Abstract

On cruise 76 in 2019, the R/V Akademik Mstislav Keldysh completed the Gulf of Ob–Kara Sea slope transect. Samples of bottom water and two sediment layers 1 cm thick were obtained with a multicorer. The silicon, mineral and total phosphorus, and organic nitrogen concentrations were measured in them. The magnitude of fluxes of these nutrients at the water–bottom boundary along the transect was calculated; they are all positive, i.e., directed from sediment to water. Comparison of silicon and phosphates fluxes obtained in the transect in 2019 with fluxes measured on a similar transect in 2007 showed good agreement. Silicon fluxes along the transect vary little (less than two times), including the frontal river–sea mixing zone. Mineral phosphorus fluxes have two maxima: in pure river waters and on the slope of the Kara Sea. In the area of the lens of freshened waters, phosphorus fluxes can have an alternating character, depending on season, the state of production, and destructive processes. A method is proposed for comparing fluxes of different nutrients in order to establish the nature of their variability along the transect and to identify measurement errors.

中文翻译：

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鄂毕河口孔间-底水系统中营养物的浓度和扩散

摘要

R / V Akademik Mstislav Keldysh在2019年的76航次上完成了Ob–Kara海湾海坡样带。用multicorer获得了底部水和两个1 cm厚的沉积物层的样品。测量了其中的硅，矿物质和总磷以及有机氮的浓度。计算了沿横断面水底边界处这些养分的通量大小；它们都是积极的，即从沉积物到水。将2019年该样带中获得的硅和磷酸盐通量与2007年在类似样带上测得的通量进行比较，结果显示出很好的一致性。沿着样带的硅通量变化很小（不到两次），包括额河海混合区。矿物质磷通量有两个最大值：在纯净的河水中和在卡拉海的斜坡上。在新鲜水的晶状体区域，磷通量可能具有交替性，具体取决于季节，生产状态和破坏性过程。提出了一种方法，用于比较不同养分的通量，以便确定其沿样条线的变异性并确定测量误差。