Vertical transport of anthropogenic lead by reversible scavenging in the South Atlantic Ocean

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters Pub Date : 2024-09-19 DOI:10.1016/j.epsl.2024.118980

Arianna Olivelli , Maxence Paul , Hui Xu , Katharina Kreissig , Barry J. Coles , Rebekah E.T. Moore , Luke Bridgestock , Micha Rijkenberg , Rob Middag , Maeve C. Lohan , Dominik J. Weiss , Mark Rehkämper , Tina van de Flierdt

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Abstract

Stable lead (Pb) isotopes have been regarded as tracers of ocean circulation, both in the present time and geological past. Here we present a new dataset of seawater Pb concentrations and isotope compositions for ten depth profiles from the South Atlantic Ocean (GEOTRACES cruises GA02 and GA10). By comparing Pb isotope data collected on the two cruises, and by modelling the distribution of Pb with an extended optimum multiparameter analysis, we find evidence of vertical transport of anthropogenic Pb pollution due to reversible scavenging. Surface to depth transfer of polluted Pb is aided by high suspended particulate matter loads at the Brazil – Malvinas Confluence and along ∼40°S in the South Atlantic. Overall, our findings caution the use of Pb isotope ratios as ventilation tracers in the South Atlantic and emphasize the importance of particle-seawater interaction for biogeochemical cycles.

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南大西洋人为铅的可逆清除垂直迁移

稳定的铅（Pb）同位素一直被认为是海洋环流的示踪剂，无论是现在还是地质过去。在这里，我们展示了南大西洋（GEOTRACES GA02 和 GA10 巡航）10 个深度剖面的海水铅浓度和同位素组成的新数据集。通过比较两次巡航收集到的铅同位素数据，并利用扩展的最优多参数分析建立铅分布模型，我们发现了人为铅污染因可逆清扫作用而垂直迁移的证据。巴西-马尔维纳斯群岛交汇处和南大西洋南纬 40 度沿线的高悬浮颗粒物负荷有助于污染铅从海面向深海的迁移。总之，我们的研究结果提醒人们谨慎使用铅同位素比值作为南大西洋的通风示踪剂，并强调了颗粒-海水相互作用对生物地球化学循环的重要性。

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来源期刊

Earth and Planetary Science Letters 地学-地球化学与地球物理

CiteScore

10.30

自引率

5.70%

发文量

475

审稿时长

2.8 months

期刊介绍： Earth and Planetary Science Letters (EPSL) is a leading journal for researchers across the entire Earth and planetary sciences community. It publishes concise, exciting, high-impact articles ("Letters") of broad interest. Its focus is on physical and chemical processes, the evolution and general properties of the Earth and planets - from their deep interiors to their atmospheres. EPSL also includes a Frontiers section, featuring invited high-profile synthesis articles by leading experts on timely topics to bring cutting-edge research to the wider community.