@Article{ChorDAWZMTSTS:2017:FlFlRe,
author = "Chor, Thomas L. and Dias, Nelson L. and Ara{\'u}jo, Alessandro
and Wolff, Stefan and Zahn, Einara and Manzi, Ant{\^o}nio Ocimar
and Trebs, Ivonne and S{\'a}, Marta O. and Teixeira, Paulo R. and
S{\"o}rgel, Matthias",
affiliation = "{Universidade Federal do Paran{\'a} (UFPR)} and {Universidade
Federal do Paran{\'a} (UFPR)} and {Empresa Brasileira de Pesquisa
Agropecu{\'a}ria (EMBRAPA)} and {Max Planck Institute for
Chemistry} and {Universidade Federal do Paran{\'a} (UFPR)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Environmental Research and Innovation (ERIN)} and {Instituto
Nacional de Pesquisas da Amaz{\^o}nia (INPA)} and {Instituto
Nacional de Pesquisas da Amaz{\^o}nia (INPA)} and {Max Planck
Institute for Chemistry}",
title = "Flux-variance and flux-gradient relationships in the roughness
sublayer over the Amazon forest",
journal = "Agricultural and Forest Meteorology",
year = "2017",
volume = "239",
pages = "213--222",
month = "May",
keywords = "ATTO project, Flux-gradient relationships, Roughness sublayer,
Scalar similarity.",
abstract = "The failure of the MoninObukhov Similarity Theory (MOST) in the
roughness sublayer is a major problem for the estimation of fluxes
over tall forests, whenever indirect methods that rely on MOST,
such as flux-gradient or the variance method, are involved. While
much research focuses on micrometeorological measurements over
temperate-climate forests, very few studies deal with such
measurements over tropical forests. In this paper, we show
evidence that some similarity functions over the Amazon forest are
somewhat different from temperate forests. Comparison of the
nondimensional scalar gradients canonical values for the inertial
sublayer with our measurements in the roughness sublayer showed
smaller deviations than what is usually reported for temperate
forests. Although the fluxes of water vapor and CO2 derived from
mean profiles show considerable scatter when compared with the
eddy covariance measurements, using calibrated dimensionless
gradients it is possible to estimate their mean daily cycle during
the period of measurement (36 days in May and June, transition
between rainy and dry season). Moreover, since mean ozone profiles
were available, although without the corresponding eddy covariance
measurements, mean daily ozone fluxes were calculated with the
flux-gradient method, yielding a nighttime value of \−0.05
and a daily peak of \−0.45 \μg m\−2
s\−1 (\−1.04 and \−9.37 nmol m\−2
s\−1, respectively). These values are comparable to
previously measured fluxes in the literature for the Amazon
forest.",
doi = "10.1016/j.agrformet.2017.03.009",
url = "http://dx.doi.org/10.1016/j.agrformet.2017.03.009",
issn = "0168-1923",
language = "en",
targetfile = "chor_flux.pdf",
urlaccessdate = "27 abr. 2024"
}