Fig. 5: A schematic of an inverse 1-D model and modeled nitrogen cycling rates.
From: Microbial niche differentiation explains nitrite oxidation in marine oxygen minimum zones

a, b A schematic of physical processes and net biochemical production or consumption (R) that affect concentrations of inorganic nitrogen compounds (a), and nitrogen cycle processes resulting in net production or consumption (R) in the anoxic core of the ODZ represented in the model (b). Black arrows: nitrate reduction and denitrification (nitrite reduction to N2). Red arrows: anammox. Blue arrows: nitrite oxidation through disproportionation. c–j Model results: (c, g) Modeled rates of nitrate reduction; (d, h) Nitrate production from nitrite disproportionation; (e, i) Denitrification (black), anammox (red), N2 production from nitrite disproportionation (blue); (f, j) Total N2 production when including nitrite oxidation through disproportionation (blue) and excluding nitrite oxidation in the model (black) at stations BB1 (c–f) and BB2 (g–j) in the ETSP OMZ. Shaded areas indicate the location of the anoxic ODZ.