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...
por Portal Padrão
publicado
26/08/2012
1:37 PM
Planetary stewardship in an urbanizing world: beyond city limits.
...
por Portal Padrão
publicado
26/08/2012
1:31 PM
Anodic and cathodic pre-treatment effects on BDD surface to deposit copper nanoparticles applied to nitrate reduction.
The influence of anodic and cathodic pre-treatment on boron doped diamond (BDD) surface for copper (Cu) electrodeposition was studied to assess Cu particle consolidation on BDD electrode. These modified electrodes were applied to study the nitrate electrochemical reduction process. The obtained resu...
por Portal Padrão
publicado
26/08/2012
1:30 PM
Modeling South America regional smoke plume: aerosol optical depth variability and shortwave surface forcing.
Intra-seasonal variability of smoke aerosol optical depth (AOD) and downwelling solar irradiance at the surface during the 2002 biomass burning season in South America was modeled using the Coupled Chemistry-Aerosol-Tracer Transport model to the Brazilian developments on the Regional Atmospheric Mod...
por Portal Padrão
publicado
26/08/2012
1:29 PM
Climate change in Brazil: perspective on the biogeochemistry of inland waters.
Although only a small amount of the Earths water exists as continental surface water bodies, this compartment plays an important role in the biogeochemical cycles connecting the land to the atmosphere. The territory of Brazil encompasses a dense river net and enormous number of shallow lakes. Human ...
por Portal Padrão
publicado
26/08/2012
1:27 PM
Overcoming barriers to collective action in community-based fisheries management in the Amazon.
A set of freshwater fisheries management institutions in the central Brazilian Amazon leads us to propose an expansion of the common pool resource (CPR) management models developed by Ostrom. We analyze the origins and effectiveness of a community-based CPR system that has emerged despite several fe...
por Portal Padrão
publicado
26/08/2012
1:25 PM
Tropical South America East of the Andes.
...
por Portal Padrão
publicado
26/08/2012
1:25 PM
Nitrogen mass balance in the Brazilian Amazon: an update.
The main purpose of this study is to perform a nitrogen budget survey for the entire Brazilian Amazon region. The main inputs of nitrogen to the region are biological nitrogen fixation occurring in tropical forests (7.7 Tg.yr -1), and biological nitrogen fixation in agricultural lands mainly due to ...
por Portal Padrão
publicado
26/08/2012
1:16 PM
Extreme climatic events in the Amazon basin: climatological and hydrological context of recent floods.
During 2009 the Amazon basin was hit by a heavy flooding with a magnitude and duration few times observed in several decades. Torrential rain in northern and eastern Amazonia during the austral summer of 20082009 swelled the Amazon River and its tributaries. By July 2009, water levels of the Rio Neg...
por Portal Padrão
publicado
26/08/2012
1:15 PM
Development of regional future climate change scenarios in South America using the Eta CPTEC/HadCM3 climate change projections: climatology and regional analyses for the Amazon, São Francisco and the Parana River basins.
The objective of this study is to assess the climate projections over South America using the Eta-CPTEC regional model driven by four members of an ensemble of the Met Office Hadley Centre Global Coupled climate model HadCM3. The global model ensemble was run over the twenty-first century according ...
por Portal Padrão
publicado
26/08/2012
1:11 PM
The 2011 intense rainfall and floods in Rio de Janeiro.
Redes Sociais