@Article{GerkenRFABMMMSVS:2018:InMeRe,
author = "Gerken, Tobias and Ruddell, Benjamin L. and Fuentes, Jose D. and
Ara{\'u}jo, Alessandro and Brunsell, Nathaniel A. and Maia, Jair
and Manzi, Antonio and Mercer, Juliane and Santos, Rosa Nascimento
dos and Von Randow, Celso and Stoy, Paul C.",
affiliation = "{Montana State University} and {Northern Arizona University} and
{The Pennsylvania State University} and {Embrapa Amaz{\^o}nia
Oriental} and {University of Kansas} and {Universidade do Estado
do Amazonas (UEA)} and {Instituto Nacional de Pesquisas da
Amaz{\^o}nia (INPA)} and {Montana State University} and
{Universidade do Estado do Amazonas (UEA)} and {Instituto Nacional
de Pesquisas Espaciais (INPE)} and {Montana State University}",
title = "Investigating the mechanisms responsible for the lack of surface
energy balance closure in a central Amazonian tropical
rainforest",
journal = "Agricultural and Forest Meteorology",
year = "2018",
volume = "255",
pages = "92--103",
month = "May",
keywords = "Eddy covariance, Information flow, Latent heat flux, Sensible heat
flux, Tropical rainforest.",
abstract = "This work investigates the diurnal and seasonal behavior of the
energy balance residual (E) that results from the observed
difference between available energy and the turbulent fluxes of
sensible heat (H) and latent heat (LE) at the FLUXNET BR-Ma2 site
located in the Brazilian central Amazon rainforest. The behavior
of E is analyzed by extending the eddy covariance averaging length
from 30 min to 4 h and by applying an Information Flow Dynamical
Process Network to diagnose processes and conditions affecting E
across different seasons. Results show that the seasonal turbulent
flux dynamics and the Bowen ratio are primarily driven by net
radiation (Rn), with substantial sub-seasonal variability. The
Bowen ratio increased from 0.25 in April to 0.4 at the end of
September. Extension of the averaging length from 0.5 (94.6%
closure) to 4 h and thus inclusion of longer timescale eddies and
mesoscale processes closes the energy balance and lead to an
increase in the Bowen ratio, thus highlighting the importance of
additional H to E. Information flow analysis reveals that the
components of the energy balance explain between 25 and 40% of the
total Shannon entropy with higher values during the wet season
than the dry season. Dry season information flow from the buoyancy
flux to E are 3050% larger than that from H, indicating the
potential importance of buoyancy fluxes to closing E. While the
low closure highlights additional sources not captured in the flux
data and random measurement errors contributing to E, the findings
of the information flow and averaging length analysis are
consistent with the impact of mesoscale circulations, which tend
to transport more H than LE, on the lack of closure.",
doi = "10.1016/j.agrformet.2017.03.023",
url = "http://dx.doi.org/10.1016/j.agrformet.2017.03.023",
issn = "0168-1923",
language = "en",
targetfile = "gerken_investigating.pdf",
urlaccessdate = "27 abr. 2024"
}