气候变化领域集成服务门户(CCPortal): Paleoclimatic controls on mercury deposition in northeast Brazil since the Last Interglacial

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DOI	10.1016/j.quascirev.2019.105869
	Paleoclimatic controls on mercury deposition in northeast Brazil since the Last Interglacial
	Fadina O.A.; Venancio I.M.; Belem A.; Silveira C.S.; Bertagnolli D.D.C.; Silva-Filho E.V.; Albuquerque A.L.S.
发表日期	2019
ISSN	0277-3791
卷号	221
英文摘要	The sediment core GL-1248, collected from the continental slope off northeastern Brazil, was used to reconstruct mercury (Hg) variations in NE South American continental margin and understand its variability in response to paleoclimate changes over the past 128 ka. Mercury concentrations in GL-1248 ranged between 14.95 and 69.43 ng/g, showing a glacial-interglacial pattern with higher (lower) concentrations in the glacial period (interglacial period). Parallel trends of Hg and XRF-Fe plots suggest that following atmospheric Hg deposition onto the continent, Hg is incorporated with Fe compounds before transportation and eventual immobilization at the NE Brazil continental slope. Peaks of Hg and Fe/Ca ratio peaks occurred concurrently during certain Heinrich Stadials, indicating that Hg is transported from the continent alongside fluvial sediments during periods of increased precipitation and erosion in NE Brazil continent. Mercury concentrations varied with periodicities of 56 ka and 900 yr suggesting glacial-interglacial changes and millennial-scale variability, respectively. Total Hg and total organic carbon are poorly correlated, although the latter likely influenced Hg sequestration into marine sediments during millennial-scale events between 60 ka and 30 ka. Altogether, our results suggest that the atmosphere is the primary source of Hg to GL-1248 and glacial-interglacial climate variations were the major determinant of atmospheric Hg deposition. Furthermore, increased precipitation during millennial-scale events played a secondary role by enhancing Hg transport to the continental slope of NE Brazil. © 2019
英文关键词	Glacial/interglacial climate; Marine sediments; Mercury variations; Millennial-scale events; Northeastern Brazil; South American continental margin
语种	英语
scopus关键词	Deposition; Iron compounds; Organic carbon; Sediments; Submarine geology; Continental margin; Glacial/interglacial climate; Marine sediments; Millennial-scale events; Northeastern Brazil; Glacial geology; atmospheric deposition; climate variation; continental margin; continental slope; glacial-interglacial cycle; Heinrich event; Last Interglacial; marine sediment; mercury (element); paleoclimate; precipitation (climatology); sediment core; total organic carbon
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/151779
作者单位	Department of Geochemistry, Federal Fluminense University, Outeiro São João Baptista s/n. - Centro, Niteroi, 24020-141, Brazil; Center for Weather Forecasting and Climate Studies (CPTEC), National Institute for Space Research (INPE), Cachoeira Paulista, Brazil; Oceanographic Observatory, Federal Fluminense University, Passo da Pátria, 156 block E room 300, Praia Vermelha Campus - São Domingos, Niteroi, 24210-240, Brazil; Department of Chemistry, Federal Fluminense University, Rua Desembargador Hermídio Ellys Figuieira, 783 Aterrado, 27.213-145, Volta Redonda, RJ, Brazil
推荐引用方式 GB/T 7714	Fadina O.A.,Venancio I.M.,Belem A.,et al. Paleoclimatic controls on mercury deposition in northeast Brazil since the Last Interglacial[J],2019,221.
APA	Fadina O.A..,Venancio I.M..,Belem A..,Silveira C.S..,Bertagnolli D.D.C..,...&Albuquerque A.L.S..(2019).Paleoclimatic controls on mercury deposition in northeast Brazil since the Last Interglacial.Quaternary Science Reviews,221.
MLA	Fadina O.A.,et al."Paleoclimatic controls on mercury deposition in northeast Brazil since the Last Interglacial".Quaternary Science Reviews 221(2019).