Triple isotopes (δD, δ18O, δ17O) characteristic of river water and groundwater in an arid watershed from Qaidam Basin, Northwestern China: implications for hydrological cycle
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View abstract on PubMed
Summary
This summary is machine-generated.Triple oxygen isotopes (δ<sup>17</sup>O) help trace water origins and evaporation in the Golmud River basin. River water and groundwater originate from mountain precipitation, with meltwater also contributing during floods.
Area Of Science
- Hydrology
- Isotope Geochemistry
Background
- Stable isotopes (δD, δ<sup>18</sup>O) and triple oxygen isotopes (δ<sup>17</sup>O) are crucial for tracing hydrological processes.
- Current research on triple oxygen isotopes is limited to precipitation, neglecting river and groundwater systems.
Purpose Of The Study
- Investigate spatial variations of δD, δ<sup>18</sup>O, δ<sup>17</sup>O, d-excess, and <sup>17</sup>O-excess in Golmud River basin's river water and groundwater.
- Determine water origins and assess evaporation impacts on these water bodies during flood season.
Main Methods
- Analysis of stable isotopes (δD, δ<sup>18</sup>O) and triple oxygen isotopes (δ<sup>17</sup>O).
- Calculation of d-excess and <sup>17</sup>O-excess.
- Spatial variation analysis and correlation studies.
Main Results
- River water and groundwater originate from mountainous precipitation, with meltwater contributing during floods.
- Spatial patterns of δD, δ<sup>18</sup>O, and δ<sup>17</sup>O show decrease-increase-stability, contrasting with d-excess trends.
- <sup>17</sup>O-excess is elevated in source and downstream regions, indicating mixed influences.
Conclusions
- River water and groundwater originate from precipitation, with meltwater input in the source region.
- Evaporation and tributary mixing significantly affect river water, as shown by d-excess and <sup>17</sup>O-excess.
- A conceptual model illustrates mountain recharge, upstream evaporation, midstream leakage to groundwater, and downstream re-evaporation.
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