Wind speed peaks and their relationship with the increase of scalar flows in the tropical night atmosphere: a case study




Wind peaks, Nocturnal boundary layer, Scalar flows, Amazonian forest, phase space


Some physical aspects related to the occurrence of nocturnal instability-inducing intense peaks in wind speed (here abbreviated by PV.) in the tropical atmosphere above forest were investigated. Such phenomena cause strong variations in turbulent signals, occurrence of strong turbulence regimes, and significant increases in scalar fluxes. Was found that these events that occur during strong turbulence regimes can be preceded and succeeded by low frequency oscillations in environmental variables and that the significant increase in scalar fluxes observed is associated with the existence of a relative maximum wind speed value (). Procedures are applied to the data used here to enable the construction of phase space diagrams in order to better analyze the increase in amplitude of low frequency oscillations observed before PV outbreak, as well as the decrease in amplitude after PV. The aforementioned phase diagrams are used to obtain repulsor and attractor limit cycles, which respectively precede and succeed the peaks in wind speed. Weather radar images are also used to further investigate the studied atmospheric phenomenon.


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Author Biographies

Francisco Otávio Miranda, Universidade do Estado do Amazonas, Parintins, AM

Doutor em Clima e Ambiente, Instituto Nacional de Pesquisas da Amazonia - INPA, PPG-CLIAMB

Leonardo Deane de Abreu Sá, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP

Doutor em Física da Atmosfera - Universite de Toulouse III (Paul Sabatier)

Celso von Randow, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP

Doutor em Ciências Ambientais pela Universidade de Wageningen, Holanda

Fernando M. Ramos, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP

Doutor em Mecânica dos Fluidos, Escola Nacional de Aeronáutica e Espaço (ENSAE-SUPAERO), França

Antônio O. Manzi, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP

Doutor em Física da Atmosfera pela Universidade Paul Sabatier (Toulouse III), França


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How to Cite

Miranda, F. O., Sá, L. D. de A., Randow, C. von, Ramos, F. M., & Manzi, A. O. (2020). Wind speed peaks and their relationship with the increase of scalar flows in the tropical night atmosphere: a case study. Ciência E Natura, 42, e12.

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