Articles | Volume 7, issue 2
https://doi.org/10.5194/gi-7-151-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gi-7-151-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
07 Jun 2018
Research article |
| 07 Jun 2018
| 07 Jun 2018
Evaluating four gap-filling methods for eddy covariance measurements of evapotranspiration over hilly crop fields
Nissaf Boudhina
LISAH, IRD, INRA, Montpellier SupAgro, University of Montpellier, 34060 Montpellier, France
Institut National Agronomique de Tunisie (INAT)/Carthage University, Tunis, Tunisia
Institut National de Recherche en Génie Rural, Eaux et Forêts (INRGREF)/Carthage University, Ariana, Tunisia
Insaf Mekki
Institut National de Recherche en Génie Rural, Eaux et Forêts (INRGREF)/Carthage University, Ariana, Tunisia
Frédéric Jacob
LISAH, IRD, INRA, Montpellier SupAgro, University of Montpellier, 34060 Montpellier, France
Institut National de Recherche en Génie Rural, Eaux et Forêts (INRGREF)/Carthage University, Ariana, Tunisia
Nétij Ben Mechlia
Institut National Agronomique de Tunisie (INAT)/Carthage University, Tunis, Tunisia
Moncef Masmoudi
Institut National Agronomique de Tunisie (INAT)/Carthage University, Tunis, Tunisia
Laurent Prévot
Institut National de Recherche en Génie Rural, Eaux et Forêts (INRGREF)/Carthage University, Ariana, Tunisia
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Maxim Philippov, Vladimir Makhmutov, Galina Bazilevskaya, Fedor Zagumennov, Vladimir Fomenko, Yuri Stozhkov, and Andrey Orlov
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Geosci. Instrum. Method. Data Syst., 10, 161–168, https://doi.org/10.5194/gi-10-161-2021, https://doi.org/10.5194/gi-10-161-2021, 2021
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Keyu Zhou, Qisheng Zhang, Yongdong Liu, Zhen Wu, Zucan Lin, Bentian Zhao, Xingyuan Jiang, and Pengyu Li
Geosci. Instrum. Method. Data Syst., 10, 141–151, https://doi.org/10.5194/gi-10-141-2021, https://doi.org/10.5194/gi-10-141-2021, 2021
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Qimao Zhang, Shuaiqing Qiao, Qisheng Zhang, and Shiyang Liu
Geosci. Instrum. Method. Data Syst., 10, 91–100, https://doi.org/10.5194/gi-10-91-2021, https://doi.org/10.5194/gi-10-91-2021, 2021
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Anne-Karin Cooke, Cédric Champollion, and Nicolas Le Moigne
Geosci. Instrum. Method. Data Syst., 10, 65–79, https://doi.org/10.5194/gi-10-65-2021, https://doi.org/10.5194/gi-10-65-2021, 2021
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Sixuan Song, Ming Deng, Kai Chen, Muer A, and Sheng Jin
Geosci. Instrum. Method. Data Syst., 10, 55–64, https://doi.org/10.5194/gi-10-55-2021, https://doi.org/10.5194/gi-10-55-2021, 2021
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Ramiro González, Carlos Toledano, Roberto Román, David Fuertes, Alberto Berjón, David Mateos, Carmen Guirado-Fuentes, Cristian Velasco-Merino, Juan Carlos Antuña-Sánchez, Abel Calle, Victoria E. Cachorro, and Ángel M. de Frutos
Geosci. Instrum. Method. Data Syst., 9, 417–433, https://doi.org/10.5194/gi-9-417-2020, https://doi.org/10.5194/gi-9-417-2020, 2020
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Ozkan Kafadar
Geosci. Instrum. Method. Data Syst., 9, 365–373, https://doi.org/10.5194/gi-9-365-2020, https://doi.org/10.5194/gi-9-365-2020, 2020
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Maximilian Weigand, Florian M. Wagner, Jonas K. Limbrock, Christin Hilbich, Christian Hauck, and Andreas Kemna
Geosci. Instrum. Method. Data Syst., 9, 317–336, https://doi.org/10.5194/gi-9-317-2020, https://doi.org/10.5194/gi-9-317-2020, 2020
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Angelika Xaver, Luca Zappa, Gerhard Rab, Isabella Pfeil, Mariette Vreugdenhil, Drew Hemment, and Wouter Arnoud Dorigo
Geosci. Instrum. Method. Data Syst., 9, 117–139, https://doi.org/10.5194/gi-9-117-2020, https://doi.org/10.5194/gi-9-117-2020, 2020
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Soil moisture plays a key role in the hydrological cycle and the climate system. Although soil moisture can be observed by the means of satellites, ground observations are still crucial for evaluating and improving these satellite products. In this study, we investigate the performance of a consumer low-cost soil moisture sensor in the lab and in the field. We demonstrate that this sensor can be used for scientific applications, for example to create a dataset valuable for satellite validation.
