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

被引：0

作者：

Olivelli, Arianna ^{[1
,2
]}

Paul, Maxence ^{[2
]}

Xu, Hui ^{[2
]}

Kreissig, Katharina ^{[2
]}

Coles, Barry J. ^{[2
]}

Moore, Rebekah E. T. ^{[2
]}

Bridgestock, Luke ^{[3
]}

Rijkenberg, Micha ^{[4
]}

Middag, Rob ^{[4
,5
]}

Lohan, Maeve C. ^{[6
]}

Weiss, Dominik J. ^{[2
]}

Rehkamper, Mark ^{[2
]}

van de Flierdt, Tina ^{[2
]}

机构：

[1] Imperial Coll London, Grantham Inst Climate Change & Environm, South Kensington Campus, London SW7 2AZ, England

[2] Imperial Coll London, Dept Earth Sci & Engn, South Kensington Campus, London SW7 2AZ, England

[3] Univ St Andrews, Sch Earth & Environm Sci, Bute Bldg,Queens Terrace, St Andrews KY16 9TS, Scotland

[4] NIOZ Royal Netherlands Inst Sea Res, Dept Ocean Syst, POB 59, NL-1790 AB Den Burg, Netherlands

[5] Univ Groningen, Ctr Isotope Res Oceans, POB 72, NL-9700 AB Groningen, Netherlands

[6] Univ Southampton, Natl Oceanog Ctr, Ocean & Earth Sci, Southampton SO14 3ZH, England

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 2024年 / 646卷

基金：

英国自然环境研究理事会;

关键词：

Lead isotopes; Scavenging; Seawater; Pollution; GEOTRACES; NORTH-ATLANTIC; ISOTOPE COMPOSITIONS; DISSOLVED ZINC; PB ISOTOPES; DEEP WATERS; PB-210; PARTICULATE; CIRCULATION; PACIFIC; PO-210;

D O I：

10.1016/j.epsl.2024.118980

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

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 similar to 40 degrees 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.

引用

页数：15

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