西北太平洋亚热带地区颗粒镉和磷的解耦循环

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Kan Zhang, Kuanbo Zhou, Yihua Cai, Zhongwei Yuan, Yaojin Chen, Feipeng Xu, Xin Liu, Zhimian Cao, Minhan Dai
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引用次数: 0

摘要

为了更好地理解镉和磷生物地球化学循环之间的相互关系,我们根据在北太平洋亚热带环流(NPSG)GEOTRACES 分部巡航(GP09)期间收集的大量数据集,研究了粒径分馏(0.8-51 和 > 51 μm)的镉(Cd)和磷(P)的空间变化。微粒镉(0.06-2.15 pmol L-1)和钾(0.33-10.19 nmol L-1)的浓度随深度的增加而增加,随后又减少,是全球海洋中观测到的最低浓度之一。表明浮游植物镉同化作用的透光层中的大量微粒镉:钾比值显示出很强的地理变异性,在 NPSG 内部平均为 0.05 ± 0.02,而在南部边界为 0.14 ± 0.04 pmol nmol-1。中层沉积区的镉-钾再矿化比与极光区的镉-钾再矿化比具有大致相同的化学计量学关系,即在 NPSG 内部为约 0.05 ± 0.01,而在南部边界为 0.21 ± 0.04 pmol nmol-1。镉钾脱钩反映在元素的垂直分布上,在水体中显示出不同步的变化,这与多个镉池和钾池导致的镉钾差异再矿化一致。小颗粒和大颗粒之间的 Cd-P 关系也有所不同,这表明浮游植物群之间的镉同化以及颗粒动态过程存在差异。我们的研究结果突显了寡营养海洋中镉与磷分馏的复杂过程,并使使用镉作为古磷酸盐替代物变得更加复杂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Decoupled cycling of particulate cadmium and phosphorus in the subtropical Northwest Pacific

We examined the spatial variation in size-fractionated (0.8–51 and > 51 μm) particulate cadmium (Cd) and phosphorus (P) based on a large dataset collected during a GEOTRACES Section cruise (GP09) in the North Pacific Subtropical Gyre (NPSG) to better understand the interrelationship between Cd and P biogeochemical cycles. Concentrations of particulate Cd (0.06–2.15 pmol L−1) and P (0.33–10.19 nmol L−1) showed an initial increase with depth followed by a decrease, and were among the lowest observed in the global ocean. Bulk particulate Cd : P ratios in the euphotic zone, indicative of phytoplankton Cd assimilation, showed strong geographic variability averaging 0.05 ± 0.02 within the NPSG interior vs. 0.14 ± 0.04 pmol nmol−1 at the southern boundary. Cadmium to P remineralization ratio in the mesopelagic zone had a roughly similar stoichiometry as what was produced in the euphotic zone, being ~ 0.05 ± 0.01 in the NPSG interior vs. 0.21 ± 0.04 pmol nmol−1 at the southern boundary. Cd–P decoupling was reflected in the elements' vertical distribution, showing unsynchronized changes through the water column, consistent with Cd–P differential remineralization resulting from multiple Cd and P pools. The Cd–P relationship also differed between small and large particles, suggesting differences in Cd assimilation among phytoplankton assemblages as well as particle dynamic processes. Our results highlight complex processes fractionating Cd from P in the oligotrophic ocean and complicate the use of Cd as a palaeo-phosphate proxy.

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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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