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s/dnoc/DOC/gi

Chemical and biological characterisation of slicks off the German coast of the Baltic Sea in June of 2024 at 9 stations

To characterise slicks chemically and biologically, on 13th, 16th and 18th of June 2024, slicks and underlying water (depth 1m) were sampled at a total of 9 closely clustered stations in the Baltic Sea off the coast of Warnemünde, Germany. On 13.06. and 16.06. samples were taken in the evening, on the 18.06. samples were taken in the morning. On site, salinity (portable Total Dissolved Solids (TDS)-meter CO-330), water temperature (portable Total Dissolved Solids (TDS)-meter CO-330), wind speed (hand-held anemometer model MS6252A) and light intensity (Galaxy Sensors phone app v.1.10.1) were measured. Slick samples were taken with a glass plate sampler (), samples of the underlying water were taken by a syringe connected to a weighted hose. The samples were fixed as needed and analysed for dissolved organic carbon (DOC) concentration, total dissolved nitrogen (TDN) concentration, surfactant (SAS) concentration, viral particle concentration and cellular abundance of phytoplankton in different size classes (pico-, nano- and microphytoplankton). DOC and TDN concentrations were analysed by high temperature catalytic combustion, SAS concentrations by the voltametric technique with a hanging mercury drop electrode (Ćosović and Vojvodić 1998; Rickard et al. 2019). The concentrations of viral particles and phytoplankton were assessed by flowcytometry (BD Accuri C6 flow cytometer).

Extracellular dissolved organic carbon (DOC) concentrations in axenic and xenic cultures of Thalassiosira gravida in response to varying temperatures and photoperiods

This dataset comprises dissolved organic carbon (DOC) concentrations from axenic and xenic cultures of Thalassiosira gravida that were cultivated at the Alfred-Wegener-Institute (Bremerhaven, Germany) in March, 2023. After a cell density of ~ 15.000 cells * mL-1 was reached, cultures were filtered through a 0.2 µm polycarbonate (PC) filter (Whatman) that was cleaned by soaking in 10 % hydrochloric acid (HCl, Merck suprapure) for at least 12 h and subsequently rinsing with ultrapure water (Merck Millipore MilliQ). DOC was quantified by high temperature catalytic oxidation with a Shimadzu TOC analyzer (VCPN-TOC, Shimadzu) according to Garzón-Cardona et al. 2024; doi: 10.1016/J.JMARSYS.2023.103893. Cultures were grown under two temperatures (9 °C, 13.5 °C) and two photoperiods (16:8 h, 24:0 h light:dark). The aim was to investigate responses of algal extracellular release and bacterial DOC transformation to marine heatwave-like conditions.

Dissolved and particulate trace metal and rare earth element (REE) concentrations during a mesocosm based phytoplankton bloom simulating intertidal coastal conditions

We analyzed concentrations of dissolved and particulate trace metals, including iron (Fe), manganese (Mn), vanadium (V), molybdenum (Mo), thallium (Tl), and rare earth elements (REE), during a mesocosm-based phytoplankton summer bloom mimicking the intertidal zone of the southern North Sea (Jade Bay). The studies aimed to identify key drivers controlling their biogeochemical cycling in dynamic, high-productivity coastal environments. Our results highlight the tidally influenced coastal zone as a critical interface that alters the behavior of supposedly conservative elements such as Mo and Tl (Mori et al., 2021) as well as natural and anthropogenic REE (incl., lanthanum, samarium, and gadolinium) (Mori et al., under review). Trace metal concentrations and shale-normalized REE patterns, determined by quadrupole inductively coupled plasma–mass spectrometry (ICP-MS) and inductively coupled plasma–optical emission spectrometry (ICP-OES), were combined with biogeochemical bulk parameters and pigment-based assessments of phytoplankton growth and community composition (Mustaffa et al., 2020). Trace metal and REE cycling were evaluated in relation to phytoplankton dynamics, particulate organic matter composition (C, N, P), dissolved organic carbon, total dissolved nitrogen, and macronutrient concentrations (nitrate, ammonium, silicate, and inorganic phosphate). The dataset was obtained during a Planktotron-based mesocosm experiment conducted within the framework of the Coastal Ocean Darkening project (Mustaffa et al., 2020).

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.

Biogeochemical variables from a Multidisciplinary BASS Mesocosm Study at Wilhelmshaven, 2023

This dataset contains biogeochemical variables measured during the same mesocosm experiment at Sea Surface Facility (SURF) in Wilhelmshaven, Germany (53.5148° N, 8.1461° E) in 2023. Variables include surfactants and nutrient concentrations, chlorophyll a, pigments, particulate and dissolved organic carbon and nitrogen, and several other biogeochemical parameters. These data complement the daily averaged physical parameters (PANGAEA DOI: https://doi.pangaea.de/10.1594/PANGAEA.983975) and together support the assessment of ecosystem and biogeochemical dynamics associated with the experiment, as described in the related publication Bibi et al., 2025.

