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Your search keyword '"Silva Dias, P. L."' showing total 6 results
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6 results on '"Silva Dias, P. L."'

1. The Brazilian developments on the Regional Atmospheric Modeling System (BRAMS 5.2): an integrated environmental model tuned for tropical areas.

Author

Freitas, Saulo R, Panetta, Jairo, Longo, Karla M, Rodrigues, Luiz F, Moreira, Demerval S, Rosário, Nilton E, Silva Dias, Pedro L, Silva Dias, Maria AF, Souza, Enio P, Freitas, Edmilson D, Longo, Marcos, Frassoni, Ariane, Fazenda, Alvaro L, Santos E Silva, Cláudio M, Pavani, Cláudio AB, Eiras, Denis, França, Daniela A, Massaru, Daniel, Silva, Fernanda B, Cavalcante, Fernando, Pereira, Gabriel, Camponogara, Gláuber, Ferrada, Gonzalo A, Campos Velho, Haroldo F, Menezes, Isilda, Freire, Julliana L, Alonso, Marcelo F, Gácita, Madeleine S, Zarzur, Maurício, Fonseca, Rafael M, Lima, Rafael S, Siqueira, Ricardo A, Braz, Rodrigo, Tomita, Simone, Oliveira, Valter, and Martins, Leila D

Subjects
Earth Sciences
Abstract

We present a new version of the Brazilian developments on the Regional Atmospheric Modeling System where different previous versions for weather, chemistry and carbon cycle were unified in a single integrated software system. The new version also has a new set of state-of-the-art physical parameterizations and greater computational parallel and memory usage efficiency. Together with the description of the main features are examples of the quality of the transport scheme for scalars, radiative fluxes on surface and model simulation of rainfall systems over South America in different spatial resolutions using a scale-aware convective parameterization. Besides, the simulation of the diurnal cycle of the convection and carbon dioxide concentration over the Amazon Basin, as well as carbon dioxide fluxes from biogenic processes over a large portion of South America are shown. Atmospheric chemistry examples present model performance in simulating near-surface carbon monoxide and ozone in Amazon Basin and Rio de Janeiro megacity. For tracer transport and dispersion, it is demonstrated the model capabilities to simulate the volcanic ash 3-d redistribution associated with the eruption of a Chilean volcano. Then, the gain of computational efficiency is described with some details. BRAMS has been applied for research and operational forecasting mainly in South America. Model results from the operational weather forecast of BRAMS on 5 km grid spacing in the Center for Weather Forecasting and Climate Studies, INPE/Brazil, since 2013 are used to quantify the model skill of near surface variables and rainfall. The scores show the reliability of BRAMS for the tropical and subtropical areas of South America. Requirements for keeping this modeling system competitive regarding on its functionalities and skills are discussed. At last, we highlight the relevant contribution of this work on the building up of a South American community of model developers.

Published
2017

3. Climatology of easterly wave disturbances over the tropical South Atlantic

Author

Gomes, H. B., Ambrizzi, T., Pontes da Silva, B. F., Hodges, Kevin, Silva Dias, P. L., Herdies, D. L., and Silva, M. C. L.

Abstract

A 21-yr climatology of Easterly Waves Disturbances (EWDs) over the Tropical South Atlantic (TSA) has been examined using data from the European Centers for Medium-Range Weather Forecasting (ECMWF) interim reanalysis (ERAI) and satellite data. This includes the frequency distribution of EWDs and their interannual variability. The large-scale environment associated with EWDs has been investigated for the coastal region of Northeast Brazil (NEB) for the rainy (April-August) season using a composite analysis. To better understand the life cycle of EWDs, an automated tracking scheme has been used to track vorticity centers associated with the EWDs in the ERAI data. EWDs were first identified in ERAI, resulting in 518 observed cases. These were found to show notable interannual variability with around 16-40 episodes by year and with average lifetime of 4-6 days. Of the identified EWDs, 97% reached the coast of NEB, of which 64% were convective in nature and 14% moved across the NEB region and reached the Amazon. The annual occurrence of EWDs seems to be lower (higher) during El Niño (La Niña). The monthly occurrence of EWDs shows higher activity in the rainy season. EWDs originate in association with five types of system: cold fronts, convective clusters from the west coast of Africa, Intertropical Convergence Zone and Tropical Upper Tropospheric Cyclonic Vortices. The composite analysis presents strong relative vorticity (RV) and divergence anomalies at low levels, as well as in the vertical profiles of relative humidity and vertical velocity (omega). The precipitation composites show that the EWDs propagate between the TSA and NEB and contribute at least 60% of the total rainfall over the east coast of NEB throughout the rainy season.

Published
2019

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