Description: This dataset contains dissolved oxygen (DO) concentrations, stable oxygen isotope ratios of DO (δ¹⁸ODO), particulate organic carbon (POC) concentrations, and respiration/photosynthesis (R/P) ratios, along with corresponding parameters (temperature, δ¹⁸OH2O, nitrate) 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). δ¹⁸ODO was analyzed using a modified automated equilibration system (Gasbench II, ThermoFisher Scientific™) coupled to a DELTA V Advantage isotope ratio mass spectrometer (IRMS, ThermoFisher Scientific™). This dataset captures seasonal variations in DO dynamics and provides valuable insights into oxygen sources and sinks within the Danube River. The data support the study of biogeochemical cycling in large river systems and can inform ecosystem management and conservation strategies in the face of environmental and climate change.
Global identifier:
Doi(
"10.1594/PANGAEA.983395",
)
DataMeasurements(
DataMeasurements {
domain: Unspecified,
station: None,
measured_variables: [
"Carbon, organic, particulate",
"DATE/TIME",
"ELEVATION",
"LATITUDE",
"LONGITUDE",
"Nitrate",
"Oxygen",
"Oxygen, dissolved",
"Production/respiration ratio",
"Respiration/net photosynthesis ratio",
"River",
"River kilometer",
"Sample ID",
"Season",
"Temperature, water",
"δ Deuterium, water",
"δ18O, dissolved oxygen",
"δ18O, water",
],
methods: [
"Element analyser, Costech Analytical Technologies, ECS 4010 CHNS-O",
"Isotope-Ratio Mass spectrometry (IRMS), ThermoFisher Scientific, Delta V Advantage with GasBench II carbonate preparation device",
"Isotopic Water Liquid Analyzer, Picarro, L1102-i",
"Mobile elevation application, Mapnitude Co., Ltd., Elevation",
"Portable 2-channel multimeter, Hach, HQ40D",
],
},
)
Tags: Tierhaltungsanlage ? Nitrat ? Fluss ? Kohlenstoff ? Wassertemperatur ? USA ? Geografische Koordinaten ? Temperatur ? Schiff ? Studie ? Wasserprobe ? Daten ? Klimawandel ? Ökosystem ? Wasserstand ? Danube River ? dissolved oxygen (DO) ? particulate organic carbon (POC) ? respiration/photosynthesis (R/P) ratios ? stable oxygen isotope ratios (δ¹⁸ODO) ?
Bounding boxes: 8.154897° .. 29.344149° x 43.621077° .. 49.025942°
License: cc-by/4.0
Language: Englisch/English
Issued: 2025-07-03
Modified: 2025-09-12
Time ranges: 2023-07-07 - 2024-09-04
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