Hydrological and hydrochemical studies in the central and Southern Caspian Sea aboard the R/V Issledovatel’ Kaspiya (September 6–24, 2005)

The ratio of dissolved fixed inorganic nitrogen to soluble inorganic phosphate (N:P) in the ocean interior is relatively constant, averaging approximately 16 : 1 by atoms. In contrast, the ratio of these two elements spans more than six orders of magnitude in lakes and other aquatic environments. To understand the factors influencing N:P ratios in aquatic environments, we analyzed 111 observational datasets derived from 35 water bodies, ranging from small lakes to ocean basins. Our results reveal that N:P ratios are highly correlated with the concentration of dissolved O(2) below approximately 100 micromol L(-1). At higher concentrations of O(2), N:P ratios are highly variable and not correlated with O(2); however, the coefficient of variation in N:P ratios is strongly related to the size of the water body. Hence, classical Redfield ratios observed in the ocean are anomalous; this specific elemental stoichiometry emerges not only as a consequence of the elemental ratio of the sinking flux of organic matter, but also as a result of the size of the basins and their ventilation. We propose that the link between N:P ratios, basin size and oxygen levels, along with the previously determined relationship between sedimentary delta(15)N and oxygen, can be used to infer historical N:P ratios for any water body.

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Hydrological and hydrochemical studies in the central and Southern Caspian Sea aboard the R/V Issledovatel’ Kaspiya (September 6–24, 2005)

Cited by 3 publications

References 0 publications

Variations of dissolved oxygen concentrations under influence of seasonal stratification using deep-water observations in the southern region of the Caspian Sea

Variations of dissolved oxygen concentrations under influence of seasonal stratification using deep-water observations in the southern region of the Caspian Sea

Hydrochemistry and nutrient distribution in southern deep-water basin of the Caspian Sea

Redox control of N:P ratios in aquatic ecosystems

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