Global Stable Isotope Dataset for Surface Water
Description
The Dataset consists of three main elements: website data (GNIR data, http://nucleus.iaea.org/wiser/explore, water isotopes website, http://wateriso.utah.edu/waterisotopes), measured data and references data. The dataset encompasses 22389 surface water sampling sites across seven continents. Since 2015, an ecohydrological observation system has been implemented in the Shiyang River Basin in the arid zone of Northwest China to systematically gather surface water stable isotope data, serving as the primary source of measured data. The improvements in isotopic data v1.1 are mainly to remove some duplicates and incorrect data.
Files
Steps to reproduce
Before the experiment, samples were removed from the refrigerator and allowed to melt at room temperature. Once melted, they were transferred to standard 1.5 mL glass sample bottles. A 0.45 μm filter was used to remove contaminants such as silt and dust. Stable isotope values were analyzed using a liquid water isotope analyzer (DLT-100, Los Gatos Research, USA). Each water sample was measured six times, discarding the first two measurements to avoid residual contamination, and the stable isotope value was calculated as the average of the last four measurements. To ensure data accuracy, we used LIMA to validate the raw data. Only data that passed the software test were included; otherwise, the analysis was repeated. Additionally, all isotope data were reviewed to ensure clear "longitude," "latitude," "sampling time," and "isotope" information. Outliers and duplicates were removed.