Qisheng Zhang, Wenhao Li, Feng Guo, Zhenzhong Yuan, Shuaiqing Qiao, and Qimao Zhang
Geosci. Instrum. Method. Data Syst., 8, 241–249, https://doi.org/10.5194/gi-8-241-2019, https://doi.org/10.5194/gi-8-241-2019, 2019
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Complex and harsh exploration environments have put forward higher requirements for traditional geophysical exploration methods and instruments. In this study, a new distributed seismic and electrical hybrid acquisition station is developed and it can achieve high-precision hybrid acquisition of seismic and electrical data. The synchronization precision of the acquisition station is better than 200 ns and the maximum low-power data transmission speed is 16 Mbps along a 55 m cable.
Wenhao Li, Qisheng Zhang, Qimao Zhang, Feng Guo, Shuaiqing Qiao, Shiyang Liu, Yueyun Luo, Yuefeng Niu, and Xing Heng
Geosci. Instrum. Method. Data Syst., 8, 177–186, https://doi.org/10.5194/gi-8-177-2019, https://doi.org/10.5194/gi-8-177-2019, 2019
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The nonuniqueness of geophysical inversions, which is based on a single geophysical method, is a long–standing problem in geophysical exploration. This paper developed a distributed, multi–channel, high–precision data acquisition system. It can achieve high–precision hybrid acquisition of seismic–electrical data and monitor the real–time quality of data acquisition processes using NB–IoT technology. The equivalent input noise is 0.5 μV and the synchronization accuracy is within 200 ns.
Andrew O. Hoffman, Hans Christian Steen-Larsen, Knut Christianson, and Christine Hvidberg
Geosci. Instrum. Method. Data Syst., 8, 149–159, https://doi.org/10.5194/gi-8-149-2019, https://doi.org/10.5194/gi-8-149-2019, 2019
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We present the design considerations and deployment of an autonomous modular terrestrial rover for ice-sheet exploration that is inexpensive, easy to construct, and allows for instrumentation customization. The rover proved capable of driving over 20 km on a single charge with a drawbar pull of 250 N, which is sufficient to tow commercial ground-penetrating radars. Due to its low cost, low power requirements, and simple modular design, mass deployments of this rover design are practicable.
Sharafeldin M. Sharafeldin, Khalid S. Essa, Mohamed A. S. Youssef, Hakan Karsli, Zein E. Diab, and Nilgun Sayil
Geosci. Instrum. Method. Data Syst., 8, 29–43, https://doi.org/10.5194/gi-8-29-2019, https://doi.org/10.5194/gi-8-29-2019, 2019
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Lichao Liu, Denys Grombacher, Esben Auken, and Jakob Juul Larsen
Geosci. Instrum. Method. Data Syst., 8, 1–11, https://doi.org/10.5194/gi-8-1-2019, https://doi.org/10.5194/gi-8-1-2019, 2019
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This paper introcudes the design workflow and test approaches of a surface-NMR receiver. But the method and technqiues, for instance, signal loop, acqusition board, GPS synchronization, and Wi-Fi network, could also be employed in other geophysical instruments.
Shuaiqing Qiao, Hongmei Duan, Qisheng Zhang, Qimao Zhang, Shuhan Li, Shenghui Liu, Shiyang Liu, Yongqing Wang, Shichu Yan, Wenhao Li, and Feng Guo
Geosci. Instrum. Method. Data Syst., 7, 253–263, https://doi.org/10.5194/gi-7-253-2018, https://doi.org/10.5194/gi-7-253-2018, 2018
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In this study, a high-precision distributed wireless microseismic acquisition system has been designed for oil and gas exploration. The system design, which was based on the ADS1274 chip manufactured by TI, made full use of the four channels of the chip to collect vibration signals in three directions and one electrical signal, respectively. Furthermore, the acquisition system used GPS and WIFI technologies to achieve distributed wireless acquisition.
Kazuyuki Saito, Go Iwahana, Hiroki Ikawa, Hirohiko Nagano, and Robert C. Busey
Geosci. Instrum. Method. Data Syst., 7, 223–234, https://doi.org/10.5194/gi-7-223-2018, https://doi.org/10.5194/gi-7-223-2018, 2018
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A DTS system, using fibre-optic cables as a temperature sensor, measured surface and subsurface temperatures at a boreal forest underlain by permafrost in the interior of Alaska for 2 years every 30 min at 0.5-metre intervals along 2.7 km to monitor the daily and seasonal temperature changes, whose temperature ranges between −40 ºC in winter and 30 ºC in summer. This instrumentation illustrated characteristics of temperature variations and snow pack dynamics under different land cover types.
