Ciclo diário e semidiário de precipitação na costa norte do Brasil

Silva, Cláudio Moisés Santos e

doi:10.1590/s0102-77862013000100004

Cited by 7 publications

References 40 publications

(36 reference statements)

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Precipitation regionalization of the Brazilian Amazon

Santos

Lúcio

Silva

2014

Atmospheric Science Letters

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The Brazilian Amazon is a large territory, where different weather systems act, contributing to non-homogeneity of the rainfall seasonal distribution in the region. The aim of this study is to determine sub-regions of homogeneous precipitation in the Amazon, linking them to the main atmospheric systems that affect the rainfall in the region. For this, hierarchical cluster analysis was applied on a data set composed by 305 rain gauges. The results suggest that the Brazilian Amazon has six pluvial homogeneous regions.

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Precipitation regionalization of the Brazilian Amazon

Santos

Lúcio

Silva

2014

Atmospheric Science Letters

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Daily Cycle of Precipitation over the Northern Coast of Brazil

Brito

Oyama

2014

Journal of Applied Meteorology and Climatology

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The daily cycle of precipitation (DCP) in the austral autumn on the northern coast of Brazil (NCB) is examined in detail. The Tropical Rainfall Measuring Mission 3B42 dataset was used to obtain the DCP, and the intradaily variability was measured using the coefficient of variation (CV). The DCP data of the NCB were grouped into five regimes. A new regime was found, called the shore regime. It has a minimum CV, and its cycle shows both continental (late afternoon peak) and oceanic features (morning peak). The landside coastal regime was divided into two areas: a continental coast regime, with very high CV, and an inland coast regime, with clear inland phase propagation. The continental regime was divided into two categories: an inland regime with low and high variability. The Forecast and Tracking of the Evolution of Cloud Clusters (ForTraCC) data were used to relate convective systems (CS) and their processes to the DCP. The following processes are studied for the CS: initiation/dissipation, merge/split, area increase/reduction, and advection. Initiation is more concentrated in time, while dissipation is more distributed. Physical mechanisms that generate initiation can promote area expansion and hence CS merge. By considering a simple parameterization, the time scale of the CS area reduction under environmental conditions that are unfavorable to initiation ranges from 6 to 12 h. Therefore, there is upscaling of the CS in the afternoon and slow decay during the night and morning, which leads to a more uniform cycle inland.

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Impacto de um mecanismo de disparo da convecção na precipitação simulada com o modelo regional BRAMS sobre a bacia amazônica durante a estação chuvosa de 1999

Silva

Freitas

2015

Rev. bras. meteorol.

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O objetivo deste artigo é mostrar o impacto da implementação de uma função de disparo da convecção na parametrização convectiva de Grell e Devenyi, contida no modelo atmosférico regional BRAMS (Brazilian developments on Regional Atmospheric Model). Para verificar o ciclo de precipitação foi usado um conjunto de dados do período chuvoso de 1999 no âmbito do projetoLarge scale Biosphere-Atmosphere Experiment in Amazonia(LBA). A nova função de disparo de convecção é acoplada aos fluxos de calor sensível e latente à superfície. Além disso, possui a vantagem de considerar a média dos primeiros 60 hPa da troposfera para caracterizar a ascenção pseudo adiabática da parcela. Assim, a parcela em ascenção apresenta redução daConvective Available Potential Energy (CAPE), o modelo acumula menos CAPE nas primeiras horas do dia e com isso, o máximo de precipitação é atrasado (embora dependa da região analisada). Um aspecto negativo foi que a precipitação sobre a Cordilheira dos Andes aumentou relativamente à versão original. Conclui-se que o esquema apresenta vantagens e desvantagens e que faz-se necessário avaliar outras parametrizações do modelo, principalmente a troca de energia e massa na interface solo-vegetação-atmosfera a fim de se obter resultados mais realísticos da precipitação sobe a Amazônia.

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Ciclo diário e semidiário de precipitação na costa norte do Brasil

Cited by 7 publications

References 40 publications

Precipitation regionalization of the Brazilian Amazon

Precipitation regionalization of the Brazilian Amazon

Daily Cycle of Precipitation over the Northern Coast of Brazil

Impacto de um mecanismo de disparo da convecção na precipitação simulada com o modelo regional BRAMS sobre a bacia amazônica durante a estação chuvosa de 1999

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