Reconstruction of Dead Sea lake level and mass balance back to 237 ka BP using halite fluid inclusions

Emmanuel Guillerm, Véronique Gardien, Nicolas D. Waldmann, Niels S. Brall, Daniel Ariztegui, Markus J. Schwab, Ina Neugebauer, Adeline Lach, Frédéric Caupin

Research output: Contribution to journalArticlepeer-review

Abstract

The lake level of the Dead Sea, Southern Levant, has fluctuated with an amplitude of ∼250 m in response to the last glacial-interglacial cycle. This exceptional sensitivity to climate change, and the availability of long sedimentary archives, make the Dead Sea a benchmark for long quantitative paleohydrological reconstructions. However, discontinuities and chronological uncertainties in the marginal sedimentary record have hampered the reconstruction of Dead Sea lake levels beyond the Last Glacial (70–14 ka before present, BP). Here, we apply a two-pronged methodology. First, we measure the lake water density along ICDP deep core 5017-1-A using a new method, Brillouin spectroscopy on two-phase halite fluid inclusions; we combine it with the composition of pore water and the thickness of halite layers in the core to reconstruct lake level, volume, mass balance and subsidence rate. Second, we tune the chronology of lake levels from outcrops by matching it to the chronology of the deep core. The resulting lake level reconstruction, spanning 237–70 ka BP, is validated by the excellent agreement between outcrop- and mass balance-based methodologies. It shows a long-term recession of the lake, its level decreasing from one interglacial to the other, down to a Holocene record low. There are two reasons for this lake level fall. First, with an average rate of 2.65 ± 0.15 m/ka, subsidence has outpaced sedimentation at least over the last ∼130 ka. Second, by reducing the solute inventory of the lake, massive halite precipitation events such as that of 131–116 ka BP have durably increased surface water activity and evaporation, and thus lowered the lake level, up to today. Conversely, our analysis suggests that, during 191–11 ka BP, the dissolution of Mount Sedom salt diapir and freshwater inflows provided to the lake about three times the mass of solute NaCl contained in the modern Dead Sea (in 1985). This massive solute influx, occurring mainly during glacial highstands, strongly contributed to lowering surface water activity and evaporation and, therefore, to increasing the lake volume. Our results suggest that Dead Sea lake levels are more accurately interpreted in terms of climatic change if surface water activity is taken into account.

Original languageEnglish
Article number107964
JournalQuaternary Science Reviews
Volume303
DOIs
StatePublished - 1 Mar 2023

Bibliographical note

Funding Information:
We thank J. K. Hall for providing the 20 m-spaced contours of the DSB from −720 to −420 m asl; E. Levy for providing the ICDP core pore water data; A. Torfstein for providing the Dead Sea/Lisan lake level curves and the synthetic lake level curve; Brian Brademann (GFZ) for help with technical issues to saw the salt cores; and Leonard Bender for help with sampling issues. We thank three anonymous reviewers for their constructive comments and the editor for the efficient handling of the editorial process. The authors thank ICDP for providing access to halite samples from core 5017-1-A. This study is a contribution to the project ‘PALEX: Paleohydrology and Extreme Floods from the Dead Sea ICDP core’ (DFG grant # BR2208/13–1/-2). This work was performed within the framework of the EUR H2O'Lyon (ANR-17-EURE-0018) of Université de Lyon (UdL), within the program “Investissements d'Avenir” operated by the French National Research Agency (ANR). It was supported by the project ARC 3 Environnement of the Région Rhône-Alpes through a 3-year PhD scholarship to EG for the period 2015–2018 (grant # 15-008302-01). EG is grateful to the Azrieli Foundation for the award of an Azrieli Fellowship.

Funding Information:
We thank J. K. Hall for providing the 20 m-spaced contours of the DSB from −720 to −420 m asl; E. Levy for providing the ICDP core pore water data; A. Torfstein for providing the Dead Sea/Lisan lake level curves and the synthetic lake level curve; Brian Brademann (GFZ) for help with technical issues to saw the salt cores; and Leonard Bender for help with sampling issues. We thank three anonymous reviewers for their constructive comments and the editor for the efficient handling of the editorial process. The authors thank ICDP for providing access to halite samples from core 5017-1-A. This study is a contribution to the project ‘PALEX: Paleohydrology and Extreme Floods from the Dead Sea ICDP core’ ( DFG grant # BR2208/13–1/-2 ). This work was performed within the framework of the EUR H2O’Lyon (ANR-17-EURE-0018) of Université de Lyon (UdL), within the program “Investissements d’Avenir” operated by the French National Research Agency (ANR) . It was supported by the project ARC 3 Environnement of the Région Rhône-Alpes through a 3-year PhD scholarship to EG for the period 2015–2018 (grant # 15-008302-01). EG is grateful to the Azrieli Foundation for the award of an Azrieli Fellowship.

Publisher Copyright:
© 2023 Elsevier Ltd

Keywords

  • Dead Sea
  • Eastern Mediterranean
  • Fluid inclusions
  • Halite
  • Lake level
  • Late Quaternary
  • Paleolimnology
  • Subsidence

ASJC Scopus subject areas

  • Global and Planetary Change
  • Ecology, Evolution, Behavior and Systematics
  • Archaeology
  • Archaeology
  • Geology

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