Internal tides responsible for lithogenic inputs along the Iberian continental slope

Type Article
Date 2021-01
Language English
Author(s) Barbot Simon1, Lagarde MarionORCID1, Lyard Florent HenriORCID1, Marsaleix PatrickORCID1, Lherminier PascaleORCID2, Jeandel CatherineORCID1
Affiliation(s) 1 : LEGOS, Universite de Toulouse, CNES, CNRS, IRD, UPS, Toulouse, France
2 : LOPS, Universite de Brest, CNRS, IRD, Ifremer, IUEM, Plouzane, France
Source under consideration at Journal of Geophysical Research - Oceans (2169-9291) (Wiley/ESSOAR), 2021-01 , P. 24p.
DOI 10.1002/essoar.10507679.1
Abstract

This study details the sediment resuspension due to internal tides (ITs) and the afterward propagation of suspended particles along and off the Iberian continental slope. Five resuspension sites are precisely identified along the western Iberian shelf slope using a tidal regional model of Bay of Biscay and Iberian continental shelf. Two sites are sources of lithogenic material only, one of biogenic matter only and two are sources of a mixture of both. The potential pathways for particles from the resuspension sites toward the GEOVIDE stations are identified using the IBIRYS reanalysis to infer their transport by the ocean circulation. It appears that each station is influenced by a specific pathway and mixed particles from different resuspension sites. This methodology enables to establish more realistic interpretations of the geochemical in situ observations combining distinct modeling of ITs and oceanic circulation as well as in situ sediment properties. It also reveals that the criticality of the bathymetry slope, commonly used to trigger the potential occurrence of ITs, is not sufficient to investigate their role in sediment resuspension. An explicit resolution of the ITs using a numerical tidal model is required to identify more exhaustively all the actual resuspension sites.

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Barbot Simon, Lagarde Marion, Lyard Florent Henri, Marsaleix Patrick, Lherminier Pascale, Jeandel Catherine (2021). Internal tides responsible for lithogenic inputs along the Iberian continental slope. under consideration at Journal of Geophysical Research - Oceans, 24p. Publisher's official version : https://doi.org/10.1002/essoar.10507679.1 , Open Access version : https://archimer.ifremer.fr/doc/00719/83061/