Identifying the Sources and Drivers of Nitrous Oxide Accumulation in the Eddy‐Influenced Eastern Tropical North Pacific Oxygen‐Deficient Zone

Nitrous oxide (N2O) is a powerful greenhouse gas, and oceanic sources account for up to one third of the total natural flux to the atmosphere. In oxygen‐deficient zones (ODZs) like the Eastern Tropical North Pacific (ETNP), N2O can be produced and consumed by several biological processes. In this st...

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Bibliographic Details
Published in:Global biogeochemical cycles 2022-06, Vol.36 (6), p.n/a
Main Authors: Monreal, Patrick J., Kelly, Colette L., Travis, Nicole M., Casciotti, Karen L.
Format: Article
Language:English
Subjects:
Ammonia
and modeling
Anoxia
anoxic environments
Archaea
Atmospheric models
biogeochemical cycles
Biological activity
Carbon dioxide
Climate change
Consumption
Cycles
Denitrification
Eddies
eddies and mesoscale processes
Emission measurements
Emissions
Future climates
Greenhouse gases
Isopycnals
Isotopes
Mesoscale phenomena
Nitrification
nitrogen cycling
Nitrous oxide
Ocean circulation
Ocean currents
Oceans
Oxidation
Oxygen
processes
stable isotopes
Swirling
Tropical climate
Vortices
Water analysis
Water sampling
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Summary:Nitrous oxide (N2O) is a powerful greenhouse gas, and oceanic sources account for up to one third of the total natural flux to the atmosphere. In oxygen‐deficient zones (ODZs) like the Eastern Tropical North Pacific (ETNP), N2O can be produced and consumed by several biological processes. In this study, the concentration and isotopocule ratios of N2O from a 2016 cruise in the ETNP were analyzed to examine sources of and controls on N2O cycling across this region. Along the north‐south transect, three distinct biogeochemical regimes were identified: background, core‐ODZ, and high‐N2O stations. Background stations were characterized by smaller variations in N2O concentration and isotopic profiles relative to the other regimes. Core‐ODZ stations were characterized by co‐occurring N2O production and consumption at anoxic depths, indicated by high δ18O‐N2O (>90‰) and low δ15N2Oβ (
ISSN:0886-6236
1944-9224
DOI:10.1029/2022GB007310