Hydroclimatic Controls on Salt Fluxes and Halite Deposition in the Dead Sea and the Shaping of “Salt Giants”

Ido Sirota, Raphael Ouillon, Ziv Mor, Eckart Meiburg, Yehouda Enzel, Ali Arnon, Nadav G. Lensky*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

As the only deep hypersaline, halite-precipitating lake on Earth today, the Dead Sea is the single modern analog for investigating the mechanisms by which large-scale and thick salt deposits, known as “salt giants”, have accreted in the geological record. We directly measure the hydroclimatic forcing and the physical limnologic processes leading to halite sedimentation, the vertical thermohaline structure, and salt fluxes in the Dead Sea. We demonstrate that changes in these forcing lead to strong seasonal and regional variations in the stratification stability ratio, triggering corresponding spatiotemporal variations in thermohaline staircase formation and diapycnal salt flux, and finally control the thickness of the halite layer deposited. The observed staircase formation is consistent with the mean-field γ instability, causing layering in double-diffusive convection. We show that double diffusion and thermohaline staircase formation drive the spatial variability of halite deposition in hypersaline water bodies, underlying and shaping “salt giants” basin architecture.

Original languageAmerican English
Article numbere2020GL090836
JournalGeophysical Research Letters
Volume47
Issue number22
DOIs
StatePublished - 28 Nov 2020

Bibliographical note

Publisher Copyright:
©2020. American Geophysical Union. All Rights Reserved.

Keywords

  • Dead Sea
  • double diffusion
  • halite
  • hydroclimate
  • salt giants
  • thermohaline staircases

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