Particle Geochemistry in the Atmosphere and Oceans

Buat‐Ménard, P.

doi:10.1007/978-94-009-7169-1_8

Cited by 39 publications

(10 citation statements)

References 117 publications

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“…For these calculations, a 70-m-deep mixed layer is assumed; Table 4 contains other pertinent data. From the SEAREX program, an atmospheric flux of total selenium has been estimated for the North Pacific (Buat-Menard 1983), but the speciation of this input is undetermined. For the central gyres, the atmospheric input term is significant, the input of atmospheric total selenium being up to 37% that from vertical mixing.…”

Section: Results Und Discussionmentioning

confidence: 99%

“…For a 50-m water column at V-II, the total selenium residence time is found to be 39 years. Assuming reductive incorporation with partial regeneration as organic selenide and partial particulate removal, we can use the particulate flux to estimate maximum removal rates of sele- Broecker and Peng 1982Broecker and Peng 1982Buat-Menard 1983. Cutter 1978 nite and selenate at V-II.…”

Section: Results Und Discussionmentioning

confidence: 99%

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The marine biogeochemistry of selenium: A re‐evaluation1

Cutter

Bruland

1984

Limnology & Oceanography

304

206

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Vertical and horizontal profiles from the North and South Pacific Oceans demonstrate the existence of three species of dissolved selenium: selenite, selenate, and organic selenide (operationally defined). In surface waters, organic selenide makes up about 80% of the total dissolved selenium, selenite concentrations are uniformly low, and selenate concentrations rise with increased vertical mixing. The organic selenide maximum (thought to consist of seleno-amino acids in peptides) coincides with the maxima of primary productivity, pigments, bioluminescence, and dissolved free amino acids. Deep ocean waters are enriched in selenite and selenate, while organic selenide is nondetectable. In suboxic waters of the tropical northeastern Pacific, organic selenide concentrations rise, while selenite values decrease. The downward flux of particulate selenium generally decreases with depth, and fluxing particulate selenium is found to be primarily in the (-2) oxidation state. These data allow a re-evaluation of the internal biogeochemical cycle of selenium. This cycle includes selective uptake, reductive incorporation, particulate transport, a multistep regeneration, and kinetic stabilization of thermodynamically unstable species.

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Section: Results Und Discussionmentioning

confidence: 99%

Section: Results Und Discussionmentioning

confidence: 99%

The marine biogeochemistry of selenium: A re‐evaluation1

Cutter

Bruland

1984

Limnology & Oceanography

304

206

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“…The sea surface microlayer is highly enriched in surface active organic material. Organic carbon (as well as P, I, and trace metals) has been found to be enriched by 2-5 orders of magnitude relative to subsurface water [Buat-Menard, 1983]. Different sampling techniques of the surface microlayer dilute the enriched monomolecular layer in relation to bulk seawater.…”

Section: Marine Source Marker Organic Compoundsmentioning

confidence: 99%

Particle size distribution of lipids in aerosols off the coast of Peru

Schneider¹,

Gagosian²

1985

J. Geophys. Res.

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Lipid components in aerosols were characterized as a function of particle size from samples collected in spring 1981 off the coast of Peru as part of the Sea‐Air Exchange Program. The investigation was designed to determine (1) the particle size distributions for different terrestrial and marine source marker organic compounds close to their source, (2) the importance of the atmosphere as an input source to the sea for terrestrial compounds, and (3) the significance of recycling of the terrestrial components of these compound classes from seawater back into the atmosphere. The terrestrially derived components of three compound classes (fatty alcohols, wax esters, and n‐alkanes) were found to have similar particle size distributions. They are relatively evenly distributed over the whole particle size range, suggesting (1) little modification of the wide spectrum of plant‐ and soil‐derived particles by short‐range transport offshore and (2) insignificant gas‐particle partitioning for these materials. On the other hand, the terrestrially derived fatty acid salts show a different particle size distribution probably due to their very different physicochemical properties. The atmospheric flux to the sea surface via both wet and dry deposition is not significant in relation to the flux through the euphotic zone of the water column for two lipids of terrestrial origin, octacosanoic acid and 24‐ethylcholest‐5‐en‐3β‐ol. No significant recycling from the sea surface back into the atmosphere was observed for lipid compounds of terrestrial origin. Marine‐derived sterols, fatty alcohols, and fatty acid salts were found in high concentrations in surface microlayer samples. The enrichment of these compound classes is about 2–4 orders of magnitude relative to bulk seawater.

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“…Atmospheric particulate matter plays a significant role in interactions between continents and oceans, especially by acting on the deep-sea sedimentation (Rea et al, 1985) and on the biogeochemistry of the oceans (Buat-M6nard, 1983). The remote marine areas, especially oligotrophic regions, are primarily of interest in relation to such inputs because the atmospheric fallout is one of the major sources of matter for these surface oceanic waters.…”

Section: Introductionmentioning

confidence: 99%

Origins of atmospheric particulate matter over the North Sea and the Atlantic Ocean

1992

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During the ANT Vll/l cruise of the RV Polarstern from Bremerhaven (Germany) to Rio Grande do Sul (Brazil), atmospheric particulate matter was collected by bulk filtration with a time step of 36 hours. Elemental analyses were performed in order to determine atmospheric aerosol concentrations of Al, Si, P, S, K, Ca, Ti, Mn, Fe, and Zn over the North Sea, the Channel, and the North and South Atlantic. The slight and continuous moving in latitude, associated with the large variability in concentration levels and chemical composition, allow us to point out the relative influence of the major sources of particulate matter: desert soil-dust in the tropical North Atlantic, anthropogenic emissions in the North Sea and the Channel, and biomass burning and continental biogenic activity in the tropical South Atlantic.

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Particle Geochemistry in the Atmosphere and Oceans

Cited by 39 publications

References 117 publications

The marine biogeochemistry of selenium: A re‐evaluation1

The marine biogeochemistry of selenium: A re‐evaluation1

Particle size distribution of lipids in aerosols off the coast of Peru

Origins of atmospheric particulate matter over the North Sea and the Atlantic Ocean

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