Fig. 7: N2 fixation rates in different types of sinking particles with different sinking speeds.
From: Quantifying nitrogen fixation by heterotrophic bacteria in sinking marine particles
a Particle radius (cm) versus sinking speeds (m d−1) of natural marine snow (continuous line) measured in situ off California (\(v=108.95\times {r}_{{\rm{P}}}\)0.26;61) and of laboratory-made diatom (dashed line) and coccolithophore (dotted line) aggregates measured in vitro (\(v=484.09\times {r}_{{\rm{P}}}\)0.72 and \(v=719.44\times {r}_{{\rm{P}}}\)0.47, respectively50). b \({{\rm{O}}}_{2}\) and \({{{\rm{NO}}}_{3}}^{-}\) profiles of the Mauritanian upwelling zone in the North Atlantic Ocean (NAO)55. c–e \({{\rm{N}}}_{2}\) fixation rates per unit volume of particles of different sizes and types. White and magenta dashed lines are same as in Fig. 6. The area enclosed within the horizontal green lines represents the low-\({{\rm{O}}}_{2}\) zone.
