Citation:

PANGAEA.993653 (DOI registration in progress)

Name: Seasonal Dataset of DIC, δ13CDIC, DOC, δ13CDOC, pCO2(aq), FCO2 and Biogeochemical Parameters in the Danube River (2023–2024)
Published: 2026-04-27
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Carbon cycling; CO2 fluxes; Danube River; dissolved in organic carbon (DIC); dissolved organic carbon (DOC); fCO2; isotope analysis; pCO2; seasonal fluctuations; tributary; weathering

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Published: 2026-04-27

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Abstract:

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.

Keyword(s):

Carbon cycling; CO2 fluxes; Danube River; dissolved in organic carbon (DIC); dissolved organic carbon (DOC); fCO2; isotope analysis; pCO2; seasonal fluctuations; tributary; weathering

Supplement to:

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

Related to:

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

Funding:

Horizon Europe (HorizonEU), grant/award no. 101094070 : DALIA - Danube Region Water Lighthouse Action

Coverage:

Median Latitude: 46.496111 * Median Longitude: 18.675788 * South-bound Latitude: 43.621077 * West-bound Longitude: 8.154897 * North-bound Latitude: 49.025942 * East-bound Longitude: 29.344149

Date/Time Start: 2023-07-07T00:00:00 * Date/Time End: 2024-09-04T00:00:00

Minimum Elevation: -1.0 m * Maximum Elevation: -1.0 m

Event(s):

DALIA * Latitude Start: 48.095297 * Longitude Start: 8.154897 * Latitude End: 45.172488 * Longitude End: 29.344149 * Elevation Start: -1.0 m * Elevation End: -1.0 m * Method/Device: Water sampler

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Season	Season		Maier, Jan		of sampling
2	Sample ID	Sample ID		Maier, Jan
3	DATE/TIME	Date/Time		Maier, Jan		Geocode
4	LATITUDE	Latitude		Maier, Jan		Geocode
5	LONGITUDE	Longitude		Maier, Jan		Geocode
6	River	River		Maier, Jan
7	River kilometer	River km	km	Maier, Jan		upstream
8	Temperature, water	Temp	°C	Maier, Jan	Portable 2-channel multimeter, Hach, HQ40D
9	pH	pH		Maier, Jan	Portable 2-channel multimeter, Hach, HQ40D
10	Carbon, inorganic, dissolved	DIC	mmol/l	Maier, Jan	TIC–TOC analyzer, OI Analytical, Aurora 1030W
11	δ13C, dissolved inorganic carbon	δ13C DIC	‰ PDB	Maier, Jan	TIC–TOC analyzer, OI Analytical, Aurora 1030W	vs. VPDB
12	Carbon, organic, dissolved	DOC	mmol/l	Maier, Jan	TIC–TOC analyzer, OI Analytical, Aurora 1030W
13	δ13C, dissolved organic carbon	δ13C DOC	‰ PDB	Maier, Jan	TIC–TOC analyzer, OI Analytical, Aurora 1030W	vs. VPDB
14	Carbon dioxide, partial pressure	pCO2	µatm	Maier, Jan	PHREEQC modeling
15	Transfer velocity, scaled	k600	m/d	Maier, Jan		gas transfer velocity
16	Surface area	Surface	m²	Maier, Jan
17	Carbon dioxide, emission rate	CO2 ER	g/d	Maier, Jan
18	Bicarbonate	[HCO3]-	mmol/l	Maier, Jan	Acid titration, 0.16N H2SO4
19	Calcium ion	Ca2+	mmol/l	Maier, Jan	Inductively Coupled Plasma Mass Spectrometry, Thermo Fisher Scientific, iCap Q ICP-MS

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

5554 data points

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