Abstract
Tap water isotopic compositions could potentially record information on local climate and water management practices. A new water isotope tracer 17O-excess became available in recent years providing additional information of the various hydrological processes. Detailed data records of tap water 17O-excess have not been reported. In this report, monthly tap water samples (n = 652) were collected from December 2014 to November 2015 from 92 collection sites across China. The isotopic composition (δ2H, δ18O, and δ17O) of tap water was analyzed by a Triple Water Vapor Isotope Analyzer (T-WVIA) based on Off-Axis Integrated Cavity Output Spectroscopy (OA-ICOS) technique and two second-order isotopic variables (d-excess and 17O-excess) were calculated. The geographic location information of the 92 collection sites including latitude, longitude, and elevation were also provided in this dataset. This report presents national-scale tap water isotope dataset at monthly time scale. Researchers and water resource managers who focus on the tap water issues could use them to probe the water source and water management strategies at large spatial scales.
Highlights
Background & SummaryStable isotopes of hydrogen and oxygen have been widely used to identify plant water uptake depths, partition evapotranspiration, and separate hydrographs[1,2,3,4,5,6,7]
The studies of water 17O-excess variations at large spatiotemporal distribution have mainly focused on snow and ice cores in high-latitude regions[29,30,31,32,33,34,35,36], where 17O-excess of snow is sensitive to temperature because of kinetic fractionation associated with supersaturation conditions under extremely cold condition (−80 to −15 °C)[29,31,32]
We present the first publicly available monthly tap water isotope dataset to fill the gap in global tap water isotope datasets, especially for 17O-excess, which would be used to study water resource issues in the sustainable development of human societies
Summary
Background & SummaryStable isotopes of hydrogen and oxygen have been widely used to identify plant water uptake depths, partition evapotranspiration, and separate hydrographs[1,2,3,4,5,6,7]. The studies of water 17O-excess variations at large spatiotemporal distribution have mainly focused on snow and ice cores in high-latitude regions[29,30,31,32,33,34,35,36], where 17O-excess of snow is sensitive to temperature because of kinetic fractionation associated with supersaturation conditions under extremely cold condition (−80 to −15 °C)[29,31,32]. There is no monthly tap water isotope dataset including 17O-excess publicly available.
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