Características Espectrais e Similaridade na Camada Limite Superficial sobre Floresta Manejada: FLONA Tapajós Km 83

Abstract

The surface boundary layer (CLS) is the region of the atmospheric boundary layer (CLA) occur where the main energy transfers and masssa between the surface and the atmosphere. These exchanges, in short, are carried by turbulent process. hese exchanges, in synthesis, are realized by the turbulence process. The turbulence has its structure commonly characterized on the most different surface conditions through the turbulent kinetic energy spectrum. Characterize the structure of turbulence is crucial for get a more realistic description of the dynamics of CLA and consequently improve the numerical models of pollutant dispersion and understand the transfer of quantities such as water vapor, carbon dioxide and other scalars, fundamental in regulation of climate and time of a surface. For the Amazon, still, are little the information of the structure turbulence over Amazonian ecosystems. Therefore objectived-if to analyze the behavior spectral and coespectral of the turbulence over area of forest in different classes of atmospheric stability (stable, neutral and unstable), and check the validity of the theory of Monin and Obukhov similarity for the CLS. For this we used a dataset which comprises 117 days of the year 2009, of the periods rainy and dry, measured by sensors for rapid responses (system Eddy- Covariance), willing in a micrometeorological tower. The tower is located within the Tapajós National Forest in managed forest (km 83). Through analysis sazonal of the functions non-dimensional, * / u w w e / | | * T e 2 * kz / u which correspond, respectively, the intensity of the mechanical and thermal turbulence, and rate by the which energy produced is dissipated in the CLS, noted-if that the behavior of the functions w and is similar to that described for area of terrain homogeneous. Differently from function , which has a behavior non similar to that described in the literature, but strongly dependent of the parameter of stability z/L. Besides the functions have similar behaviors in different periods, rainy and dry. Thus, regarding the intensity of turbulence and the rate of energy dissipation, can conclude that the scales of the TSMO, the scales of the TSMO, are scales appropriate to describe the non-dimensional functions w , e in the CLS about the area of managed forest and the behavior of the nonadimensional functions not depend of the seasonality.