We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Spikes in wind speed and their relationship to increases in scalar flows in the night tropical atmosphere: Case study.
- Authors
Miranda, Francisco Otávio; de Abreu Sá, Leonardo Deane; von Randow, Celso; Ramos, Fernando M.; Manz, Antônio O.
- Abstract
Some physical aspects related to the occurrence of intense peaks in the wind speed were investigated, inducing instability (here abbreviated by PV wind peaks) at night in the tropical atmosphere above the forest. Such phenomena cause strong variations in turbulent signals, occurrence of strong turbulence regimes, in addition to significant increases in scalar flows. It was verified that these events that occur during strong turbulence regimes can be preceded and followed by low frequency oscillations in the environmental variables and that the significant increase in the scalar flows verified is associated with the existence of a relative maximum wind speed (~ 14 ms -1). Procedures are applied to the data used here in order to enable the construction of diagrams in phase spaces in order to better analyze the increase in the amplitude of low frequency oscillations observed before the outbreak of PV, as well as the decrease in amplitude seen after PV. The aforementioned phase diagrams are used to obtain repulsor and attractor cycles, which respectively precede and follow PV. Weather radar images are also used to better investigate the studied atmospheric phenomenon.
- Subjects
WIND speed; PHASE space; RADAR meteorology; PHASE diagrams; ATMOSPHERE
- Publication
Revista Ciência e Natura, 2020, Vol 42, p1
- ISSN
0100-8307
- Publication type
Article
- DOI
10.5902/2179460X45354