Fanqiang Lin, Xuben Wang, Kecheng Chen, Depan Hu, Song Gao, Xue Zou, and Cai Zeng
Geosci. Instrum. Method. Data Syst., 7, 209–221, https://doi.org/10.5194/gi-7-209-2018, https://doi.org/10.5194/gi-7-209-2018, 2018
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The main purpose of this paper is to introduce a receiver system for the synchronous acquisition of multiple electromagnetic signals in transient electromagnetic prospecting to achieve multiparameter and multichannel synchronous reception. The reliability, practicability, and data validity of the receiver were verified by different kinds of testing. It can be used for the reception of pseudorandom signals and distributed 3-D data, which can improve geophysical exploration efficiency.
Prasanna Mahavarkar, Jacob John, Vijay Dhapre, Varun Dongre, and Sachin Labde
Geosci. Instrum. Method. Data Syst., 7, 143–149, https://doi.org/10.5194/gi-7-143-2018, https://doi.org/10.5194/gi-7-143-2018, 2018
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The authors have successfully recommissioned an unused tri-axial Helmholtz coil system. The system now serves as a national facility for calibrating magnetometers.
Martin Schrön, Steffen Zacharias, Gary Womack, Markus Köhli, Darin Desilets, Sascha E. Oswald, Jan Bumberger, Hannes Mollenhauer, Simon Kögler, Paul Remmler, Mandy Kasner, Astrid Denk, and Peter Dietrich
Geosci. Instrum. Method. Data Syst., 7, 83–99, https://doi.org/10.5194/gi-7-83-2018, https://doi.org/10.5194/gi-7-83-2018, 2018
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Cosmic-ray neutron sensing (CRNS) is a unique technology to monitor water storages in complex environments, non-invasively, continuously, autonomuously, and representatively in large areas. However, neutron detector signals are not comparable per se: there is statistical noise, technical differences, and locational effects. We found out what it takes to make CRNS consistent in time and space to ensure reliable data quality. We further propose a method to correct for sealed areas in the footrint.
Xinyue Zhang, Qisheng Zhang, Meng Wang, Qiang Kong, Shengquan Zhang, Ruihao He, Shenghui Liu, Shuhan Li, and Zhenzhong Yuan
Geosci. Instrum. Method. Data Syst., 6, 495–503, https://doi.org/10.5194/gi-6-495-2017, https://doi.org/10.5194/gi-6-495-2017, 2017
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We believe that our study full-waveform voltage and current recording device for MTEM transmitters makes a significant contribution to the literature because this full-waveform recording device can be used to monitor the high-power, full-waveform voltages and currents of MTEM transmitters. It has high precision, finer edge details, low noise, and other advantages. Hence, it can be used for real-time recording and transmission to the receiver for coherent demodulation.
Peter W. Thorne, Fabio Madonna, Joerg Schulz, Tim Oakley, Bruce Ingleby, Marco Rosoldi, Emanuele Tramutola, Antti Arola, Matthias Buschmann, Anna C. Mikalsen, Richard Davy, Corinne Voces, Karin Kreher, Martine De Maziere, and Gelsomina Pappalardo
Geosci. Instrum. Method. Data Syst., 6, 453–472, https://doi.org/10.5194/gi-6-453-2017, https://doi.org/10.5194/gi-6-453-2017, 2017
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The term system-of-systems with respect to observational capabilities is frequently used, but what does it mean and how can it be assessed? Here, we define one possible interpretation of a system-of-systems architecture that is based upon demonstrable aspects of observing capabilities. We develop a set of assessment strands and then apply these to a set of atmospheric observational networks to decide which observations may be suitable for characterising satellite platforms in future work.
Alexandre Gonsette, Jean Rasson, Stephan Bracke, Antoine Poncelet, Olivier Hendrickx, and François Humbled
Geosci. Instrum. Method. Data Syst., 6, 439–446, https://doi.org/10.5194/gi-6-439-2017, https://doi.org/10.5194/gi-6-439-2017, 2017
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Absolute magnetic measurements require the vertical and the geographic north as reference directions. We present here a novel system able to measure the direction of the magnetic field and of the vertical and true north. A design of a north seeker is proposed that takes into account sensor bias as well as misalignment errors. Different methods are derived from this model and measurement results are presented. A measurement test at high latitude is also shown.
