A 45 kyr laminae record from the Dead Sea: Implications for basin erosion and floods recurrence
Recording and analyzing how climate change impacts flood recurrence, basin erosion, and sedimentation can improve our understanding of these systems. The aragonite-detritus laminae couplets comprising the lacustrine formations that were deposited in the Dead Sea are considered as faithful monitors o...
Gespeichert in:
| 1. Verfasser: | |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
5 January 2020
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| In: |
Quaternary science reviews
Year: 2020, Jahrgang: 229 |
| ISSN: | 0277-3791 |
| DOI: | 10.1016/j.quascirev.2019.106143 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.quascirev.2019.106143 Verlag, lizenzpflichtig, Volltext: http://www.sciencedirect.com/science/article/pii/S0277379118306590 
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| Verfasserangaben: | Yin Lu, Revital Bookman, Nicolas Waldmann, Shmuel Marco |
MARC
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| 245 | 1 | 2 | |a A 45 kyr laminae record from the Dead Sea |b Implications for basin erosion and floods recurrence |c Yin Lu, Revital Bookman, Nicolas Waldmann, Shmuel Marco |
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| 520 | |a Recording and analyzing how climate change impacts flood recurrence, basin erosion, and sedimentation can improve our understanding of these systems. The aragonite-detritus laminae couplets comprising the lacustrine formations that were deposited in the Dead Sea are considered as faithful monitors of the freshwater supply to the lakes. We count a total of ∼5600 laminae couplets deposited in the last 45 kyr (MIS3-MIS1) at the Dead Sea center, which encompass the upper 142 m of the ICDP Core 5017-1. The present study shows that aragonite and detritus laminae are thinner and occur at high frequency during MIS 3-2, while they are much thicker and less frequent during MIS 1. By analyzing multiple climate-connected factors, we propose that significant lake-level drops, enhanced dust input, and low vegetative cover in the drainage basin during the last deglaciation (22-11.6 ka) have considerably increased erodible materials in the Dead Sea watershed. We find a decoupling existed between the significant lake-level drop/lake size reduction and lamina thickness change during the last deglaciation. We argue that during the Last Glacial and the Holocene, the variation of lamina thickness at the multiple-millennium scale was not controlled directly by the lake-level/size change. We interpret this decoupling implying the transport capacity of flash-floods is low and might be saturated by the oversupply of erodible materials, and indicating a transport-limited regime during the time period. We suggest the observed thickness and frequency distribution of aragonite-detritus laminae points to the high frequency of small-magnitude floods during the Last Glacial, in contrast to low frequency, but large-magnitude floods during the Holocene. | ||
| 650 | 4 | |a Aragonite-detritus laminae | |
| 650 | 4 | |a Basin erosion | |
| 650 | 4 | |a Climate change | |
| 650 | 4 | |a Dead Sea | |
| 650 | 4 | |a Flash-floods | |
| 650 | 4 | |a Magnitude-frequency | |
| 650 | 4 | |a Paleolimnology | |
| 650 | 4 | |a Transport-limited regime | |
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