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Nitrite (NO2-) is a key intermediate in the marine nitrogen (N) cycleand a substrate in nitrification, which produces nitrate (NO3-),as well as water column N loss processes denitrification and anammox. Inmodels of the marine N cycle, NO2- is often not considered as aseparate state variable, since NO3- occurs in much higherconcentrations in the ocean. In oxygen deficient zones (ODZs), however,NO2- represents a substantial fraction of the bioavailable N,and modeling its production and consumption is important to understand the Ncycle processes occurring there, especially those where bioavailable N islost from or retained within the water column. Improving N cycle models byincluding NO2- is important in order to better quantify Ncycling rates in ODZs, particularly N loss rates. Here we present theexpansion of a global 3-D inverse N cycle model to include NO2-as a reactive intermediate as well as the processes that produce and consumeNO2- in marine ODZs. NO2- accumulation in ODZs isaccurately represented by the model involving NO3- reduction,NO2- reduction, NO2- oxidation, and anammox. Wemodel both 14N and 15N and use a compilation ofoceanographic measurements of NO3- and NO2-concentrations and isotopes to place a better constraint on the N cycleprocesses occurring. The model is optimized using a range of isotope effectsfor denitrification and NO2- oxidation, and we find that thelarger (more negative) inverse isotope effects for NO2-oxidation, along with relatively high rates of NO2-, oxidationgive a better simulation of NO3- and NO2-concentrations and isotopes in marine ODZs.

Modeling oceanic nitrate and nitrite concentrations and isotopes using a 3-D inverse N cycle model