Effects of Vegetation and Topography on the Boundary Layer Structure above the 
Amazon Forest

Chamecki, Marcelo; Freire, Livia S.; Dias, Nelson L.; Chen, Bicheng; Dias-Junior, Cleo Quaresma; Toledo Machado, Luiz Augusto; Sörgel, Matthias; Tsokankunku, Anywhere; de Araujo, Alessandro C.

doi:10.1175/JAS-D-20-0063.1

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Effects of Vegetation and Topography on the Boundary Layer Structure above the Amazon Forest

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Sörgel, Matthias
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Tsokankunku, Anywhere
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Chamecki, M., Freire, L. S., Dias, N. L., Chen, B., Dias-Junior, C. Q., Toledo Machado, L. A., et al. (2020). Effects of Vegetation and Topography on the Boundary Layer Structure above the Amazon Forest. Journal of the Atmospheric Sciences, 77(8), 2941-2957. doi:10.1175/JAS-D-20-0063.1.

Cite as: https://hdl.handle.net/21.11116/0000-0007-9F89-C

Abstract

Observational data from two field campaigns in the Amazon forest were used to study the vertical structure of turbulence above the forest. The analysis was performed using the reduced turbulent kinetic energy (TKE) budget and its associated two-dimensional phase space. Results revealed the existence of two regions within the roughness sublayer in which the TKE budget cannot be explained by the canonical flat-terrain TKE budgets in the canopy roughness sublayer or in the lower portion of the convective ABL. Data analysis also suggested that deviations from horizontal homogeneity have a large contribution to the TKE budget. Results from LES of a model canopy over idealized topography presented similar features, leading to the conclusion that flow distortions caused by topography are responsible for the observed features in the TKE budget. These results support the conclusion that the boundary layer above the Amazon forest is strongly impacted by the gentle topography underneath.