Results 1 to 10 of about 5,877 (184)

Solid-Phase Reference Baths for Fiber-Optic Distributed Sensing [PDF]

Sensors, 2022
Observations from Raman backscatter-based Fiber-Optic Distributed Sensing (FODS) require reference sections of the fiber-optic cable sensor of known temperature to translate the primary measured intensities of Stokes and anti-Stokes photons to the ...
Christoph K. Thomas, Jannis-Michael Huss, Mohammad Abdoli, Tim Huttarsch, Johann Schneider   +4 more
doaj   +2 more sources

Bioeconomy and Climate Change: The Scenarios of Food Insecurity in Brazil’s Northern Region (Amazon) Due to the Shift from Traditional Table Crops to Globally Valued Commodities [PDF]

Foods
Climate variability directly influences agriculture, especially in a scenario of global change and transition to a sustainable bioeconomy. This study analyzed historical series (1994–2023) of productivity and harvested area of annual crops (corn, cassava,
Waldeir Pereira, Tulio Lara, Antônio Andrade, Marcos Seruffo, Aurilene Andrade, Cláudio Silva, Bergson Bezerra, Keila Mendes, Iolanda Reis, Iracenir Santos, Larice Marinho, Hildo Nunes, Juliane Barros, Matheus Lima, Lucas Silva, Roberto Monteiro, José Santos, Theomar Neves, Raoni Santana, Lucas Vaz Peres, Alex Silva, Petia Oliveira, Aldeize Tribuzy, Eliandra Sia, Daniela Pauletto, Celeste Rossi, André Silva, Francisco Silva, Letícia Moreira, Pio Lima-Netto, Celson Lima, Gabriel Brito-Costa   +31 more
doaj   +2 more sources

Net ecosystem CO₂ exchange measurements by the closed chamber method and the eddy covariance technique and their dependence on atmospheric conditions [PDF]

Atmospheric Measurement Techniques, 2014
Carbon dioxide flux measurements in ecosystem sciences are mostly conducted by eddy covariance technique or the closed chamber method. But there is a lack of detailed comparisons that assess present differences and uncertainties.
M. Riederer, A. Serafimovich, T. Foken
doaj   +4 more sources

Parameterization of Evapotranspiration Estimation for Two Typical East Asian Crops [PDF]

Atmosphere, 2017
Estimation of evapotranspiration plays an important role in understanding the water cycle on the earth, especially the water budget in agricultural ecosystems. The parameterization approach of the Penman-Monteith-Katerji-Perrier (PM-KP) model, accounting
Peng Zhao, Johannes Lüers
doaj   +4 more sources

Calyx and Corolla as Heliocaminiform Structures Enhance the Reproductive Adaptation of Brandisia hancei (Orobanchaceae) to Low Winter Temperatures [PDF]

Ecology and Evolution
The thermoregulation of plants through the heliocaminiform effect of hollow structures is widespread but overlooked. Winter‐flowering plants in subtropical regions often suffer from low temperatures; however, the reproductive adaptations of these plants ...
Yongquan Ren, Ruifeng Sun, Yu He, Xia Jiang, Weilai Chen, Hongyun Xu, Yanyan He, Xiaoling Tian   +7 more
doaj   +2 more sources

Forward-Looking Infrared Cameras for Micrometeorological Applications within Vineyards [PDF]

Sensors, 2016
We apply the principles of atmospheric surface layer dynamics within a vineyard canopy to demonstrate the use of forward-looking infrared cameras measuring surface brightness temperature (spectrum bandwidth of 7.5 to 14 μm) at a relatively high temporal ...
Marwan Katurji, Peyman Zawar-Reza
doaj   +2 more sources

Toward quantifying turbulent vertical airflow and sensible heat flux in tall forest canopies using fiber-optic distributed temperature sensing [PDF]

Atmospheric Measurement Techniques, 2023
The paper presents a set of fiber-optic distributed temperature sensing (FODS) experiments to expand the existing microstructure approach for horizontal turbulent wind direction by adding measurements of turbulent vertical component, as well as turbulent
M. Abdoli, K. Lapo, K. Lapo, J. Schneider, J. Olesch, C. K. Thomas, C. K. Thomas   +6 more
doaj   +1 more source

The Large eddy Observatory, Voitsumra Experiment 2019 (LOVE19) with high-resolution, spatially distributed observations of air temperature, wind speed, and wind direction from fiber-optic distributed sensing, towers, and ground-based remote sensing [PDF]

Earth System Science Data, 2022
The weak-wind stable boundary layer (wwSBL) is poorly described by theory and breaks basic assumptions necessary for observations of turbulence. Understanding the wwSBL requires distributed observations capable of separating between sub-mesoscales and ...
K. Lapo, K. Lapo, A. Freundorfer, A. Fritz, A. Fritz, J. Schneider, J. Olesch, W. Babel, W. Babel, C. K. Thomas, C. K. Thomas   +10 more
doaj   +1 more source

The NY-Ålesund TurbulencE Fiber Optic eXperiment (NYTEFOX): investigating the Arctic boundary layer, Svalbard [PDF]

Earth System Science Data, 2021
The NY-Ålesund TurbulencE Fiber Optic eXperiment (NYTEFOX) was a field experiment at the Ny-Ålesund Arctic site (78.9∘ N, 11.9∘ E) and yielded a unique meteorological data set.
M.-L. Zeller, J.-M. Huss, L. Pfister, L. Pfister, K. E. Lapo, K. E. Lapo, D. Littmann, J. Schneider, A. Schulz, C. K. Thomas, C. K. Thomas   +10 more
doaj   +1 more source

Distributed observations of wind direction using microstructures attached to actively heated fiber-optic cables [PDF]

Atmospheric Measurement Techniques, 2020
The weak-wind boundary layer is characterized by turbulent and submesoscale motions that break the assumptions necessary for using traditional eddy covariance observations such as horizontal homogeneity and stationarity, motivating the need for an ...
K. Lapo, K. Lapo, A. Freundorfer, L. Pfister, J. Schneider, J. Selker, C. Thomas, C. Thomas   +7 more
doaj   +1 more source