Dust iron dissolution in seawater: Results from a one‐year time‐series in the Mediterranean Sea

Wagener, Thibaut; Pulido-Villena, Elvira; Guieu, Cécile

doi:10.1029/2008gl034581

Cited by 73 publications

(86 citation statements)

References 25 publications

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“…The difference between these two depends on total ligands and Fe concentration. Assuming a ligand concentration of 3 µmol m −3 measured at the JGOFS-DYFAMED time-series station in June 2006 (Wagener et al, 2008), combined with the same dust addition as in DUNE, a critical concentration of ∼3.4 µmol m −3 results from Eq. (7), indicating that dust deposition could act as DFe source much longer in a system with high ligand abundance.…”

Section: Role Of Dust Deposition In Iron Replete Watersmentioning

confidence: 99%

“…In lab studies, increasing leaching time results in increases in Fe dissolution (Bonnet and Guieu, 2004) indicating that Fe dissolution is a multi-timescale process. Wagener et al (2008) studied the dissolution kinetics of Fe from dust particles and supposed one fast and one slowly dissolvable iron fraction. We introduced a dissolution timescale of 3 days into our model which represents the fast dissolution of iron.…”

Section: Chemical Modelmentioning

confidence: 99%

“…A dissolution timescale of 3 days is used in our standard model setup, corresponding to the stage of fast dissolution in Wagener et al (2008). Surface DFe drops rapidly in the first hours, adsorbing onto large particles in high abundance (Fig.…”

Section: Sensitivity Study With Respect To Iron Dissolution Timescalementioning

confidence: 99%

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Dust deposition: iron source or sink? A case study

Wagener

Völker

et al. 2011

Biogeosciences

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Abstract. A significant decrease of dissolved iron (DFe) concentration has been observed after dust addition into mesocosms during the DUst experiment in a low Nutrient low chlorophyll Ecosystem (DUNE), carried out in the summer of 2008. Due to low biological productivity at the experiment site, biological consumption of iron can not explain the magnitude of DFe decrease. To understand processes regulating the observed DFe variation, we simulated the experiment using a one-dimensional model of the Fe biogeochemical cycle, coupled with a simple ecosystem model. Different size classes of particles and particle aggregation are taken into account to describe the particle dynamics. DFe concentration is regulated in the model by dissolution from dust particles and adsorption onto particle surfaces, biological uptake, and photochemical mobilisation of particulate iron.The model reproduces the observed DFe decrease after dust addition well. This is essentially explained by particle adsorption and particle aggregation that produces a high export within the first 24 h. The estimated particle adsorption rates range between the measured adsorption rates of soluble iron and those of colloidal iron, indicating both processes controlling the DFe removal during the experiment. A dissolution timescale of 3 days is used in the model, instead of an instantaneous dissolution, underlining the importance of dissolution kinetics on the short-term impact of dust deposition on seawater DFe.Sensitivity studies reveal that initial DFe concentration before dust addition was crucial for the net impact of dust addition on DFe during the DUNE experiment. Based on the balance between abiotic sinks and sources of DFe, a critical DFe concentration has been defined, above which dust depoCorrespondence to: Y. Ye (ying.ye@awi.de) sition acts as a net sink of DFe, rather than a source. Taking into account the role of excess iron binding ligands and biotic processes, the critical DFe concentration might be applied to explain the short-term variability of DFe after natural dust deposition in various different ocean regions.

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Section: Role Of Dust Deposition In Iron Replete Watersmentioning

confidence: 99%

Section: Chemical Modelmentioning

confidence: 99%

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Dust deposition: iron source or sink? A case study

Wagener

Völker

et al. 2011

Biogeosciences

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“…A mineralogical influence has also been detected in long-term dissolution experiments. Most dust dissolution experiments are carried out over relatively short periods of time (days to weeks) but year-long in situ dissolution experiments in the Mediterranean seawater (Wagener et al, 2008) identified two pools of iron; a fast released pool which was dissolved an order of magnitude more quickly than a slow released pool (from which the rate of dissolution appeared to be controlled by organic ligands). These data convince me that there is a mineralogical control on dust dissolution and dissolution kinetics.…”

Section: Atmospheric Processing Of Aeolian Dustmentioning

confidence: 99%

The Iron Biogeochemical Cycle Past and Present

Raiswell¹,

Canfield²

2012

GeochemPersp

582

445

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“…Emission sources, such as volcanoes, biomass burning and anthropogenic sources including ship plumes (see section below), differ in composition and spatial and temporal distribution, and so establishing how each affects ocean biogeochemistry will be key to determining variability in regional response. The effect of atmospheric deposition in the surface ocean may vary with the biogeochemical state of the receiving waters, [95] and result in fundamental differences in the response of the microbial community structure (e.g. stimulation of heterotrophy v. autotrophy [96] ), and so vertical carbon export and nutrient cycling.…”

Section: Atmospheric Nutrient Supply To the Surface Oceanmentioning

confidence: 99%

Evolving research directions in Surface Ocean - Lower Atmosphere (SOLAS) science

Law¹,

Breviere²,

Leeuw³

et al. 2013

Environ. Chem.

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Environmental context. Understanding the exchange of energy, gases and particles at the ocean-atmosphere interface is critical for the development of robust predictions of, and response to, future climate change. The international Surface Ocean-Lower Atmosphere Study (SOLAS) coordinates multi-disciplinary oceanatmosphere research projects that quantify and characterise this exchange. This article details five new SOLAS research strategies -upwellings and associated oxygen minimum zones, sea ice, marine aerosols, atmospheric nutrient supply and ship emissions -that aim to improve knowledge in these critical areas.Abstract. This review focuses on critical issues in ocean-atmosphere exchange that will be addressed by new research strategies developed by the international Surface Ocean-Lower Atmosphere Study (SOLAS) research community. Eastern boundary upwelling systems are important sites for CO 2 and trace gas emission to the atmosphere, and the proposed research will examine how heterotrophic processes in the underlying oxygen-deficient waters interact with the climate system. The second regional research focus will examine the role of sea-ice biogeochemistry and its interaction with atmospheric chemistry. Marine aerosols are the focus of a research theme directed at understanding the processes that determine their abundance, chemistry and radiative properties. A further area of aerosol-related research examines atmospheric nutrient deposition in the surface ocean, and how differences in origin, atmospheric processing and composition influence surface ocean biogeochemistry. Ship emissions are an increasing source of aerosols, nutrients and toxins to the atmosphere and ocean surface, and an emerging area of research will examine their effect on ocean biogeochemistry and atmospheric chemistry. The primary role of SOLAS is to coordinate coupled multi-disciplinary research within research strategies that address these issues, to achieve robust representation of critical ocean-atmosphere exchange processes in Earth System models.

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Dust iron dissolution in seawater: Results from a one‐year time‐series in the Mediterranean Sea

Cited by 73 publications

References 25 publications

Dust deposition: iron source or sink? A case study

Dust deposition: iron source or sink? A case study

The Iron Biogeochemical Cycle Past and Present

Evolving research directions in Surface Ocean - Lower Atmosphere (SOLAS) science

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