Surface Nitrification: A Major Uncertainty in Marine N2O Emissions

摘要: The ocean is responsible for up to a third of total global nitrous oxide (N2O) emissions, but uncertainties in emission rates this potent greenhouse gas are high (>100%). Here we use marine biogeochemical model assess six major estimates N2O production, thereby providing guidance how future studies may most effectively reduce current and emissions. Potential surface production from nitrification causes the largest uncertainty emissions (estimated ~1.6 Tg N yr-1, or 48% modeled values), followed by unknown oxygen concentration at which switches consumption (0.8 24% values). Other minor, cumulatively changing regional <15%. If could be ruled out studies, would halved.