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Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years

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dc.contributor.author de Lacerda, L. D.
dc.contributor.author Turcq, B.
dc.contributor.author Sifeddine, A.
dc.contributor.author Cordeiro, R. C.
dc.date.accessioned 2019-01-25T16:36:28Z
dc.date.available 2019-01-25T16:36:28Z
dc.date.issued 2017
dc.identifier.uri https://hdl.handle.net/20.500.12866/4843
dc.description.abstract Total Hg, TC, TN, goethite and siderite distributions in sediment cores from two locations across Caco) Lake (Brazil) identified paleoclimate factors that had affected the Hg deposition in this shallow tropical lake and its relationship with past climate and basin processes. Concentrations and fluxes of Hg were maximum in the Last Glacial Maximum (LGM), with averages of 397 ng g(-1), and 24.3 mu g m(-2) yr(-1), respectively, decreasing during the Heinrich Stadial 1 (H1) and further during the Meltwater pulse 1A (MWP-1A). The higher values during LGM and H1 were strongly associated with dust deposition as observed in Greenland ice cores. After a period of lower values, there was a significant increase of concentrations and fluxes during the Younger Dryas (193 ng g(-1) and 4.1 mu g m(-2) yr(-1)), still associated in part with dust deposition but also being influenced by the high volcanic activity of this period. Concentrations and fluxes decreased again to the lowest values during the Holocene from about 9500 to 2000 cal yr BP (114 ng g(-1) and 1.25 mu g m(-2) yr(-1)). Analyses of Pb-210 dated shorter cores shows increasing Hg accumulation rates during the past century, larger than in other period in the past but could not evidence the influence of colonial gold mining as suggested by earlier studies. en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartof urn:issn:1873-0647
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject amazon en_US
dc.subject deposition en_US
dc.subject climate en_US
dc.subject alta floresta en_US
dc.subject antarctica en_US
dc.subject atmospheric mercury en_US
dc.subject Deposition en_US
dc.subject emissions en_US
dc.subject Geology en_US
dc.subject greenland ice core en_US
dc.subject Mercury en_US
dc.subject northern brazil en_US
dc.subject Paleoclimate en_US
dc.subject record en_US
dc.subject Tropical lake en_US
dc.title Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.jsames.2017.04.008
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#3.02.00 es_PE

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