Estudo de íons maiores no extrato aquoso de particulado atmosférico em São José dos Campos.
Para compreender os processos de emissão, transformação e contaminação da atmosfera urbana por poluentes é muito importante observar diferentes parâmetros de qualidade para identificar e quantificar espécies químicas, principalmente em áreas com forte influência antropogênicas, pois a at...
por Portal Padrão
publicado
21/08/2014
1:22 PM
Location accuracy evaluation of lightning location systems using natural lightning flashes recorded by a network of high-speed cameras.
This work presents a preliminary method for the evaluation of location accuracy of all Lightning Location System (LLS) in operation in southeastern Brazil (e.g. BrasilDAT, RINDAT, StarNet, WWLLN, GLD360), using natural cloud-to-ground (CG) lightning flashes. This can be done through a multiple high-...
por Portal Padrão
publicado
21/08/2014
1:14 PM
A global assessment of precipitation chemistry and deposition of sulfur, nitrogen, sea salt, base cations, organic acids, acidity and pH, and phosphorus.
A global assessment of precipitation chemistry and deposition has been carried out under the direction of the World Meteorological Organization (WMO) Global Atmosphere Watch (GAW) Scientific Advisory Group for Precipitation Chemistry (SAG-PC). The assessment addressed three questions: (1) what do me...
por Portal Padrão
publicado
21/08/2014
1:07 PM
Observational evidence of the urban heat island of Manaus City, Brazil.
This work examined observationally the Urban Heat Island (UHI) of Manaus city, Brazil. For this, data collected from two different sites, in an urban area and from a region of forest about 30 km from city, for the period of 20002008, were used. The results show that the urban environment creates a l...
por Portal Padrão
publicado
21/08/2014
1:06 PM
Spectral/textural attributes from ALI/EO-1 for mapping primary and secondary tropical forests and studying the relationships with biophysical parameters
We analysed spectral and textural attributes from the Advanced Land Imager (ALI)/EO-1 for land-cover mapping and inspected their correlation with biophysical parameters of primary and secondary forests from Eastern Amazon. An artificial neural network (ANN) technique selected the most relevant spect...
por Portal Padrão
publicado
21/08/2014
1:03 PM
Modeling the impact of net primary production dynamics on post-disturbance Amazon savannization
Amazon tropical forests are being replaced by pasturelands and croplands, but they sometimes revert to regrowth forest when abandoned after a period of agricultural use. Research suggests that this secondary regrowth is limited by climate and nutrient availability and, using a coupled biosphere-atmo...
por Portal Padrão
publicado
21/08/2014
1:01 PM
High-speed video and electromagnetic analysis of two natural bipolar cloud-to-ground lightning flashes
High-speed video records of two bipolar cloud-to-ground flashes were analyzed in detail. They both began with a single positive return stroke that was followed by more than one subsequent weak negative stroke. Due to the elevated cloud base height of its parent thunderstorm, the preparatory processe...
por Portal Padrão
publicado
21/08/2014
12:59 PM
Electric systems failures produced by CG lightning in eastern Amazonia.
Operational records of power outages of the electric energy distribution systems in eastern Amazonia presented a large number of events attributed to lightning strikes, during the 2006 to 2009 period. The regional electricity concessionary data were compared to actual lightning observations made by ...
por Portal Padrão
publicado
20/08/2014
4:26 PM
Classificação de eventos extremos de precipitação em múltiplas escalas de tempo em Belém-PA: utilizando o índice de precipitação normalizada.
O Índice de Precipitação Normalizada (SPI) é utilizado para quantificar o déficit e/ou excesso de precipitação nas múltiplas escalas de tempo. Ele tem se mostrado bastante útil no monitoramento da precipitação, principalmente pela sua flexibilidade, simplicidade de cálculo e interpretaç...
por Portal Padrão
publicado
20/08/2014
4:21 PM
Variabilidade da precipitação no Estado do Pará por meio de análise em componentes principais
O método da Análise Fatorial em Componentes Principais e dos Agrupamentos Hierárquicos foram utilizados para determinar os padrões principais de variabilidade temporal e espacial, assim como identificação dos grupos homogêneos, da precipitação no Estado do Pará. Para isso utilizaram-se dad...
por Portal Padrão
publicado
20/08/2014
4:19 PM
Knowledge extraction from large climatological data sets using a genome-wide analysis approach: application to the 2005 and 2010 Amazon droughts.
Today, the volume of data generated in almost all disciplines, particularly in meteorology and climate science, is dramatically increasing. Among the challenges generated by this data deluge is the development of efficient knowledge discovery strategies. Here, we show that statistical and computatio...
por Portal Padrão
publicado
20/08/2014
4:16 PM
Impacts of landscape fragmentation on simulated precipitation fields in the Amazonian sub-basin of Ji-Paraná using the Eta model.
Numerical studies on impacts of landscape fragmentation due to land use and land cover change (LUCC) on precipitation fields over the Ji-Paraná basin in the Amazon region are carried out using atmospheric Eta model. Experiments consider historical data about LUCC over the basin from 1978 to 2000 an...
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