Mesoscale convective systems over the Amazon basin. Part I: climatological aspects

Autor(es)

Rehbein, Amanda ^[1] ; Ambrizzi, Tercio ^[1] ; Mechoso, Carlos Roberto ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geophys & Atmospher Sci, Rua Matao 1226, BR-05508090 Sao Paulo, SP - Brazil

^[2] Univ Calif UCLA, Dept Atmospher & Ocean Sci, Los Angeles, CA - USA

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF CLIMATOLOGY; v. 38, n. 1, p. 215-229, JAN 2018.
• Citações Web of Science: 3

Resumo

Mesoscale convective systems (MCSs) over the Amazon basin provide a large contribution to regional precipitation, which strongly influences the maintenance of unique ecosystems. Despite the importance of these MCSs, their characteristics are not well described in the literature. The present study uses a 14-year long (2000-2013) data set of high-resolution (4km; 30min) infrared satellite images to compile a climatology of MCSs that during the period of analysis were within the borders of the Amazon basin at some point in their lifespan. MCSs that originated over the continent and the ocean are considered separately. It is found that on average about 7200 continental and 50 oceanic MCSs occurred per year in the Amazon basin. The majority (minority) of continental (oceanic) MCSs completed their lifecycles between 3 and 5.5h. These MCSs are studied separately from those with lifespan longer than 6h. Continental and oceanic MCSs over the Amazon occurred primarily during austral summer and autumn-winter, respectively. The preferred regions and time for genesis of continental and oceanic MCSs are identified. The average area, propagation speed and direction of displacement for MCSs in the different stages of their lifecycle are also examined. (AU)

• Processo FAPESP: 16/10557-0 - Sistemas convectivos de mesoescala sobre a bacia Amazônica: clima presente e projeções futuras em cenário de mudanças climáticas
• Beneficiário: Amanda Rehbein
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/50521-7 - Processos de multi-escala que atuam na convecção tropical e a influência de aerossóis
• Beneficiário: Tercio Ambrizzi
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular