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Powerful turbidity currents driven by dense basal layers

Paull, Charles K.; Talling, Peter J.; Maier, Katherine L.; Parsons, Daniel; Xu, Jingping; Caress, David W.; Gwiazda, Roberto; Lundsten, Eve M.; Anderson, Krystle; Barry, James P.; Chaffey, Mark; O’Reilly, Tom; Rosenberger, Kurt J.; Gales, Jenny A.; Kieft, Brian; McGann, Mary; Simmons, Steve M.; McCann, Mike; Sumner, Esther J.; Clare, Michael A.; Cartigny, Matthieu J.

Authors

Charles K. Paull

Peter J. Talling

Katherine L. Maier

Jingping Xu

David W. Caress

Roberto Gwiazda

Eve M. Lundsten

Krystle Anderson

James P. Barry

Mark Chaffey

Tom O’Reilly

Kurt J. Rosenberger

Jenny A. Gales

Brian Kieft

Mary McGann

Mike McCann

Esther J. Sumner

Michael A. Clare

Matthieu J. Cartigny

Abstract

Seafloor sediment flows (turbidity currents) are among the volumetrically most important yet least documented sediment transport processes on Earth. A scarcity of direct observations means that basic characteristics, such as whether flows are entirely dilute or driven by a dense basal layer, remain equivocal. Here we present the most detailed direct observations yet from oceanic turbidity currents. These powerful events in Monterey Canyon have frontal speeds of up to 7.2 m s−1, and carry heavy (800 kg) objects at speeds of ≥4 m s−1. We infer they consist of fast and dense near-bed layers, caused by remobilization of the seafloor, overlain by dilute clouds that outrun the dense layer. Seabed remobilization probably results from disturbance and liquefaction of loose-packed canyon-floor sand. Surprisingly, not all flows correlate with major perturbations such as storms, floods or earthquakes. We therefore provide a new view of sediment transport through submarine canyons into the deep-sea.

Journal Article Type Article
Publication Date Dec 1, 2018
Electronic ISSN 2041-1723
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 9
Issue 1
Article Number 4114
Institution Citation Paull, C. K., Talling, P. J., Maier, K. L., Parsons, D., Xu, J., Caress, D. W., …Cartigny, M. J. (2018). Powerful turbidity currents driven by dense basal layers. Nature communications, 9(1), https://doi.org/10.1038/s41467-018-06254-6
DOI https://doi.org/10.1038/s41467-018-06254-6
Keywords General Biochemistry, Genetics and Molecular Biology; General Physics and Astronomy; General Chemistry
Publisher URL https://www.nature.com/articles/s41467-018-06254-6

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