Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years
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 fluxe...
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ftird:oai:ird.fr:fdi:010070298 2024-09-15T18:09:55+00:00 Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years de Lacerda, L. D. /Turcq, Bruno /Sifeddine, Abdelfettah Cordeiro, R. C. BRESIL CACO LAC 2017 https://www.documentation.ird.fr/hor/fdi:010070298 EN eng https://www.documentation.ird.fr/hor/fdi:010070298 oai:ird.fr:fdi:010070298 de Lacerda L. D., Turcq Bruno, Sifeddine Abdelfettah, Cordeiro R. C. Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years. 2017, 77, p. 42-50 Paleoclimate Tropical lake Deposition Mercury text 2017 ftird 2024-08-15T05:57:41Z 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. Text Greenland Greenland ice cores IRD (Institute de recherche pour le développement): Horizon |
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IRD (Institute de recherche pour le développement): Horizon |
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language |
English |
topic |
Paleoclimate Tropical lake Deposition Mercury |
spellingShingle |
Paleoclimate Tropical lake Deposition Mercury de Lacerda, L. D. /Turcq, Bruno /Sifeddine, Abdelfettah Cordeiro, R. C. Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years |
topic_facet |
Paleoclimate Tropical lake Deposition Mercury |
description |
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. |
format |
Text |
author |
de Lacerda, L. D. /Turcq, Bruno /Sifeddine, Abdelfettah Cordeiro, R. C. |
author_facet |
de Lacerda, L. D. /Turcq, Bruno /Sifeddine, Abdelfettah Cordeiro, R. C. |
author_sort |
de Lacerda, L. D. |
title |
Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years |
title_short |
Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years |
title_full |
Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years |
title_fullStr |
Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years |
title_full_unstemmed |
Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years |
title_sort |
mercury accumulation rates in caco lake, ne brazil during the past 20.000 years |
publishDate |
2017 |
url |
https://www.documentation.ird.fr/hor/fdi:010070298 |
op_coverage |
BRESIL CACO LAC |
genre |
Greenland Greenland ice cores |
genre_facet |
Greenland Greenland ice cores |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010070298 oai:ird.fr:fdi:010070298 de Lacerda L. D., Turcq Bruno, Sifeddine Abdelfettah, Cordeiro R. C. Mercury accumulation rates in Caco Lake, NE Brazil during the past 20.000 years. 2017, 77, p. 42-50 |
_version_ |
1810447531979571200 |