ABSTRACT This study presents the daily atmospheric circulation patterns at surface and altitude related to the South Atlantic Convergence Zone (SACZ) events that occurred between 2007 and 2017. For this analysis, Principal Pattern Sequence Analysis (PPSA) and sea level pressure and geopotential height reanalysis were used. Four typical atmospheric ...
A energia do Sol que chega ao sistema Terra-atmosfera gera energia potencial que é convertida em outras formas de energias que estão associadas às intensidades das tempestades (EC) e finalmente dissipada pelo atrito e pelos vórtices turbulentos. Durante este processo de geração e conversão de energia, sistemas como ZCAS podem se formar. As ZCAS são...
Esse estudo teve como objetivo identificar os eventos extremos de precipitação diária na mesorregião metropolitana de Belo Horizonte (MG) em dias de ocorrência de Zona de Convergência do Atlântico Sul (ZCAS). Para tanto, utilizaramse uma base de dados de episódios de ZCAS e dados diários de precipitação de 3 estações meteorológicas no período de ou...
Published in Climate Dynamics
The South Atlantic Convergence Zone (SACZ) plays a key role in the South American monsoon system (SAMS) precipitation regime, and accounts for around 25% of the rainfall volume over Southeast Brazil between October and April, on average, with peaks of 56% in March and 41% in January. Due to its often varying position and multi-variable structure, d...
The aim of this study was to analyse the characteristics of an intense rainfall event that occurred in the Paraíba do Sul river basin, southeast Brazil, in early 2000. Rainfall data from conventional meteorological stations and automatic weather stations, satellite images and datasets from the Climate Forecast System Reanalysis, National Centers fo...
Published in Climate Dynamics
The seasonal cycle of the intraseasonal (IS) variability of precipitation in South America is described through the analysis of bandpass filtered outgoing longwave radiation (OLR) anomalies. The analysis is discriminated between short (10–30 days) and long (30–90 days) intraseasonal timescales. The seasonal cycle of the 30–90-day IS variability can...
Published in Climate Dynamics
The response of the South Atlantic Convergence Zone (SACZ) to an extratropical thermal forcing is investigated in a series of simulations performed with an atmospheric general circulation model coupled to a slab ocean model. Three sets of experiments are performed, varying the extratropical forcing. In the first the forcing consists of warming of t...
Published in Climate Dynamics
The prediction skill of subseasonal forecast models is evaluated for a strong and long-lasting heat wave occurred in December 2013 over Southern South America. Reforecasts from two models participating in the WCRP/WWRP Subseasonal to Seasonal project, the Bureau of Meteorology POAMA and Beijing Climate Center model BCC-CPS were considered to evalua...
Published in Natural Hazards
The South American monsoon system (SAMS) plays a fundamental role in the precipitation regime of the most populous and economically important regions in Brazil. The South Atlantic Convergence Zone (SACZ) is a main component of the SAMS, characterizing its active phase, and is often associated with intense rainfall events: Strong and persistent epis...
Published in Frontiers in Environmental Science
The South Atlantic Convergence Zone (SACZ) is the dominant summertime cloudiness feature of subtropical South America and the western South Atlantic Ocean, having a significant influence on the precipitation regime of southeastern Brazil. This paper proposes an objective criterion based mainly on precipitation, as this variable is easily obtained o...
