Carbon utilization in the Eurasian sector of the Arctic Ocean

Article Abstract:

Shelf areas appear to be the major productivity sites for carbon utilization in the Eurasian sector of the Arctic Ocean. Utilized carbon flux is approximately 0.022 Gton C year(-1) from the Barents-Kara and Laptev Seas. A measure of apparent carbon utilization was derived by application of a C/N ratio to calculated nitrate deficits and excesses, based on preformed nitrate concentrations of source waters, a fractionation model and measured nitrate concentrations.

Arctic Ocean, Carbon cycle (Biogeochemistry), Carbon cycle

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A novel microsensor for determination of apparent diffusivity in sediments

Article Abstract:

A microsensor can be used to determine apparent diffusivity of gas in pore waters and biofilms. The sensor has an internal diffusion barrier within the tip, through which gas flows from an internal reservoir into the surrounding medium. The concentration of gas at the sensor's tip indicates the apparent diffusivity. A mathematical model shows how the signal is interpreted as a function of diffusivity.

Research, Usage, Gases, Sensors, Marine sediments, Diffusion, Diffusion (Physics), Sediments (Geology)

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The contribution of macrophyte-derived organic matter to microbial biomass in salt-marsh sediments: stable carbon isotope analysis of microbial biomarkers

Article Abstract:

A close coupling is believed to exist between macrophyte productivity and microbial processes in salt-marsh sediments. Macrophytes dominate the productivity of tidal salt marshes, highly productive ecosystems where the highest rates of mineralization have been detected. The contribution of local plant production to bacterial biomass is variable and depends on the input of nonmacrophyte material.

Netherlands, Tidal marshes, Salt marshes, Ecological research

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