Effects of a La Niña event on hydrological patterns and copepod community structure in a shallow tropical estuary (Taperaçu, Northern Brazil)

Andrade, Marcela Pimentel de; Magalhães, André; Pereira, Luci Cajueiro Carneiro; Flores‐Montes, Manuel; Pardal, Emarielle Coelho; Andrade, Thamara P.; Costa, Rauquı́rio Marinho da

doi:10.1016/j.jmarsys.2016.07.006

Cited by 24 publications

(26 citation statements)

References 85 publications

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“…In fact, the water was less saline, more alkaline, more oxygenated, and nutrient and chlorophyll-a concentrations were much higher (over 50%) in June in comparison with the same month of the previous year, reflecting the much higher rainfall (more than 30%) during the period between March and June, in comparison with the same period in 2012. Overall, then, during the rainy season under typical conditions, these waters are less saline (over 40%, figure 3A) than those recorded during this drought period and much less saline (over 60%, i.e., around 10) under a La Niña event (Andrade et al 2016), showing that this small estuary was adversely affected by the drought event.…”

Section: Discussionmentioning

confidence: 74%

“…In recent years, the Amazon coastal zone has been increasingly impacted by atypical climatic conditions (Pereira et al 2013;Andrade et al 2016), although what happens during years of drought events is not wellunderstood. While an increase in rainfall levels and fluvial discharge affect the waters of whole Amazon coast, no information is available on how drought events may affect the oceanographic processes in these ecosystems.…”

Section: Introductionmentioning

confidence: 99%

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Influence of a Drought Event on Hydrological Characteristics of a Small Estuary on the Amazon Mangrove Coast

Pereira

Costa

et al. 2017

Estuaries and Coasts

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The effects of atypical climatic conditions, such as those of a drought event, are remarkably accentuated in minor estuaries filled with sediments and with reduced or sporadic freshwater input, where the salinity intrusion is pronounced. To understand these effects, hydrological and hydrodynamic parameters were evaluated during a drought period in a small estuary located on the eastern Amazon coast in northern Brazil. Five campaigns were conducted between June 2012 and June 2013. Samples were collected from the surface and bottom layer every three hours over a 25-hour period at three stations of the Taperaçu Estuary. To compare drought and post-drought periods, in terms of salinity and chlorophyll-a, data was recorded until June 2015. Taperaçu is a relatively shallow estuary of the Amazon coastal zone, which is characterized by the absence of any direct fluvial discharge, although it does receive freshwater input from adjacent wetlands, as well as less saline waters from the Caeté Estuary through the Taici Creek. Hydrological variables were controlled by rainfall levels and the tidal range, and the water became more saline and more oxygenated, with reduced dissolved nutrient and chlorophyll-a concentrations when precipitation decreased. Significant variation was found between the months of June 2012 (most intense drought) and 2013 (less intense drought). The connection to the neighboring Caeté Estuary, and adjacent mangroves and wetlands contributed to the influx of nutrient-enriched waters. Overall, then, it is hoped that the results of this study can contribute to the understanding of the effects of drought events in other minor estuaries on the highly indented Amazon coast, as well as in other areas of the equatorial zone with similar environmental characteristics.

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Section: Discussionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Influence of a Drought Event on Hydrological Characteristics of a Small Estuary on the Amazon Mangrove Coast

Pereira

Costa

et al. 2017

Estuaries and Coasts

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“…The level of correlation between the satellite and terrestrial data was determined to test the efficiency of the former for the interpolation of the latter data to areas with no terrestrial coverage. Data from the National Oceanic and Atmospheric Administration (NOAA) and scientific papers (ANDRADE et al, 2016; were used to evaluate the influence of extreme climatic events, such as El Niño, La Niña, and droughts.…”

Section: Datamentioning

confidence: 99%

Spatiotemporal Variation in the Precipitation of the Amazon Coastal Zone: Use of Remote Sensing and Multivariate Analysis

