Glacial flours as a potential source of Fe(II) and Fe(III) to polar waters

Glacial flours as a potential source of Fe(II) and Fe(III) to polar waters
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冰川粉是极地水域 Fe(II) 和 Fe(III) 的潜在来源

DOI:
10.1007/s10533-013-9945-y
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发表时间:
2014
期刊:
影响因子:
4
通讯作者:
Hopwood M
Hopwood M
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Hopwood M

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铁供应高硝酸盐低叶绿素(HNLC)的沃茨,如南大洋,是初级生产和相关的碳吸收的主要限制因素。冰川融水最近已被证明提供了一个全球性的大量输入铁的南极和北极极地沃茨。冰川径流中的颗粒铁通量比溶解铁通量大几个数量级,但迄今为止,人们对这种颗粒铁的潜在生物利用度知之甚少。一小部分颗粒铁可能是生物可利用的生物体,从而对生物区系在HNLC区有显着的影响。在这里,我们详细描述了从四个不同的冰川粉释放的铁的组成和形态。我们发现,不稳定铁的分数在不同的面粉之间变化显着,并不成比例的总铁。此外,一小部分颗粒状Fe可用于Fe(II)选择性配体亚铁嗪,这表明在面粉表面上的活性氧化还原循环。
Supply of Fe to high nitrate low chlorophyll (HNLC) waters, such as the Southern Ocean, is the principle limiting factor for primary production and the associated carbon uptake. Glacial meltwaters have recently been shown to provide a globally substantial input of Fe to both Antarctic and Arctic polar waters. The particulate Fe flux in glacial runoff is several orders of magnitude greater than the dissolved Fe flux and yet little is known, to date, about the potential bioavailability of this particulate Fe. A fraction of particulate Fe may be bioavailable to organisms and thus have a significant impact on biota in HNLC zones. Here, we describe in detail the composition and speciation of Fe released from four different glacial flours. We show that the fraction of labile Fe varies markedly between different flours and is not proportional to total Fe. Furthermore a small fraction of the particulate Fe is available to the Fe(II) selective ligand ferrozine, which indicates active redox cycling on the surface of the flour.
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