Article
Engineering, Civil
Holly A. Roth, Peter D. Blanken
Summary: This study provides direct measurements of evaporation from Standley Lake, revealing its seasonal patterns and the factors influencing it. Summer evaporation is mainly driven by diurnal variations in wind speed and the vapor pressure gradient, while fall and winter are influenced by negative sensible heat transfer. Overall, evaporation plays a significant role in the energy balance of Standley Lake.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Chunjian Sun, Anmin Zhang, Baogang Jin, Xidong Wang, Xiaoshuang Zhang, Lianxin Zhang
Summary: The seasonality of eddy kinetic energy in the north Indian Ocean is analyzed, and the study identifies the regions with significant eddy energy and the factors contributing to its variation.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Agronomy
Stefanie Fischer, Uta Moderow, Ronald Queck, Christian Bernhofer
Summary: The rain interception of a Norway spruce stand was analyzed using canopy water balance measurements and two eddy covariance (EC) related methods. The Rutter model was used to calculate water storage and determine the interception events. The study found that both ETEB and ETEC underestimate the amount of rain interception due to an underestimation of turbulent fluxes.
AGRICULTURAL AND FOREST METEOROLOGY
(2023)
Article
Thermodynamics
Aritra Roy Choudhury, Kameswararao Anupindi
Summary: In this study, a planar turbulent offset wall-jet with heat transfer is numerically investigated using large-eddy simulation (LES). The flow characteristics, thermal characteristics, and turbulent kinetic energy of the jet are analyzed. The evolution of Nusselt number on the wall exhibits three distinct peaks correlated with the change-of-sign of the wall skin-friction coefficient. The flow domain can be categorized into recirculation, impingement, and wall-jet regions, and distinct flow and thermal characteristics are observed in different regions.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Aerospace
Kalyani Bhide, Shaaban Abdallah
Summary: This study characterizes the turbulence in rectangular supersonic jets by directly evaluating various mechanisms in the turbulent kinetic energy (TKE) budget equation. The results show that TKE production is the major source term, while the pressure-dilatation term acts as a sink throughout the development of the jet. The diffusion term has the highest contribution from triple-velocity correlations, followed by pressure diffusion and molecular diffusion.
Article
Forestry
Dexiong Teng, Xuemin He, Lu Qin, Guanghui Lv
Summary: Through 7 years of observations in the Ebinur Lake National Wetland Nature Reserve in Xinjiang, Northwest China, this study reveals that turbulent flux, available energy, and the partitioning of sensible and latent fluxes are influenced by environmental factors, showing significant diurnal and seasonal variations. The energy balance closure varies significantly between growing and dormant seasons, with surface heterogeneity playing a role in these variations.
Article
Meteorology & Atmospheric Sciences
L. Nuijens, A. Savazzi, G. de Boer, P-E Brilouet, G. George, M. Lothon, D. Zhang
Summary: Profiles of eddy momentum flux divergence were studied using airborne instruments, revealing the presence of friction and acceleration under different meteorological conditions. The depth and strength of these phenomena were analyzed.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2022)
Article
Environmental Sciences
R. Ezraty, Z. Mor, R. Bodzin, S. Assouline, J. Tanny, G. Fratini, F. Griessbaum, N. G. Lensky
Summary: This study investigates a new mathematical decontamination method called the Lorentzian filter, which helps eliminate the impact of platform oscillations on wind speed measurements. Results show that the Lorentzian filter effectively removes contamination from wind speed data caused by platform oscillations.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Josh Hashemi, Donatella Zona, Kyle A. Arndt, Aram Kalhori, Walter C. Oechel
Summary: Arctic tundra landscape types exhibit differences in CO2 and CH4 balances and warming potential. Seasonal shifts in carbon emissions help buffer annual carbon budget differences caused by site variability. The polygon site has the largest mean warming potential, followed by the drained lake basin site and the upland site.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Agronomy
Eric R. Beamesderfer, Sebastien C. Biraud, Nathaniel A. Brunsell, Mark A. Friedl, Manuel Helbig, David Y. Hollinger, Thomas Milliman, David A. Rahn, Russell L. Scott, Paul C. Stoy, Jen L. Diehl, Andrew D. Richardson
Summary: The atmospheric mixing layer height (MLH) is a critical variable for understanding ecosystem and climate dynamics. Previous estimation methods have relied on data with low temporal or spatial resolutions. This study used continuous measurements from ceilometers and radiosondes to analyze the surface influence on MLH dynamics. The results highlight the difficulty in explaining MLH dynamics with single-point observations.
