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Synoptic patterns of atmospheric circulation associated with intense precipitation events over the Brazilian Amazon

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Abstract

The objective of this study is to characterize the atmospheric patterns associated with the occurrence of intense precipitation events (IPE) in different sub-regions of the Brazilian Amazon. Intense rainfall cases over six sub-regions were selected from a precipitation data set for the period from 1983 to 2012. The composition technique was used to characterize the prevailing atmospheric patterns for the occurrence of IPE. In the south of the Amazon, the composition fields showed a favorable configuration for the formation of the South Atlantic Convergence Zone (SACZ). Along the coast, the intense precipitation events must be associated with mesoscale systems, such as squall lines. In the northwest, they are apparently associated with the Intertropical Convergence Zone (ITCZ) and/or local convection. The results reveal the complexity of the synoptic environment associated with the formation and development of weather systems that produce heavy rainfall in the Amazon Basin. Several factors can interfere as conditions in large-scale, local conditions and thermodynamic factors.

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  1. Programa de Pós-graduação em Ciências Climáticas, Universidade Federal do Rio Grande do Norte, Campus Universitário Lagoa nova, caixa postal 1524, Natal, RN, 59078-970, Brazil

    Eliane Barbosa Santos, Paulo Sérgio Lucio & Cláudio Moisés Santos e Silva

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  1. Eliane Barbosa Santos
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  2. Paulo Sérgio Lucio
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  3. Cláudio Moisés Santos e Silva
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Correspondence to Eliane Barbosa Santos.

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Santos, E.B., Lucio, P.S. & Santos e Silva, C.M. Synoptic patterns of atmospheric circulation associated with intense precipitation events over the Brazilian Amazon. Theor Appl Climatol 128, 343–358 (2017). https://doi.org/10.1007/s00704-015-1712-7

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