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Radiographs of the gravity core HE443/10-3 from North Sea

Radiographs of gravity core HE443/10-3 that was collected in the Helgoland mud area. The radiographs were produced about 8 months after coring and sampling. The white spots derive from previous sediment sampling that was performed onboard through windows that were cut into the core liner. The core shows intervals with intact sedimentary structures, but also intervals that are strongly mixed by bioturbation.

Pore-water and solid-phase data of a multicorer core and a gravity core at Station HE443/10, North Sea

This is a compilation of pore-water and solid-phase data for station HE443/10 in the Helgoland mud area (German Bight, North Sea). The data derive from a multicorer core (HE443/10-2) and a gravity core (HE443/10-3) which were collected during a RV HEINCKE Expedition in 2015 in order to study iron reduction processes that are linked to methane formation and oxidation. Solid-phase geochemical data includes the bulk elemental composition or the sediment as well as sequential extraction data including reactive iron oxides and sulfides. Furthermore, the stable iron isotope composition of dissolved iron and in sequentially extracted Fe pools has been determined.

Seasonal (years 2020-2021) dynamics in pore water composition under impact of submarine groundwater discharge in front of a coastal peatland, southern Baltic Sea

The data set contains the results for the porewater composition of samples, collected from different (up to 11) depths (down to 4.5 mbsf) at two sites in front of the Hütelmoor, southern Baltic Sea. Porewater was under impact by submarine groundwater discharge and collected during 6 field campaigns in years 2020 and 2021 using permanent multi-port samplers. Stable isotope signatures (H, C, O, S), major, and trace element data are presented to characterize the mixture between the endmembers freshwater and the brackish surface water component, superimposed by benthic diagenesis.

Mean sediment grain size, total organic carbon content, and carbon isotopic compositions of TOC and solid-phase extracted DOC in bottom water and porewater samples from the German Bight of the North Sea, during RV Heincke cruises HE582 and HE595

This data summarizes site information, sediment textural properties, and bulk geochemical parameters from the same sampling campaigns, including mean grain size, total organic carbon (TOC) content, and carbon isotopic compositions (δ¹³C and F¹⁴C) of both TOC and SPE-DOC in bottom water (BW) and porewater (PW) samples. These data establish the baseline for evaluating the sources, reactivity, and age of organic carbon in sediments and porewaters of the German Bight. Together with the molecular results in doi:10.1594/PANGAEA.989754, they constrain the coupling between sedimentary organic carbon pools and dissolved organic matter dynamics in this shallow-marine environment.

Dissolved organic carbon and solid-phase extracted DOC, and Fourier Transform Ion Cyclotron Resonance Mass Spectrometry results for bottom water and porewater samples collected from the German Bight, during RV Heincke cruises HE582 and HE595

This dataset presents detailed information on the sampling sites, dissolved organic carbon (DOC) concentrations, and molecular characteristics of solid-phase extracted DOC (SPE-DOC) from bottom water (BW) and porewater (PW) samples collected in the German Bight, North Sea, during RV Heincke cruises HE582 and HE595. The data include average elemental compositions (C, H, O, N, S, P) and relative abundances of major compound classes and structural groups derived from FT-ICR-MS analysis. These molecular-level results provide insights into compositional differences between BW and PW DOM and reveal the selective preservation and transformation processes governing organic matter across the sediment–water interface.

Solid phase geochemistry of a multicorer core and a gravity core at Station HE443/10, North Sea

Solid-phase samples were collected onboard (RV Heincke expedition HE443) using cut-off syringes. The MUC was sliced and sampled. For sampling the GC, small windows were drilled into the liner through which the syringes were introduced. All samples were stored anoxically and frozen at -20°C until processing. The processing involved freeze-drying and grinding before splitting the samples for the different kinds of analyses.

Pore-water data of a multicorer core and a gravity core at Station HE443/10, North Sea

Pore water was collected onboard (RV Heincke expedition HE443) by use of rhizons that were inserted into the cores through drilled holes in the core liners. Samples were preserved and analyses were performed onshore (at AWI) shortly after the expedition.

Salt- corrected chemical compounds, elemental concentrations and Ni isotope data of the solid phase for sediment cores collected during ALKOR cruise AL543

The reactivity and isotope fractionation of Ni is strongly influenced by biological and redox-related processes in the ocean, giving the isotope system (expressed as δ60 Ni) some potential for studying past ocean environments. This requires, however, a profound understanding of its modern elemental and isotopic oceanic mass balance. In order to better understand mechanisms determining fluxes of Ni and its isotopes from the sediment-porewater system in reducing ocean settings, we present trace metal concentrations and Ni isotope data from sediments, porewaters and the water column of the shallow-water Kiel Bight, in the southwestern Baltic Sea. The samples were collected during RV Alkor cruise AL543. Trace metal concentrations in porewater, bottom water and BTP bottom water samples were measured on a Thermo Scientific Element XR and Nickel isotope compositions were measured using a Thermo Scientific Neptune Plus MC-ICP-MS. Digestion solutions of sediments and suspended particulate matter were measured by ICP-OES.

Bottom Water (collected with the benthic trace profiler (BTP)) geochemical and Ni isotope data collected during ALKOR cruise AL543

The reactivity and isotope fractionation of Ni is strongly influenced by biological and redox-related processes in the ocean, giving the isotope system (expressed as δ60 Ni) some potential for studying past ocean environments. This requires, however, a profound understanding of its modern elemental and isotopic oceanic mass balance. In order to better understand mechanisms determining fluxes of Ni and its isotopes from the sediment-porewater system in reducing ocean settings, we present trace metal concentrations and Ni isotope data from sediments, porewaters and the water column of the shallow-water Kiel Bight, in the southwestern Baltic Sea. The samples were collected during RV Alkor cruise AL543. Trace metal concentrations in porewater, bottom water and BTP bottom water samples were measured on a Thermo Scientific Element XR and Nickel isotope compositions were measured using a Thermo Scientific Neptune Plus MC-ICP-MS. Digestion solutions of sediments and suspended particulate matter were measured by ICP-OES.

Porewater geochemical and Ni isotope data for sediment cores collected during ALKOR cruise AL543

The reactivity and isotope fractionation of Ni is strongly influenced by biological and redox-related processes in the ocean, giving the isotope system (expressed as δ60 Ni) some potential for studying past ocean environments. This requires, however, a profound understanding of its modern elemental and isotopic oceanic mass balance. In order to better understand mechanisms determining fluxes of Ni and its isotopes from the sediment-porewater system in reducing ocean settings, we present trace metal concentrations and Ni isotope data from sediments, porewaters and the water column of the shallow-water Kiel Bight, in the southwestern Baltic Sea. The samples were collected during RV Alkor cruise AL543. Trace metal concentrations in porewater, bottom water and BTP bottom water samples were measured on a Thermo Scientific Element XR and Nickel isotope compositions were measured using a Thermo Scientific Neptune Plus MC-ICP-MS. Digestion solutions of sediments and suspended particulate matter were measured by ICP-OES.

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