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Flood pulse and spatial dynamics of mercury in sediments in Puruzinho lake, Brazilian Amazon Acta Amazonica
Almeida,Ronaldo de; Bernardi,José Vicente Elias; Oliveira,Ronaldo Cavalcante; Carvalho,Dario Pires de; Manzatto,Angelo Gilberto; Lacerda,Luiz Drude de; Bastos,Wanderley Rodrigues.
The study was conducted in Puruzinho lake (Humaitá, AM) considering seasonal periods of rainy and dry in way to elucidate the flood pulse importance in the deposition, remobilization and distributions of mercury and organic matter in bottom sediments in the Madeira River Basin (Brazilian Amazon). Bottom sediments and soils samples were analyzed for total mercury and organic matter. Mercury concentrations obtained in bottom sediment were 32.20-146.40 ng g-1 and organic matter values were 3.5 - 18.0%. The main region for accumulation of mercury and organic matter was in the central and deepest lake area In the rainy season there was a greater distribution of Hg and organic matter, mainly controlled by means of income of the Madeira river water during...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Organic matter; Indicator kriging; Madeira river; Seasonality.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000100010
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Late quaternary dynamics in the Madeira river basin, southern Amazonia (Brazil), as revealed by paleomorphological analysis Anais da ABC (AABC)
Hayakawa,Ericson H.; Rossetti,Dilce F..
Ancient drainage systems are being increasingly documented in the Amazon basin and their characterization is crucial for reconstructing fluvial evolution in this area. Fluvial morphologies, including elongate belts, are well preserved along the Madeira River. Digital Elevation Model from the Shuttle Radar Topography Mission favored the detection of these features even where they are covered by dense rainforest. These paleomorphologies are attributed to the shifting position of past tributaries of the Madeira River through avulsions. These radial paleodrainage networks produced fan-shaped morphologies that resemble distributary megafans. Distinguishing avulsive tributary systems from distributary megafans in the sedimentary record is challenging. Madeira´s...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Paleochannels; Amazon Basin; Madeira river; Remote sensing; Climate; Tectonics.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100029
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