Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01)

Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01)
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北大西洋和拉布拉多海沿 GEOVIDE 剖面的溶解铁(GEOTRACES 剖面 GA01)

DOI:
10.5194/bg-17-917-2020
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发表时间:
2020
期刊:
影响因子:
4.9
通讯作者:
G. Sarthou
G. Sarthou
中科院分区:
地球科学2区
文献类型:
--
作者:
Manon Tonnard;H. Planquette;A. Bowie;P. van der Merwe;M. Gallinari;Floriane Desprez de Gésincourt;Y. Germain;Arthur Gourain;M. Benetti;G. Reverdin;P. Tréguer;Julia Boutorh;M. Cheize;F. Lacan;Jan‐Lukas Menzel Barraqueta;Leonardo Pereira;R. Shelley;P. Lherminier;G. Sarthou

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抽象的。使用北大​​西洋 GEOVIDE 航行(GEOTRACES GA01,2014 年 5 月至 6 月)的溶解铁 (DFe) 样品进行了分析 seaFAST-pico™ 与 Element XR 扇形场耦合 电感耦合等离子体质谱仪 (SF-ICP-MS) 并提供了有趣的 深入了解该地区的铁来源。总体而言,DFe 浓度范围 从 0.09±0.01 到 7.8±0.5 nmol L−1。 在伊比利亚、格陵兰和海平面上观察到 DFe 浓度升高 纽芬兰的利润可能是由于塔霍河的河流输入, 大气水输入和沉积物输入。深冬对流 去年冬天发生的铁与硝酸盐的比例足以 维持浮游植物生长并导致 DFe 相对升高 伊尔明格海地下水域的浓度。增加DFe 拉布拉多海水流动路径上的浓度归因于 来自纽芬兰边缘的沉积输入。底层水域来自 厄明格海显示出高 DFe 浓度,可能是由于溶解所致 丹麦海峡溢流水和极地中的富铁颗粒 中级水。最后,霞云层位于不同的 盆地和伊比利亚边缘被发现既可以作为源头,也可以作为 DFe 的汇取决于颗粒的性质,其中有有机颗粒 可能释放DFe和清除DFe的Mn颗粒。
Abstract. Dissolved Fe (DFe) samples from the GEOVIDE voyage (GEOTRACES GA01, May–June 2014) in the North Atlantic Ocean were analyzed using a seaFAST-pico™ coupled to an Element XR sector field inductively coupled plasma mass spectrometer (SF-ICP-MS) and provided interesting insights into the Fe sources in this area. Overall, DFe concentrations ranged from 0.09±0.01 to 7.8±0.5 nmol L−1. Elevated DFe concentrations were observed above the Iberian, Greenland, and Newfoundland margins likely due to riverine inputs from the Tagus River, meteoric water inputs, and sedimentary inputs. Deep winter convection occurring the previous winter provided iron-to-nitrate ratios sufficient to sustain phytoplankton growth and lead to relatively elevated DFe concentrations within subsurface waters of the Irminger Sea. Increasing DFe concentrations along the flow path of the Labrador Sea Water were attributed to sedimentary inputs from the Newfoundland Margin. Bottom waters from the Irminger Sea displayed high DFe concentrations likely due to the dissolution of Fe-rich particles in the Denmark Strait Overflow Water and the Polar Intermediate Water. Finally, the nepheloid layers located in the different basins and at the Iberian Margin were found to act as either a source or a sink of DFe depending on the nature of particles, with organic particles likely releasing DFe and Mn particle scavenging DFe.
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