Downscaling of South America present climate driven by 4-member HadCM3 runs.
The objective of this work is to evaluate climate simulations over South America using the regional Eta Model driven by four members of an ensemble of the UK Met Office Hadley Centre HadCM3 global model. The Eta Model has been modified with the purpose of performing long-term decadal integrations an...
por Portal Padrão
publicado
23/02/2012
2:27 PM
Conversion of the coastal Atlantic forest to pasture: consequences for the nitrogen cycle and soil greenhouse gas emissions.
We evaluated how land use change affected the nitrogen cycle and greenhouse gas fluxes. We measured soil temperature and water-filled pore space (WFPS), as well as nitrate and ammonium concentrations, mineralization and nitrification rates, and flux of CH4, CO2 and N2O in soils of pasture catchment ...
por Portal Padrão
publicado
23/02/2012
2:23 PM
Recent developments on the South American monsoon system.
This paper reviews recent progress made in our understanding of the functioning and variability of the South American Monsoon System (SAMS) on time scales varying from synoptic to long-term variability and climate change. The SAMS contains one of the most prominent summertime climate patterns in Sou...
por Portal Padrão
publicado
26/01/2012
1:14 PM
Aerial rivers and lakes: looking at large-scale moisture transport, its relation to Amazonia and to subtropical rainfall in South America.
This is an observational study of the large-scale moisture transport over South America, with some analyses on its relation to subtropical rainfall. The concept of aerial rivers is proposed as a framework: it is an analogy between the main pathways of moisture flow in the atmosphere and surface rive...
por Portal Padrão
publicado
23/01/2012
2:14 PM
Raios urbanos
A máxima de que um raio não cai duas vezes no mesmo lugar não vale para o Brasil. O país tem a maior incidência de raios no mundo: cerca de 50 milhões de descargas elétricas atmosféricas atingem o solo nacional por ano, causando estragos em cons truções, transtornos para o setor elé t...
por Portal Padrão
publicado
22/10/2011
2:04 PM
Assessing the potential of concentrating solar photovoltaic generation in Brazil with satellite-derived direct normal irradiation
With the declining costs of flat plate and concentrating photovoltaic (PV) systems, solar PV generation in many sunny regions in Brazil will eventually become cost competitive with conventional and centralized power generation. Detailed knowledge of the local solar radiation resource becomes critica...
por Portal Padrão
publicado
22/08/2011
2:21 PM
Vegetation index performance for the Pantanal region during both dry and rainy seasons
This study aims to evaluate the performance of NDVI, EVI and LSWI in the Pantanal, considering the main types of land cover and seasonal rainfall. For this purpose, we used data from MODIS and TRMM monthly rainfall estimates. For the dry season, results varied between NDVI (0.4 and 0.8); LSWI (0.0 a...
por Portal Padrão
publicado
22/08/2011
2:20 PM
Case studies of easterly wave disturbances over northeast Brazil using the Eta model
This research aims to analyze two easterly wave disturbance events that reached the east coast of Northeast Brazil (NEB) on 15 May 2005 and 20 June 2006. The performance of the regional Eta Model was evaluated through four sets of experiments using different horizontal resolutions (10 and 40 km) and...
por Portal Padrão
publicado
22/08/2011
2:18 PM
The droughts of 1996-1997 and 2004-2005 in Amazonia: hydrological response in the river main-stem
Severe hydrological droughts in the Amazon have generally been associated with strong El Niño events. More than 100 years of stage record at Manaus harbour confirms that minimum water levels generally coincide with intense warming in the tropical Pacific sea waters. During 2005, however, the Amazon...
por Portal Padrão
publicado
22/08/2011
2:17 PM
Using fuzzy cognitive maps to describe current system dynamics and develop land cover scenarios: a case study in the Brazilian Amazon
In this study we developed a methodology to identify and quantify the relationships among determinants of land cover change using a regional case study in the Brazilian Amazon. The method is based on the application of fuzzy cognitive maps (FCMs), a semi-quantitative tool that provides a structured ...
por Portal Padrão
publicado
22/08/2011
2:15 PM
Verificação das previsões de tempo para precipitação usando ensemble regional para o estado do Ceará em 2009
Este artigo apresenta um estudo de verificação das previsões de chuva de um sistema de previsão do tempo por ensemble regional. O conjunto é composto por seis membros, dos quais quatro utilizam o modelo RAMS 6.0 e dois usam o WRF 3.1, inicializados com dados dos modelos globais do CPTEC ou GFS ...
por Portal Padrão
publicado
22/08/2011
2:13 PM
Evaluation of soil moisture from satellite observations over South America
A study was performed to evaluate the surface soil moisture derived from Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E) sensor observations over South America. Other soil moisture and rainfall datasets were also used for the analysis. The information for the soil data...
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