Contribution of cryoconite holes in the supraglacial discharge of bioavailable iron in Larsemann Hills, East Antarctica

IF 1.5 4区 地球科学 Q3 ECOLOGY
G. Samui , A. Sanyal , R. Antony , C.M. Laluraj , M. Thamban
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Abstract

Supraglacial discharge of limiting micronutrients such as iron (Fe) into high-nutrient low-chlorophyll (HNLC) regions like the Southern Ocean has recently drawn global attention. In this study, we aim to understand the contribution of cryoconite holes (comprising a meltwater column with an underlying layer of sediment) to the discharge of Fe through the glacier runoff. Cryoconite hole meltwater collected from the Larsemann Hills, East Antarctica showed a higher concentration of dissolved Fe (dFe: 71.2 μgL−1) and total Fe extractable from suspended sediments (exFe: 362.1 μgL−1) than in the adjacent streams (dFe: 30.5 μgL−1; exFe: 21.2 μgL−1) and melt pools (dFe: 42.3 μgL−1; exFe: 5.8 μgL−1). Predictive pathways (using PICRUSt2) show that cryoconite hole bacterial communities could acquire Fe and other trace elements using different mechanisms, such as the biosynthesis of siderophores, and transport proteins, therefore influencing the trace metal chemistry in these and other environments that drain cryoconite hole contents. Estimated discharge of dFe (11.4 kg km−2 a−1) and exFe (57.9 kg km−2 a−1) within cryoconite holes are 2 and 17 times higher, respectively than the discharge from the adjacent supraglacial streams, indicating that cryoconite holes are an important source of potentially bioavailable Fe to the HNLC region.

南极洲东部拉尔斯曼丘陵冰川上生物可利用铁的排放中冰川洞的贡献
向南大洋等高营养低叶绿素(HNLC)地区排放铁(Fe)等限制性微量营养元素的超冰川现象最近引起了全球关注。在这项研究中,我们旨在了解冰川洞(由带底层沉积物的融水柱组成)对通过冰川径流排放铁的贡献。从南极洲东部拉尔斯曼丘陵采集的冰川洞融水显示,溶解铁(dFe:71.2 μgL-1)和可从悬浮沉积物中提取的总铁(exFe:362.1 μgL-1)的浓度高于邻近溪流(dFe:30.5 μgL-1;exFe:21.2 μgL-1)和融池(dFe:42.3 μgL-1;exFe:5.8 μgL-1)。预测路径(使用 PICRUSt2)表明,冰冻岩洞细菌群落可以通过不同的机制获得铁和其他微量元素,如嗜硒物质的生物合成和转运蛋白,从而影响冰冻岩洞及其他排放冰冻岩洞内容物的环境中的微量金属化学性质。据估计,冰晶石洞内的dFe(11.4 kg km-2 a-1)和exFe(57.9 kg km-2 a-1)排放量分别是邻近超冰川溪流排放量的2倍和17倍,这表明冰晶石洞是HNLC地区潜在生物可利用铁的重要来源。
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来源期刊
Polar Science
Polar Science ECOLOGY-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
3.90
自引率
5.60%
发文量
46
期刊介绍: Polar Science is an international, peer-reviewed quarterly journal. It is dedicated to publishing original research articles for sciences relating to the polar regions of the Earth and other planets. Polar Science aims to cover 15 disciplines which are listed below; they cover most aspects of physical sciences, geosciences and life sciences, together with engineering and social sciences. Articles should attract the interest of broad polar science communities, and not be limited to the interests of those who work under specific research subjects. Polar Science also has an Open Archive whereby published articles are made freely available from ScienceDirect after an embargo period of 24 months from the date of publication. - Space and upper atmosphere physics - Atmospheric science/climatology - Glaciology - Oceanography/sea ice studies - Geology/petrology - Solid earth geophysics/seismology - Marine Earth science - Geomorphology/Cenozoic-Quaternary geology - Meteoritics - Terrestrial biology - Marine biology - Animal ecology - Environment - Polar Engineering - Humanities and social sciences.
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