Wilhelm Nikonow and Dieter Rammlmair
Geosci. Instrum. Method. Data Syst., 6, 429–437, https://doi.org/10.5194/gi-6-429-2017, https://doi.org/10.5194/gi-6-429-2017, 2017
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This work describes a new approach to use fast X-ray fluorescence mapping as a tool for automated mineralogy applied on thin sections of plutonic rocks. Using a supervised classification of the spectral information, mineral maps are obtained for modal mineralogy and image analysis. The results are compared to a conventional method for automated mineralogy, which is scanning electron microscopy with mineral liberation analyzer, showing a good overall accuracy of 76 %.
E. William Worthington and Jürgen Matzka
Geosci. Instrum. Method. Data Syst., 6, 419–427, https://doi.org/10.5194/gi-6-419-2017, https://doi.org/10.5194/gi-6-419-2017, 2017
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We have compared two methods of performing Absolute observations of the Earth's magnetic field. The newer, Residual method was evaluated for use at USGS geomagnetic observatories and compared with measurements using the traditional Null method. A mathematical outline of the Residual method is presented, including more precise conversions of the Declination angles to nanoTeslas (nT). Results show that the Residual method is better than the Null method, especially at high latitude.
Achim Morschhauser, Gabriel Brando Soares, Jürgen Haseloff, Oliver Bronkalla, José Protásio, Katia Pinheiro, and Jürgen Matzka
Geosci. Instrum. Method. Data Syst., 6, 367–376, https://doi.org/10.5194/gi-6-367-2017, https://doi.org/10.5194/gi-6-367-2017, 2017
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We report on the history and recent developments of the Tatuoca magnetic observatory in Brazil. This observatory is located close to the geomagnetic equator and within a region of strong main field dynamics. Starting from 2015, we have installed new instrumentation and a new datalogger system. In the paper, we also comment on the challenges of doing absolute measurements at the geomagnetic equator.
Antoine Poncelet, Alexandre Gonsette, and Jean Rasson
Geosci. Instrum. Method. Data Syst., 6, 353–360, https://doi.org/10.5194/gi-6-353-2017, https://doi.org/10.5194/gi-6-353-2017, 2017
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In this paper, we give some background on calibration and verification of our automatic DI-flux instrument and then compare the automatic absolute magnetic measurements
with the human-made and discuss the advantages and disadvantages of automatic measurements.
Alexandre Gonsette, Jean Rasson, and François Humbled
Geosci. Instrum. Method. Data Syst., 6, 361–366, https://doi.org/10.5194/gi-6-361-2017, https://doi.org/10.5194/gi-6-361-2017, 2017
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We present a novel method for calibrating magnetic observatories. We show how magnetometer baselines can highlight a possible calibration error. We also provide a method based on high-frequency automatic absolute measurements. This method determines a transformation matrix for correcting raw data suffering from scale factor and orientation errors. We finally present a practical case where covered data have been successfully compared to those coming from a reference magnetometer.
Achim Morschhauser, Jürgen Haseloff, Oliver Bronkalla, Carsten Müller-Brettschneider, and Jürgen Matzka
Geosci. Instrum. Method. Data Syst., 6, 345–352, https://doi.org/10.5194/gi-6-345-2017, https://doi.org/10.5194/gi-6-345-2017, 2017
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A modern geomagnetic observatory is expected to record geomagnetic data with high stability, high resolution, and high reliability. Also, geomagnetic observatories may be located in remote areas, requiring low power consumption and simple maintenance. Here, we present a new data logger system that was designed to meet these criteria. This system is based on a Raspberry Pi embedded PC and includes a modular C++ software package which can be adapted to specific observatory setups.
Xinyue Zhang, Qisheng Zhang, Xiao Zhao, Qimao Zhang, Shenghui Liu, Shuhan Li, and Zhenzhong Yuan
Geosci. Instrum. Method. Data Syst., 6, 209–215, https://doi.org/10.5194/gi-6-209-2017, https://doi.org/10.5194/gi-6-209-2017, 2017
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In this study, we propose a more accurate method for calculating the current velocity from the nanovolt-scale current-induced electric field as measured using an expendable current profiler (XCP). In order to confirm the accuracy of the proposed data processing method, a sea test was performed, wherein ocean current/electric field data were collected from the sea surface to a depth of 1000 m using an XCP.
