Navegando por Assunto "Potential temperature"

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Características da estabilidade estática e dinâmica da atmosfera em cultivo de palma de óleo no Leste da Amazônia
(Universidade Federal do Pará, 2020-09-30) CIRINO, Luciana dos Santos; ARAÚJO, Alessandro Carioca de; http://lattes.cnpq.br/6188087583954899; https://orcid.org/0000-0002-7361-5087
Considering the constant land use changes in the Amazon region, which determine the microclimate variability, the oil palm cultivation plays important roles in the environmental context and its interactions with the atmosphere. In this sense, this work aims to investigate the behavior of the atmospheric layer over an oil palm intercrop with interspecific hybrids (HIE) (Elaeis guineensis Jacq. x Elaeis oleifera (Kunth) Cortés) in eastern Amazonia. The study was conducted in the company Marborges Agroindústria S.A., located in Moju, Pará. The age of the plantation was 8 years (in 2014), and the average height of the top of the canopy was approximately 8 m. The data used in this work were obtained by a micrometeorological tower, and comprise the period from January to December 2014. During the daytime period, the highest potential temperatures (θ) were observed at the heights of 2.25 m and 6.75 m above the ground, indicative of static instability. Unlike the night period, where the values of θ were higher above the top of the canopy, indicative of static stability. The less rainy period presented higher wind speeds, with a difference of 1 m/s in relation to the rainy period of the region. Through air temperature and wind speed data the static and dynamic weather conditions over the crop were investigated. Atmospheric conditions of neutrality and stability predominated in both periods (-0.25 < Ri > 0.25).