Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 Friedrich-Alexander-Universität, Erlangen-Nürnberg https://ror.org/00f7hpc57 Barth Johannes Arthur johannes.barth@fau.de Friedrich-Alexander-Universität, Erlangen-Nürnberg https://ror.org/00f7hpc57 2026 Seasonal Dataset of DIC, δ13CDIC, DOC, δ13CDOC, pCO2(aq), FCO2 and Biogeochemical Parameters in the Danube River (2023–2024) dataset https://doi.pangaea.de/10.1594/PANGAEA.993653 2026-04-27T06:34:19 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. Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 Barth Johannes Arthur johannes.barth@fau.de in review Geological, land use and biological influences on carbon cycling and CO2 degassing in the Danube River journal article Scientific Reports Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 Visser Anna-Neva anna-neva.visser@fau.de Schubert Christina Martina christina.cs.schubert@fau.de Wander Simon Thomas simon.wander@fau.de Barth Johannes Arthur johannes.barth@fau.de 2025 Seasonal Dataset of DO, δ¹⁸ODO and Biogeochemical Parameters in the Danube River (2023–2024) dataset https://doi.org/10.1594/PANGAEA.983395 8.154897 29.344149 43.621077 49.025942 18.675788290858723 46.49611125678669 2023-07-07T00:00:00 2024-09-04T00:00:00 -1.0 -1.0 uncoded table Horizon Europe HorizonEU https://research-and-innovation.ec.europa.eu/funding/funding-opportunities/funding-programmes-and-open-calls/horizon-europe_en https://doi.org/10.13039/100018693 101094070 DALIA - Danube Region Water Lighthouse Action doi:10.3030/101094070 DALIA 48.095297 8.154897 -1.0 45.172488 29.344149 -1.0 Water sampler 5554 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ Season Season Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 of sampling Season Sample ID Sample ID Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 Sample ID DATE/TIME Date/Time http://en.wikipedia.org/wiki/ISO_8601 Time T http://dbpedia.org/resource/Time Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 Date/Time LATITUDE Latitude http://en.wikipedia.org/wiki/ISO_6709 Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 Latitude LONGITUDE Longitude http://en.wikipedia.org/wiki/ISO_6709 Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 Longitude River River river http://purl.obolibrary.org/obo/ENVO_00000022 Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 River River kilometer River km km Length L http://dbpedia.org/resource/Length Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 upstream River km [km] Temperature, water Temp °C Temperature Θ http://dbpedia.org/resource/Temperature water http://purl.obolibrary.org/obo/CHEBI_15377 Portable 2-channel multimeter, Hach, HQ40D Hach HQ40D - Multi 2 Channels Portable Two Channel Multi Meter http://vocab.nerc.ac.uk/collection/L22/current/TOOL1481/ Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 Temp [°C] pH pH Portable 2-channel multimeter, Hach, HQ40D Hach HQ40D - Multi 2 Channels Portable Two Channel Multi Meter http://vocab.nerc.ac.uk/collection/L22/current/TOOL1481/ Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 pH Carbon, inorganic, dissolved DIC mmol/l carbon C https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:27594 dissolved http://purl.obolibrary.org/obo/PATO_0001986 Molar Concentration TIC–TOC analyzer, OI Analytical, Aurora 1030W Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 DIC [mmol/l] δ13C, dissolved inorganic carbon δ13C DIC ‰ PDB δ13C http://en.wikipedia.org/wiki/List_of_elements_by_stability_of_isotopes dissolved inorganic carbon DIC TIC–TOC analyzer, OI Analytical, Aurora 1030W Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 vs. VPDB δ13C DIC [‰ PDB] Carbon, organic, dissolved DOC mmol/l carbon C https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:27594 organic dissolved http://purl.obolibrary.org/obo/PATO_0001986 Molar Concentration TIC–TOC analyzer, OI Analytical, Aurora 1030W Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 DOC [mmol/l] δ13C, dissolved organic carbon δ13C DOC ‰ PDB δ13C http://en.wikipedia.org/wiki/List_of_elements_by_stability_of_isotopes dissolved organic carbon TIC–TOC analyzer, OI Analytical, Aurora 1030W Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 vs. VPDB δ13C DOC [‰ PDB] Carbon dioxide, partial pressure pCO2 µatm carbon dioxide http://purl.obolibrary.org/obo/CHEBI_16526 partial pressure Energy Density http://dbpedia.org/resource/Energy_density Force Per Area PHREEQC modeling http://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/ Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 pCO2 [µatm] Transfer velocity, scaled k600 m/d Linear Velocity http://dbpedia.org/resource/Velocity Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 gas transfer velocity k600 [m/d] Surface area Surface m**2 surface area https://en.wikipedia.org/wiki/Surface_area Area http://dbpedia.org/resource/Area Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 Surface [m**2] Carbon dioxide, emission rate CO2 ER g/d carbon dioxide http://purl.obolibrary.org/obo/CHEBI_16526 Mass per Time Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 CO2 ER [g/d] Bicarbonate [HCO3]- mmol/l bicarbonate https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:17544 Molar Concentration Acid titration, 0.16N H2SO4 Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 [HCO3]- [mmol/l] Calcium ion Ca2+ mmol/l calcium ion http://purl.obolibrary.org/obo/CHEBI_39124 Molar Concentration Inductively Coupled Plasma Mass Spectrometry, Thermo Fisher Scientific, iCap Q ICP-MS inductively-coupled plasma mass spectrometers http://vocab.nerc.ac.uk/collection/L05/current/LAB15/ Thermo Finnigan {Thermo Fisher Scientific} Neptune inductively coupled plasma mass spectrometer http://vocab.nerc.ac.uk/collection/L22/current/TOOL0462/ Maier Jan jan.m.maier@fau.de 0009-0000-5925-0002 Ca2+ [mmol/l] CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels Carbon cycling CO2 fluxes Danube River dissolved in organic carbon (DIC) dissolved organic carbon (DOC) fCO2 isotope analysis pCO2 seasonal fluctuations tributary weathering author111461 author111462 author111463 author111464 author82895 award4063 curlevel30 event3268066 funder21271 geocode1599 geocode1600 geocode1601 geocode8128 inst12761 journal16727 license21 method10527 method13926 method17189 method17212 method8919 method9823 param106858 param120585 param16065 param188251 param510226 param548539 param54969 param559988 param559989 param717 param7625 param763 param764 param770 param87094 param88084 pi82895 ref139384 refds983395 term1073089 term1073490 term1073493 term1073970 term1074403 term2299496 term2300861 term2606205 term2664259 term2687750 term38477 term38540 term40625 term40646 term40999 term43704 term43770 term43821 term43834 term43863 term43876 term43899 term43972 term43975 term44030 term44419 term47220 term49415 term50429 term50743 term67863 term69036 term69387 term73571 term74820 term76275 topotype11