Glider monitoring of shelf suspended particle dynamics and transport during storm and flooding conditions

Bourrin, François; Many, Gaël; Madron, Xavier Durrieu de; Martín, Jacobo; Puig, Pere; Houpert, Loïc; Testor, Pierre; Kunesch, Stéphane; Mahiouz, K.; Béguery, Laurent

doi:10.1016/j.csr.2015.08.031

Cited by 28 publications

(46 citation statements)

References 44 publications

(60 reference statements)

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“…Bourrin et al . [] inferred a calibration relationship for this sensor for coastal waters of the Gulf of Lions (C mg/L = 1.747 * Bb NTU ).…”

Section: Methodsmentioning

confidence: 99%

“…The onboard sensors were an un-pumped SeaBird 41cp CTD, and a Wetlabs FLNTU that provided turbidity (Bb expressed in nephelometric turbidity units-NTU) based on backscattering measurements at 700 nm. Bourrin et al [2015] inferred a calibration relationship for this sensor for coastal waters of the Gulf of Lions (C mg/L 5 1.747 * Bb NTU ). Total concentration of large particles (particles L -1 ) Concentration of particles by size classes (particles L -1 ) 10 2 10 3 10 4 10 1 10 0 10 1 10 2 10 3 10 4 10 5 10 6 10 -1 [1-15 µm] From its dead reckoning navigation and GPS fixes at surface, the glider also allows to compute a mean current corresponding to the average of horizontal currents over each dive (hereafter referred to as the depthaverage currents, DAC).…”

Section: Glider-based Measurementsmentioning

confidence: 99%

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Deep sediment resuspension and thick nepheloid layer generation by open‐ocean convection

et al. 2017

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The Gulf of Lions in the northwestern Mediterranean is one of the few sites around the world ocean exhibiting deep open‐ocean convection. Based on 6 year long (2009–2015) time series from a mooring in the convection region, shipborne measurements from repeated cruises, from 2012 to 2015, and glider measurements, we report evidence of bottom thick nepheloid layer formation, which is coincident with deep sediment resuspension induced by bottom‐reaching convection events. This bottom nepheloid layer, which presents a maximum thickness of more than 2000 m in the center of the convection region, probably results from the action of cyclonic eddies that are formed during the convection period and can persist within their core while they travel through the basin. The residence time of this bottom nepheloid layer appears to be less than a year. In situ measurements of suspended particle size further indicate that the bottom nepheloid layer is primarily composed of aggregates between 100 and 1000 µm in diameter, probably constituted of fine silts. Bottom‐reaching open ocean convection, as well as deep dense shelf water cascading that occurred concurrently some years, lead to recurring deep sediments resuspension episodes. They are key mechanisms that control the concentration and characteristics of the suspended particulate matter in the basin, and in turn affect the bathypelagic biological activity.

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“…Bourrin et al . [] inferred a calibration relationship for this sensor for coastal waters of the Gulf of Lions (C mg/L = 1.747 * Bb NTU ).…”

Section: Methodsmentioning

confidence: 99%

Section: Glider-based Measurementsmentioning

confidence: 99%

Deep sediment resuspension and thick nepheloid layer generation by open‐ocean convection

et al. 2017

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“…The accumulation of this material is maybe due to the concomitant occurrence of river floods (Fig. 5d) and storms, which may have remobilized coarse material from a coastal setting (Bourrin et al, 2015).…”

Section: Late Holocene (42-0 Ka Cal Bp)mentioning

confidence: 99%

Holocene hydrological changes in the Rhône River (NW Mediterranean) as recorded in the marine mud belt

et al. 2016

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Abstract. Expanded marine Holocene archives are relatively scarce in the Mediterranean Sea because most of the sediments were trapped in catchment areas during this period. Mud belts are the most suitable targets to access expanded Holocene records. These sedimentary bodies represent excellent archives for the study of sea-land interactions and notably the impact of the hydrological activity on sediment accumulation. We retrieved a 7.2 m long sediment core from the Rhône mud belt in the Gulf of Lions in an area where the average accumulation rate is ca. 0.70 m 1000 yr −1 . This core thus provides a continuous and high-resolution record of the last 10 ka cal BP. A multiproxy dataset (XRF core scan, 14 C dates, grain size and organic-matter analysis) combined with seismic stratigraphic analysis was used to document decadal to centennial changes in the Rhône hydrological activity. Our results show that (1) the early Holocene was characterized by high sediment delivery likely indicative of local intense (but short-duration) rainfall events, (2) important sediment delivery around 7 ka cal BP presumably related to increased river flux, (3) a progressive increase in continental/marine input during the mid-Holocene despite increased distance from river outlets due to sea-level rise possibly related to higher atmospheric humidity caused by the southward migration of the storm tracks in the North Atlantic, (4) multidecadal to centennial humid events took place in the late Holocene. Some of these events correspond to the cold periods identified in the North Atlantic (Little Ice Age, LIA; Dark Ages Cold Period) and also coincide with time intervals of major floods in the northern Alps. Other humid events are also observed during relatively warm periods (Roman Humid Period and Medieval Climate Anomaly).

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“…At the same time, river floods deliver large amounts of nutrients that induce phytoplankton blooms which feed the pelagic and benthic biota (Auger et al, 2011). Waves and storm-induced currents can resuspend fine particulates from centimetres in the sediment (Toussaint et al, 2014;Bourrin et al, 2015) and transport them away from the nearshore coastal zone, thus feeding deeper benthic communities spread on the shelf and deep slope (Jahnke et al, 1990). Export from the shelf to the deep-sea is also dominated by intense events (Sanchez-Vidal et al, 2008) through cascading or downwelling in canyons.…”

Section: Episodic Events and Recoverymentioning

confidence: 99%

Modelling Marine Sediment Biogeochemistry: Current Knowledge Gaps, Challenges, and Some Methodological Advice for Advancement

et al. 2018

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The benthic environment is a crucial component of marine systems in the provision of ecosystem services, sustaining biodiversity and in climate regulation, and therefore important to human society. With the contemporary increase in computational power, model resolution and technological improvements in quality and quantity of benthic data, it is necessary to ensure that benthic systems are appropriately represented in coupled benthic-pelagic biogeochemical and ecological modelling studies. In this paper we focus on five topical challenges related to various aspects of modelling benthic environments: organic matter reactivity, dynamics of benthic-pelagic boundary layer, microphytobenthos, biological transport and small-scale heterogeneity, and impacts of episodic events. We discuss current gaps in their understanding and indicate plausible ways ahead. Further, we propose a three-pronged approach for the advancement of benthic and benthic-pelagic modelling, essential for improved understanding, management and prediction of the marine environment. This includes: (A) development of a traceable and hierarchical framework for benthic-pelagic models, which will facilitate integration among models, reduce risk of bias, and clarify model limitations; (B) extended cross-disciplinary approach to promote effective collaboration between modelling and empirical scientists of various backgrounds and better involvement of stakeholders and end-users; (C) a common vocabulary for terminology used in benthic modelling, to promote model development and integration, and also to enhance mutual understanding.

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Glider monitoring of shelf suspended particle dynamics and transport during storm and flooding conditions

Cited by 28 publications

References 44 publications

Deep sediment resuspension and thick nepheloid layer generation by open‐ocean convection

Deep sediment resuspension and thick nepheloid layer generation by open‐ocean convection

Holocene hydrological changes in the Rhône River (NW Mediterranean) as recorded in the marine mud belt

Modelling Marine Sediment Biogeochemistry: Current Knowledge Gaps, Challenges, and Some Methodological Advice for Advancement

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