N2O production and consumption from stable isotopic and concentration data in the Peruvian coastal upwelling system: N2O Production and Consumption off Peru

Bourbonnais, Annie; Letscher, Robert T.; Bange, Hermann W.; Échevin, Vincent; Larkum, Jennifer; Mohn, Joachim; Yoshida, Naohiro; Altabet, Mark A.

doi:10.1002/2016gb005567

Title: N₂O production and consumption from stable isotopic and concentration data in the Peruvian coastal upwelling system: N₂O Production and Consumption off Peru

Journal Article · Tue Mar 07 00:00:00 EST 2017 · Global Biogeochemical Cycles

DOI:https://doi.org/10.1002/2016gb005567· OSTI ID:1532974

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^[4]; Larkum, Jennifer ^[1];

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^[6]; Altabet, Mark A. ^[1]

Univ. of Massachusetts, Dartmouth, MA (United States)
Univ. of California, Irvine, CA (United States)
Helmholtz Centre for Ocean Research Kiel, (Germany). GEOMAR
Lab. d'Océanographie et de Climatologie, Paris (France)
Empa, Dübendorf (Switzerland). Lab. for Air Pollution and Environmental Technology
Tokyo Inst. of Technology (Japan); Tokyo Inst. of Technology, Yokohama (Japan)

The ocean is an important source of nitrous oxide (N₂O) to the atmosphere, yet the factors controlling N₂O production and consumption in oceanic environments are still not understood nor constrained. We measured N₂O concentrations and isotopomer ratios, as well as O₂, nutrient and biogenic N₂ concentrations, and the isotopic compositions of nitrate and nitrite at several coastal stations during two cruises off the Peru coast (~5–16°S, 75–81°W) in December 2012 and January 2013. N₂O concentrations varied from below equilibrium values in the oxygen deficient zone (ODZ) to up to 190nmol L^-1 in surface waters. We used a 3-D-reaction-advection-diffusion model to evaluate the rates and modes of N₂O production in oxic waters and rates of N₂O consumption versus production by denitrification in the ODZ. Intramolecular site preference in N₂O isotopomer was relatively low in surface waters (generally -3 to 14‰) and together with modeling results, confirmed the dominance of nitrifier-denitrification or incomplete denitrifier-denitrification, corresponding to an efflux of up to 0.6 Tg N yr^-1 off the Peru coast. Other evidence, e.g., the absence of a relationship between ΔN₂O and apparent O₂ utilization and significant relationships between nitrate, a substrate during denitrification, and N₂O isotopes, suggest that N₂O production by incomplete denitrification or nitrifier-denitrification decoupled from aerobic organic matter remineralization are likely pathways for extreme N₂O accumulation in newly upwelled surface waters. We observed imbalances between N₂O production and consumption in the ODZ, with the modeled proportion of N₂O consumption relative to production generally increasing with biogenic N₂. However, N₂O production appeared to occur even where there was high N loss at the shallowest stations.

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Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0016329

OSTI ID:: 1532974

Journal Information:: Global Biogeochemical Cycles, Vol. 31, Issue 4; ISSN 0886-6236

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 41 works

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Investigating the effect of El Niño on nitrous oxide distribution in the eastern tropical South Pacific Ji, Qixing; Altabet, Mark A.; Bange, Hermann W. Biogeosciences, Vol. 16, Issue 9 https://doi.org/10.5194/bg-16-2079-2019	journal	January 2019
Global reconstruction of surface oceanic N2O disequilibrium and its associated flux Bianchi, Daniele; Yang, Simon Biological and Chemical Oceanography Data Management Office (BCO-DMO) https://doi.org/10.26008/1912/bco-dmo.810032.1	dataset	January 2020
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Processes and Microorganisms Involved in the Marine Nitrogen Cycle: Knowledge and Gaps Pajares, Silvia; Ramos, Ramiro Frontiers in Marine Science, Vol. 6 https://doi.org/10.3389/fmars.2019.00739	journal	November 2019
Distribution of Concentration and Stable Isotopic Composition of N ₂ O in the Shelf and Slope of the Northern South China Sea: Implications for Production and Emission Zhang, Gui‐Ling; Liu, Su‐Mei; Casciotti, Karen L. Journal of Geophysical Research: Oceans, Vol. 124, Issue 8 https://doi.org/10.1029/2019jc014947	journal	August 2019

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