The biogeochemistry of zinc and cadmium in the Amundsen Sea, coastal Antarctica
The biogeochemistry of zinc and cadmium in the Amundsen Sea, coastal Antarctica
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南极洲沿海阿蒙森海中锌和镉的生物地球化学
DOI：
10.1016/j.marchem.2023.104223
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发表时间：
2023
期刊：
影响因子：
3
通讯作者：
Reichart, Gert-Jan
中科院分区：
文献类型：
--
作者：
Tian, Hung-An;van Manen, Mathijs;Wille, Flora;Jung, Jinyoung;Lee, SangHoon;Kim, Tae-Wan;Aoki, Shigeru;Eich, Charlotte;Brussaard, Corina P.D.;Reichart, Gert-Jan
微量金属锌（Zn）和镉（Cd）参与海洋浮游植物的代谢过程，在海洋生态地球化学循环中起着重要作用。在南极洲，阿蒙森海（AS）经历了快速的冰架融化，阿蒙森海冰间湖（ASP）在南半球的夏季举办季节性浮游植物水华，对大气二氧化碳的下降具有重要意义。然而，冰融化和浮游植物水华对ASP中Zn和Cd的生态地球化学和分布的影响仍然缺乏研究。在这里，我们提出了第一个组合数据集的溶解和颗粒锌和镉的AS（包括流入和流出的Dotson和Getz冰架）收集的GEOTRACES过程研究GPPR12的一部分。我们使用这个数据集来评估这两个元素的AS区域的来源，并在ASP的颗粒组成的特征。我们发现，溶解的锌和镉在AS的主要来源是绕极深水（CDW），与额外的小通量的两种金属从陆架沉积物。相比之下，气溶胶沉积，冰架融化，海冰融化都被认为是微不足道的来源，无论是锌或镉的AS。不稳定的颗粒Zn和Cd占主导地位的总颗粒池中的表层，表明生物吸收是一个主要的过程中的ASP的两种金属的循环，而沉积物再悬浮和冰架融化不提供一个显着的量的颗粒Zn或Cd。此外，我们使用两种常用的方法来估计生物和岩性颗粒物的浓度。我们发现高生物颗粒浓度在表面，随深度降低，表明矿化颗粒金属的循环中起着重要的作用。相反，成岩颗粒金属浓度在整个水柱中保持较低。我们还表明，锌和镉相对于磷酸盐在表层的估计吸收率低于报告的开放的南大洋，可能与空间和时间的变化，铁在AS。总的来说，这些新的观测提供了深入了解锌和镉的地球化学在AS，一个地区，是受快速气候变化的影响，这可能会对大规模的微量金属循环在南大洋的影响。具体而言，锌和镉的量提供给表面ASP将增加，鉴于CDW的体积流向Dotson冰架预计将增加。
The trace metals zinc (Zn) and cadmium (Cd) are both involved in the metabolic processes of marine phytoplankton, and as such, both metals play important roles in ocean biogeochemical cycles. In Antarctica, the Amundsen Sea (AS) experiences rapid ice shelf melting, and the Amundsen Sea polynya (ASP) hosts seasonal phytoplankton blooms in austral summer, with important implications for atmospheric carbon dioxide drawdown. However, the effects of ice melting and phytoplankton blooms on the biogeochemistry and distributions of Zn and Cd in the ASP remain poorly studied. Here, we present the first combined dataset of dissolved and particulate Zn and Cd in the AS (including the inflow and outflow to and from the Dotson and Getz ice shelves) collected as part of the GEOTRACES process study GPpr12. We use this dataset to assess the sources of both elements to the AS region and characterize the particle composition in the ASP. We find that the main source of both dissolved Zn and Cd in the AS is Circumpolar Deep Water (CDW), with an additional small flux of both metals from shelf sediments. By contrast, aerosol deposition, ice shelf melt, and sea ice melt are all deemed insignificant sources for either Zn or Cd in the AS. Labile particulate Zn and Cd dominate the total particulate pool in the surface layer, indicating that biological uptake is a predominant process for the cycling of both metals in the ASP, whereas sediment resuspension and ice shelf melt do not supply a significant amount of either particulate Zn or Cd. Additionally, we use two commonly used approaches to estimate biogenic and lithogenic particulate concentrations. We find high biogenic particulate concentrations at the surface, decreasing with depth, indicating remineralization plays an important role in the cycling of particulate metals. In contrast, lithogenic particulate metal concentrations remain low throughout the water column. We also show that the estimated uptake ratios of Zn and Cd relative to phosphate in the surface layer are lower than reported for the open Southern Ocean, likely related to the spatial and temporal variability of Fe in the AS. Overall, these new observations provide insight into the biogeochemistry of both Zn and Cd in the AS, a region that is subject to the influence of rapid climate change, which may have implications for the larger-scale cycling of trace metals in the Southern Ocean. Specifically, the amount of Zn and Cd supplied to the surface ASP will increase, given that the volume of CDW that flows towards the Dotson Ice Shelf is predicted to increase.
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DOI：
10.1038/s41396-021-01084-9
发表时间：
2022-03
期刊：
The ISME journal
影响因子：
--
作者：
McCain JSP;Allen AE;Bertrand EM
通讯作者：
Bertrand EM
DOI：
10.4319/lom.2012.10.367
发表时间：
2012-05
期刊：
Limnology and Oceanography: Methods
影响因子：
--
作者：
H. Planquette;R. Sherrell
通讯作者：
H. Planquette;R. Sherrell
包括食人鱼在内的海洋颗粒消化的实验室比对：一种溶解聚醚砜过滤器的新型化学方法
DOI：
--
发表时间：
2014
期刊：
影响因子：
--
作者：
D. Ohnemus;M. Auro;R. Sherrell;Maria Lagerström;P. Morton;B. Twining;Sara Rauschenberg;P. Lam
通讯作者：
P. Lam
影响因子：
3
作者：
Lannuzel, Delphine;Schoemann, Veronique;Chou, Lei
通讯作者：
Chou, Lei
“冰川融化中的铁为阿蒙森海（南大洋）浮游植物的繁殖提供燃料：铁生物地球化学”的勘误（Gerringa 等人，2012 年）
DOI：
--
发表时间：
2020
期刊：
影响因子：
--
作者：
L. Gerringa;A. Alderkamp;P. Laan;Charles;H. Baar;M. Mills;G. V. Dijken;H. Haren;K. Arrigo
通讯作者：
K. Arrigo