Fig. 4: Relationship between dissolved inorganic carbon (DIC) versus nutrients and other carbonate chemistry parameters. | Nature Communications

Fig. 4: Relationship between dissolved inorganic carbon (DIC) versus nutrients and other carbonate chemistry parameters.

From: A source of isotopically light organic carbon in a low-pH anoxic marine zone

Fig. 4

(a) PO43−, (b) inorganic nitrogen (NO2 + NO3), (c) N*, (d) total pH (pHT), and (e) total alkalinity (AT), within the range from surface to 1000 m water depth during 2015 and 2018 expeditions. Filled symbols correspond to data points associated with O2 concentrations < 20 μmol kg−1. The correlations observed in low oxygen waters (filled points) for DIC versus nitrogen at 2015 is given and indicated by the dark blue line (b). Labels in (b) were included to emphasize the processes highlighted in the stoichiometric analysis (e.g. Annamox, sulfur-driven autotrophic denitrification (SDAD), and denitrification).

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