Direct partitioning of eddy-covariance water and carbon dioxide fluxes into ground and plant components

E Zahn, E Bou-Zeid, SP Good, GG Katul… - Agricultural and Forest …, 2022 - Elsevier
The partitioning of evapotranspiration (ET) into surface evaporation (E) and stomatal-based
transpiration (T) is essential for analyzing the water cycle and earth surface energy budget …

Relaxed eddy accumulation outperforms Monin‐Obukhov flux models under non‐ideal conditions

E Zahn, E Bou‐Zeid, NL Dias - Geophysical Research Letters, 2023 - Wiley Online Library
Abstract The Monin‐Obukhov Similarity Theory (MOST) links turbulent statistics to surface
fluxes through universal functions. Here, we investigate its performance over a large lake …

Turbulence regimes in the nocturnal roughness sublayer: Interaction with deep convection and tree mortality in the Amazon

ACS Mendonça, CQ Dias-Júnior, OC Acevedo… - Agricultural and Forest …, 2023 - Elsevier
We investigated the influence of seasonality and proximity to the forest canopy on nocturnal
turbulence regimes in the roughness sublayer of a Central Amazon forest. Since convective …

Flux-variance and flux-gradient relationships in the roughness sublayer over the Amazon forest

TL Chor, NL Dias, A Araújo, S Wolff, E Zahn… - Agricultural and Forest …, 2017 - Elsevier
The failure of the Monin–Obukhov Similarity Theory (MOST) in the roughness sublayer is a
major problem for the estimation of fluxes over tall forests, whenever indirect methods that …

An analog period method for gap‐filling of latent heat flux measurements

LEB Hoeltgebaum, NL Dias… - Hydrological Processes, 2021 - Wiley Online Library
Practically all records of eddy‐covariance flux measurements are affected by gaps, caused
by several reasons. In this work, we propose analog period (AP) methods for gap‐filling, and …

The Relaxed Eddy Accumulation Method Over the Amazon Forest: The Importance of Flux Strength on Individual and Aggregated Flux Estimates

NL Dias, IMC Toro, CQ Dias-Júnior, L Mortarini… - Boundary-Layer …, 2023 - Springer
The ability of the relaxed eddy accumulation (REA) method to estimate the kinematic fluxes
of temperature, water vapor and carbon dioxide was assessed for the dry season (3 months) …

Effects of path averaging in a sonic anemometer on the estimation of turbulence-kinetic-energy dissipation rates

LS Freire, NL Dias, M Chamecki - Boundary-Layer Meteorology, 2019 - Springer
The turbulence-kinetic-energy dissipation rate is a fundamental property in turbulent flows,
but its direct measurement in the atmospheric surface layer is still a challenge. Indirect …

The Hurst phenomenon in error estimates related to atmospheric turbulence

NL Dias, BL Crivellaro, M Chamecki - Boundary-Layer Meteorology, 2018 - Springer
The Hurst phenomenon is a well-known feature of long-range persistence first observed in
hydrological and geophysical time series by E. Hurst in the 1950s. It has also been found in …

Towards better representation of water, CO2, and temperature exchanges at the land-atmosphere interface

E Zahn - 2023 - search.proquest.com
The movement of water between the surface and the atmosphere is often linked to
exchanges of other quantities such as CO 2 and temperature. Therefore, understanding how …

Regimes de turbulência na camada limite noturna acima da floresta Amazônica

ACS de Mendonça, CQD Júnior, OC Acevedo… - Ciência e …, 2023 - periodicos.ufsm.br
We identify two nocturnal turbulence regimes at different heights above the Amazon Forest
and their variation in relation to the proximity of the forest canopy. We analyzed fast …