Navegando por Assunto "Modelo OLAM"

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Acesso aberto (Open Access)
Climate estimates for Eastern Amazon with OLAM model
(2014-12) SILVA, Renato Ramos da; VITORINO, Maria Isabel; KUHN, Paulo Afonso Fischer; ANANIAS, Daniela dos Santos
The OLAM model has as its characteristics the advantage to represent simultaneously the regional and global meteorological phenomena using a refining grid scheme. During REMAM project OLAM was applied for a few case studies with the goal to evaluate its performance to estimate the regional climate for the eastern Amazon during periods of El Niño and La Niña. Case studies were performed for the rainy periods of the years 2010 and 2011 that were driven by distinct oceanic conditions. Initially, the model results were compared with local observations. The results demonstrated that OLAM was able to represent well the major precipitating regions, the diurnal temperature cycle evolution, and the wind dynamics. After that, analysis of the results demonstrated that if we provide good initial conditions and a good representation of the sea surface temperature evolution, OLAM is able to forecast with two or three months in advance if a rainy season would be wet or dry.
Acesso aberto (Open Access)
Modelo OLAM (ocean-land-atmosphere-model): descrição, aplicações, e perspectivas
(2009-06) SILVA, Renato Ramos da; DIAS, Pedro Leite Silva; MOREIRA, Demerval Soares; SOUZA, Everaldo Barreiros de
The OLAM model was developed to extend the capability to represent the global and regional scale phenomena simultaneously. The model presents innovations regarding to the dynamic processes, grid configuration, memory structure, and numerical technique solutions for the prognostics equations. The Navier-Stokes equations are solved using the finite volume technique that conserves mass, momentum, and energy. In this study the OLAM model is described, and results are presented for its application on the climate mode to simulate the monthly prediction of precipitation for South America and numerical weather prediction. The results show that the model is able to represent reasonable the large scale meteorological processes. In general, its performance improves when grids of greater resolution is adopted, for which significant improvements are observed for the monthly precipitation simulation estimates as for the numerical weather prediction.
Acesso aberto (Open Access)
Weather forecasting for Eastern Amazon with OLAM model
(2014-12) SILVA, Renato Ramos da; GANDU, Adilson Wagner; COHEN, Júlia Clarinda Paiva; KUHN, Paulo Afonso Fischer; MOTA, Maria Aurora Santos da
The OLAM model has as its characteristics the advantage to represent simultaneously the global and regional meteorological phenomena using the application of a grid refinement scheme. During the REMAM project the model was applied for a few case studies to evaluate its performance on numerical weather prediction for the eastern Amazon region. Case studies were performed for the twelve months of the year of 2009. The model results for those numerical experiments were compared with the observed data for the region of study. Precipitation data analysis showed that OLAM is able to represent the average mean accumulated precipitation and the seasonal features of the events occurrence, but can't predict the local total amount of precipitation. However, individual evaluation for a few cases had shown that OLAM was able to represent the dynamics and forecast a few days in advance the development of coastal meteorological systems such as the squall lines that are one of the most important precipitating systems of the Amazon.