varied from below equilibrium values in the oxygen deficient zone ({ODZ}) to up to 190 nmol {L}-1 in surface waters. {W}e used a 3-{D}-reaction-advection-diffusion model to evaluate the rates and modes of {N}2{O} production in oxic waters and rates of {N}2{O} consumption versus production by denitrification in the {ODZ}. {I}ntramolecular site preference in {N}2{O} isotopomer was relatively low in surface waters (generally -3 to 14 parts per thousand) and together with modeling results, confirmed the dominance of nitrifier-denitrification or incomplete denitrifier-denitrification, corresponding to an efflux of up to 0.6 {T}g {N} yr(-1) off the {P}eru coast. {O}ther evidence, e.g., the absence of a relationship between {D}elta {N}2{O} and apparent {O}-2 utilization and significant relationships between nitrate, a substrate during denitrification, and {N}2{O} isotopes, suggest that {N}2{O} production by incomplete denitrification or nitrifier-denitrification decoupled from aerobic organic matter remineralization are likely pathways for extreme {N}2{O} accumulation in newly upwelled surface waters. {W}e observed imbalances between {N}2{O} production and consumption in the {ODZ}, with the modeled proportion of {N}2{O} consumption relative to production generally increasing with biogenic {N}-2. {H}owever, {N}2{O} production appeared to occur even where there was high {N} loss at the shallowest stations.},
  keywords = {{PEROU} ; {PACIFIQUE}},
  booktitle = {},
  journal = {{G}lobal {B}iogeochemical {C}ycles},
  volume = {31},
  numero = {4},
  pages = {678--698},
  ISSN = {0886-6236},
  year = {2017},
  DOI = {10.1002/2016gb005567},
  URL = {https://www.documentation.ird.fr/hor/fdi:010070054},
}