Glider and satellite monitoring of the variability of the suspended particle distribution and size in the Rhône ROFI

Many, Gaël; Bourrin, François; Madron, Xavier Durrieu de; Ody, A.; Doxaran, David; Cauchy, Pierre

doi:10.1016/j.pocean.2017.05.006

Cited by 21 publications

(15 citation statements)

References 57 publications

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“…We compared satellite images of surface SPM concentrations with those observed by the glider close to the surface in order to assess their complementarity in terms of monitoring turbidity in the Rhone's ROFI. The relationship between SPM derived from glider/MODIS measurements can be expressed as SPM MODIS = 2.6 × SPM Glider , with a coefficient of determination of 0.87, which is very similar to observations already made in this area [61].…”

Section: Spm Dynamics From Glider Vs Satellite Observationssupporting

confidence: 79%

Glider-Based Active Acoustic Monitoring of Currents and Turbidity in the Coastal Zone

et al. 2020

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The recent integration of Acoustic Doppler Current Profilers (ADCPs) onto underwater gliders changes the way current and sediment dynamics in the coastal zone can be monitored. Their endurance and ability to measure in all weather conditions increases the probability of capturing sporadic meteorological events, such as storms and floods, which are key elements of sediment dynamics. We used a Slocum glider equipped with a CTD (Conductivity, Temperature, Depth), an optical payload, and an RDI 600 kHz phased array ADCP. Two deployments were carried out during two contrasting periods of the year in the Rhone River region of freshwater influence (ROFI). Coastal absolute currents were reconstructed using the shear method and bottom tracking measurements, and generally appear to be in geostrophic balance. The responses of the acoustic backscatter index and optical turbidity signals appear to be linked to changes of the particle size distribution in the water column. Significantly, this study shows the interest of using a glider-ADCP for coastal zone monitoring. However, the comparison between suspended particulate matter dynamics from satellites and gliders also suggests that a synoptic view of the processes involved requires a multiplatform approach, especially in systems with high spatial and temporal variability, such as the Rhone ROFI area.

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Section: Spm Dynamics From Glider Vs Satellite Observationssupporting

confidence: 79%

Glider-Based Active Acoustic Monitoring of Currents and Turbidity in the Coastal Zone

et al. 2020

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“…It is also important to note that because of the microtidal context the freshwater plume from the Rhône River spreads on the surface of the sea and is only mixed with the seawater in the first meters of the water column (Many et al 2017). At a depth of 20 m, the bottom water is strictly “pure” seawater with a salinity around 38‰.…”

Section: Methodsmentioning

confidence: 99%

Isotopic Signature (δ¹³C, ∆¹⁴C) of DIC in Sediment Pore Waters: An Example from the Rhone River Delta

Dumoulin

Pozzato²,

Rassman³

et al. 2018

Radiocarbon

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A better understanding of the dynamics of different particulate organic matter (OM) pools in the coastal carbon budget is a key issue for quantifying the role of the coastal ocean in the global carbon cycle. To elucidate the benthic component of this carbon cycle at the land-sea interface, we investigated the carbon isotope signatures (δ13C and ∆14C) in the sediment pore waters dissolved inorganic carbon (DIC) in addition to the sediment OM to constrain the origin of the OM mineralized in sediments. The study site is located at the outlet of the Rhône River (Mediterranean Sea), which was chosen because this river is one of the most nuclearized rivers in Europe and nuclear 14C can serve as a tracer to follow the fate of the OM discharged by the river to the coastal sea. The ∆14C results found in the pore waters DIC show a general offset between buried and mineralized OM following a preferential mineralization model of young and fresh particles. For example, we found that the sediment OM has values with a mean ∆14C=–33‰ at sampling stations near the river mouth whereas enriched ∆14C values around +523‰ and +667‰ respectively were found for the pore waters DIC. This indicates complete mineralization of a riverine fraction of OM enriched in 14C in the river conduit during in-stream photosynthesis. In shelf sediments, the ∆14C of pore waters DIC is slightly enriched (+57‰) with sediment OM reaching –570‰. A mixing model shows that particles mineralized near the river mouth are certainly of riverine phytoplanktonic origin whereas OM mineralized on the shelf is of marine origin. This work highlights the fact that pore waters provide additional information compared to sediments alone and it seems essential to work on both pools to study the carbon budget in river prodelta.

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“…1700 m 3 s -1 ) into the Western Mediterranean basin (Launay et al, 2019), including 95% of suspended particulate matter (SPM) fluxes to the French Mediterranean coast (Sadaoui et al, 2016) and 50% of GoL primary production (Lochet and Leveau, 1990). The Mediterranean Se ' very low tidal range allows the Rhône riverine plume to expand westwards into the GoL (Boudet et al, 2017;Many et al, 2018). This plume is particularly apparent in e fi w me e e w e lum (Lorthiois et al, 2012) T e flue e SP from the Rhône River on both surface water and sediment is observed throughout the western Gulf (Durrieu de Madron et al, 2000;Espinasse et al, 2014a).…”

Section: Study Areamentioning

confidence: 99%

Patterns of trace metal bioaccumulation and trophic transfer in a phytoplankton-zooplankton-small pelagic fish marine food web

Chouvelon

Strady

Harmelin-Vivien

et al. 2019

Marine Pollution Bulletin

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Glider and satellite monitoring of the variability of the suspended particle distribution and size in the Rhône ROFI

Cited by 21 publications

References 57 publications

Glider-Based Active Acoustic Monitoring of Currents and Turbidity in the Coastal Zone

Glider-Based Active Acoustic Monitoring of Currents and Turbidity in the Coastal Zone

Isotopic Signature (δ¹³C, ∆¹⁴C) of DIC in Sediment Pore Waters: An Example from the Rhone River Delta

Patterns of trace metal bioaccumulation and trophic transfer in a phytoplankton-zooplankton-small pelagic fish marine food web

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Glider and satellite monitoring of the variability of the suspended particle distribution and size in the Rhône ROFI

Cited by 21 publications

References 57 publications

Glider-Based Active Acoustic Monitoring of Currents and Turbidity in the Coastal Zone

Glider-Based Active Acoustic Monitoring of Currents and Turbidity in the Coastal Zone

Isotopic Signature (δ13C, ∆14C) of DIC in Sediment Pore Waters: An Example from the Rhone River Delta

Patterns of trace metal bioaccumulation and trophic transfer in a phytoplankton-zooplankton-small pelagic fish marine food web

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Product

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Isotopic Signature (δ¹³C, ∆¹⁴C) of DIC in Sediment Pore Waters: An Example from the Rhone River Delta