Linking Hydrological Exchange and DOM Transformation in a Semi-Arid River: Insights from Isotopic and Fluorescent Fingerprinting

This dataset contains the hydrogen and oxygen isotopic measurements of 28 water samples collected from the Bahe River during the wet season. The data are provided in Excel format and include the sample ID, water type (surface water, groundwater, or spring water), and corresponding δ¹⁸O and δ²H values. After collection, water samples were filtered through 0.22 μm membranes and stored in 2 mL glass vials, ensuring bubble-free sealing. All samples were delivered to the laboratory within one week of collection and analyzed using a L2130-i water isotope analyzer. The measurement accuracy of the instrument is ±0.010‰ for δ¹⁸O and ±0.05‰ for δ²H. Each analysis was calibrated using the international standard reference material VSMOW to ensure data accuracy and comparability.
This dataset can be used to analyze the δ¹⁸O-δ²H relationship, assess sample positions relative to the Local Meteoric Water Line (LMWL), evaluate evaporation intensity, and identify mixing proportions of water from different sources.