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

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 exceptionally deep cores covering up to 426,000 years in the Tore seamounts area. Here we evaluate the possible role of a number of physical processes that, when combined, may induce sufficiently intense bottom boundary events and likely precondition the recurrence pattern of the observed deep ocean turbidites.

Keywords

Oceanography Internal Waves Sea level Circulation Deep ocean Topography

URI

http://hdl.handle.net/10400.9/6050

Citation

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: XIII Congreso de la Asociación Española de Climatologia, San Lorenzo de El Escorial (Madrid), Spain, 22-24 janeiro, 2025