Basic to the understanding of ocean chemistry, is the chemical composition of the organic tissue manufactured by marine organisms. The key elemental ingredients are C, H, N and P. It is the ratio of these ingredients that sets the oxygen demand connected with their consumption by predators and bacteria in the deep sea. Although a very minor contributor to the O2 demand, phosphorus is important because it is the limiting nutrient. Hydrogen is, of course super abundant because it is easily available in H2O. The carbon in ΣCO2 (CO2, HCO3 and CO...

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