AGRICULTURAL AND FOREST METEOROLOGY
(2023)
Article
Environmental Sciences
Xuancheng Lu, Jun Wen, Dongxiao Wang, Wenhui Liu, Yue Yang, Hui Tian, Yueyue Wu, Yuqin Jiang
Summary: In this study, the contribution of horizontal thermal advection to the near-surface energy closure in the alpine wetland of Zoige, China was analyzed using eddy covariance data and WRF modeling data. The results showed that the average horizontal heat advection of the wetland was 20.2 W center dot m(-2), with a maximum value of 55.0 W center dot m(-2) in the summer of 2017. The introduction of thermal advection increased the near-surface energy closure ratio from 72.3% to 81.0%.
Article
Geosciences, Multidisciplinary
Romain Torres, Robin Waldman, Julian Mak, Roland Seferian
Summary: This study uses a simplified model to indirectly estimate the dissipation of eddy kinetic energy (EKE) and finds intensified dissipation near strong ocean currents. The results provide new insights for the global reconstruction of EKE dissipation in the world ocean.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Meteorology & Atmospheric Sciences
Gabriella Luko, Peter Torma, Tamas Weidinger, Tamas Kramer
Summary: Turbulent momentum and heat exchanges at the air-water interface of lakes are complex processes, and this study provides valuable insights into these processes.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Environmental Sciences
Claire K. Yung, Adele K. Morrison, Andrew McC Hogg
Summary: This study reveals the major contribution of topographic hotspots to the eddy upwelling transport in the Southern Ocean. It suggests that improving the simulation of these hotspots in climate models can be achieved by quantifying baroclinic energy conversions. The findings also highlight the importance of localized mechanisms in Southern Ocean dynamics.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Thermodynamics
Osman Salih Yilmaz, Ali Murat Ates, Fatih Gulgen
Summary: This study presents a novel approach for implementing floating photovoltaic (FPV) systems at the Ayvali hydroelectric power plant (HPP) in Turkey. The study accounts for dynamic changes in water levels and accurately calculates shading effects induced by topography. Remote sensing and machine learning algorithms were used to calculate the minimum reservoir surface for the FPV system, and solar analysis was performed to determine the production potential in different areas. The results show that installing FPV in high and very high potential areas can produce 1083.45 GWh of electricity annually, highlighting the importance of considering topography-induced shading and employing RS and GIS techniques.
Article
Meteorology & Atmospheric Sciences
Alexei O. Perelet, Ismail Gultepe, Sebastian W. Hoch, Eric R. Pardyjak
Summary: The study investigates the visibility and discrimination of fog and rain events using a two-wavelength scintillometer system. Results show that near-infrared and microwave radiation are attenuated to similar levels during fog and precipitation events.
BOUNDARY-LAYER METEOROLOGY
(2021)
Article
Meteorology & Atmospheric Sciences
Marco Alves, Daniel F. Nadeau, Biljana Music, Francois Anctil, Simone Fatichi
Summary: This study evaluates the simulation of water balance components at half-hourly time steps using the Canadian Land Surface Scheme (CLASS) driven by a 500-year stochastic meteorological data set. Results show that at the wet site, CLASS driven by stochastic data tends to produce higher evapotranspiration compared to values simulated by ERA5 reanalysis data, especially during spring and summer. On the other hand, at the dry site, both data sets indicate that evapotranspiration and runoff are limited by water availability.
