Triple oxygen isotope systematics of evaporation and mixing processes in a dynamic desert lake system

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*Title:*	Main Title: Triple oxygen isotope systematics of evaporation and mixing processes in a dynamic desert lake system
*Description:*	Abstract: Triple oxygen isotope measurements are a novel and promising tool in geochemical and hydrological research. This study investigates the combined hydrogen-deuterium and triple oxygen isotope hydrology at the Salar del Huasco, a highly dynamic salt lake system located on the Altiplano Plateau, N-Chile. The region has a semiarid climate that shows strong seasonal and diurnal variability in relative humidity, temperature, and wind conditions. The Salar del Huasco receives inflow from multiple surface sources and groundwater. Episodic flooding after rare rainfall events imposes seasonal fluctuations of the groundwater table and, thus, the lake level. Applying the Craig and Gordon (C-G) evaporation model for triple oxygen isotope data measured along series of increasingly evaporated lakes and ponds within the salar demonstrates the capability to resolve the individual fundamental hydrologic processes of recharge evaporation, simple (pan) evaporation, and transient mixing with surface and subsurface floodwater. Regarding the stream and spring sources, mixing of different generations of recharge is clearly distinguishable from pre-evaporation of a single recharge event. These processes are not resolvable by δ2H and δ18O measurements alone. We also show that accurate monitoring of the isotopic composition of ambient water vapour and an estimate of the wind turbulence coefficient in the C-G model are critical aspects required to quantify the hydrologic balance. The wind turbulence coefficient, here 0.54, may be determined accurately from on-site evaporation experiments by fitting evaporation trajectories to the d-excess, δ18O and residual fraction data.
*Identifier:*	https://doi.org/10.5194/hess-2020-255 (DOI)

Responsible Party

*Creators:*	Claudia Voigt (Author), Daniel Herwartz (Author), Cristina Dorador (Author), Michael Staubwasser (Author)
*Funding Reference:*	Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit
*Publisher:*	Copernicus Publications
*Publication Year:*	2020

Topic

*CRC1211 Topic:*	Climate
*Related Subproject:*	D3
*Subjects:*	Keywords: Stable Isotope Geochemistry, Paleoclimate Proxies
*Geogr. Information Topic:*	Environment

File Details

*Filename:*	Voigt_et_al_2020_HESS_Discuss.pdf
*Data Type:*	Text - Article
*File Size:*	4.1 MB
*Date:*	Available: 15.06.2020
*Mime Type:*	application/pdf
*Data Format:*	PDF
*Language:*	English
*Status:*	Completed

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*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:*	[Creative Commons] Attribution 4.0 International (CC BY 4.0)

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Specific Information - Publication

*Publication Status:*	Submitted
*Review Status:*	Not peer reviewed
*Publication Type:*	Article
*Article Type:*	Journal
*Source:*	Hydrology and Earth System Sciences
*Source Website:*	https://www.hydrology-and-earth-system-sciences.net/index.html
*Number of Pages:*	26 (1 - 26)

Metadata Details

*Metadata Creator:*	Claudia Voigt
*Metadata Created:*	16.06.2020
*Metadata Last Updated:*	16.06.2020
*Subproject:*	D3
*Funding Phase:*	1
*Metadata Language:*	English
*Metadata Version:*	V50

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