Fig. 6: Dynamics inside sinking particles of different sizes in the upper 500 m of the Mauritanian upwelling zone in the North Atlantic Ocean (NAO)55.
From: Quantifying nitrogen fixation by heterotrophic bacteria in sinking marine particles
\({{\rm{O}}}_{2}\) and \({{{\rm{NO}}}_{3}}^{-}\) profile in the water column55 (a), total amount of fixed \({{\rm{N}}}_{2}\) per particle (b), fraction of particle volume where respiration is fueled by denitrification (c), and fraction of particle volume where respiration is fueled by \({{{\rm{SO}}}_{4}}^{2-}\) reduction (d). Areas enclosed by white and magenta dashed lines represent the occurrence of \({{\rm{N}}}_{2}\) fixation (>\({10}^{-3}\) μg N day−1 particle−1) and anoxia (\({{\rm{O}}}_{2}\)<\({10}^{-3}\) μmol O2 L−1), respectively, at the center of particles.
