Air turbulence characteristics at multiple sites in and above the Amazon rainforest canopy
Abstract
Atmospheric turbulence characteristics within and above rain forest canopies are investigated at several sites located in the Amazon region of Brazil. Turbulence data provided by bi- and three-dimensional sonic anemometers, which were deployed at heights ranging from near the forest floor to about 80 m, are analyzed to describe the principal features of atmospheric turbulence, sensible heat flux (H), and components of the turbulent kinetic energy (TKE) budget equation. The analyses focused on weak (WW) and strong (SW) wind conditions to achieve the research objectives of evaluating the turbulence structure above and below the rain forest canopy and estimating the degree of coupling between air layers above the forest and deep in the canopy. Turbulence statistical moments show that atmospheric eddies, generated above the canopy, hardly penetrate the region below 0.5h (h is the canopy height). Forest-atmosphere exchanges of heat differ depending on the observed wind regimes. Sensible heat fluxes decrease with canopy depth for SW conditions and are approximately constant with the height for WW above the canopy. Sensible heat flux profiles reveal a transition layer (around 0.6h) which sometimes exchanges heat with the upper and sometimes with the lower forest canopy, depending on time of day and weathermore »
- Authors:
-
- Federal Univ. of West Para (UFOPA), Santarém (Brazil)
- Federal Inst. of Education Science and Technology (IFPA), Belém (Brazil)
- Pennsylvania State Univ., University Park, PA (United States)
- National Inst. for Amazonian Research (INPA), Manaus (Brazil)
- Amazonas State Univ. (UEA), Manaus (Brazil)
- National Inst. for Spatial Research (INPE), Cachoeira Paulista (Brazil)
- Publication Date:
- Research Org.:
- Pennsylvania State Univ., University Park, PA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1611560
- Alternate Identifier(s):
- OSTI ID: 1523670
- Grant/Contract Number:
- SC0011075
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Agricultural and Forest Meteorology
- Additional Journal Information:
- Journal Volume: 260-261; Journal ID: ISSN 0168-1923
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; roughness sublayer; Amazon forest; turbulent profiles; TKE dissipation rate; turbulent regimes
Citation Formats
Santana, Raoni A., Dias-Júnior, Cléo Q., da Silva, Júlio Tóta, Fuentes, Jose D., do Vale, Roseilson Souza, Alves, Eliane Gomes, dos Santos, Rosa Maria N., and Manzi, Antônio O. Air turbulence characteristics at multiple sites in and above the Amazon rainforest canopy. United States: N. p., 2018.
Web. doi:10.1016/j.agrformet.2018.05.027.
Santana, Raoni A., Dias-Júnior, Cléo Q., da Silva, Júlio Tóta, Fuentes, Jose D., do Vale, Roseilson Souza, Alves, Eliane Gomes, dos Santos, Rosa Maria N., & Manzi, Antônio O. Air turbulence characteristics at multiple sites in and above the Amazon rainforest canopy. United States. https://doi.org/10.1016/j.agrformet.2018.05.027
Santana, Raoni A., Dias-Júnior, Cléo Q., da Silva, Júlio Tóta, Fuentes, Jose D., do Vale, Roseilson Souza, Alves, Eliane Gomes, dos Santos, Rosa Maria N., and Manzi, Antônio O. Thu .
"Air turbulence characteristics at multiple sites in and above the Amazon rainforest canopy". United States. https://doi.org/10.1016/j.agrformet.2018.05.027. https://www.osti.gov/servlets/purl/1611560.
@article{osti_1611560,
title = {Air turbulence characteristics at multiple sites in and above the Amazon rainforest canopy},
author = {Santana, Raoni A. and Dias-Júnior, Cléo Q. and da Silva, Júlio Tóta and Fuentes, Jose D. and do Vale, Roseilson Souza and Alves, Eliane Gomes and dos Santos, Rosa Maria N. and Manzi, Antônio O.},
abstractNote = {Atmospheric turbulence characteristics within and above rain forest canopies are investigated at several sites located in the Amazon region of Brazil. Turbulence data provided by bi- and three-dimensional sonic anemometers, which were deployed at heights ranging from near the forest floor to about 80 m, are analyzed to describe the principal features of atmospheric turbulence, sensible heat flux (H), and components of the turbulent kinetic energy (TKE) budget equation. The analyses focused on weak (WW) and strong (SW) wind conditions to achieve the research objectives of evaluating the turbulence structure above and below the rain forest canopy and estimating the degree of coupling between air layers above the forest and deep in the canopy. Turbulence statistical moments show that atmospheric eddies, generated above the canopy, hardly penetrate the region below 0.5h (h is the canopy height). Forest-atmosphere exchanges of heat differ depending on the observed wind regimes. Sensible heat fluxes decrease with canopy depth for SW conditions and are approximately constant with the height for WW above the canopy. Sensible heat flux profiles reveal a transition layer (around 0.6h) which sometimes exchanges heat with the upper and sometimes with the lower forest canopy, depending on time of day and weather conditions. TKE balance results show that during the daytime period in SW conditions the shear production is at least an order of magnitude greater than the buoyancy above the forest canopy. This turbulence, however, is practically all dissipated in the region above 0.5h. Thus, the air layer from the soil surface to 0.5h is largely decoupled from the upper part of the forest canopy. This feature of having the bottom of the canopy mostly decoupled from the air aloft in the dense and tall rain forest can exert control on the residence times and turbulent transport of plant-emitted gases out of the forest canopy.},
doi = {10.1016/j.agrformet.2018.05.027},
journal = {Agricultural and Forest Meteorology},
number = ,
volume = 260-261,
place = {United States},
year = {Thu Jun 07 00:00:00 EDT 2018},
month = {Thu Jun 07 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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