Article
Acoustics
Janos Fekete, Peter Torma, Anna Szabo, Miklos Balogh, Csaba Horvath, Tamas Weidinger, Gabor Szab, Zoltan Bozoki
Summary: High temporal resolution concentration measurements in rapid gas flows are difficult due to excessive aero-acoustic noise. However, the fully open photoacoustic cell (OC) has proven to be viable even at high gas velocities. The OC is a modified version of a previously introduced OC based on a combined acoustic mode. Its noise characteristics and analytical performance were tested under controlled conditions and field testing. This study presents the successful application of a sampling-free OC for water vapor flux measurements.
Article
Geosciences, Multidisciplinary
Michael P. Vermeuel, Patricia A. Cleary, Ankur R. Desai, Timothy H. Bertram
Summary: The study reveals a significant contribution of nonstomatal pathways in canopy to the dry deposition of O-3, which is not correctly captured in current models. Stomatal uptake and estimated absorption only explain a small portion of O-3 loss.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Yurong Feng, Shuai Xu, Zhi-Ling Song, Tian-Bing Ren, Shuang-Yan Huan, Lin Yuan, Xiao-Bing Zhang
Summary: In this study, we introduced an activatable chemiluminescent probe CL-O-3 for high-contrast imaging of O(3) in vivo. CL-O-3 demonstrated excellent selectivity towards O-3 and could evaluate the degree of inflammation by detecting endogenous O-3 levels in acute inflamed mice.
CHEMICAL COMMUNICATIONS
(2022)
Article
Water Resources
Lucas Emilio B. Hoeltgebaum, Nelson Luis Dias, Marcelo Azevedo Costa
Summary: Practically all records of eddy-covariance flux measurements are affected by gaps, and this study proposes analog period methods for gap-filling, which outperform mean diurnal variation method and simple/multiple linear regression techniques. The proposed methods also perform better than REddyProc and evaporative fraction method for filling missing data.
HYDROLOGICAL PROCESSES
(2021)
Article
Engineering, Civil
Shouzheng Jiang, Chuan Liang, Lu Zhao, Daozhi Gong, Yaowei Huang, Liwen Xing, Shidan Zhu, Yu Feng, Li Guo, Ningbo Cui
Summary: Understanding and quantifying energy and water flux cycling is crucial for studying hydrological processes and managing water resources in agricultural ecosystems. This study used various techniques and models to examine energy and water flux in a kiwifruit orchard in southwest China. The results showed that latent heat flux dominated the consumption of net radiation energy, and the ET models performed well in estimating ET and its components. These findings have important implications for eco-hydrological process analysis and water flux estimation in similar environmental conditions.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Zan Liu, Yuepeng Pan, Tao Song, Bo Hu, Lili Wang, Yuesi Wang
Summary: This study presented the first eddy covariance measurements of ozone flux at different heights in a Chinese forest, revealing that ozone flux and deposition velocity were higher above the canopy compared to below, with stomatal uptake playing an important role in ozone deposition. Ozone deposition velocity increased with air temperature, relative humidity, photosynthetically active radiation, and friction velocity, but tended to plateau when these meteorological factors exceeded their optimal values.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Agronomy
Anne Klosterhalfen, Jinshu Chi, Natascha Kljun, Anders Lindroth, Hjalmar Laudon, Mats B. Nilsson, Matthias Peichl
Summary: The assumption of homogeneous flux footprint area in land-atmosphere exchanges based on the eddy covariance technique is not valid because of the heterogeneity in the source area. A two-level approach combining measurements at different heights can reduce the impact of source area heterogeneity on flux estimates and improve their accuracy.
AGRICULTURAL AND FOREST METEOROLOGY
(2023)
Article
Engineering, Civil
Xinwei Liu, Wei Zhan, Dan Zhu, Ning Wu, Yixin He, Huai Chen
Summary: This study used an eddy covariance tower to measure water vapor flux in wetland area of the Qinghai-Tibetan Plateau in China. The results showed that water vapor flux in wetlands has a long-term impact on both micro-meteorological environment and net CO2 ecosystem exchange (NEE).
JOURNAL OF HYDROLOGY
(2022)
Article
Agronomy
Kelley Drechsler, Allan Fulton, Isaya Kisekka
Summary: This study conducted in California determined crop water use and crop coefficients for young almond orchards. The results showed that water use and coefficients increased until the 4th year, highlighting the importance of considering tree development and orchard age in irrigation scheduling.
IRRIGATION SCIENCE
(2022)
Article
Environmental Sciences
Jennifer V. Mecking, Sybren S. Drijfhout
Summary: Using climate projections, this study finds that future ocean heat transport is expected to decrease, primarily driven by a decline in overturning circulation, which will affect the global warming signal in Northwest Europe.
NATURE CLIMATE CHANGE
(2023)
Article
Computer Science, Artificial Intelligence
Lukasz Karbowiak, Janusz Bobulski
Summary: This article introduces the importance of background segmentation and proposes a method to compare algorithms under severe weather conditions. Through testing in different weather conditions, interesting differences in detail detection and detection noise were observed.
PEERJ COMPUTER SCIENCE
(2022)
Article
Agronomy
Jose Darlon Nascimento Alves, Aristides Ribeiro, Yhasmin Paiva Rody, Rodolfo Araujo Loos
Summary: This study evaluated the energy fluxes and decoupling factor in pasture lands in the Brazilian Cerrado. The results showed that latent heat flux predominated during the wet season, while the ratio of latent heat flux to net radiation decreased during the dry season. The study also found that pasture lands were highly coupled to the atmosphere during the dry season, and the observed surface decoupling factor was lower in 2017-2018 due to the control of stomatal conductance during the unexpected drought.
AGRICULTURAL AND FOREST METEOROLOGY
(2022)
Article
Environmental Sciences
Janine Lueckerath, Andreas Held, Holger Siebert, Michel Michalkow, Birgit Wehner
Summary: Aerosol particles play important roles in radiation effects, cloud formation, and the climate system. This study estimated the vertical aerosol particle flux in the marine boundary layer (MBL) and the vertical exchange between the MBL and the free troposphere (FT) using three different methods. The results contribute to a better understanding of particle transport between the MBL and FT, as well as their distribution in the MBL.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Kai Wu, Kenneth J. Davis, Natasha L. Miles, Scott J. Richardson, Thomas Lauvaux, Daniel P. Sarmiento, Nikolay Balashov, Klaus Keller, Jocelyn Turnbull, Kevin R. Gurney, Jianming Liang, Geoffrey Roest
Summary: This study compares source-partitioned CO2 flux measurements with a high-resolution urban CO2 emissions inventory. The results show that the emissions from the Hestia inventory exceed the eddy-covariance measured emissions in both the cold and warm seasons. The daily cycle and spatial structure of the two methods are closely matched, but a persistent spatial pattern suggests a bias related to residential heating emissions. Additionally, the biological uptake and respiration in the winter contradict common assumptions about the lack of significant biological CO2 exchange in northern cities.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
S. Dupont, J. L. Rajot, E. Lamaud, G. Bergametti, M. Labiadh, B. Khalfallah, C. Bouet, B. Marticorena, R. Fernandes
Summary: For the first time, the study compared the differences in estimating size-resolved dust fluxes using the flux-gradient method and the eddy-covariance method, finding that both methods predict similar dust fluxes for particles smaller than 4 micrometers, but the eddy-covariance method predicts a smaller dust flux for coarse particles compared to the flux-gradient method.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
