The geochemical characteristics of the Paraná River suspended sediment load: an initial assessment

Depetris, Pedro J.; Probst, Jean‐Luc; Pasquini, Andrea I.; Gaiero, Diego M.

doi:10.1002/hyp.1283

Cited by 63 publications

(49 citation statements)

References 20 publications

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“…Hydrological regularities are shown through long-term studies, which enables tendencies in hydrological variability to be determined (Neiff, 1996). Depetris et al (2003) always coincide with long-term hydrological records and that these phases are usually related to the global climatic phenomenon called ''El Niño Southern Oscillation'' (ENSO). The ENSO drives complex weather patterns such as wind direction and velocity, temperature, and the timing and amount of precipitation over cycles that return roughly every 3-7 years (Schonher and Nicholson, 1989).…”

Section: Discussionmentioning

confidence: 91%

Eight years of monitoring aquatic Oligochaeta from the Baía and Ivinhema Rivers

et al. 2009

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The aim of this study was to analyze the factors that influence spatial and temporal variations of the Oligochaeta assemblage in the Baía and Ivinhema Rivers, located in the Upper Paraná River floodplain (Mato Grosso do Sul State, Brazil). Samples of Oligochaeta were collected between February 2000 and November 2007. A total of 27 Oligochaeta species were identified. A Principal Component Analysis (PCA) of the physical and chemical variables was used to summarize the total variation in the data and to identify major environmental gradients. Detrended Correspondence Analysis (DCA) was conducted to verify possible spatial and temporal gradients in the Oligochaeta species distribution. The highest Oligochaeta species densities and richness values were recorded during limnophases. The intensity and amplitude of the potamophase influenced the density, richness and composition of Oligochaeta since many species were transported by high water current velocities and/or died due to the low oxygen levels that are characteristic of this phase. L. hoffmeisteri, P. descolei and A. pigueti were recorded in the potamophase and in the limnophase and we concluded that they are adapted to different conditions of rivers (lotic and lentic) due to the presence of these species during the entire study period in both rivers. Nevertheless, these species were dominant in the potamophase periods of these rivers as they have body adaptations to survive in these conditions. Keywords: Oligochaeta species, Baía and Ivinhema Rivers, flood pulse intensity and amplitude. Oito anos de monitoramento de Oligochaeta aquáticas nos Rios Baía e IvinhemaResumo O objetivo do estudo foi analisar os fatores que influenciam as variações espaciais e temporais da assembléia de Oligochaeta nos Rios Baía e Ivinhema, localizados na planície de inundação do Alto Rio Paraná. (Estado do Mato Grosso do Sul, Brasil). As amostras de Oligochaeta foram coletadas de fevereiro de 2000 a novembro de 2007. Um total de 27 espécies foi identificado. Análise de Componentes Principais (PCA) das variáveis físicas e químicas foi usada para sumarizar a variação total nos dados e identificar os principais gradientes ambientais. Para verificar possíveis gradientes espaciais e temporais na distribuição das espécies de Oligochaeta foi realizada uma Análise de Correspondência Dendrítica com remoção do efeito de arco (DCA). As maiores densidades e riqueza de espécies de Oligochaeta foram registradas nos períodos de águas baixas. A intensidade e amplitude da potamofase influenciaram a riqueza, densidade e composição de espécies, uma vez que muitas das espécies foram carreadas pela alta velocidade de corrente de água e/ou mortas devido aos baixos níveis de oxigênio que foram característicos dessa fase. L. hoffmeisteri, P. descolei and A. pigueti foram registradas nos períodos de potamofase e limnofase e nós concluímos que são adaptadas a diferentes condições de rios (lótico e lêntico) devido a preseça dessas espécies durante todo período estudado em ambos os rios. Contudo, essas e...

