Barium in the Antarctic Ocean and implications regarding the marine geochemistry of Ba and226Ra

Li, Y.H.; Ku, Teh‐Lung; Mathieu, Guy; Wolgemuth, K.

doi:10.1016/0012-821x(73)90085-x

Cited by 67 publications

(37 citation statements)

References 24 publications

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“…The intercept on the horizontal Ba axis is 4.4 nmol L -1 for the GA01 section, which is in agreement with GEOSECS data (Chan et al, 1976;Li et al, 1973). This positive intercept may be the result a greater input of 226 Ra relative to Ba close to bottom sediments and a larger riverine Ba input relative to 226 Ra (Ku and Luo, 1994).…”

Section: Ra-ba and 226 Ra-ba-si Relationshipssupporting

confidence: 78%

“…In contrast to the 226 Ra-Ba relationship, the slope of the 226 Ra-Si(OH)4 relationship during GEOSECS exhibited significant spatial variability from one oceanic basin to the other (Li et al, 1973). 5…”

Section: Ra-ba and 226 Ra-ba-si Relationshipsmentioning

confidence: 84%

“…Hence, despite different principal sources to the ocean, rivers in the case of Ba and marine sediment diffusion for 226 Ra, their distributions are affected by similar processes in the water column. Barium displays a linear correlation with 226 Ra in the global ocean, resulting in a fairly constant 226 Ra/Ba ratio of 30 2.2 ± 0.2 dpm µmol -1 (dpm, disintegrations per minute) (Chan et al, 1976;Foster et al, 2004;Ku et al, 1980;Li et al, 1973;Östlund et al, 1987). Similarly, strong correlations were also found between Ba-Si (silicate) and 226 Ra-Si.…”

Section: Introductionmentioning

confidence: 89%

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The <sup>226</sup>Ra-Ba relationship in the North Atlantic during GEOTRACES-GA01

Roy¹,

Sanial²,

Charette³

et al. 2017

Preprint

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Abstract. We report detailed sections of radium-226 ( 226 Ra, T1/2 = 1602 y) activities and barium (Ba) 20 concentrations determined in the North Atlantic (Portugal-Greenland-Canada) in the framework of the international GEOTRACES program (GA01 section-GEOVIDE project, May-July 2014). Dissolved 226 Ra and Ba are strongly correlated along the GA01 section, a pattern that reflects their similar chemical behavior. Since 226 Ra and Ba have been widely used as tracers of water masses and ocean mixing, we investigated more thoroughly their behavior in this crucial region for thermohaline 25 circulation taking advantage of the contrasting biogeochemical patterns existing along the GA01 section. We used an Optimum Multiparameter (OMP) analysis to distinguish the relative importance of physical transport (water mass mixing) from non-conservative processes (sedimentary, river, or hydrothermal inputs; uptake by particles, and dissolved-particulate dynamics) on the 226 Ra from sediment and low 226 Ra/Ba ratios in the upper water column reflect the input of Ba associated with meteoric waters.

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Section: Ra-ba and 226 Ra-ba-si Relationshipssupporting

confidence: 78%

Section: Ra-ba and 226 Ra-ba-si Relationshipsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 89%

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The <sup>226</sup>Ra-Ba relationship in the North Atlantic during GEOTRACES-GA01

Roy¹,

Sanial²,

Charette³

et al. 2017

Preprint

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“…Submarine volcanism however, may be locally important [9]. Because of the good correlation observed between dissolved barium and silicon in the water column it has been suggested that the distribution of both elements is governed by the dissolution of Baenriched siliceous frustules [4,[10][11][12]. This conclusion was supported by earlier observations that some diatom species are able to accumulate significant amounts of Ba [13,14].…”

Section: Geosecs Publication No 125supporting

confidence: 78%

“…The profiles of dissolved Ba are characterized by a depletion in surface water and an enrichment in deep water. This suggests a close association of Ba with the biological cycle [3,4].…”

Section: Introductionmentioning

confidence: 96%

Discrete suspended particles of barite and the barium cycle in the open ocean

Dehairs

Chesselet

Jedwab

1980

Earth and Planetary Science Letters

596

399

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Barite particles are a universal component of suspended matter in the Atlantic and Pacific Oceans. This is demonstrated by scanning electron microscope and electron microprobe analyses of samples collected during the GEOSECS program. These discrete particles, about 1 #m in diameter, account for by far the greatest part of the total particulate barium of most of the filters collected at different depths. Total particulate barium (mean value: 20 ng/kg seawater) was measured on the same filters by instrumental neutron activation analysis.Several observations indicate that biochemical, rather than purely chemical, processes are involved in the formation of the BaSO4 mineral in the water column. Sr/Ba molar ratios among the individual barite grains, particularly from surface waters are extremely variable, which would not be anticipated for purely chemical interactions. Barite crystals occurring within fecal debris have been observed throughout the water column. Within such debris decomposition of the abundant organic matter may provide the micro-environment predicted as necessary for the precipitation of BaSO4. Finally, a strong correlation between nutrient content and particulate barium is found in the upper 1000 m of the water column, which also suggests a control of barite formation by biota.Some of the barite dissolves at depth in the water column. Dissolution rates were calculable for two GEOSECS stations, from which a dissolved barium flux of 0.4 ~g/cm 2 yr was deduced. This figure is of the same order as the dissolved barium flux calculable from the barium content and known dissolution rates of calcareous and siliceous tests: approximately 0.5/ag/cm 2 yr. These fluxes represent the largest source of dissolved barium in the water column, the other being river input (0.6/~g/cm 2 yr). This supports the contention that the barium in the water column is mostly recycled. The residual flux of barite-Ba reaching the sea floor is of about equal importance as the flux of barium associated with fast-settling fecal material. These two sources together are almost sufficient to account for the total sedimentation rate of barium.

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Radiogenic Isotopes in Dating of Natural Waters and Sediments

Ferronsky

2015

Nuclear Geophysics

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Barium in the Antarctic Ocean and implications regarding the marine geochemistry of Ba and226Ra

Cited by 67 publications

References 24 publications

The <sup>226</sup>Ra-Ba relationship in the North Atlantic during GEOTRACES-GA01

The <sup>226</sup>Ra-Ba relationship in the North Atlantic during GEOTRACES-GA01

Discrete suspended particles of barite and the barium cycle in the open ocean

Radiogenic Isotopes in Dating of Natural Waters and Sediments

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Barium in the Antarctic Ocean and implications regarding the marine geochemistry of Ba and226Ra

Cited by 67 publications

References 24 publications

The &lt;sup&gt;226&lt;/sup&gt;Ra-Ba relationship in the North Atlantic during GEOTRACES-GA01

The &lt;sup&gt;226&lt;/sup&gt;Ra-Ba relationship in the North Atlantic during GEOTRACES-GA01

Discrete suspended particles of barite and the barium cycle in the open ocean

Radiogenic Isotopes in Dating of Natural Waters and Sediments

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Product

Resources

About

The <sup>226</sup>Ra-Ba relationship in the North Atlantic during GEOTRACES-GA01

The <sup>226</sup>Ra-Ba relationship in the North Atlantic during GEOTRACES-GA01