Thomas Albin, Detlef Koschny, Sirko Molau, Ralf Srama, and Björn Poppe
Geosci. Instrum. Method. Data Syst., 6, 125–140, https://doi.org/10.5194/gi-6-125-2017, https://doi.org/10.5194/gi-6-125-2017, 2017
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The Canary Islands Long-Baseline Observatory (CILBO) is a stereoscopic camera setup on the Canary Islands Tenerife and La Palma. Both cameras observe the same volume in the sky to determine high-precision orbits of entering meteoroids. Both cameras are identical; however they show different brightness or velocity distributions of the observed meteors. This work analyses different observational bias effects to determine and understand, e.g. camera pointing or observation time-dependent effects.
Fred Sigernes, Pål Gunnar Ellingsen, Noora Partamies, Mikko Syrjäsuo, Pål Brekke, Silje Eriksen Holmen, Arne Danielsen, Bernt Olsen, Xiangcai Chen, Margit Dyrland, Lisa Baddeley, Dag Arne Lorentzen, Marcus Aleksander Krogtoft, Torstein Dragland, Hans Mortensson, Lisbeth Smistad, Craig J. Heinselman, and Shadia Habbal
Geosci. Instrum. Method. Data Syst., 6, 9–14, https://doi.org/10.5194/gi-6-9-2017, https://doi.org/10.5194/gi-6-9-2017, 2017
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The total solar eclipse event on Svalbard on 20 March 2015 gave us a unique opportunity to image the upper parts of the Sun's atmosphere. A novel image accumulation filter technique is presented that is capable of distinguishing features such as loops, spicules, plumes, and prominences from intense and blurry video recordings of the chromosphere.
Timo Sukuvaara, Kari Mäenpää, and Riika Ylitalo
Geosci. Instrum. Method. Data Syst., 5, 513–520, https://doi.org/10.5194/gi-5-513-2016, https://doi.org/10.5194/gi-5-513-2016, 2016
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FMI's combined road weather station (RWS) and roadside unit (RSU) in Sodankylä is a unique research platform combining very advanced road weather measurements with a versatile collection of the most common wireless communication methodologies used in a vehicular environment. Together with harsh Arctic road weather conditions it represents an incomparable development environment and pilot RWS station within the field of intelligent transport systems and vehicular networking.
Brian J. Jackel, Craig Unick, Fokke Creutzberg, Greg Baker, Eric Davis, Eric F. Donovan, Martin Connors, Cody Wilson, Jarrett Little, M. Greffen, and Neil McGuffin
Geosci. Instrum. Method. Data Syst., 5, 493–512, https://doi.org/10.5194/gi-5-493-2016, https://doi.org/10.5194/gi-5-493-2016, 2016
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In order to compare auroral observations, it is necessary to ensure that all instruments are properly calibrated. This can be difficult to achieve with different instruments operated for extended intervals at remote field sites under harsh conditions. Astronomical sources can be used for independent absolute calibration procedures. Under ideal conditions Jupiter is an excellent source, as it can provide more light than the brightest star. We use Jupiter to calibrate an auroral MSP network.
Cited articles
Abudu, S., Bawazir, A. S., and King, J. P.: Infilling Missing Daily Evapotranspiration Data Using Neural Networks, J. Irrig. Drain. Eng., 136, 317–325, 2010.
Alavi, N., Warland, J. S., and Berg, A. A.: Filling gaps in evapotranspiration measurements for water budget studies: Evaluation of a Kalman filtering approach, Agr. Forest Meteorol., 141, 57–66, 2006.
Allen, R. G., Pereira, L. S., Raes, D., and Smith, M.: Crop evapotranspiration-Guidelines for computing crop water requirements-FAO Irrigation and drainage paper 56, FAO, Rome, 300, D05109, 1998.
Appels, W. M., Bogaart, P. W., and van der Zee, S. E. A. T. M.: Surface runoff in flat terrain: How field topography and runoff generating processes control hydrological connectivity, J. Hydrol., 534, 493–504, 2016.
Aubinet, M., Grelle, A., Ibrom, A., Rannik, Ü., Moncrieff, J., Foken, T., Kowalski, A.S., Martin, P.H., Berbigier, P., Bernhofer, C., Clement, R., Elbers, J., Granier, A., Grünwald, T., Morgenstern, K., Pilegaard, K., Rebmann, C., Snijders, W., Valentini, R., and Vesala, T.: Estimates of the Annual Net Carbon and Water Exchange of Forests: The EUROFLUX Methodology, edited by: Fitter, A. H. and Raffaelli, D. G., Adv. Ecol. Res., 113–175, Academic Press, 1999.
Baldocchi, D., Finnigan, J., Wilson, K., Paw, U, K. T., and Falge, E.: On Measuring Net Ecosystem Carbon Exchange Over Tall Vegetation on Complex Terrain, Bound.-Lay. Meteorol., 96, 257–291, 2000.
