@Article{MallickTBGSDHVKASEDONMHMW:2016:CaBiCo,
author = "Mallick, Kaniska and Trebs, Ivonne and Boegh, Eva and Giustarini,
Laura and Schlerf, Martin and Drewry, Darren T. and Hoffmann,
Lucien and Von Randow, Celso and Kruijt, Bart and Araùjo,
Alessandro and Saleska, Scott and Ehleringer, James R. and
Domingues, Tomas F. and Ometto, Jean Pierre Henry Balbaud and
Nobre, Antonio Donato and Moraes, Osvaldo Luiz Leal de and Hayek,
Matthew and Munger, J. William and Wofsy, Steven C.",
affiliation = "{Luxembourg Institute of Science and Technology (LIST)} and
{Luxembourg Institute of Science and Technology (LIST)} and
{Roskilde University} and {Luxembourg Institute of Science and
Technology (LIST)} and {Luxembourg Institute of Science and
Technology (LIST)} and {Jet Propulsion Laboratory} and {Luxembourg
Institute of Science and Technology (LIST)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Luxembourg Institute
of Science and Technology (LIST)} and {Empresa Brasileira de
Pesquisa Agropecu{\'a}ria (EMBRAPA)} and {University of Arizona}
and {University of Utah} and {Universidade de Sa{\~o} Paulo
(USP)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Centro
Nacional de Monitoramento e Alertas de Desastres Naturais
(CEMADEN)} and {Harvard University} and {Harvard University} and
{Harvard University}",
title = "Canopy-scale biophysical controls of transpiration and evaporation
in the Amazon Basin",
journal = "Hydrology and Earth System Sciences",
year = "2016",
volume = "20",
number = "10",
pages = "4237--4264",
month = "Oct.",
abstract = "Canopy and aerodynamic conductances (gC and gA) are two of the key
land surface biophysical variables that control the land surface
response of land surface schemes in climate models. Their
representation is crucial for predicting transpiration
(\λET) and evaporation (\λEE) flux components of the
terrestrial latent heat flux (\λE), which has important
implications for global climate change and water resource
management. By physical integration of radiometric surface
temperature (TR) into an integrated framework of the
Penman-Monteith and Shuttleworth-Wallace models, we present a
novel approach to directly quantify the canopy-scale biophysical
controls on \λET and \λEE over multiple plant
functional types (PFTs) in the Amazon Basin. Combining data from
six LBA (Large-scale Biosphere-Atmosphere Experiment in Amazonia)
eddy covariance tower sites and a TR-driven physically based
modeling approach, we identified the canopy-scale
feedback-response mechanism between gC, \λET, and
atmospheric vapor pressure deficit (DA), without using any
leaf-scale empirical parameterizations for the modeling. The
TR-based model shows minor biophysical control on \λET
during the wet (rainy) seasons where \λET becomes
predominantly radiation driven and net radiation (RN) determines
75 to 80% of the variances of \λET. However, biophysical
control on \λET is dramatically increased during the dry
seasons, and particularly the 2005 drought year, explaining 50 to
65% of the variances of \λET, and indicates \λET to be
substantially soil moisture driven during the rainfall deficit
phase. Despite substantial differences in gA between forests and
pastures, very similar canopy-atmosphere {"}coupling{"} was found
in these two biomes due to soil moisture-induced decrease in gC in
the pasture. This revealed the pragmatic aspect of the TR-driven
model behavior that exhibits a high sensitivity of gC to per unit
change in wetness as opposed to gA that is marginally sensitive to
surface wetness variability. Our results reveal the occurrence of
a significant hysteresis between \λET and gC during the dry
season for the pasture sites, which is attributed to relatively
low soil water availability as compared to the rainforests, likely
due to differences in rooting depth between the two systems.
Evaporation was significantly influenced by gA for all the PFTs
and across all wetness conditions. Our analytical framework
logically captures the responses of gC and gA to changes in
atmospheric radiation, DA, and surface radiometric temperature,
and thus appears to be promising for the improvement of existing
land-surface-atmosphere exchange parameterizations across a range
of spatial scales.",
doi = "10.5194/hess-20-4237-2016",
url = "http://dx.doi.org/10.5194/hess-20-4237-2016",
issn = "1027-5606",
language = "en",
targetfile = "mallick_canopy.pdf",
urlaccessdate = "27 abr. 2024"
}