A sediment trap and radioisotope study to determine resuspension of particle reactive substances in the sound between Sweden and Denmark

Roos, Per; Valeur, Jens Rosendal

doi:10.1016/j.csr.2006.01.001

Cited by 19 publications

(8 citation statements)

References 18 publications

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“…Particle resuspension is likely the primary source of elevated 7 Be and 210 Pb xs activities in the sediment traps, which is expected in a turbulent river system. Although no previous data exist for riverine systems, similar findings have been reported in the shallow turbulent Øresund Sound (only ,5% of 210 Pb fluxes were derived from atmospheric deposition), which connects the Baltic and North Seas (Roos and Valeur 2006). 7 Be : 210 Pb xs activity ratios as indicators of resuspension-The 7 Be : 210 Pb xs activity ratios in sediment trap material (Table 3) ranged from 1.00 to 2.52 (GM: 1.69 6 0.41, n 5 30).…”

Section: Stasupporting

confidence: 70%

Short‐lived radionuclides (⁷Be and ²¹⁰Pb) as tracers of particle dynamics in a river system in southeast Michigan

Jweda

Baskaran

Hees

et al. 2008

Limnology & Oceanography

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Riverine water samples (dissolved and particulate), surficial bottom sediments, and trapped sediments were collected mostly monthly from three stations along the Clinton River, in southeastern Michigan, over a period of ,1 yr and analyzed for 7 Be and 210 Pb to elucidate the types and rates of processes affecting particle dynamics in a riverine system. Using a simple irreversible scavenging box model approach, sources and sinks for dissolved and particulate 7 Be and 210 Pb were quantified to estimate their residence times in the dissolved and particulate phases. Resuspension rates of surficial bottom sediments calculated from the mass balance of particulate 7 Be varied from 0.50 to 1.34 (geometric mean: 0.83 6 0.34) g cm 22 yr 21 , while corresponding values varied from 0.16 to 1.48 (GM: 0.38 6 0.38) g cm 22 yr 21 using particulate 210 Pb. Based on the 210 Pb mass balance, it appears that only ,2% of 210 Pb was derived from direct atmospheric deposition, while ,98% was derived from resuspension of bottom sediments. Additionally, there was a large discrepancy between mass flux collected in the trap (GM: 8.9 g cm 22 yr 21 ) compared to net sediment accumulation rates (GM: 0.88 6 0.38 g cm 22 yr 21 ), which was attributed to sediment resuspension; this may provide insight into the frequency of particle-recycling events. Furthermore, desorption of particle-reactive species during resuspension events could result in the mobility of contaminants to farther distances from the contaminated site. Therefore, this study has direct relevance to the uptake of particle-reactive species in a riverine system and thereby the water quality of rivers.

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Section: Stasupporting

confidence: 70%

Short‐lived radionuclides (⁷Be and ²¹⁰Pb) as tracers of particle dynamics in a river system in southeast Michigan

Jweda

Baskaran

Hees

et al. 2008

Limnology & Oceanography

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“…Observed strong variations in total material flux are discussed in detail by Giering et al (2018); however, similar high variations in total mass flux have been reported elsewhere. A more than hundred-fold increase in sediment trap mass flux between time-series samples was recorded by Roos and Valeur (2006) and was attributed to water column stratification.…”

