Stable isotopes in global lakes integrate catchment and climatic controls on evaporation

Yuliya Vystavna (), Astrid Harjung, Lucilena R. Monteiro, Ioannis Matiatos and Leonard I. Wassenaar
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Yuliya Vystavna: Vienna International Centre
Astrid Harjung: Vienna International Centre
Lucilena R. Monteiro: Vienna International Centre
Ioannis Matiatos: Vienna International Centre
Leonard I. Wassenaar: Vienna International Centre

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Global warming is considered a major threat to Earth’s lakes water budgets and quality. However, flow regulation, over-exploitation, lack of hydrological data, and disparate evaluation methods hamper comparative global estimates of lake vulnerability to evaporation. We have analyzed the stable isotope composition of 1257 global lakes and we find that most lakes depend on precipitation and groundwater recharge subsequently altered by catchment and lake evaporation processes. Isotope mass-balance modeling shows that ca. 20% of water inflow in global lakes is lost through evaporation and ca. 10% of lakes in arid and temperate zones experience extreme evaporative losses >40 % of the total inflow. Precipitation amount, limnicity, wind speed, relative humidity, and solar radiation are predominant controls on lake isotope composition and evaporation, regardless of the climatic zone. The promotion of systematic global isotopic monitoring of Earth’s lakes provides a direct and comparative approach to detect the impacts of climatic and catchment-scale changes on water-balance and evaporation trends.

Date: 2021
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DOI: 10.1038/s41467-021-27569-x

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