The benthic cycle of biogenic opal at the Bermuda Atlantic Time Series site

Sayles, F.L.; Deuser, W. G.; Goudreau, J.; Dickinson, W.; Jickells, Tim; King, P.

doi:10.1016/0967-0637(96)00027-1

Cited by 48 publications

(24 citation statements)

References 32 publications

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“…Using sediment traps near Guinea, Takahashi and Honjo (1981) also found that radiolarian shells did not dissolve substantially between about 1000 m and the sea floor. Sayles et al (1996) reached a similar conclusion in the Sargasso Sea, where they found that below the first 150 m, where 66% of the dissolution had taken place, no apparent dissolution occurred before particles reach the sea floor. Partides particles reaching the bottom remain on the sea floor for a few hundred years; most eventually remineralize with only a small fraction fully buried and lost to the ocean system.…”

Section: Silicasupporting

confidence: 49%

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Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen

Ganachaud¹

1999

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Section: Silicasupporting

confidence: 49%

“…At the edge of the subtropical gyre, Williams and Follows (1998) (Sayles et a!., 1996), the change would not be seen in the dissolution on the sea floor.…”

Section: Discussion Of Nutrient Fluxes and Divergencesmentioning

confidence: 99%

Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen

Ganachaud¹

1999

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“…Tréguer and De La Rocha (2013) had previously considered diffusion from nonsiliceous sediments to reflect dissolution/alteration of ocean basalts or terrigenous sediments. They employed an areal diffusive flux rate of 10-20 mmol m -2 year -1 from the study of Sayles et al (1996), which is an order of magnitude less than the rate derived here for non-siliceous sediments. Either the dissolution of ocean basalt and terrigenous detrital sediment is greatly underestimated in recent budgets, or there is a more active benthic biological Si cycle in these regions than conventionally recognised, perhaps via sponges (e.g.…”

Section: Resultsmentioning

confidence: 99%

Revisiting the dissolution of biogenic Si in marine sediments: a key term in the ocean Si budget

Frings

2017

Acta Geochim

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Of the *240 9 10 12 mol year -1 of biogenic silica (bSi) produced by diatoms and other silicifying organisms, only roughly 3%-4% escapes dissolution to be permanently buried. At the global scale, how, where and why bSi is preserved in sediment is not well understood. To help address this, I compile 6245 porewater dissolved Si concentrations from 453 sediment cores, to derive the concentration gradient at the sediment-water interface and thus diffusive fluxes out of the sediment. These range from \0.002 to 3.4 mol m -2 year -1 , and are independent of temperature, depth and latitude. When classified by sediment lithology, predominantly siliceous sediments unsurprisingly have higher mean diffusive fluxes than predominantly calcareous or clay-rich sediment. Combined with the areal extent of these lithologies, the 'best-guess' global sedimentary bSi recycling flux is 69 9 10 12 mol year -1 .

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“…RMSDs varied between 1.2 and 16.0 µmol l −1 . Benthic Si fluxes were estimated after Sayles et al (1996) using…”

Section: Pore Water Profile Simulation and Fittingmentioning

confidence: 99%

Microbial mediation of benthic biogenic silica dissolution

Holstein

Hensen

2009

Geo-Mar Lett

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Pore water profiles from 24 stations in the South Atlantic (located in the Guinea, Angola, Cape, Guyana, and Argentine basins) show good correlations of oxygen and silicon, suggesting microbially mediated dissolution of biogenic silica. We used simple analytical transport and reaction models to show the tight coupling of the reconstructed process kinetics of aerobic respiration and silicon regeneration. A generic transport and reaction model successfully reproduced the majority of Si pore water profiles from aerobic respiration rates, confirming that the dissolution of biogenic silica (BSi) occurs proportionally to O 2 consumption. Possibly limited to well-oxygenated sediments poor in BSi, benthic Si fluxes can be inferred from O 2 uptake with satisfactory accuracy. Compared to aerobic respiration kinetics, the solubility of BSi emerged as a less influential parameter for silicon regeneration. Understanding the role of bacteria for silicon regeneration requires further investigations, some of which are outlined. The proposed aerobic respiration control of benthic silicon cycling is suitable for benthic-pelagic models. The empirical relation of BSi dissolution to aerobic respiration can be used for regionalization assessments and estimates of the silicon budget to increase the understanding of global primary and export production patterns.

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The benthic cycle of biogenic opal at the Bermuda Atlantic Time Series site

Cited by 48 publications

References 32 publications

Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen

Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen

Revisiting the dissolution of biogenic Si in marine sediments: a key term in the ocean Si budget

Microbial mediation of benthic biogenic silica dissolution

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