Section: Sediment Trapsmentioning

confidence: 99%

Scales of seafloor sediment resuspension in the northern Gulf of Mexico

Diercks

Dike

Asper

et al. 2018

Elementa: Science of the Anthropocene

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Diercks, A-R, et al. 2018 Scales of seafloor sediment resuspension in the northern Gulf of Mexico. Elem Sci Anth, 6: 32. DOI: https://doi. org/10.1525/elementa.285 IntroductionThe sedimentation of large amounts of oil via marine snow and its accumulation on the deep seafloor (>1,200 m) during and after the Deepwater Horizon (DwH) oil spill (Passow et al., 2012;Valentine et al., 2014;Brooks et al., 2015;Chanton et al., 2015;Daly et al., 2016;Joye, 2016;Joye et al., 2016;Passow, 2016) raised questions regarding the distribution and re-distribution processes of freshly sedimented material (marine snow) on the seafloor. Once on the seafloor, marine snow contributes to unconsolidated fluffy sediment layers (Gardner, 1978;Gardner et al., 1984;1985;Walsh et al., 1988;Pilskaln et al., 1998;Newell et al., 2005) that are subject to resuspension and the production of benthic nepheloid layers (BNLs).Resuspension leads to the re-invigoration of degradation processes, which would impact the degradation rates of the oil associated with marine snow following the DwH accident (Ziervogel et al., 2016). Additionally, resuspension leads to lateral transport and redistribution of the material that sank to the seafloor. After the DwH accident such re-distribution processes make it especially difficult to estimate the total amount of Macondo oil that reached the seafloor (Passow and Hetland, 2016).BNLs, which are formed when the frictional stress of water motion strips sediment off the seafloor, therewith carrying particles into the overlying water layer, exist near the seafloor, but may reach tens to hundreds of meters upward into the water column (McCave et al., 1976). The thickness of the BNL extending above the seafloor scales with the strength of the bottom currents and the particle composition. Bottom currents >10 cm s -1 may cause resuspension events (Gardner et al., 2017), especially when low density phytodetritus or fine silt covers sediments, but large benthic storms reach 20 cm s -1 (Gardner et al., 1985). Besides locally resuspended material, particles in the BNL also include aggregates settling from the upper ocean as Time-series data of size-specific in-situ settling speeds of marine snow in the benthic nepheloid layer (moored flux cameras), particle size distributions (profiling camera), currents (various current meters) and stacked time-series flux data (sediment traps) were combined to recognize resuspension events ranging from small-scale local, to small-scale far-field to hurricane-scale. One smallscale local resuspension event caused by inertial currents was identified based on local high current speeds (>10 cm s -1) and trap data. Low POC content combined with high lithogenic silica flux at 30 m above bottom (mab) compared to the flux at 120 mab, suggested local resuspension reaching 30 mab, but not 120 mab. Another similar event was detected by the changes in particle size distribution and settling speeds of particles in the benthic nepheloid layer. Flux data indicated two other small-scale events, which occurre...

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“…The alpha-emitter 228 Th is most conveniently determined by standard alpha spectrometry, it may also be determined by gamma spectrometry through one of its daughter isotopes when activity levels are sufficient. The beta emitter 234 Th has played a major role as a particle tracer in the marine environment, especially a rate tracer for POC vertical fluxes [254]. Several techniques for direct measurement of 234 Th onboard a ship or in the shore based laboratory have been developed.…”

Section: Isotopes Of Thorium and Uraniummentioning

confidence: 99%

Critical comparison of radiometric and mass spectrometric methods for the determination of radionuclides in environmental, biological and nuclear waste samples

Hou

Roos

2008

Analytica Chimica Acta

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339

253

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A sediment trap and radioisotope study to determine resuspension of particle reactive substances in the sound between Sweden and Denmark

Cited by 19 publications

References 18 publications

Short‐lived radionuclides (⁷Be and ²¹⁰Pb) as tracers of particle dynamics in a river system in southeast Michigan

Short‐lived radionuclides (⁷Be and ²¹⁰Pb) as tracers of particle dynamics in a river system in southeast Michigan

Scales of seafloor sediment resuspension in the northern Gulf of Mexico

Critical comparison of radiometric and mass spectrometric methods for the determination of radionuclides in environmental, biological and nuclear waste samples

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A sediment trap and radioisotope study to determine resuspension of particle reactive substances in the sound between Sweden and Denmark

Cited by 19 publications

References 18 publications

Short‐lived radionuclides (7Be and 210Pb) as tracers of particle dynamics in a river system in southeast Michigan

Short‐lived radionuclides (7Be and 210Pb) as tracers of particle dynamics in a river system in southeast Michigan

Scales of seafloor sediment resuspension in the northern Gulf of Mexico

Critical comparison of radiometric and mass spectrometric methods for the determination of radionuclides in environmental, biological and nuclear waste samples

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Short‐lived radionuclides (⁷Be and ²¹⁰Pb) as tracers of particle dynamics in a river system in southeast Michigan

Short‐lived radionuclides (⁷Be and ²¹⁰Pb) as tracers of particle dynamics in a river system in southeast Michigan