The evolution of 17O-excess in surface water of the arid environment during recharge and evaporation

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Title:Main Title: The evolution of 17O-excess in surface water of the arid environment during recharge and evaporation
Description:Abstract: This study demonstrates the potential of triple O-isotopes to quantify evaporation with recharge on a salt lake from the Atacama Desert, Chile. An evaporative gradient was found in shallow ponds along a subsurface flow-path from a groundwater source. Total dissolved solids (TDS) increased by 177 g/l along with an increase in δ18O by 16.2‰ and in δD by 65‰. 17O-excess decreased by 79 per meg, d-excess by 55‰. Relative humidity (h), evaporation over inflow (E/I), the isotopic composition of vapor (*RV) and of inflowing water (*RWI) determine the isotope distribution in 17O-excess over δ18O along a well-defined evaporation curve as the classic Craig-Gordon model predicts. A complementary on-site simple (pan) evaporation experiment over a change in TDS, δ18O, and 17O-excess by 392 g/l, 25.0‰, and −130 per meg, respectively, was used to determine the effects of sluggish brine evaporation and of wind turbulence. These effects translate to uncertainty in E/I rather than h. The local composition of *RV relative to *RWI pre-determines the general ability to resolve changes in h. The triple O-isotope system is useful for quantitative hydrological balancing of lakes and for paleo-humidity reconstruction, particularly if complemented by D/H analysis.
Identifier:10.1038/s41598-018-23151-6 (DOI)
Responsible Party
Creators:Jakub Surma (Author), Sergey Assonov (Author), Daniel Herwartz (Author), Claudia Voigt (Author), Michael Staubwasser (Author)
Publisher:Springer Nature
Publication Year:2018
CRC1211 Topic:Climate
Related Subproject:D3
Subjects:Keywords: Stable Isotope Geochemistry, Paleoclimate Proxies
Geogr. Information Topic:Inland Waters
File Details
Data Type:Text - Article
File Size:1.5 MB
Date:Issued: 21.03.2018
Mime Type:application/pdf
Data Format:PDF
Download Permission:Only Project Members
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:[CRC1211DB] Data policy agreement
Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Scientific Reports
Number of Pages:10 (1 - 10)
Metadata Details
Metadata Creator:Claudia Voigt
Metadata Created:29.03.2018
Metadata Last Updated:29.03.2018
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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