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Özsoy, Türkan; Saydam, A.C.

doi:10.1023/a:1010602026579

Cited by 42 publications

(7 citation statements)

References 71 publications

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“…The most common approach to understanding the delivery of Fe-bearing dust to phytoplankton has been to quantify the solubility of Fe from dust and assume all soluble Fe is also bioavailable, i.e., the amount available for uptake and utilization by living cells [e.g., Özsoy and Saydam, 2001]. However, a major difficulty in assessing the bioavailability of Fe in dust is the lack of consistency in the definition of soluble or bioavailable Fe fractions, making intercomparisons of Fe solubility difficult [Baker and Croot, 2010;Schroth et al, 2009].…”

Section: Methodsmentioning

confidence: 99%

The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica

Winton

Dunbar

Bertler

et al. 2014

Global Biogeochemical Cycles

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Iron is a limiting micronutrient for primary production in the Ross Sea, Antarctica. Recent observations reveal low dissolved Fe (dFe) concentrations in the Ross Sea polynya following high initial rates of primary production in summer, after the dFe winter reserve has been consumed. Significant new sources of dFe are therefore required to further sustain phytoplankton blooms. Iron from aeolian sand and dust (ASD) released from melting sea ice is one potential source. To constrain aeolian Fe inputs, we determined ASD mass accumulation rates and the total and soluble Fe content of ASD on sea ice in McMurdo Sound, southwestern (SW) Ross Sea. The mean mass accumulation rate was~1.5 g m À2 yr À1, total Fe content of this ASD was 4 ± 1 wt %, and the percentage of soluble Fe was 11 ± 1%. Our mean estimate of the bulk aeolian dFe flux of 122.1 μmol m À2 yr À1 for the McMurdo Sound region suggests that aeolian Fe can support between 9.0 × 10 9 and 4.1 × 10 11 mol C yr À1 (0.1-4.9 Tg C yr À1) of new primary production. This equates to only~15% of new primary production in the SW Ross Sea, suggesting that aeolian dFe is a minor component of seasonal Fe supply. The very high ASD accumulation on sea ice in McMurdo Sound compared to other regions of Antarctica suggests that our results represent the upper limit of dFe supply to the ocean from this source in the Ross Sea.

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Section: Methodsmentioning

confidence: 99%

The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica

Winton

Dunbar

Bertler

et al. 2014

Global Biogeochemical Cycles

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“…Ö zsoy and Saydam 110 showed that iron solubility in acid rain moving over Europe and the Mediterranean Sea is ∼56.7% (average pH 4.4), whereas it reaches only 3.32% in red rain (average pH 6.6) originating, according to back-trajectories, in North African mineral dust source zones. Both observed solubilities are governed by the pH dependence and nature of the particles, which act on pH and on the solid-state speciation of iron.…”

Section: Kinetics Of Dissolutionmentioning

confidence: 99%

“…Studies that use filters with membrane pores between 0.4 and 0.5 µm in diameter measure the dissolved plus the colloidal iron. 26,28,78,110,120,142 These measurements correspond to "filtered iron", defined as iron filt ) dissolved iron + colloidal iron. The studies using "ultrafiltration" 35 in addition to a membrane pore diameter of ∼0.025 µm 143 are assumed to measure dissolved iron only.…”

Section: Ironmentioning

confidence: 99%

Transition Metals in Atmospheric Liquid Phases. Sources, Reactivity, and Sensitive Parameters

et al. 2005

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“…Measurements of iron oxidation states in cloud and fog water demonstrate that the ratio Fe(II) to total dissolved Fe can vary considerably between cloud or fog events (0.02-100%) with typical values superior to 50% [1,4,6,16,17]. The distribution of dissolved iron between the two oxidation states is a complex function of sunlight intensity, concentrations of oxidants (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…This FZ method is well adapted to measure the Fe(II) content of wet aerosols or atmospheric waters due to its high sensitivity, high selectivity, and operational lightness in comparison with the other available techniques used for Fe(III) determination in atmospheric waters [5,11,16,17,21]. Compared with other highly sensitive methods using FZ, this quasi-on-line separation does not allow any change in iron redox state and enables the measurement of both Fe(II) and Fe(III).…”

Section: Introductionmentioning

confidence: 99%

In situspeciation of trace Fe(II) and Fe(III) in atmospheric waters by the FZ method coupled to GFAAS analysis

Journet¹,

Desboeufs²,

Sofikitis³

et al. 2007

International Journal of Environmental Analytical Chemistry

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A quasi-on-line method of measurement of the oxidation states of iron coupled with a GFAAS analysis is reported for the trace conditions found in atmospheric waters. This technique is based on the formation of a specific complex [Fe(FZ) 3 ] 4À between Fe(II) and ferrozine (FZ). tC 18 solid-phase extraction cartridges (Sep-Pak) are used to separate the [Fe(FZ) 3 ] 4À and Fe(III) so as to limit the risk of redox evolution of the sample. The adaptation to dilute aqueous media, via acidification at pH ¼ 2 of rainwater sample, and atmospheric interferences are discussed, and the Fe(II) recovery in rainwaters is determined. This method coupled with a quasi-on-line sampling protocol has been tested on rains collected in Guadeloupe Island (Caribbean Sea, 16 N, 61 W) during a field campaign in May 2005. Our results show that the proposed method can satisfactorily be applied to the determination of Fe(II) and Fe(III) in atmospheric waters under in situ conditions.

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Cited by 42 publications

References 71 publications

The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica

The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica

Transition Metals in Atmospheric Liquid Phases. Sources, Reactivity, and Sensitive Parameters

In situspeciation of trace Fe(II) and Fe(III) in atmospheric waters by the FZ method coupled to GFAAS analysis

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