Evaluating the role of physical mechanisms as possible triggers for turbidity currents in a deep ocean seamount

ABSTRACT: Turbidity currents on continental margins are often attributed to cyclic climate variability and sea-level change, while the causes of deep ocean turbidites are as yet to be tested. The Atlantic Iberian margin provides a unique setting to contrast deep ocean and continental environments, including depression features that further protect from resuspension and erosion by along-slope bottom currents. We present records of low-frequency, non-periodic, climate-independent turbidites from three deep cores covering up to 426,000 years in the Tore seamounts area. By evaluating a range of physical oceanographic mechanisms, the breaking of internal waves and mesoscale Mediterranean-eddies against unstable slopes in the seamounts area arises as the most likely triggers that precondition the recurrence pattern of the observed deep ocean turbidites.

Palavras-chave

Oceanography Internal Waves Sea level Circulation Deep ocean Topography

URI

http://hdl.handle.net/10400.9/6049

Citação

Lebreiro, S.M., Peliz, A., Anton, L., Nave, S., Reguera, M.I., Lozano-Luz, R., Waelbroeck, C., Crowhurst, S., Martrat, B., Lopez, J.F., Hebert, R. & Lopez-Rodriguez, A. (2025). Evaluating the role of physical mechanisms as possible triggers for turbidity currents in a deep ocean seamount. In: Deep Sea Research Part I: Oceanographic Research Papers, 2025, vol. 224, article 104557. https://doi.org/10.1016/j.dsr.2025.104557

Editora

Elsevier

DOI

10.1016/j.dsr.2025.104557

Coleções

GCG - Artigos em revistas internacionais

Licença CC

cclicense-by-nc-nd

Métricas Alternativas

Ver registo completo