Caracterização da transição da convecção rasa para profunda na Amazônia Central no âmbito do experimento GoAmazon2014/5

• Ano de defesa: 2017
• Autor(a) principal: Alves, Carlos Felipe Cacione [UNIFESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo
• Palavras-chave em Português: Shallow-to-deep convection; Water vapor convergence; GoAmazon2014/15; Statistical data analysis; Tropical convection; Transição rasa-profunda; Convergência de vapor d’agua; Análise estatística de dados; Convecção tropical
• Link de acesso: https://sucupira.capes.gov.br/sucupira/public/consultas/coleta/trabalhoConclusao/viewTrabalhoConclusao.jsf?popup=true&id_trabalho=5743508; http://repositorio.unifesp.br/handle/11600/49990

The tropical region plays a fundamental role in the global climate, contributing to the maintenance of the general circulation of the atmosphere and the hydrological cycle, as well as having one of the highest evapotranspiration values on the planet. In this context, convective systems are extremely important for the variability of the hydrological cycle in the region. Although knowledge about the Amazonian ecosystem has advanced significantly after the Large-scale Biosphere Atmosphere (LBA) experiment, full understanding of its role is still far from complete. The purpose of this work is to study the dynamics of the various atmospheric variables involved with convective clouds cycle in Central Amazon during the years of the international campaign GoAmazon2014/15, focusing on the shallow to deep convective transition. This work proposes an alternative method of identifying deep convection events based exclusively on GOES satellite images using the IR channel and shows results of water vapor convergence, using precipitable water vapor (PWV), compatible with previous studies done with GPS/GNSS network. Furthermore the analysis of the dynamics of the cloud condensation level (LCL) with the level of free convection (LFC) indicates that the deep convection event is already organized two hours before precipitation, and could no longer be reversed. With respect to the transition from shallow to deep convection, the result of this work indicated that PWV convergence occurs gradually, unlike previous works that indicate only two distinct regimes. In addition, contrary to what was expected, the analysis of the mean relative humidity (RH) profile in the rainy season did not indicate the RH at medium levels as the control agent of the transition from shallow to deep convection in wet season.