Baldocchi, D., Falge, E., Gu, L., Olson, R., Hollinger, D., Running, S., Anthoni, P., Bernhofer, C., Davis, K., Evans, R., Fuentes, J., Goldstein, A., Katul, G., Law, B., Lee, X., Malhi, Y., Meyers, T., Munger, W., Oechel, W., Paw, K. T., Pilegaard, K., Schmid, H. P., Valentini, R., Verma, S., Vesala, T., Wilson, K., and Wofsy, S.: FLUXNET: A New Tool to Study the Temporal and Spatial Variability of Ecosystem–Scale Carbon Dioxide, Water Vapor, and Energy Flux Densities, B. Am. Meteorol. Soc., 82, 2415–2434, 2001.
Beringer, J., Hutley, L. B., Tapper, N. J., and Cernusak, L. A.: Savanna fires and their impact on net ecosystem productivity in North Australia, Global Change Biol., 13, 990–1004, 2007.
Blyth, E. M.: Estimating Potential Evaporation over a Hill, Bound.-Layer Meteorol., 92, 185–193, 1999.
Chen, Y.-Y., Chu, C.-R., and Li, M.-H.: A gap-filling model for eddy covariance latent heat flux: Estimating evapotranspiration of a subtropical seasonal evergreen broad-leaved forest as an example, J. Hydrol., 468–469, 101–110, 2012.
Cleverly, J. R., Dahm, C. N., Thibault, J. R., Gilroy, D. J., and Allred Coonrod, J. E.: Seasonal estimates of actual evapo-transpiration from Tamarix ramosissima stands using three-dimensional eddy covariance, J. Arid Environ., 52, 181–197, 2002.
Crago, R. D.: Conservation and variability of the evaporative fraction during the daytime, J. Hydrol., 180, 173–194, 1996.
Crago, R. and Brutsaert, W.: Daytime evaporation and the self-preservation of the evaporative fraction and the Bowen ratio, J. Hydrol., 178, 241–255, 1996.
Dupont, S., Brunet, Y., and Finnigan, J. J.: Large-eddy simulation of turbulent flow over a forested hill: Validation and coherent structure identification, Q. J. Roy. Meteorol. Soc., 134, 1911–1929, 2008.
Eamus, D., Cleverly, J., Boulain, N., Grant, N., Faux, R., and Villalobos-Vega, R.: Carbon and water fluxes in an arid-zone Acacia savanna woodland: An analyses of seasonal patterns and responses to rainfall events, Agr. Forest Meteorol., 182–183, 225–238, 2013.
Falge, E., Baldocchi, D., Olson, R., Anthoni, P., Aubinet, M., Bernhofer, C., Burba, G., Ceulemans, R., Clement, R., Dolman, H., Granier, A., Gross, P., Grünwald, T., Hollinger, D., Jensen, N.-O., Katul, G., Keronen, P., Kowalski, A., Lai, C.T., Law, B.E., Meyers, T., Moncrieff, J., Moors, E., Munger, J. W., Pilegaard, K., Rannik, Ü., Rebmann, C., Suyker, A., Tenhunen, J., Tu, K., Verma, S., Vesala, T., Wilson, K., and Wofsy, S.: Gap filling strategies for defensible annual sums of net ecosystem exchange, Agr. Forest Meteorol., 107, 43–69, 2001a.
Falge, E., Baldocchi, D., Olson, R., Anthoni, P., Aubinet, M., Bernhofer, C., Burba, G., Ceulemans, R., Clement, R., Dolman, H., Granier, A., Gross, P., Grünwald, T., Hollinger, D., Jensen, N.-O., Katul, G., Keronen, P., Kowalski, A., Ta Lai, C., Law, B. E., Meyers, T., Moncrieff, J., Moors, E., William Munger, J., Pilegaard, K., Rannik, Ü., Rebmann, C., Suyker, A., Tenhunen, J., Tu, K., Verma, S., Vesala, T., Wilson, K., and Wofsy, S.: Gap filling strategies for long term energy flux data sets, Agr. Forest Meteorol., 107, 71–77, 2001b.
Foken, T.: The energy balance closure problem: an overview, Ecol. Appl., 18, 1351–1367, 2008.
Foken, T. and Wichura, B.: Tools for quality assessment of surface-based flux measurements, Agr. Forest Meteorol., 78, 83–105, 1996.
Foken, T., Göockede, M., Mauder, M., Mahrt, L., Amiro, B., and Munger, W.: Post-Field Data Quality Control, edited by: Lee, X., Massman, W., and Law, B., Handbook of Micrometeorology (181–208), Springer Netherlands, 2005.
