@Article{SantanaDSFVASM:2018:AiTuCh,
author = "Santana, Raoni A. and Dias J{\'u}nior, Cl{\'e}o Q. and Silva,
J{\'u}lio T{\'o}ta da and Fuentes, Jose D. and Vale, Roseilon
Souza do and Alves, Eliane Gomes and Santos, Rosa Maria N. dos and
Manzi, Antonio Ocimar",
affiliation = "{Universidade Federal do Oeste do Par{\'a} (UFOPA)} and Instituto
Federal de Educa{\c{c}}{\~a}o, Ci{\^e}ncia e Tecnologia and
{Universidade Federal do Oeste do Par{\'a} (UFOPA)} and
{Pennsylvania State University} and {Universidade Federal do Oeste
do Par{\'a} (UFOPA)} and {Instituto Nacional de Pesquisas da
Amaz{\^o}nia (INPA)} and {Universidade do Estado do Amazonas
(UEA)} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Air turbulence characteristics at multiple sites in and above the
Amazon rainforest canopy",
journal = "Agricultural and Forest Meteorology",
year = "2018",
volume = "260/261",
pages = "41--54",
month = "Oct.",
keywords = "Roughness sublayer, Amazon forest, Turbulent profiles, TKE
dissipation rate, Turbulent regimes.",
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 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",
url = "http://dx.doi.org/10.1016/j.agrformet.2018.05.027",
issn = "0168-1923",
language = "en",
targetfile = "santana_air.pdf",
urlaccessdate = "20 abr. 2024"
}