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Section: Discussionmentioning

confidence: 91%

Eight years of monitoring aquatic Oligochaeta from the Baía and Ivinhema Rivers

et al. 2009

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“…Histograms of long-term mean average monthly precipitation display a strong Southern Hemisphere winter minimum (Fig. 2), particularly in the northwestern sector of the LPRDB, which supplies most of the particulate load of the La Plata River (Depetris and Kempe, 1993;Depetris et al, 2003).…”

Section: Southeastern South Americamentioning

confidence: 99%

“…During Termination 1, our core site received terrigenous material discharged from the La Plata River drainage basin (LPRDB) as attested by Nd isotopes (Lantzsch et al, 2014). Within the LPRDB, most of the suspended load (Depetris et al, 2003) and particulate organic matter (Depetris and Kempe, 1993) originates from the Bermejo River sub-basin, located in the northwest domain. The amount of river suspended load corresponds to the discharge (Depetris et al, 2003), and most of the particulate organic matter is soil-derived (Depetris and Kempe, 1993).…”

Section: Lipid Analyses and Continental Mean Air Temperaturesmentioning

confidence: 99%

“…Within the LPRDB, most of the suspended load (Depetris et al, 2003) and particulate organic matter (Depetris and Kempe, 1993) originates from the Bermejo River sub-basin, located in the northwest domain. The amount of river suspended load corresponds to the discharge (Depetris et al, 2003), and most of the particulate organic matter is soil-derived (Depetris and Kempe, 1993). Thus, we expect our MAT record to represent a LPRDBintegrated signal with a predominant contribution from its northwestern domain.…”

Section: Lipid Analyses and Continental Mean Air Temperaturesmentioning

confidence: 99%

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Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1

Chiessi¹,

Mulitza

Mollenhauer

et al. 2015

Clim. Past

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Abstract. During Termination 1, millennial-scale weakening events of the Atlantic meridional overturning circulation (AMOC) supposedly produced major changes in sea surface temperatures (SSTs) of the western South Atlantic, and in mean air temperatures (MATs) over southeastern South America. It has been suggested, for instance, that the Brazil Current (BC) would strengthen (weaken) and the North Brazil Current (NBC) would weaken (strengthen) during slowdown (speed-up) events of the AMOC. This antiphase pattern was claimed to be a necessary response to the decreased North Atlantic heat piracy during periods of weak AMOC. However, the thermal evolution of the western South Atlantic and the adjacent continent is so far largely unknown. Here we address this issue, presenting high-temporal-resolution SST and MAT records from the BC and southeastern South America, respectively. We identify a warming in the western South Atlantic during Heinrich Stadial 1 (HS1), which is followed first by a drop and then by increasing temperatures during the Bølling-Allerød, in phase with an existing SST record from the NBC. Additionally, a similar SST evolution is shown by a southernmost eastern South Atlantic record, suggesting a South Atlantic-wide pattern in SST evolution during most of Termination 1. Over southeastern South America, our MAT record shows a twostep increase during Termination 1, synchronous with atmospheric CO 2 rise (i.e., during the second half of HS1 and during the Younger Dryas), and lagging abrupt SST changes by several thousand years. This delay corroborates the notion that the long duration of HS1 was fundamental in driving the Earth out of the last glacial.

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“…Por isso, em ambientes tropicais o intemperismo é intenso e os minerais primários das rochas são rapidamente convertidos em fases secundárias mais estáveis (Ollier, 1969). Diversos autores propõem a hidrogeoquímica fluvial como representativa da geologia drenada e indicativo de processos e taxas de intemperismo, principalmente no caso de pequenas a médias bacias (ordem 1 a 3 de Strahler) (Garrels & Mackenzie, 1967;Bittencourt, 1980;Ovalle, 1985;Lesack, 1993;Ramirez & Andara, 1993;Stallard, 1995;Viers et al, 1997;Silveira & Coelho Netto, 1999;Souza et al, 2001;Depetris et al, 2003;Chakaprani, 2005;von Strandmann et al 2010;Hagedorn et al, 2011).…”

