Porewater nutrients from sediments collected during the SWERUS-C3 expedition 2014 on the East Siberian shelf and slope

Volker Brüchert, Xiaole Sun

This dataset contains the major nutrients ammonium, dissolved silica, dissolved inorganic phosphate collected from the porewaters of sediment from 16 stations in the Laptev and East Siberian Sea in water depths between 3200 m and 40 m collected in July and August 2014.

These nutrient data were used with reaction transport model to calculate the exchange rates of major nutrients between sediment and seawater on the Siberian shelf and slope in the Laptev and East Siberian Sea. The data were then used to estimate the contribution of the sediment to seawater flux for the overall nutrient budget of the East Siberian shelf sea.

The data provide new insights of the role of the shelf sediments in modifying the nutrient stoichiometry of the Arctic shelf Sea by producing a strong nitrogen deficit.

Citation

Volker Brüchert, Xiaole Sun (2021) Porewater nutrients from sediments collected during the SWERUS-C3 expedition 2014 on the East Siberian shelf and slope. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/oden-swerus-2014-porewater-nutrients-1

References

Sun X, Humborg C, Mörth CM, Brüchert V (2021) The Critical Role of Sedimentary Nitrogen, Phosphorus, and Silica Cycling for the Nutrient Budget of the Laptev and East Siberian Shelf Sea. Global Biogeochemical Cycles (accepted)

Data description

The dataset is provided in spreadsheet tables with information to support understanding of the reaction transport model employed by the study by Sun et al. Table S1 contains the original porewater nutrient and Fe data from all SWERUS-C3 stations that are included in this study and are used to calibrate and verify the model. Table S2 gives the boundary conditions, the modeling depths and coefficients of diffusion, bioturbation and bioirrigation for each modelled station. These two table provide full information for reproducing the results of our study.

Table S1

Original porewater concentrations of DSi, NH₄, PO₄ and Fe2+ (µM) in sediments of the SWERUS-C3 stations included in this study. The nutrients were analyzed by a QuAAtro flow injection analyzer and Fe was measured by ICP-OES with analytical precision better than 5%.

Table S2

Boundary conditions and the coefficients used by the reaction transport model. The model was run many times for each station until the best fit of the model outputs onto the measured profiles was achieved.

Supporting table

Boundary conditions for porewater modelling

File type: Excel worksheet 2019

Comments

Information about the SWERUS-C3 expedition is available from the Swedish Polar Research Secretariat. See also SWERUS-C3 program website, managed by the Department of Geological Sciences, Stockholm University.