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The authors present the determination method of nutrient’s background concentration in the seawater. In this work, as a basis for the proposed method, we use a three-component system [1-6, 10, 11, 12, 13] for mixing water masses in the Barents Sea based on the parameter δ18О. Simple mixing of purely Atlantic water masses and purely river water masses, as well as ice formation and melting processes, were taken into account. The authors suppose that the background concentration is a concentration that changes only as a result of water transformation, such as melting and freezing. The authors consider background concentration of phosphates, nitrates and silicates for the Barents Sea calculated from previously collected data. The difference between measured and background concentrations indicates the production or destruction process of organic matters. If the results are positive - there is destruction; if negative, there is - production. The data for δ18О, salinity, phosphates, nitrates, and silicates that were used in this study were taken from an open-source database published on the NASA website and in our own collection. Samples were taken in the summer.

Applying the δ18O Parameter for Evaluating of Organic Matter Production-destruction Processes in the Barents Sea