Geissbühler, P., Siegwolf, R., and Eugster, W.: Eddy Covariance Measurements On Mountain Slopes: The Advantage Of Surface-Normal Sensor Orientation Over A Vertical Set-Up, Bound.-Lay. Meteorol., 96, 371–392, 2000.
Gentine, P., Entekhabi, D., and Polcher, J.: The Diurnal Behavior of Evaporative Fraction in the Soil–Vegetation–Atmospheric Boundary Layer Continuum, J. Hydrometeorol., 12, 1530–1546, 2011.
Goulden, M. L., Munger, J. W., Fan, S.-M., Daube, B. C., and Wofsy, S. C.: Measurements of carbon sequestration by long-term eddy covariance: methods and a critical evaluation of accuracy, Global Change Biol., 2, 169–182, 1996.
Greco, S. and Baldocchi, D. D.: Seasonal variations of CO2 and water vapour exchange rates over a temperate deciduous forest, Global Change Biol., 2, 183–197, 1996.
Grünwald, T. and Bernhofer, C.: Regression modelling used for data gap filling of carbon flux measurements, Forest Ecosyst. Modell., Upscal. Remote Sens., 61, 61–67, 1999.
Hammerle, A., Haslwanter, A., Schmitt, M., Bahn, M., Tappeiner, U., Cernusca, A., and Wohlfahrt, G.: Eddy covariance measurements of carbon dioxide, latent and sensible energy fluxes above a meadow on a mountain slope, Bound.-Lay. Meteorol., 122, 397–416, 2007.
Hiller, R., Zeeman, M., and Eugster, W.: Eddy-Covariance Flux Measurements in the Complex Terrain of an Alpine Valley in Switzerland, Bound.-Lay. Meteorol., 127, 449–467, 2008.
Hoedjes, J. C. B., Chehbouni, A., Jacob, F., Ezzahar, J., and Boulet, G.: Deriving daily evapotranspiration from remotely sensed instantaneous evaporative fraction over olive orchard in semi-arid Morocco, J. Hydrol., 354, 53–64, 2008.
Holst, T., Rost, J., and Mayer, H.: Net radiation balance for two forested slopes on opposite sides of a valley, Int. J. Biometeorol., 49, 275–284, 2005.
Hui, D., Wan, S., Su, B., Katul, G., Monson, R., and Luo, Y.: Gap-filling missing data in eddy covariance measurements using multiple imputation (MI) for annual estimations, Agr. Forest Meteorol., 121, 93–111, 2004.
Jacob, F., Olioso, A., Weiss, M., Baret, F., and Hautecoeur, O.: Mapping short-wave albedo of agricultural surfaces using airborne PolDER data, Remote Sens. Environ., 80, 36–46, 2002.
Kaimal, J. C. and Finnigan, J. J.: Atmospheric boundary layer flows: their structure and measurement, Oxford University Press, 1994.
Lancashire, P. D., Bleiholder, H., Boom, T. V. D., Langelüddeke, P., Stauss, R., Weber, E., and Witzenberger, A.: A uniform decimal code for growth stages of crops and weeds, Ann. Appl. Biol., 119, 561–601, 1991.
Law, B. E., Falge, E., Gu, L., Baldocchi, D.D., Bakwin, P., Berbigier, P., Davis, K., Dolman, A. J., Falk, M., Fuentes, J. D., Goldstein, A., Granier, A., Grelle, A., Hollinger, D., Janssens, I. A., Jarvis, P., Jensen, N. O., Katul, G., Mahli, Y., Matteucci, G., Meyers, T., Monson, R., Munger, W., Oechel, W., Olson, R., Pilegaard, K., Paw U, K. T., Thorgeirsson, H., Valentini, R., Verma, S., Vesala, T., Wilson, K., and Wofsy, S.: Environmental controls over carbon dioxide and water vapor exchange of terrestrial vegetation, Agr. Forest Meteorol., 113, 97–120, 2002.
Leuning, R., van Gorsel, E., Massman, W. J., and Isaac, P. R.: Reflections on the surface energy imbalance problem, Agr. Forest Meteorol., 156, 65–74, 2012.
Li, S., Kang, S., Li, F., Zhang, L., and Zhang, B.: Vineyard evaporative fraction based on eddy covariance in an arid desert region of Northwest China, Agr. Water Manage., 95, 937–948, 2008.
McVicar, T. R., Van Niel, T. G., Li, L., Hutchinson, M. F., Mu, X., and Liu, Z.: Spatially distributing monthly reference evapotranspiration and pan evaporation considering topographic influences, J. Hydrol., 338, 196–220, 2007.
