Uncertainties in future marine N2O emissions in the eastern tropical Pacific

Marine emissions of nitrous oxide (N₂O) supply ~10-30% of the annual N2O flux to the atmosphere, affecting both climate and stratospheric ozone. Low oxygen regions of the eastern tropical Pacific (ETP) supply much of open ocean N₂O. However, due to this region's sensitivity to future climate change, future N₂O emissions from the ETP are highly uncertain, although previous short-term responses to ENSO events indicate that N₂O is sensitive to changes in oxygen. Here, we use global biogeochemistry-circulation models to assess uncertainties in projected current and future N₂O emissions from the ETP to the atmosphere. Our work includes a comparison between previous model descriptions of marine N₂O and a newly developed data based parameterization of N₂O production and consumption.