Phosphates and silicates in sea ice of the high-latitudinal Arctic: Data of the North Pole-34 drifting ice station |
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| Authors: | A P Nedashkovskii S V Khvedynich T V Petrovskii |
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| Institution: | (1) Il’ichev Pacific Oceanological Institute, Far East Division, Russian Academy of Sciences, Vladivostok, Russia;(2) Arctic and Antarctic Scientific Research Institute, St. Petersburg, Russia |
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| Abstract: | The dynamics of phosphates and silicates in sea ice of the high-latitudinal Arctic are considered for the period from November 2005 to May 2006. It is shown that, during the ice formation, silicates are included into it in the same ratio to the salinity that is characteristic of the under-ice water. The further dynamics of silicates are determined by their bioassimilation with the beginning of the polar day and by the biogenic silicon accumulation at the bottom meltwater pools with subsequent leaching. Phosphates are included into ice in a ratio higher than that occurring in the under-ice water. This is caused by the fact that the liquid phase of sea ice represents the composition of the surface microlayer (SML) at the ice-water interface, which is enriched in organic matter and in the products of its destruction (particularly, in phosphates). With the onset of the polar day, the content of phosphates first markedly increases (due to the photo oxidation of biogenic organic matter) and then decreases because of bioassimilation. At the beginning of the polar day, the primary production of diatoms was estimated to be ～0.3 mg C/m2 day. |
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