Section: Introductionunclassified

Metal Hydrogeochemistry in Stream Water: Granitic and Gnaissic Sources - Paquequer Watershed, Teresópolis, Rio de Janeiro State

et al. 2014

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ResumoA bacia de drenagem do rio Paquequer (269 km²) faz parte da região hidrográfica do rio Paraíba do Sul e situa-se no município de Teresópolis no estado do Rio de Janeiro. A sua litologia é representativa dos granitos e gnaisses da Região Sudeste do Brasil. Objetiva-se avaliar o processo de intemperismo destas rochas e a mobilidade dos elementos químicos através da hidrogeoquímica fluvial. Foram amostrados 15 pontos fluviais (com medição de vazão e parâmetros físico-químicos) sendo 9 no canal principal e 6 nos principais afluentes. As amostras foram analisadas por ICP-MS para Si, Fe, Mn, Al, Cu, Ni, Cr, Zn, Ba, Rb, Sr, Pb, Cd e Co e por cromatografia de íons para Na. Dados da literatura referentes à composição elementar destas rochas foram utilizados. A hidrogeoquímica fluvial é dominada por Na, Ca e Si. Os metais Pb, Cd, Co e Cr apresentaram valores muito baixos refletindo a baixa abundância nas rochas e a inexistência de fontes antrópicas industriais. As concentrações encontradas para os elementos Ni, Zn e Cu foram baixas e relacionadas ao núcleo urbano. A análise estatística multivariada mostrou 4 grupos principais, sendo utilizado o grupo 2 (pontos do médio e baixo curso do canal principal) para a estimativa de intemperismo. A composição geoquímica da Unidade Rio Negro (migmatito) influenciou a hidrogeoquímica através da razão Mg/Fe, maior no afluente que drena esta litologia. A carga fluvial indicou a fonte principal litológica para Si, Mg, Na, K, Ca, Sr, Ba e Rb. A estimativa de taxa de intemperismo indicou 3 grupos de elementos: i) os muito móveis (Ca e Sr); ii) os pouco móveis (Mg, K, Mn, Rb, Ba e Si) e iii) os imóveis (Fe e Al). Desta forma sugere-se que o plagioclásio (com Ca e Sr na sua estrutura) é o primeiro mineral a ser dissolvido e lixiviado na água percolante no perfil de intemperismo, seguido pelo K-feldspato e biotita. Parte do Si é retida para a cristalização de minerais secundários como os argilominerais. Os elementos Fe e Al têm tendência a formação de óxidos e hidróxidos que permanecem no perfil de intemperismo, justificando a baixa mobilidade. Palavras-chave: hidrogeoquímica; intemperismo; geoquímica; elementos químicos AbstractThe Paquequer watershed (269 km ²) belongs to Paraíba do Sul river drainage basin and is located in the municipal area of Teresopolis, Rio de Janeiro state. Its geology is typical of southeastern Brazil granites and gneisses. The aim of this work was to evaluate the weathering process of these rocks and the mobilities of the chemical elements through a hydrogeochemical approach. 15 river points were sampled. River discharge and physico-chemical parameters were measured. Nine points were located in the main channel and six in the major tributaries. The samples were analyzed by ICP-MS for Si, Fe, Mn, Al, Cu, Ni, Cr, Zn, Ba, Rb, Sr, Pb, Cd and Co and by ion chromatography for Na . Literature data concerning the geochemistry of these rocks was used. The fluvial hydrogeochemistry is dominated by Na, Ca and Si. In contrast, Pb, Cd, Co and Cr showed very low values re...

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The geochemical characteristics of the Paraná River suspended sediment load: an initial assessment

Cited by 63 publications

References 20 publications

Eight years of monitoring aquatic Oligochaeta from the Baía and Ivinhema Rivers

Eight years of monitoring aquatic Oligochaeta from the Baía and Ivinhema Rivers

Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1

Metal Hydrogeochemistry in Stream Water: Granitic and Gnaissic Sources - Paquequer Watershed, Teresópolis, Rio de Janeiro State

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