Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 46576 10.2205/2021ES000758 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Leaching of inorganic carbon and nutrients from rocks of the Arctic archipelagos (Novaya Zemlya and Svalbard) Leaching of inorganic carbon and nutrients from rocks of the Arctic archipelagos (Novaya Zemlya and Svalbard) Polukhin Alexander Polukhin Alexander polukhin@ocean.ru Makkaveev Petr Makkaveev Petr Miroshnikov Alexey Miroshnikov Alexey Borisenko Gennadii Borisenko Gennadii Khlebopashev Pavel Khlebopashev Pavel Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry RAS ru Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry RAS ru Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry RAS ru Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry RAS ru Shirshov Institute of Oceanology RAS ru Shirshov Institute of Oceanology RAS ru 21 4 29 10 2021 https://rjes.ru/en/nauka/article/46576/view

Over the Arctic Ocean, the concentration of nutrients is limiting the development of phy- toplankton, and hence the whole ecosystem. The main source of nutrients in the Arctic is river runoff and remineralization. However, there are local features of the functioning of coastal ecosystems, they are associated with the supply of nutrients from the glacier streams. Experiments with samples of rocks (represented by dolomitic shales and limestone) have been conducted to test the hypothesis that the main source of nutrients for coastal ecosystems are the rocks forming the bedrock of glacier streams. Exposure of rock samples in distilled water was held from 5 to 14 days and the content of nutrients has increased. As a result of labora- tory experiments, the leaching rates were obtained. The rates are 0.021-0.15 mmol/m2 day and 0.1-2.5 mmol/m2 day for total nitrogen and total inorganic carbon, respectively. The concentration of nutrients (0.3-33 µM of nitrogen, 214-1928 µM of total inorganic carbon) in glacial streams confirms this assumption. Field and experimental data show that the glacial runoff from the Arctic archipelagos contains a significant amount of nutrients that can directly affect the activity of coastal ecosystems, making an important contribution to the primary production of the coastal areas in the Arctic.

Over the Arctic Ocean, the concentration of nutrients is limiting the development of phy- toplankton, and hence the whole ecosystem. The main source of nutrients in the Arctic is river runoff and remineralization. However, there are local features of the functioning of coastal ecosystems, they are associated with the supply of nutrients from the glacier streams. Experiments with samples of rocks (represented by dolomitic shales and limestone) have been conducted to test the hypothesis that the main source of nutrients for coastal ecosystems are the rocks forming the bedrock of glacier streams. Exposure of rock samples in distilled water was held from 5 to 14 days and the content of nutrients has increased. As a result of labora- tory experiments, the leaching rates were obtained. The rates are 0.021-0.15 mmol/m2 day and 0.1-2.5 mmol/m2 day for total nitrogen and total inorganic carbon, respectively. The concentration of nutrients (0.3-33 µM of nitrogen, 214-1928 µM of total inorganic carbon) in glacial streams confirms this assumption. Field and experimental data show that the glacial runoff from the Arctic archipelagos contains a significant amount of nutrients that can directly affect the activity of coastal ecosystems, making an important contribution to the primary production of the coastal areas in the Arctic.

 Arctic biogeochemistry glacial streams nutrient weathering Arctic biogeochemistry glacial streams nutrient weathering This work was supported by the State Agreement of The Ministry of Science and Education of Russian Federation (theme # 0128- 2021-0016 and theme # 121041500216-3); by the Russian Foundation for Basic Research projects # 18-05-60246 (processing geochemistry samples) and 18-05-60069 (processing hydrochemistry data); by the Grant of the President of the Russian Federation for state support of young Russian scientists - candidates of science, research project MK- 860.2020.5 (processing carbonate chemistry data); by the Research Council of Norway project 246752 “POMPA - Pollutants and carbonate system parameters in polar environment media: snow-ice- 12 of 15 ES4002 polukhin et al.: leaching of inorganic carbon ES4002 seawater-sediments-coastal discharge”

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