THEORETICAL AND APPLIED CLIMATOLOGY
(2021)
Article
Meteorology & Atmospheric Sciences
Travis Morrison, Eric R. Pardyjak, Matthias Mauder, Marc Calaf
Summary: This study quantifies spatial heterogeneity using data from the Idealized Planar-Array experiment and analyzes the heat-flux imbalance. The results show different biases in the estimation of turbulence flux under different meteorological conditions, and indicate that mean air temperature heterogeneity leads to strong bulk advection and dispersive fluxes.
BOUNDARY-LAYER METEOROLOGY
(2022)
Article
Forestry
Matthew J. Moody, Jeremy A. Gibbs, Steven Krueger, Derek Mallia, Eric R. Pardyjak, Adam K. Kochanski, Brian N. Bailey, Rob Stoll
Summary: QES-Fire is a microscale wildfire model that dynamically couples the fire front to microscale winds, while being computationally efficient. The model represents complex fire fronts using a multiscale plume-merging methodology and shows good agreement with atmospheric large-eddy simulation and field experiment data.
INTERNATIONAL JOURNAL OF WILDLAND FIRE
(2022)
Article
Environmental Sciences
Nipun Gunawardena, Pierre Durand, Thierry Hedde, Florian Dupuy, Eric Pardyjak
Summary: This paper compares two computationally inexpensive methods for predicting and filling spatially varying meteorological variables in complex terrain. The methods, multivariable linear regression and artificial neural networks, are tested on real data to evaluate their performance.
Article
Environmental Sciences
Fabien Margairaz, Hanieh Eshagh, Arash Nemati Hayati, Eric R. Pardyjak, Rob Stoll
Summary: A new wake model for isolated trees is proposed and evaluated in this study. The model shows good accuracy in predicting wind speed and direction, with small deviations in wind speed around isolated trees. Furthermore, the impact of trees and tree wakes on the flow field is highly dependent on the proximity to buildings and building wakes in a complex urban environment.
Article
Meteorology & Atmospheric Sciences
Alexei O. Perelet, Helen C. Ward, Rob Stoll, Walter F. Mahaffee, Eric R. Pardyjak
Summary: Scintillometry is a non-invasive measurement technique used to acquire spatially-averaged surface heat and moisture fluxes. In this study, a two-wavelength scintillometry system was deployed to test an active vineyard, and the results showed that the vineyard was homogeneous at the spatial scales of the scintillometer path.
BOUNDARY-LAYER METEOROLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
Adrien Pierre, Pierre-Erik Isabelle, Daniel F. Nadeau, Antoine Thiboult, Alexei Perelet, Alain N. Rousseau, Francois Anctil, Jaril Deschamps
Summary: This study compares the estimation of turbulent heat fluxes over inland water bodies using scintillometry and eddy-covariance, and finds good correlation for sensible heat fluxes but poor agreement for latent heat fluxes. The larger footprint of the scintillometers may capture greater heterogeneity in the fluxes.
BOUNDARY-LAYER METEOROLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
Marc Calaf, Nikki Vercauteren, Gabriel G. Katul, Marco G. Giometto, Travis J. Morrison, Fabien Margairaz, Vyacheslav Boyko, Eric R. Pardyjak
Summary: The time integration of the unsteady Reynolds-averaged Navier-Stokes equations is widely used in numerical weather prediction. This approach divides the flow into an ensemble mean and turbulence-related fluctuations, allowing closure schemes to describe their statistical properties. However, modelling challenges arise when unresolved fluctuations include non-turbulent structured motions, which can render conventional closure schemes ineffective. This study seeks to address these challenges by discussing theoretical tactics and considering the use of large-eddy simulations, direct numerical simulations, and field measurements.
BOUNDARY-LAYER METEOROLOGY
(2023)
Article
Water Resources
Benjamin Bouchard, Daniel F. Nadeau, Florent Domine
Summary: The boreal forest in the Northern Hemisphere is often snow-covered for more than half of the year. Understanding the relationship between the forest canopy and snow is crucial for hydrological, meteorological, and climate models. However, this is difficult due to variations in forest density. In a study conducted in eastern Canada, researchers found that snowpack microstructure and properties differed between small forest gaps and under the canopy. These differences could have implications for the hydrology of forested areas during snowmelt.
