南极冰川向南大洋表面输出富含碳稳定铁(II)的颗粒

IF 15.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Rhiannon L. Jones, Jon R. Hawkings, Michael P. Meredith, Maeve C. Lohan, Oliver W. Moore, Robert M. Sherrell, Jessica N. Fitzsimmons, Majid Kazemian, Tohru Araki, Burkhard Kaulich, Amber L. Annett
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引用次数: 0

摘要

铁是浮游植物必需的微量营养素,在海洋碳循环中起着不可或缺的作用。因此,铁的供应和生物利用度是冰期-间冰期旋回期间气候的重要调节因子。来自南极大陆架的铁的输入缓解了南大洋的铁限制,推动了生产力热点。冰川融水通量可以输送大量颗粒铁。在这里,我们表明冰川融水向南极大陆架表面海洋提供了富含铁(II)的颗粒。据了解,颗粒铁(II)对浮游植物的生物可利用性更高,但在含氧海水中的稳定性不如铁(III)。通过x射线显微镜,我们发现富铁相和富有机碳相共存,这表明有机碳阻碍了含氧海水中潜在生物可利用的铁(II)的氧化。加速的融水通量可能为南极表层海洋提供一个日益重要的富含铁(II)的生物可利用颗粒来源,对南大洋碳泵和生态系统生产力产生影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Antarctic glaciers export carbon-stabilised iron(II)-rich particles to the surface Southern Ocean

Antarctic glaciers export carbon-stabilised iron(II)-rich particles to the surface Southern Ocean

Iron is an essential micronutrient for phytoplankton and plays an integral role in the marine carbon cycle. The supply and bioavailability of iron are therefore important modulators of climate over glacial-interglacial cycles. Inputs of iron from the Antarctic continental shelf alleviate iron limitation in the Southern Ocean, driving hotspots of productivity. Glacial meltwater fluxes can deliver high volumes of particulate iron. Here, we show that glacier meltwater provides particles rich in iron(II) to the Antarctic shelf surface ocean. Particulate iron(II) is understood to be more bioavailable to phytoplankton, but less stable in oxic seawater, than iron(III). Using x-ray microscopy, we demonstrate co-occurrence of iron and organic carbon-rich phases, suggesting that organic carbon retards the oxidation of potentially-bioavailable iron(II) in oxic seawater. Accelerating meltwater fluxes may provide an increasingly important source of bioavailable iron(II)-rich particles to the Antarctic surface ocean, with implications for the Southern Ocean carbon pump and ecosystem productivity.

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来源期刊
Nature Communications
Nature Communications Biological Science Disciplines-
CiteScore
24.90
自引率
2.40%
发文量
6928
审稿时长
3.7 months
期刊介绍: Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.
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