PANGAEA_993653 Seasonal Dataset of DIC, δ13CDIC, DOC, δ13CDOC, pCO2(aq), FCO2 and Biogeochemical Parameters in the Danube River (2023–2024) Maier, Jan; Barth, Johannes Arthur Seasonal Dataset of DIC, δ13CDIC, DOC, δ13CDOC, pCO2(aq), FCO2 and Biogeochemical Parameters in the Danube River (2023–2024) 2026-04-27 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.993653 Investigator Jan Maier jan.m.maier@fau.de Earth Science Season Sample ID DATE/TIME LATITUDE LONGITUDE River River kilometer Temperature, water pH Carbon, inorganic, dissolved δ13C, dissolved inorganic carbon Carbon, organic, dissolved δ13C, dissolved organic carbon Carbon dioxide, partial pressure Transfer velocity, scaled Surface area Carbon dioxide, emission rate Bicarbonate Calcium ion geoscientificInformation Carbon cycling CO2 fluxes DALIA Danube River dissolved in organic carbon (DIC) dissolved organic carbon (DOC) fCO2 isotope analysis pCO2 seasonal fluctuations tributary Water sampler weathering Portable 2-channel multimeter, Hach, HQ40D TIC–TOC analyzer, OI Analytical, Aurora 1030W PHREEQC modeling Acid titration, 0.16N H2SO4 Inductively Coupled Plasma Mass Spectrometry, Thermo Fisher Scientific, iCap Q ICP-MS 2023-07-07 2024-09-04 Complete 43.621077 49.025942 8.154897 29.344149 access rights needed CC-BY-4.0: Creative Commons Attribution 4.0 International (License comes into effect after moratorium ends) English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 5554 data points text/tab-separated-values Maier, Jan; Barth, Johannes Arthur (in review): Geological, land use and biological influences on carbon cycling and CO2 degassing in the Danube River. Scientific Reports Maier, Jan; Visser, Anna-Neva; Schubert, Christina Martina; Wander, Simon Thomas; Barth, Johannes Arthur (2025): Seasonal Dataset of DO, δ¹⁸ODO and Biogeochemical Parameters in the Danube River (2023–2024) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.983395

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. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.993653"!

http://en.wikipedia.org/wiki/ISO_6709 LATITUDE http://en.wikipedia.org/wiki/ISO_6709 LONGITUDE http://en.wikipedia.org/wiki/ISO_8601 DATE/TIME http://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/ PHREEQC modeling https://doi.pangaea.de/10.1594/PANGAEA.983395 Seasonal Dataset of DO, δ¹⁸ODO and Biogeochemical Parameters in the Danube River (2023–2024) DIF 9.4 2026-04-27 2026-04-27