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Variability of carbon dioxide flux from tropical (Cerrado) hydroelectric reservoirs.
Hydroelectric reservoirs generate energy without significant combustion of fossil fuels. However, these systems can, potentially, emit greenhouse gases (GHGs) at a rate which may be significant at the global scale, and, possible, co-equal, per kilowatt-hour, to that from conventional coal or oil-fir...- por Portal Padrão
- publicado
- 26/08/2010
- 1:21 PM
Is the forest conversion to pasture affecting the hydrological response of Amazonian catchments? signals in the Ji-Paraná basin.
It is well known that land use and land-cover changes (LUCC), particularly deforestation, have the potential to modify the hydrological response. Although those signals are relatively well documented in worldwide microcatchment studies, conflicting results reported in literature indicate that those ...- por Portal Padrão
- publicado
- 26/08/2010
- 1:20 PM
The climate version of the Eta regional forecast model.
A new version of ETA WS (workstation) forecast model destined for long-term climate change simulation (ETA CCS) was designed. Numerous modifications and corrections have been made in the original code of the ETA WS forecast model. As a first step in the ETA CCS validation program, we have integrated...- por Portal Padrão
- publicado
- 26/08/2010
- 1:19 PM
Climate downscaling over South America for 1961-1970 using the Eta Model.
This study shows the results from a regional climate simulation of the present-day climate, corresponding to the period 1961-1970 over South America, using the regional Eta Model nested within the HadAM3P model from the UK Hadley Centre. The simulation analysis is focused on assessing the capability...- por Portal Padrão
- publicado
- 26/08/2010
- 1:18 PM
Cenários de mudança climática para a América do Sul para o final do século 21.
A melhor ferramenta para projetar cenários prováveis de alterações climáticas para o futuro são os modelos matemáticos do sistema climático global (MCG), que levam em conta de forma quantitativa (numérica) o comportamento dos compartimentos climáticos (atmosfera, oceanos, criosfera (áreas...- por Portal Padrão
- publicado
- 26/08/2010
- 1:16 PM
Addressing the complexity of the Earth system.
Earth system science addresses natural and human-driven processes affecting the evolution and ultimately the habitability of the planet. We must recognize that the Earth system encompasses interactions among the atmosphere, ocean, ice, land, biochemistry, and humanity. Humanity has advertent- ly and...- por Portal Padrão
- publicado
- 26/08/2010
- 1:15 PM
Climatology of extratropical cyclones over the South American – Southern oceans sector.
A climatology of extratropical cyclones is presented. Extratropical cyclones, their main characteristics and their predominant tracks, as well as their interannual variability affect weather in South America. For that purpose, a storm-track database has been compiled by applying a cyclone tracking s...- por Portal Padrão
- publicado
- 26/08/2010
- 1:14 PM
Temporal downscaling: a comparison between artificial neural network and autocorrelation techniques over the Amazon Basin in present and future climate change scenarios.
Several studies have been devoted to dynamic and statistical downscaling for both climate variability and climate change. This paper introduces an application of temporal neural networks for downscaling global climate model output and autocorrelation functions. This method is proposed for downscalin...- por Portal Padrão
- publicado
- 26/08/2010
- 1:12 PM
Contextualizing ethanol avoided carbon emissions in Brazil.
We propose to compare avoided emissions from ethanol use in Brazil with emissions caused by the use of fossil fuel, and by land use changes, specifically Amazon deforestation. The avoided emissions of CO2 in Brazil due to ethanol use in 2008 ranged from approximately 9 to 12 TgCyr1. These values are...- por Portal Padrão
- publicado
- 26/08/2010
- 1:10 PM
Nitrogênio dissolvido em rios de regiões distintas do Brasil.
A carga do nitrogênio em rios é cada vez mais controlada por atividades humanas independentemente da escala espacial, do clima, ou da região geográfica. Consequentemente, esforços de modelagem que predizem exportação de nitrogênio usam atributos que refletem atividades humanas, tais quais, d...- por Portal Padrão
- publicado
- 26/08/2010
- 1:09 PM
Atmospheric SO2 measurements at the Brazilian Antarctic Station.
For a better comprehension of the atmospheric chemical and radiative properties, it is necessary to understand the behaviour of trace gases and aerosols; some of these gas types have not been deeply studied. Sulphur dioxide (SO2) is found in the troposphere, as a result of both natural and anthropog...- por Portal Padrão
- publicado
- 26/08/2010
- 1:06 PM
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