Article

Iron biogeochemistry across marine systems – progress from the past decade

Biogeosciences (Impact Factor: 3.75). 01/2010; DOI: 10.5194/bg-7-1075-2010
Source: DOAJ

ABSTRACT Based on an international workshop (Gothenburg, 14–16 May 2008), this review article aims to combine interdisciplinary knowledge from coastal and open ocean research on iron biogeochemistry. The major scientific findings of the past decade are structured into sections on natural and artificial iron fertilization, iron inputs into coastal and estuarine systems, colloidal iron and organic matter, and biological processes. Potential effects of global climate change, particularly ocean acidification, on iron biogeochemistry are discussed. The findings are synthesized into recommendations for future research areas.

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Available from: Martha Gledhill, Aug 18, 2015
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    • "Iron limitation controls biological productivity in 30 % of the world's oceans (Ardelan and Steinnes 2010); therefore, assessing the potential effects of OA on iron biogeochemistry is crucial. Millero et al. (2009) showed that a decrease in pH from 8.1 to 7.4 will increase the solubility of Fe(III) by approximately 40 %, whilst Breitbarth et al. (2010) showed a similar pH decrease could cause a 10-fold increase in the half-life of Fe(II). In comparison, other studies have suggested that the bioavailability of iron will decrease under acidified conditions (Martin and Fitzwater 1988; Shi et al. 2010). "
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    • "In addition, terrestrially derived humic substances apparently play a major role as chelators for iron and other trace metals (Laglera and van den Berg 2009) in the marine environment. This holds true especially for high nutrient low chlorophyll (HNLC) areas where iron limits primary production (Breitbarth et al. 2010). The Tanner Moor, a pristine submountainous raised peat bog in Lower Austria, releases water with elevated NOM and iron content (Krachler et al. 2005). "
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    ABSTRACT: Samples from a pristine raised peat bog runoff in Austria, the Tannermoor creek, were analysed for their iron linked to natural organic matter (NOM) content. Dissolved organic carbon < 0.45 μm (DOC) was 41-64 mg L(-1), iron 4.4-5.5 mg L(-1). Samples were analysed applying asymmetric field flow fractionation (AsFlFFF) coupled to UV-vis absorption, fluorescence and inductively coupled plasma mass spectrometry (ICP-MS). The samples showed an iron peak associated with the NOM peak, one sample exhibiting a second peak of iron independent from the NOM peak. As highland peat bogs with similar climatic conditions and vegetation to the Tanner Moor are found throughout the world, including areas adjacent to the sea, we examined the behaviour of NOM and iron in samples brought to euhaline (35‰) conditions with artificial sea salt. The enhanced ionic strength reduced NOM by 53% and iron by 82%. Size exclusion chromatography (SEC) of the samples at sea-like salinity revealed two major fractions of NOM associated with different iron concentrations. The larger one, eluting sharply after the upper exclusion limits of 4000-5000 g mol(-1), seems to be most important for iron chelating. The results outline the global importance of sub-mountainous and mountainous raised peat bogs as a source of iron chelators to the marine environment at sites where such peat bogs release their run-offs into the sea.
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    • "We follow the structure of the workshop topics, which were: Natural Fe fertilization (Sect. 2, articles: Ardelan et al., 2010; Chever et al., 2010; Duggen et al., 2010; Ye et al., 2009); artificial Fe fertilization (3: Bucciarelli et al., 2010; Chever et al., 2010); Fe inputs into coastal and estuarine systems (4: Gelting et al., 2009; Breitbarth et al., 2009); Colloidal iron and organic matter (5); Linking biological processes to iron chemistry (6: Breitbarth et al., 2009; Bucciarelli et al., 2010; Hassler and Schoemann, 2009; Steigenberger et al., 2010); and Iron and Climate Change (7: Breitbarth et al., 2010; Rose et al., 2009). Each section concludes with recommendations for future re- search. "
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    ABSTRACT: Based on an international workshop (Gothenburg, 14–16 May 2008), this review article aims to combine interdisciplinary knowledge from coastal and open ocean research on iron biogeochemistry. The major scientific findings of the past decade are structured into sections on natural and artificial iron fertilization, iron inputs into coastal and estuarine systems, colloidal iron and organic matter, and biological processes. Potential effects of global climate change, particularly ocean acidification, on iron biogeochemistry are discussed. The findings are synthesized into recommendations for future research areas.
    Biogeosciences 01/2010; DOI:10.5194/bg-7-1075-2010 · 3.75 Impact Factor
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