High-speed video observations of natural cloud-to-ground lightning leaders: a statistical analysis.
The aim of this investigation is to analyze the phenomenology of positive and negative (stepped and dart) leaders observed in natural lightning from digital high-speed video recordings. For that intent we have used four different high-speed cameras operating at frame rates ranging from 1000 or 11,80...
por Portal Padrão
publicado
20/01/2014
4:39 PM
Pervasive transition of the Brazilian land-use system
Agriculture, deforestation, greenhouse gas emissions and local/regional climate change have been closely intertwined in Brazil. Recent studies show that this relationship has been changing since the mid 2000s, with the burgeoning intensification and commoditization of Brazilian agriculture. On one h...
por Portal Padrão
publicado
20/01/2014
3:35 PM
Simulation of rainfall anomalies leading to the 2005 drought in Amazonia using the CLARIS LPB regional climate models
The meteorological characteristics of the drought of 2005 in Amazonia, one of the most severe in the last 100 years were assessed using a suite of seven regional models obtained from the CLARIS LPB project. The models were forced with the ERA-Interim reanalyses as boundary conditions. We used a comb...
por Portal Padrão
publicado
22/12/2013
2:18 PM
Two contrasting severe seasonal extremes in Tropical South America in 2012: flood in Amazonia and drought in Northeast Brazil
Two simultaneous extreme events affected tropical South America to the east of the Andes during the austral summer and fall of 2012: a severe drought in Northeast Brazil and intense rainfall and floods in Amazonia, both considered records for the last 50 years. Changes in atmospheric circulation and...
por Portal Padrão
publicado
22/11/2013
2:15 PM
Oil palm biodiesel: Brazil’s main challenges
The National Program for Production and Use of Biodiesel (PNPB), launched in Brazil, is based on the diversification of its feedstock and social inclusion. Among the various oilseeds, palm was identified as the ideal one for the Northern region. However, the participation of palm is still not repres...
por Portal Padrão
publicado
22/10/2013
1:39 PM
Climate simulation and change in the Brazilian Climate Model
The response of the global climate system to atmospheric CO2 concentration increase in time is scrutinized employing the Brazilian Climate Model (BESM-OA2.3). Through the achievement of over two thousand years of coupled model integrations in ensemble mode, it is shown that the model simulates the s...
por Portal Padrão
publicado
22/09/2013
2:30 PM
Extreme rainfall, vulnerability and risk: a continental-scale assessment for South America
Extreme weather continues to preoccupy society as a formidable public safety concern bearing huge economic costs. While attention has focused on global climate change and how it could intensify key elements of the water cycle such as precipitation and river discharge, it is the conjunction of geophy...
por Portal Padrão
publicado
22/08/2013
4:33 PM
Inter-annual variability of carbon and water fluxes in Amazonian forest, Cerrado and pasture sites, as simulated by terrestrial biosphere models
This study analyzes the inter-annual variability (IAV) of simulations of 21 different land surface model formulations, driven by meteorological conditions measured at 8 flux towers, located in rain forest, forest-savanna ecotone and pasture sites in Amazonia, and one in savanna site in Southeastern ...
por Portal Padrão
publicado
22/08/2013
4:32 PM
One-dimensional simulation of fire injection heights in contrasted meteorological scenarios with PRM and Meso-NH models
Wild-fires release huge amounts of aerosol and hazardous trace gases in the atmosphere. The residence time and the dispersion of fire pollutants in the atmosphere can range from hours to days and from local to continental scales. These various scenario shighly depend on the injection height of smo...
por Portal Padrão
publicado
22/08/2013
4:27 PM
Comparision of ground techniques used to estimate cloud cover in Florianópolis, southern Brazil
Cloud cover is a key feature in Earth images acquired from space. Cloud cover data play a significant role in the weather forecast and climate knowledge, as well as in several human activities. Several studies have been conducted to establish a methodology and experimental setup in order to acquire ...
por Portal Padrão
publicado
22/08/2013
4:25 PM
Características gerais da composição química de mananciais da planície do Araguaia
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por Portal Padrão
publicado
22/08/2013
4:24 PM
Formação de educadores ambientais na gestão de comitê de bacia hidrográfica
O primeiro passo para o gerenciamento participativo das Bacias hidrográficas é identificar os diferentesprotagonistas sociais que atuam na gestão dos recursos hídricos. Para que em seguida, os atores sociais, atravésdo processo de educação ambiental, na capacitação de gestores públicos, t...
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