Distribution of contaminants from the Elbe outflow into the North Sea (German Bight) based on water samples from the MOSES cruise Sternfahrt 10 in 2023

The Sternfahrt-10 of the MOSES campaign, from 29th August until the 15th of September 2023, had two objectives. One was to follow the dispersion of pollutants transported by the Elbe water into the North Sea, previously observed during the Elbe-Freshwater and Elbe-Tidal cruises. And second the distribution of the Elbe water within the German Bight. Therefore, drifter groups were deployed to follow individual water parcels. Those drifters were followed subsequently by three ships (RV Ludwig Prandtl, RV Littorina, RV Mya II), to extend the time period of measurements. Along the tracks, water samples were taken close to the drifters, alternatively at stations from previous cruises, resulting in 12 to 24 sampling points per week. In terms to detect the concentration of a variety of nutrients and carbon compounds from the south-eastern North Sea up to the island Amrum. Additionally, basic hydrographic parameters and greenhouse gases were sampled continuously throughout the whole cruise. Those results are not part of the present dataset, but can be found here, https://doi.org/10.1594/PANGAEA.971874. To ensure the comparability of the measured parameters a transportable container laboratory was passed from ship to ship always equipped with the same sensor systems. Just for specific water samples some special equipment was added. A map of the different tracks as well as information about the used sensors and data treatment, you can find in the additional material. For more detailed information about the MOSES Project and the cruise Sternfahrt-10, see the article cited in references.

Physical, chemical, and biogeochemical parameters from a mesocosm experiment at the Sea Surface Facility (SURF), Wilhelmshaven, Germany, spring 2023

This collection (bundled publication) includes datasets from a mesocosm experiment conducted in spring 2023 at the Sea Surface Facility (SURF), Wilhelmshaven, Germany (53.5148° N, 8.1461° E). The experiment initiated a phytoplankton bloom under controlled conditions to examine surface ocean biogeochemistry and sea-surface microlayer (SML) processes. Daily samples were collected from the SML and underlying water (40 cm depth) and analyzed for physical, chemical, and biological parameters. Measurements include meteorological conditions (air temperature, solar irradiance, and albedo), surfactants, nutrients, pigments, particulate and dissolved organic carbon and nitrogen, and additional biogeochemical variables. These datasets provide environmental and biogeochemical context supporting studies on surface ocean processes and are described in detail in the related publication Bibi et al. (2025).

Nachhaltige Erzeugung und Verwertung von Rohrkolben auf Niedermoorstandorten in Niedersachsen, Teilvorhaben 12: Wissenschaftliche Begleituntersuchungen auf den Anbauflächen: Erfassung von Treibhausgasaustausch und Wasserhaushalt

Ziel des Vorhabens ist die Transformation der Bewirtschaftung von entwässerten, landwirtschaftlich genutzten Niedermoorböden hin zu einer klimaschonenden, moorbodenkonservierenden Nassbewirtschaftung durch den Anbau von Rohrkolben. Hierzu soll in zwei Modellregionen mit unterschiedlicher landwirtschaftlicher Struktur (Emsland und Cuxhaven) die großflächige, qualitätsoptimierte Erzeugung von Rohrkolben (Typha angustifolia und Typha latifolia) und die Verwertung der Biomasse als Baustoff und als Gartenbausubstrat (Torfersatz) entwickelt, demonstriert und für die Vermarktung vorbereitet werden. Das Teilvorhaben des Thünen-Instituts befasst sich mit dem Treibhausgasaustausch und dem Wasserhaushalt der Paludikulturen sowie intensiv landwirtschaftlich genutzter Referenzstandorte. Dabei kommt für die Messung des Austauschs von Kohlendioxid (CO2) und Methan (CH4) der Paludikulturen die Eddy-Kovarianz-Methode zum Einsatz, während an den Referenzstandorten CO2 mittels Eddy-Kovarianz und CH4 sowie Lachgas manuell mit Hauben gemessen werden. Daneben werden Steuerfaktoren wie Wasserstände und Nährstoffgehalte des Torfs sowie Änderungen der Geländehöhen erfasst. Insbesondere die erstmalige Messung von CH4-Emissionen mit der Eddy-Kovarianz-Methode werden zum Verständnis des vieldiskutierten, aber bisher wenig untersuchten Emissionsverhaltens von Typha-Paludikulturen beitragen und die Quantifizierung der Emissionsminderung durch diese Paludikulturen ermöglichen. Die Erfassung der Wasserhaushaltsgrößen erfolgt über die Messung oberirdischer Komponenten sowie eine Modellierung des Grundwasserzustroms. Die entsprechenden Ergebnisse werden Erkenntnisse zum Wasserbedarf von Typha-Paludikulturen liefern sowie zur Berechnung von Ein- und Austrägen gelöster Stoffe (Nährstoffe, gelöster organischer Kohlenstoff) genutzt werden.

Fließgewässermessstelle km 2,75 oh Wehr, Schondra

Die Messstelle km 2,75 oh Wehr (Messstellen-Nr: 21138) befindet sich im Gewässer Schondra in Bayern. Die Messstelle dient der Überwachung des biologischen Zustands, des chemischen Zustands, des Grundwasserstands im oberen Grundwasserstockwerk.

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