Solar radiation forecast using artificial neural networks.
The fast increase in importance of the solar energy resource as viable and promising source of renewable energy has boosted research in methods to evaluate the short-term forecasts of the solar energy resource. There is an increase on demand from the energy sector for accurate short-term forecasts o...
por Portal Padrão
publicado
26/12/2012
1:22 PM
Socio-climatic hotspots in Brazil.
Brazil suffers yearly from extreme weather and climate events, which can be exacerbated in a warmer climate. Although several studies have analyzed the projections of climate change in Brazil, little attention has been paid to defining the locations that can be most affected, and consequently have a...
por Portal Padrão
publicado
26/11/2012
1:36 PM
Estimating greenhouse gas emissions from cattle raising in Brazil.
The study estimated, for the first time, the greenhouse gas emissions associated with cattle raising in Brazil, focusing on the period from 2003 to 2008 and the three principal sources: 1) portion of deforestation resulting in pasture establishment and subsequent burning of felled vegetation; 2) pas...
por Portal Padrão
publicado
23/11/2012
2:19 PM
Time-intervals between negative lightning strokes and the creation of new ground terminations.
On average, negative cloud-to-ground (CG) lightning flashes produce 3 to 5 return strokes, and a new ground termination is produced when any stroke after the first strikes the ground in a different place. In order to understand better the physical factors that affect the formation of new ground term...
por Portal Padrão
publicado
26/10/2012
12:59 PM
Sazonalidade da precipitação sobre o Nordeste setentrional brasileiro nas simulações do IPCC-AR4.
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por Portal Padrão
publicado
26/09/2012
1:34 PM
Coupled ocean-atmosphere variations over the south atlantic ocean.
The role of ocean-atmosphere interactions on summer rainfall over the South Atlantic Ocean is explored through the use of coupled ocean-atmosphere models. The Brazilian Center for Weather Forecast and Climate Studies (CPTEC) coupled ocean-atmosphere general circulation model (CGCM) and its atmospher...
por Portal Padrão
publicado
26/09/2012
1:23 PM
Scenarios for solar thermal energy applications in Brazil.
The Solar and Wind Energy Resource Assessment (SWERA) database is used to prepare and discuss scenarios for solar thermal applications in Brazil. The paper discusses low temperature applications (small and large scale water heating) and solar power plants for electricity production (concentrated sol...
por Portal Padrão
publicado
26/09/2012
1:19 PM
Distributed hydrological modeling of a micro-Scale rainforest watershed in Amazonia: model evaluation and advances in calibration using the new HAND terrain model.
Three sections of the Asu catchment, which is located within the Cuieiras Reservation 80 km northwest of Manaus in Central Amazonia, Brazil, were gauged to create nested catchments of the first (0.95 km2), second (6.58 km2) and third (12.43 km2) Strahler orders. As the Cuieiras reserve contains pris...
por Portal Padrão
publicado
23/09/2012
2:59 PM
Climate fields over South America and variability of SACZ and PSA in HadGEM2-ES CMIP5.
Historical simulations (present climate) and projections under RCP8.5 scenario (future climate) by HadGEM2-ES of temperature and precipitation are analyzed during the four seasons in South America. Projections of precipitation are discussed in terms of atmospheric circulation. The South Atlantic Con...
por Portal Padrão
publicado
23/09/2012
2:25 PM
Methods to overcome lightning location system performance limitations on spatial and temporal analysis: brazilian case.
One of the most interesting attributes of Lightning Location Systems (LLSs) data is that they can be analyzed in several ways according to the objectives of the study. However, the quality of the data is governed by the system performance and has some limitations when analyzed at different temporal/...
por Portal Padrão
publicado
23/09/2012
2:18 PM
Resolution of the sprite polarity paradox: the role of halos.
This study revisits the sprite polarity paradox, first manifest by observations that exceptional cloud-to-ground flashes with negative polarity generally did not produce detectable sprites. The paradox is here resolved by the Transient Luminous Event (TLE) known as the halo, which on account of its ...
por Portal Padrão
publicado
26/08/2012
1:38 PM
Evapotranspiration of deforested areas in central and southwestern Amazonia.
Considering the high rates of evapotranspiration of Amazonian forests, understanding the impacts of deforestation on water loss rates is important for assessing those impacts on a regional and global scale. This paper quantifies evapotranspiration rates in two different pasture sites in Amazonia and...
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