Dissolution of aerosol-derived iron in seawater: Leach solution chemistry, aerosol type, and colloidal iron fraction

Aguilar-Islas, Ana M.; Wu, Jingfeng; Rember, Robert; Johansen, Anne M.; Shank, L.

doi:10.1016/j.marchem.2009.01.011

Cited by 106 publications

(107 citation statements)

References 52 publications

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“…The dissolution experiments of Aguilar-Islas et al (2010) and Wagener et al (2010) also show the importance of addressing the fate of atmosphericallyprocessed dust on entering seawater. Dust is removed from the atmosphere by dry or wet deposition with the former generally predominating by approximately 2:1, although proportions vary in time and space (Jickells and Spokes, 2001).…”

Section: Atmospheric Processing Of Aeolian Dustmentioning

confidence: 99%

The Iron Biogeochemical Cycle Past and Present

Raiswell¹,

Canfield²

2012

GeochemPersp

565

445

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Section: Atmospheric Processing Of Aeolian Dustmentioning

confidence: 99%

The Iron Biogeochemical Cycle Past and Present

Raiswell¹,

Canfield²

2012

GeochemPersp

565

445

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“…5 research indicated the importance of dust composition and mineralogy for trace metal solubility (Aguilar-Islas et al, 2010;Sholkovitz et al, 2012), which highlights the need to link dust samples to specific sources.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Aerosol time-series measurements over the tropical Northeast Atlantic Ocean: Dust sources, elemental composition and mineralogy

et al. 2015

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The North Atlantic receives the largest dust loading of any of the world's oceans due to its proximity to North African deserts and prevailing wind patterns. The supply of biologically important trace elements and nutrients via aerosols has an important influence on biogeochemical processes and ecosystems in this ocean region. In this study we continuously sampled aerosols between July 2007 and July 2008 at the Cape Verde Atmospheric Observatory (CVAO), which is situated on an island group close to the North African continent and under the Saharan/Sahelian dust outflow path. The aim of our work was to investigate temporal variations in aerosol concentration, composition and sources in the Cape Verde region over a complete seasonal cycle, and for this purpose we undertook mineralogical and chemical (42 elements ). These observations have been attributed to dust transport occurring in higher altitude air layers and mainly north of the Cape Verde during summer, whilst in winter the dust transport shifts south and occurs in the lower altitude trade winds with consequent greater influence on the Cape Verde region. The elemental composition of the aerosols closely agreed with mean upper crustal abundances, with the exception of elements with pronounced anthropogenic sources (e.g. Zn and Pb) and major constituents of sea water (Na and Mg). A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT3 Mineral analysis showed that clays were the most abundant mineral fraction throughout the whole sampling period, with an increase in quartz and clays during strong dust events and an associated decrease in calcite. This could have important implications for the estimation of release of for exampleFe from mineral dust with clays having a higher Fe solubility than quartz.The elemental composition and mineralogy of aerosol samples collected during the cruise were indistinguishable from those collected at the CVAO during the same period, although mean atmospheric Al was 65% higher at the CVAO than those measured on the ship due to the irregular and uneven nature of dust transport.Air mass back-trajectories showed an important role for southern source regions of the NorthAfrican deserts during summer, with 92.5% of the samples indicating a contribution from the Sahel.Significantly elevated ratios of V, Ni, Cu, Zn, Cd and Pb with Al were present in samples originating from the Sahel compared with samples with a more northerly origin. This was likely due to enhanced anthropogenic emissions related to the greater population densities in the Sahel compared with the less developed Saharan regions further north.Ratios of other elements and trends in rare earth elements could however not be used to distinguish differences in source regions. Similar source material compositions, the mixing of dust from different regions during transport, and the pooling of samples over a 1-3 day collection period appears to have diluted specific signals from source regions.

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“…1), followed by 0.2 µm filtration, to make the aerosol leachate. We choose the leaching time of about 1 h according to previous studies (Martin et al, 1991;Aguilar-Islas et al, 2010;Hsu et al, 2010). The leachate was stored in dark at 4 • C.…”

Section: Atmospheric Aerosol Collection and Treatmentmentioning

confidence: 99%

Dynamics of phytoplankton community structure in the South China Sea in response to the East Asian aerosol input

Guo

Wang

et al. 2012

Biogeosciences

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Abstract. Recent studies have demonstrated atmospheric deposition as an important source of bioreactive compounds to the ocean. The South China Sea (SCS), where aerosol loading is among the highest in the world, however, is poorly studied, particularly on the in situ response of phytoplankton community structures to atmospheric deposition. By conducting a series of microcosm bioassays at different hydrographical locations and simulating different aerosol event scales, we observed both positive and negative responses to the input of East Asian (EA) aerosol with high nitrogen (N) and trace metal contents, in terms of biomass, composition and physiological characteristics of phytoplankton communities. High levels of aerosol loading relieved phytoplankton nitrogen and trace metal limitations in SCS, and thus increased total phytoplankton biomass, enhanced their physiological indicators (e.g. photosynthetic efficiency) and shifted phytoplankton assemblages from being dominated by picoplankton to microphytoplanton, especially diatoms. However, under low levels of aerosol loading, the composition shift and biomass accumulation were not apparent, suggesting that the stimulation effects might be counterbalanced by enhanced grazing mortality indicated by increased abundance of protist grazers. Trace metal toxicity of the aerosols might also be the reason for the reduction of picocyanobacteria when amended with high EA aerosols. The magnitude and duration of the deposition event, as well as the hydrographical and trophic conditions of receiving waters are also important factors when predicting the influence of an aerosol deposition event. Our results demonstrated different responses of phytoplankton and microbial food web dynamics to different scales of atmospheric input events in SCS and highlighted the need for achieving an accurate comprehension of atmospheric nutrient on the biogeochemical cycles of the oceans.

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Dissolution of aerosol-derived iron in seawater: Leach solution chemistry, aerosol type, and colloidal iron fraction

Cited by 106 publications

References 52 publications

The Iron Biogeochemical Cycle Past and Present

The Iron Biogeochemical Cycle Past and Present

Aerosol time-series measurements over the tropical Northeast Atlantic Ocean: Dust sources, elemental composition and mineralogy

Dynamics of phytoplankton community structure in the South China Sea in response to the East Asian aerosol input

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