Transfer of atmospheric matter through the euphotic layer in the northwestern Mediterranean: seasonal pattern and driving forces

Migon, Christophe; Sandroni, Valérie; Marty, Jean-Claude; Gasser, Beat; Miquel, Juan‐Carlos

doi:10.1016/s0967-0645(02)00031-0

Cited by 85 publications

(99 citation statements)

References 70 publications

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“…2c), mixing the water column. The increase in organic rich mass fluxes detected in the sediment traps could be linked to the rapid transference of particles downwards that has been observed during non-stratified water column conditions (Migon et al, 2002;Zúñiga et al, 2007).…”

Section: Pelagic Signal In Settled Materialsmentioning

confidence: 85%

“…During summer water column is stratified with a well developed deep chlorophyll maximum (Estrada et al, 1993). In those conditions primary productivity has been related to the development of diazotrophic communities (Marty et al, , 2009) that may induce vertical transfer events (Migon et al, 2002) that could explain the increase in TMF. Indeed, the organic matter settled in August has low δ 15 N values associated to N2-fixation ).…”

Section: Pelagic Signal In Settled Materialsmentioning

confidence: 99%

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Flux and composition of settling particles across the continental margin of the Gulf of Lion: the role of dense shelf water cascading

et al. 2010

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Section: Pelagic Signal In Settled Materialsmentioning

confidence: 85%

Section: Pelagic Signal In Settled Materialsmentioning

confidence: 99%

Flux and composition of settling particles across the continental margin of the Gulf of Lion: the role of dense shelf water cascading

et al. 2010

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“…Both the coupling (e.g., Jickells et al, 1998;Migon et al, 2002;Ternon et al, 2010;Brust et al, 2011) and decoupling (e.g., Buat-Ménard et al, 1989;Migon et al, 2002;Ternon et al, 2010) of dust deposition and particulate export have been reported. During our experiment, only ∼ 57 and 41 % (by mass) of the lithogenic particles initially added were recovered in the sediment traps six days after the first and second seedings, respectively .…”

Section: One Dust-deposition Event Several Particle Settling Populatmentioning

confidence: 95%

Quantification of the lithogenic carbon pump following a simulated dust-deposition event in large mesocosms

et al. 2014

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Abstract. Lithogenic particles, such as desert dust, have been postulated to influence particulate organic carbon (POC) export to the deep ocean by acting as mineral ballasts. However, an accurate understanding and quantification of the POC-dust association that occurs within the upper ocean is required in order to refine the "ballast hypothesis". In the framework of the DUNE (a DUst experiment in a lowNutrient, low-chlorophyll Ecosystem) project, two artificial seedings were performed seven days apart within large mesocosms. A suite of optical and biogeochemical measurements were used to quantify surface POC export following simulated dust events within a low-nutrient, low-chlorophyll ecosystem. The two successive seedings led to a 2.3-6.7-fold higher POC flux than the POC flux observed in controlled mesocosms. A simple linear regression analysis revealed that the lithogenic fluxes explained more than 85 % of the variance in POC fluxes. On the scale of a dust-deposition event, we estimated that 42-50 % of POC fluxes were strictly associated with lithogenic particles (through aggregation and most probably sorption processes). Lithogenic ballasting also likely impacted the remaining POC fraction which resulted from the fertilization effect. The observations support the "ballast hypothesis" and provide a quantitative estimation of the surface POC export abiotically triggered by dust deposition. In this work, we demonstrate that the strength of such a "lithogenic carbon pump" depends on the biogeochemical conditions of the water column at the time of deposition. Based on these observations, we suggest that this lithogenic carbon pump could represent a major component of the biological pump in oceanic areas subjected to intense atmospheric forcing.

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“…Although most of the particle flux is under biological control [Buat-Ménard et al, 1989], the residence time of the particles of atmospheric origin remains very long in the mixed layer because of the physical barrier created by the thermocline [Migon et al, 2002] and thus a particle residence time of at least 7 days is probably realistic. This allows the calculation of the potential DFe induced following different scenarios (from extremely low to strong Saharan events) in a 10 meter mixed layer (Table 2).…”

Section: Saharan Input Of Dfe Vs Phytoplankton Iron Requirementsmentioning

confidence: 99%

Dissolution of atmospheric iron in seawater

Bonnet¹

2004

Geophysical Research Letters

127

120

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In vitro dissolution experiments were conducted in seawater in order to quantify the partitioning between dissolved and particulate phases of iron associated to Saharan dust and urban particles. The percentage of iron released was very low (0.05 to 2.2%) depending on the particulate load, the aerosol source and the contact time. This percentage decreased with the amount of particles introduced following a power law, indicating that the process could be modeled. Indeed, these dissolution processes were a function of the lability of iron in relation to the particle source, the particle size and adsorption processes. According to these experiments, the dissolved iron induced in a 10 m mixed layer by Saharan events of various magnitudes ranges from 0.07 to 1 nM. Since these concentrations are in agreement with the natural iron requirements for the phytoplankton, such inputs can profoundly influence the primary production, especially in oligotrophic conditions.

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Transfer of atmospheric matter through the euphotic layer in the northwestern Mediterranean: seasonal pattern and driving forces

Cited by 85 publications

References 70 publications

Flux and composition of settling particles across the continental margin of the Gulf of Lion: the role of dense shelf water cascading

Flux and composition of settling particles across the continental margin of the Gulf of Lion: the role of dense shelf water cascading

Quantification of the lithogenic carbon pump following a simulated dust-deposition event in large mesocosms

Dissolution of atmospheric iron in seawater

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