@Article{FadinaVeBeSiBeSiAl:2019:PaCoMe,
author = "Fadina, Omotayo Anuoluwapo Fadina and Ven{\^a}ncio, Igor Martins
and Bel{\'e}m, Andr{\'e} and Silveira, Carla Semiramis and
Bertagnolli, Denise de Castro and Silva Filho, Emmanoel Vieira and
Albuquerque, Ana Luiza S.",
affiliation = "{Universidade Federal Fluminense (UFF)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Universidade Federal Fluminense
(UFF)} and {Universidade Federal Fluminense (UFF)} and
{Universidade Federal Fluminense (UFF)} and {Universidade Federal
Fluminense (UFF)} and {Universidade Federal Fluminense (UFF)}",
title = "Paleoclimatic controls on mercury deposition in northeast Brazil
since the Last Interglacial",
journal = "Quaternary Science Reviews",
year = "2019",
volume = "221",
pages = "105869",
month = "Oct.",
keywords = "Mercury variationsMarine sediments, Glacial/interglacial climate,
Millennial-scale events, South American continental margin,
Northeastern Brazil.",
abstract = "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.",
doi = "10.1016/j.quascirev.2019.10586",
url = "http://dx.doi.org/10.1016/j.quascirev.2019.10586",
issn = "0277-3791",
language = "en",
targetfile = "fadina_paleoclimatic.pdf",
urlaccessdate = "27 abr. 2024"
}