Investigation into the application of wavelet transform in the study of turbulent exchanges in the surface boundary layer of the atmosphere

• Grant number: 93/02715-1
• Support Opportunities: Regular Research Grants
• Start date: December 01, 1993
• End date: March 31, 1996
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Meteorology
• Principal Investigator: Leonardo Deane de Abreu Sá
• Grantee: Leonardo Deane de Abreu Sá
• Host Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia e Inovação (Brasil). São José dos Campos , SP, Brazil

Abstract

The recent advent of the theoretical formulation of the wavelet transform (WT) constitutes a very important advance in the analysis of the turbulent signal, since it enables the evolutive spectral decomposition, which it is not possible to obtain with the traditional Fourier transform. Given its recent character, only since the 90s decade has WT come to be used in the study of turbulent signal, opening a broad perspective for the better understanding of the structures in dissipative processes. However, its application to atmospheric signals is still very rare in the literature. The aim of this project consists in contributing to a better understanding of the physical processes of turbulent exchange in the atmospheric surface boundary layer based on the application ofWT to the study of turbulent signal sampled at high frequencies. It is intended: 1) to implement algorithms which enable a multi-resolution decomposition of the signal based on the WT; 2) to study the specific characteristics of turbulent exchange above and within the forest; 3) to determine with better precision the error associated with estimation of the turbulent fluxes in the atmosphere; 4) to better understand the statistical distributions associated with the various turbulent parameters of the atmospheric surface boundary layer. (AU)