HYDROLOGICAL PROCESSES
(2022)
Article
Biodiversity Conservation
Jennifer D. Watts, Mary Farina, John S. Kimball, Luke D. Schiferl, Zhihua Liu, Kyle A. Arndt, Donatella Zona, Ashley Ballantyne, Eugenie S. Euskirchen, Frans-Jan W. Parmentier, Manuel Helbig, Oliver Sonnentag, Torbern Tagesson, Janne Rinne, Hiroki Ikawa, Masahito Ueyama, Hideki Kobayashi, Torsten Sachs, Daniel F. Nadeau, John Kochendorfer, Marcin Jackowicz-Korczynski, Anna Virkkala, Mika Aurela, Roisin Commane, Brendan Byrne, Leah Birch, Matthew S. Johnson, Nima Madani, Brendan Rogers, Jinyang Du, Arthur Endsley, Kathleen Savage, Ben Poulter, Zhen Zhang, Lori M. Bruhwiler, Charles E. Miller, Scott Goetz, Walter C. Oechel
Summary: Arctic-boreal landscapes are experiencing significant warming, moisture changes, and fire disturbance, which affects the carbon budget in the region. This study provides new estimates of carbon fluxes and methane emissions based on satellite data and model simulations, showing a net carbon sink in the Arctic-boreal zone. However, accounting for additional emissions from aquatic bodies and fire shifts some areas to carbon sources, highlighting the need for integrated assessments to monitor the vulnerability of these ecosystems to climate change.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Meteorology & Atmospheric Sciences
Travis J. Morrison, Marc Calaf, Eric R. Pardyjak
Summary: The closure of the surface energy balance (SEB) has been a long-standing problem for the atmospheric boundary layer (ABL) community. This study compares the results of a three-dimensional SEB approach with the traditional one-dimensional SEB approach using data from the IPAQS 2019 field campaign. The results show that the three-dimensional approach improves the closure of the SEB during convective periods.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2023)
Article
Geography, Physical
Georg Lackner, Florent Domine, Daniel F. Nadeau, Matthieu Lafaysse, Marie Dumont
Summary: The forest-tundra ecotone is a transition zone between the Arctic tundra and the boreal forest, where snow properties vary due to changing vegetation. This study finds significant differences in snow height and density between two sites in this ecotone. The commonly used snow model, Crocus, is unable to accurately simulate the snow in this subarctic setting. The lack of water vapor transport in snow routines used in climate models leads to inadequate representation of snow density profiles, which can have major impacts on meteorological forecasts and climate projections.
Article
Geography, Physical
Georg Lackner, Florent Domine, Daniel F. Nadeau, Annie-Claude Parent, Francois Anctil, Matthieu Lafaysse, Marie Dumont
Summary: Arctic landscapes are covered in snow for at least 6 months a year, and the energy balance of the snow cover plays a key role in influencing various factors. The study aimed to quantify major heat fluxes above, within, and below a low-Arctic snowpack. Results showed that radiative losses are counterbalanced by sensible heat flux, with minimal latent heat flux. The model reproduced the observed energy balance well, but had deficiencies in simulating turbulent heat fluxes at an hourly timescale due to atmospheric stratification effects.
Article
Meteorology & Atmospheric Sciences
Dhiraj K. Singh, Spencer Donovan, Eric R. Pardyjak, Timothy J. Garrett
Summary: DEID is a novel instrument designed for measuring properties of precipitation, including mass, size, density, and type, as well as overall characteristics. It utilizes a thermal approach to measure the spatial dimensions of hydrometeors on a heated metal plate, offering a method for discriminating precipitation phase. The instrument provides accurate measurements of precipitation and shows good agreement with canonical results described in the literature.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2021)