Santos

Vitorino

Pereira

2019

ABClima

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Reliable data on the spatiotemporal variability in precipitation patterns are vital to the development of effective public policies for environmental management. The analysis of the variation in rainfall rates is currently limited severely by the dependence on data from rain gauges, in particular in regions with a relatively sparsely-distributed network of meteorological stations, as in the Amazon region. The present study investigated the variability in the precipitation and the principal rainfall patterns at different time scales in the coastal zone of the Amazon region, and associated these patterns with the precipitant meteorological systems present in the region. The study was based on the application of remote sensing (Climate Prediction Center morphing method-CMORPH) data taken at half-hourly intervals on a 0.07 degrees latitude/longitude scale. The spatiotemporal variability in the region's precipitation was analyzed at different time scales (monthly, seasonal, and annual), with distribution patterns being assessed using a Principal Components Analysis (PCA). The estimates obtained from the CMORPH data provided a satisfactory overview of the precipitation climatology of the study region at the distinct time scales, compared to surface data. The PCA identified a precipitation gradient in the two principal pluviometric modes, which together explained 88% of the total variance in the data. The first mode explained 83% of the variance, with two distinct periods, a rainy season and a dry (or less rainy) period, which are influenced by large-scale precipitant systems, the Intertropical Convergence Zone (ITCZ) and High Level Cyclonic Vortices (HLCVs). The second mode, which explains 5% of the variance in the rainfall data, is associated with mesoscale systems that affect primarily the transition periods between the seasons, and depend on the southern extreme of the annual shift in the ITCZ. The understanding of the variation of precipitation patterns using highresolution CMORPH data, with a comprehensive coverage in both time and space, provides an effective tool for the establishment of public policies at a municipal level, in particular the development of models, and the mediation of the vulnerability of local populations to climatic extremes.

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“…A título de exemplo, o El Niño (La Niña) é responsável pelo aumento (diminuição) de extremos de vazão na região das bacias do Paraguai e Uruguai (Brasil central) (Tedeschi e Grimm, 2008). A La Niña também exerce influência significativa nos padrões hidrológicos de bacias do norte do Brasil (Boening et al, 2012;Andrade et al, 2016).…”

Section: Introductionunclassified

Padrões de Variabilidade em Vazões Afluentes a Usinas Hidrelétricas e Associações com Massas de Ar

Meira

Oliveira

2018

CADEST

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Os padrões fluviais brasileiros são sensíveis a diversos fatores geográficos e atmosféricos locais e de grande escala, sofrendo variações consideráveis ao longo da extensão territorial do País. Apesar da vasta gama de informações hoje disponíveis sobre esses fatores, sabe-se que a vazão de rios brasileiros possui relações significativas com padrões climáticos bem característicos, podendo se substituir, por vezes, uma quantidade expressiva de elementos por amostras que concentrem a maior parte das informações estatísticas da base de dados. Nesse contexto, este trabalho buscou identificar, por meio da aplicação de diferentes técnicas de análise estatística multivariada, características comuns a diferentes rios brasileiros, utilizando como informação principal suas vazões. Os resultados sugerem que os comportamentos de grande parte dos rios brasileiros usados para aproveitamento hidrelétrico podem ser caracterizados por um conjunto pequeno de padrões bem definidos, que traduzem os diferentes regimes de massas de ar aos quais o território brasileiro está submetido.

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Effects of a La Niña event on hydrological patterns and copepod community structure in a shallow tropical estuary (Taperaçu, Northern Brazil)

Cited by 24 publications

References 85 publications

Influence of a Drought Event on Hydrological Characteristics of a Small Estuary on the Amazon Mangrove Coast

Influence of a Drought Event on Hydrological Characteristics of a Small Estuary on the Amazon Mangrove Coast

Spatiotemporal Variation in the Precipitation of the Amazon Coastal Zone: Use of Remote Sensing and Multivariate Analysis

Padrões de Variabilidade em Vazões Afluentes a Usinas Hidrelétricas e Associações com Massas de Ar

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