Numerical Weather Prediction
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Verificação da previsão do tempo em São Paulo com o modelo operacional WRF / Review of weather in São Paulo with the WRF Operational Model.
Forecasts of daily maximum and minimum temperatures and rainfall performed by the operational numerical weather prediction WRF (Weather Research Forecasting) model in the São Paulo are evaluated. Initial and boundary conditions provided by the 00UTC Global Forecast System (GFS) Model and WRF run for 72 hours, with two nested grids (with horizontal grid spac
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/11/2012
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2. Impacto da TSM de alta resolução em simulações de previsão numérica do tempo na região da confluência Brasil-Malvinas / The impact of high resolution SST in numerical weather prediction simulations in Brazil-Malvinas confluence region
Este estudo investiga os processos de interação oceano-atmosfera afetos à temperatura da superfície do mar (TSM), como condição de contorno em um modelo de previsão numérica do tempo (PNT), na circulação atmosférica. Para tal, foi utilizado o banco de dados de TSM de alta resolução (0,05°) Operational Sea Surface Temperature and Sea Ice Analysi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/12/2011
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3. Assimilação de dados com redes neurais artificiais em modelo de circulação geral da atmosfera / Data assimilation with artificial neural networks in atmospheric general circulation model
Weather forecasting systems require a model for the time evolution and an estimate of the current state of the system. The numerical weather prediction (NWP) incorporates the equations of atmospheric dynamics with physical process and it can predict the future state of the atmosphere. Data assimilation provides such an initial estimate of the atmosphere wher
Publicado em: 2010
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4. The impact of the use of high spatial resolution sea surface temperature data in a numerical weather prediction model / Impacto da utilização de dados de temperatura da superfície do mar de alta resolução espacial em um modelo de previsão numérica do tempo
Sea surface temperature (SST) is an important indicator of Earth´s climate. An accurate and global measurement of this parameter is of fundamental importance in applications related to climate studies, ocean-atmosphere interactions, marine ecosystem, etc. Special attention may be given to meteorological forecasts, where SST stands as an important boundary c
Publicado em: 2009
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5. Estudo das características das perturbações EOF extratropicais e seu impacto na previsão de tempo de médio prazo por conjunto
- The characteristics of the extratropical EOF perturbations are studied and their impact on the medium range ensemble weather prediction is evaluated, using simulations with the Center for Weather Prediction and Climate Studies Ensemble Weather Prediction System (CPTEC-EPS). The EOF method, originally applied over tropical regions and for horizontal wind an
Publicado em: 2008
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6. Sistema de previsão imediata da precipitação: o hydrotrack / A rainfall nowcasting system: the hydrotrack
The knowledge of convective system evolution is of fundamental importance for understanding weather and climate, particularly in the tropics, and it is essential to improve forecasting of these systems to reduce vulnerability to extreme weather damage. The identification of predictor parameters of the evolution of convective system, based on its previous evo
Publicado em: 2008
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7. Sensibilidade do uso de "Pseudo-temps" na assimilação de dados do modelo de circulação geral atmosférica do CPTEC/COLA / Sensitivity using "pseudo-temps" in the data assimilation of the atmospheric global circulation model of the CPTEC/COLA
Using the data assimilation system Physical-space Statistical Analysis System with the Atmospheric Global Circulation Model Pseudo-Temps are used to generate initial conditions to integrate this model. The use of Pseudo-Temps aims to improve the model representation of the atmospheric conditions over South America. In this region there is a lack of radiosson
Publicado em: 2006
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8. Sensibilidade do uso de "Pseudo-temps" na assimilação de dados do modelo de circulação geral atmosférica do CPTEC/COLA / Sensitivity using "pseudo-temps" in the data assimilation of the atmospheric global circulation model of the CPTEC/COLA
Utilizando o sistema de assimila¸cao de dados Physical-space Statistical Analysis System em conjunto com o Modelo de Circulação Geral da Atmosfera, aplica-se o uso das Pseudo-Temps na geração da condição inicial utilizada para integrar deste modelo. O uso das Pseudo-Temps busca uma melhor representação, por parte do modelo, dos fenomenos atmosféric
Publicado em: 2006
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9. Analyses of the satellite sounding data assimilation process and the impact on weather forecast using a physical-space statistical analysis system. / Análise do procedimento de assimilação de sondagens derivadas de satélites e de seu impacto na previsão de tempo utilizando um sistema estátístico em espaço físico
Many studies on evaluation of the impact of satellite sounding on forecasts, made by different institutions around the World, have shown that this kind of data are very important to improve the quality of weather forecasting in Southern Hemisphere. There are many methods of data assimilation and models of weather forecasting. In this study we used an adaptat
Publicado em: 2003
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10. Frontogenesis over south america and precursors for the cold surges in the state of São Paulo / Frontogênese na América do Sul e precursores de friagem no estado de São Paulo
Intense cold air incursions in São Paulo (freezes) occur on the average once a year during the months of April through September and 80% during the months of May through August. The central part of the South American continent is frontogenetic due to the horizontal deformation field in the lower troposphere on winter. Composites of the frontogenesis functio
Publicado em: 2003
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11. Inicialização física em modelos de previsão de tempo e estudo de seus efeitos na partição de energia em modos verticais e horizontais nos trópicos e na América do Sul / Physical initialization in weather prediction models and study of its effects on the energy partition the vertical and horizontal modes over the tropics and South Americar
Physical initialization was developed at The Florida State University to improve rainfall forecast over tropical region by numerical weather prediction models. III this initialization procedure, observed rainfall rates are assimilated using reverse cumulus algorithms and nudging. At the end of the assimilation period - usually 24 hours - the model will be ab
Publicado em: 2002
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12. Assimilacao de informacao de radiâncias em modelos de previsao númerica do tempo utilizando um sistema de análise objetiva estatístico em espaco-físico / Assimilation of radiances information in numerical weather prediction model using a physical space statistical analysis system
The use of radiances in data assimilations systems can be of two forms: direct assimiliation, or they may be pre-processed to retrieve geophysical parameters, like temperature or humidity for subsequent assimilation. The second process involved the invertion of a radiative transfer equation that is ill-posed, and therefore requires the use of prior informati
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 200010