Internal Tides Responsible for Lithogenic Inputs Along the Iberian Continental Slope

Barbot, Simon; Lagarde, Marion; Lyard, Florent; Marsaleix, Patrick; Lherminier, Pascale; Jeandel, Catherine

doi:10.1029/2022jc018816

Cited by 5 publications

(4 citation statements)

References 66 publications

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“…Margin sediments are thus likely a source of 227 Ac to the water column. In particular, station 1 is located on the Iberian margin; the high 227 Ac ex activity found at relatively shallow depth could result from a lateral input of 227 Ac released by the shallow sediments deposited onto the margin, a signal that is then be advected toward offshore waters, thus reaching station 13 and station 21 via different paths (Barbot et al, 2022). Near the Iberian margin (station 1), transmissiometry data indicate a shallow nepheloid layer (100-450 m; Fig.…”

Section: Ac Ex Activities Near the Seafloormentioning

confidence: 97%

“…4). Based on a semi-realistic 3D tidal model and considering the sediment properties, Barbot et al (2022) established that internal tides (ITs) generated in the Bay of Biscay and along the Iberian slope could facilitate sediment resuspension and could be the major mechanism for the resuspension happening below 300 m. As hypothesized for bottom waters, we cannot exclude that the shallow nepheloid layers impact the distribution of radionuclides such as Ra or 227 Ac (Fig. 4); in some cases, these nepheloid layers may act as a sink when particles scavenge chemical elements (e.g., radionuclides), while in other cases, they may act as a source when chemical elements are released from the particles.…”

Section: Ac Ex Activities Near the Seafloormentioning

confidence: 99%

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The distribution of 227Ac along the GA01 section in the North Atlantic

et al. 2023

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Section: Ac Ex Activities Near the Seafloormentioning

confidence: 97%

Section: Ac Ex Activities Near the Seafloormentioning

confidence: 99%

The distribution of 227Ac along the GA01 section in the North Atlantic

et al. 2023

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“…“Boundary Exchange” processes are likely more intense in the first 500 m along the margins than in the abysses. It is probable that, due to the dynamics of more violent surface currents and internal tides, greater fluxes of particles together with faster and more efficient exchange processes occur in the upper 500 m than at depth (Barbot et al., 2022). Thus, the occurrence of clouds of suspended particles created by currents and undersea storms may also generate exchanges in deep water.…”

Section: Environmental Distribution and Controlling Processes—element...mentioning

confidence: 99%

The Global Biogeochemical Cycle of the Rare Earth Elements

Hatje,

Schijf,

Johannesson

et al. 2024

Global Biogeochemical Cycles

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To improve our understanding and guide future studies and applications, we review the biogeochemistry of the rare earth elements (REE). The REEs, which form a chemically uniform group due to their nearly identical physicochemical properties, include the lanthanide series elements plus scandium (Sc) and yttrium (Y). These elements, in conjunction with the neodymium isotopes, are powerful tools for understanding key oceanic, terrestrial, biological and even anthropogenic processes. Furthermore, their unique properties render them essential for various technological processes and products. Here, we delve into the characteristics of REE biogeochemistry and discuss normalization procedures and REE anomalies. We also examine the aqueous speciation of REEs, contributing to a better understanding of their behavior in aquatic settings, including the role of neodymium isotopes. We then focus on their environmental distribution, fractionation, and controlling processes in different environmental systems across the land‐ocean continuum. In addition, we analyze sinks, sources, and the mobility of REEs, providing insights into their behavior in these environments. We further investigate the sources of anthropogenic REEs and their bioavailability, bioaccumulation, and transfer along food webs. We also explore the potential effects of climate change on the cycling, mobility and bioavailability of REEs, underlining the importance of current research in this evolving field. In summary, we provide a comprehensive review of REE behavior in the environment, from their properties and roles to their distribution and anthropogenic impacts, offering valuable insights and pinpointing key knowledge gaps.

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“…Furthermore, Gonzalez-Haro et al (2019) showed that barotropic and baroclinic tidal currents can induce temperature fluctuations by horizontal advection of surface water masses over hundreds of kilometers, and thus contribute to modifying the SST. These two tidal processes (barotropic and baroclinic) can also affect other tracers such as nutrients, chlorophyll and sediments (Heathershaw et al, 1987;da Silva et al, 2002;Sharples et al, 2007;Pomar et al, 2012;Muacho et al, 2014;Tuarena et al, 2016;Barbot et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Internal tides off the Amazon shelf Part I : importance for the structuring of ocean temperature during two contrasted seasons

Assene

Koch-Larrouy

Dadou

et al. 2023

Preprint

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Abstract. Tides and internal tides (IT) in the ocean can significantly affect local to regional ocean temperature, including sea surface temperature (SST), via physical processes such as diffusion (vertical mixing) and advection (vertical and horizontal) of water masses. Offshore of the Amazon River, strong IT have been detected by satellite observations and well modelled ; however, their impact on temperature, SST and the identification of the associated processes have not been studied so far. In this work, we use high resolution (1/36°) numerical simulations with and without the tides from an ocean circulation model (NEMO). This model explicitly resolves the internal tides (IT) and is therefore suitable to assess how they can affect ocean temperature in the studied area. We distinguish the analysis for two contrasted seasons, from April to June (AMJ) and from August to October (ASO), since the seasonal stratification off the Amazon River modulates the IT’s response and their influence in temperature. The generation and the propagation of the IT in the model are in good agreement with observations. The SST reproduced by the simulation including tides is in better agreement with satellite SST data compared to the simulation without tides. During ASO season, stronger meso-scale currents, deeper and weaker pycnocline are observed in contrast to the AMJ season. The observed coastal upwelling during ASO season is better reproduced by the model including tides, whereas the no-tide simulation is too warm by +0.3 °C for the SST. In the subsurface above the thermocline, the tide simulation is cooler by −1.2 °C, and warmer below the thermocline by +1.2 °C compared to the simulation without the tides. The IT induce vertical mixing on their generation site along the shelf break and on their propagation pathways towards the open ocean. This process mainly explains the cooler temperature at the ocean surface and is combined with vertical and horizontal advection to explain the cooling in the subsurface water above the thermocline and a warming in the deeper layers below the thermocline. The surface cooling induced in turn an increase of the net heat flux from the atmosphere to the ocean surface, which could induce significant changes in the local and even for the regional tropical Atlantic atmospheric circulation and precipitation. We therefore demonstrate that IT, via vertical mixing and advection along their propagation pathways, and tides over the continental shelf, can play a role on the temperature structure off the Amazon River mouth, particularly in the coastal cooling enhanced by the IT. Keywords: internal tides, Amazon continental shelf and slope, temperature, modeling, satellite data, mixing, heat flux.

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Internal Tides Responsible for Lithogenic Inputs Along the Iberian Continental Slope

Cited by 5 publications

References 66 publications

The distribution of 227Ac along the GA01 section in the North Atlantic

The distribution of 227Ac along the GA01 section in the North Atlantic

The Global Biogeochemical Cycle of the Rare Earth Elements

Internal tides off the Amazon shelf Part I : importance for the structuring of ocean temperature during two contrasted seasons

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