气候变化领域集成服务门户(CCPortal): Effect of deep Southwestern Subtropical Atlantic Ocean circulation on the biogeochemistry of mercury during the last two glacial/interglacial cycles

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DOI	10.1016/j.quascirev.2020.106368
	Effect of deep Southwestern Subtropical Atlantic Ocean circulation on the biogeochemistry of mercury during the last two glacial/interglacial cycles
	Figueiredo T.S.; Santos T.P.; Costa K.B.; Toledo F.; Albuquerque A.L.S.; Smoak J.M.; Bergquist B.A.; Silva-Filho E.V.
发表日期	2020
ISSN	0277-3791
卷号	239
英文摘要	During glacial/interglacial cycles, changes in the strength of the Atlantic Meridional Overturning Circulation (AMOC) modified the intermediate and deep-water mass proportions and high latitude productivity in the Atlantic Ocean. These factors influence the distribution and geochemical partitioning of trace metals in the ocean. Mercury is a redox and productivity-sensitive trace metal, making it a potential proxy of paleoenvironmental changes. Therefore, this work examines the effect of Atlantic Ocean circulation changes during the last two glacial/interglacial cycles on the biogeochemistry of Hg. For this, a high-resolution record of the total Hg concentration was determined in core GL-1090 collected from the Southwestern Subtropical Atlantic that represents the last 185 thousand years. During the reported glacial/interglacial cycles, Hg showed a distinct trend throughout Marine Isotope Stages with higher concentrations during periods of enhanced penetration of northern component water into the southwestern Atlantic. This is supported by the similarity of mercury variability with benthic foraminifera δ13C, suggesting a strong influence of deep ocean circulation on the availability and accumulation of this metal in deep-sea sediments. Mercury geochemistry and particle scavenging were correlated with organic matter (OM) input at the core site. We also noted that mercury responded to redox variation in sediment after Termination II, which can be explained by the increase in deep ocean ventilation due to AMOC strengthening. This hypothesis was confirmed by the antiphase behavior of Hg and Total Organic Carbon when compared with Mn/Al ratios and CaCO3. Our work, therefore, allows for a better understanding of the processes leading to long-term mercury removal to sediments. © 2020 Elsevier Ltd
英文关键词	Atlantic meridional overturning circulation; Calcium carbonate.dissolution; Mercury concentration; Organic matter remineralization; Paleoproductivity
语种	英语
scopus关键词	Biogeochemistry; Calcite; Calcium carbonate; Glacial geology; Mercury (metal); Organic carbon; Productivity; Sediments; Trace elements; Tropics; Atlantic meridional overturning circulations; Deep-ocean circulation; Enhanced penetration; Geochemical partitioning; Marine isotope stages; Paleoenvironmental change; Southwestern Atlantic; Total Organic Carbon; Oceanography; benthic foraminifera; biogeochemistry; concentration (composition); deep-sea sediment; glacial environment; hypothesis testing; marine isotope stage; mercury (element); organic matter; pollutant removal; Atlantic Ocean; Atlantic Ocean (Subtropical); Foraminifera
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151444
作者单位	Geoscience (Geochemistry) Graduate Program (Environmental Geochemistry), Fluminense Federal University, Niterói, 24020-141, Brazil; Laboratório de Paleoceanografia do Atlântico Sul, Instituto Oceanográfico, Universidade de São Paulo, Praça do Oceanográfico, 191 Cidade Universitária, São Paulo, SP CEP 05508-120, Brazil; School of Geosciences, University of South Florida, Florida, 33701, United States; Department of Earth Sciences, University of Toronto, Toronto, ON M5S 3B1, Canada
推荐引用方式 GB/T 7714	Figueiredo T.S.,Santos T.P.,Costa K.B.,et al. Effect of deep Southwestern Subtropical Atlantic Ocean circulation on the biogeochemistry of mercury during the last two glacial/interglacial cycles[J],2020,239.
APA	Figueiredo T.S..,Santos T.P..,Costa K.B..,Toledo F..,Albuquerque A.L.S..,...&Silva-Filho E.V..(2020).Effect of deep Southwestern Subtropical Atlantic Ocean circulation on the biogeochemistry of mercury during the last two glacial/interglacial cycles.Quaternary Science Reviews,239.
MLA	Figueiredo T.S.,et al."Effect of deep Southwestern Subtropical Atlantic Ocean circulation on the biogeochemistry of mercury during the last two glacial/interglacial cycles".Quaternary Science Reviews 239(2020).