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Found 16 results.

Other language confidence: 0.9317418339948036

Hydrochemistry, carbon dynamics, and calculated pCO2 and CO2 fluxes, and soil-derived natural organic matter characteristics from the White Main, a granitic headwater stream in Germany, 2023-2024

This dataset contains hydrochemical and soil data collected along the first 1.3 km downstream of the White Main spring in northern Bavaria, Germany, from March 2023 to November 2024. Stream water samples were analyzed for in situ parameters, including discharge, water temperature [°C], pH [-], redox potential [mV], and electrical conductivity [µS/cm], as well as laboratory-measured parameters, including major ions and trace metals [mmol/l], alkalinity [mmol/l], dissolved inorganic and organic carbon concentrations (DIC, DOC [mmol/l]), and their stable isotope ratios (δ13CDIC/DOC [‰ VPDB]). In addition, calculated partial pressure of CO2 (pCO2 [µatm]) and carbon dioxide fluxes (FCO2 [mmol m⁻² d⁻¹]) are provided for the stream water samples. The dataset also contains laboratory measurements related to soil-derived natural organic matter from acid and base extracts of soil samples, including zeta potential [mV], particle size distribution [%], ultraviolet-visible absorbance (UV-VIS), and fluorescence measurements. UV-VIS absorbance and fluorescence measurements were additionally performed on stream water samples. The datasets were collected to characterize hydrochemistry, carbon concentrations, carbon dioxide dynamics, and soil-derived organic matter properties in a granitic headwater stream and to provide a basis for reuse in studies of headwater biogeochemistry, carbon cycling, and soil-water interactions.

Grain size distribution of soil samples from the White Main catchment, Germany, November 2024

This dataset contains grain size classifications and class proportions of dried soil samples from the White Main catchment in northern Bavaria, Germany. It includes sample dry mass, grain size classes, minimum and maximum grain size ranges, and the relative proportion of each grain size class.

Fluorescence spectra of acid- and base-treated soil extracts from the White Main catchment, Germany, November 2024

This dataset contains fluorescence spectra of acid- and base-treated soil extracts from soil samples collected at three locations within the White Main catchment in northern Bavaria, Germany. Fluorescence intensities from 240 to 400 nm were measured to characterize soil-derived organic matter properties.

Carbon concentrations, stable carbon isotopes, calculated pCO2 and CO2 fluxes from the White Main headwater stream, Germany, 2023–2024

This dataset contains laboratory-measured alkalinity, dissolved inorganic and organic carbon concentrations, δ13C values of DIC and DOC, and calculated pCO2, CO2 fluxes, and k600 from stream water samples collected along the White Main headwater stream in northern Bavaria, Germany, from March 2023 to April 2024.

UV-Vis absorbance spectra of soil sample acid-base extracts from the White Main catchment, Germany, November 2024

This dataset contains UV-Vis absorbance spectra of acid and base extracts from soil samples collected at three locations within the White Main catchment in northern Bavaria, Germany. Absorption coefficients were measured between 230 and 698 nm using a microplate spectrophotometer to characterize soil-derived dissolved organic matter properties.

Major ions and trace elements from the White Main headwater stream, Germany, 2023–2024

This dataset contains major anion, major cation, and trace element concentrations measured in stream water samples collected along the White Main headwater stream in northern Bavaria, Germany, from March 2023 to April 2024. Analyses include fluoride, chloride, sulfate, nitrate, sodium, magnesium, potassium, silicon, calcium, aluminium, manganese, and iron.

Seasonal Dataset of DIC, δ13CDIC, DOC, δ13CDOC, pCO2(aq), FCO2 and Biogeochemical Parameters in the Danube River (2023–2024)

This dataset contains dissolved inorganic/organic carbon (DIC/DOC) concentrations, its stable isotope ratios (δ13CDIC/DOC), partial pressure of carbon dioxide in the water column pCO₂(aq) (pCO2(aq)) and area-integrated CO₂ emission rates derived from flux calculations (FCO2; g C d⁻¹), along with corresponding parameters (temperature, pH, calcium, bicarbonate) collected from the Danube River and its key tributaries during five seasonal sampling campaigns in 2023 and 2024. Water samples were collected using a weighted 2 L sampling bottle submerged 1–2 meters below the surface, with sampling conducted from the river center via bridges or passenger boats, and occasionally from the riverbank. In situ temperature measurements were taken with a multiparameter instrument (HQ40d, HACH™, Loveland, CO, USA). δ13ODIC/DOC was analyzed using a OI Analytical Aurora 1030W-IRMS. This dataset is providing valuable insights into carbon dynamics in a large river system and support investigations of biogeochemical cycling. It further can inform ecosystem management and conservation strategies under changing environmental conditions.

Fluorescence spectra of stream water samples from the White Main headwater stream, Germany, 2023–2024

This dataset contains fluorescence spectra of stream water samples collected from the White Main headwater stream in northern Bavaria, Germany, from August 2023 to April 2024. Fluorescence intensities from 240 to 400 nm were measured to characterize dissolved organic matter properties.

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.

UV-Vis absorbance spectra of stream water samples from the White Main headwater stream, Germany, 2023–2024

This dataset contains UV-Vis absorbance spectra of stream water samples collected from the White Main headwater stream in northern Bavaria, Germany, from August 2023 to April 2024. Absorption coefficients between 230 and 700 nm were measured using a microplate spectrophotometer to characterize dissolved organic matter properties.

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