Mekki, I., Albergel, J., Ben Mechlia, N., and Voltz, M.: Assessment of overland flow variation and blue water production in a farmed semi-arid water harvesting catchment, Phys. Chem. Earth, Parts A/B/C, 31, 1048–1061, 2006.
Moffat, A. M., Papale, D., Reichstein, M., Hollinger, D. Y., Richardson, A. D., Barr, A. G., Beckstein, C., Braswell, B. H., Churkina, G., Desai, A. R., Falge, E., Gove, J. H., Heimann, M., Hui, D., Jarvis, A. J., Kattge, J., Noormets, A., and Stauch, V. J.: Comprehensive comparison of gap-filling techniques for eddy covariance net carbon fluxes, Agr. Forest Meteorol., 147, 209–232, 2007.
Molénat, J., Raclot, D., Zitouna, Rim, Andrieux, P., Coulouma, G., Feurer, D., Grunberger, O., Lamachère, J.-M., Bailly, J.-S., Belotti, J.-L., Ben Azzez, K., Ben Mechlia, N., Ben Younès Louati, M., Biarnès, A., Blanca, Y., Carrière, D., Chaabane, H., Dagès, C., Debabria, A., Dubreuil, A., Fabre, J.-C., Fages, D., Floure, C., Garnier, F., Geniez, C., Gomez, C., Hamdi, R., Huttel, O., Jacob, F., Jenhaoui, Z., Lagacherie, P., Le Bissonnais, Y., Louati, R., Louchart, X., Mekki, I., Moussa, R., Negro, S., Pépin, Y., Prévot, L., Samouelian, A., Seidel, J.-L., Trotoux, G., Troiano, S., Vinatier, F., Zante, P., Zrelli, J., Albergel, J., and Voltz, M.: OMERE, a long-term observatory of soil and water resources in interaction with agricultural and land management in Mediterranean hilly catchments, Vadoze Zone J., under review, 2018.
Montes, C., Lhomme, J.-P., Demarty, J., Prévot, L., and Jacob, F.: A three-source SVAT modeling of evaporation: Application to the seasonal dynamics of a grassed vineyard, Agr. Forest Meteorol., 191, 64–80, 2014.
Moussa, R., Chahinian, N., and Bocquillon, C.: Distributed hydrological modelling of a Mediterranean mountainous catchment – Model construction and multi-site validation, J. Hydrol., 337, 35–51, 2007.
Olioso, A., Inoue, Y., Ortega-Farias, S., Demarty, J., Wigneron, J. P., Braud, I., Jacob, F., Lecharpentier, P., OttlÉ, C., Calvet, J. C., and Brisson, N.: Future directions for advanced evapotranspiration modeling: Assimilation of remote sensing data into crop simulation models and SVAT models, Irrig. Drain. Syst., 19, 377–412, 2005.
Papale, D. and Valentini, R.: A new assessment of European forests carbon exchanges by eddy fluxes and artificial neural network spatialization, Global Change Biol., 9, 525–535, 2003.
Papale, D., Reichstein, M., Aubinet, M., Canfora, E., Bernhofer, C., Kutsch, W., Longdoz, B., Rambal, S., Valentini, R., Vesala, T., and Yakir, D.: Towards a standardized processing of Net Ecosystem Exchange measured with eddy covariance technique: algorithms and uncertainty estimation, Biogeosciences, 3, 571–583, https://doi.org/10.5194/bg-3-571-2006, 2006.
Pattey, E., Edwards, G., Strachan, I. B., Desjardins, R. L., Kaharabata, S., and Wagner Riddle, C.: Towards standards for measuring greenhouse gas fluxes from agricultural fields using instrumented towers, Can. J. Soil Sci., 86, 373–400, 2006.
Peng, J., Borsche, M., Liu, Y., and Loew, A.: How representative are instantaneous evaporative fraction measurements of daytime fluxes?, Hydrol. Earth Syst. Sci., 17, 3913–3919, https://doi.org/10.5194/hess-17-3913-2013, 2013.
Prima, O. D. A., Echigo, A., Yokoyama, R., and Yoshida, T.: Supervised landform classification of Northeast Honshu from DEM-derived thematic maps, Geomorphology, 78, 373–386, 2006.
Raclot, D. and Albergel, J.: Runoff and water erosion modelling using WEPP on a Mediterranean cultivated catchment, Phys. Chem. Earth, Parts A/B/C, 31, 1038–1047, 2006.
Rana, G., Ferrara, R. M., Martinelli, N., Personnic, P., and Cellier, P.: Estimating energy fluxes from sloping crops using standard agrometeorological measurements and topography, Agr. Forest Meteorol., 146, 116–133, 2007.
Raupach, M. R. and Finnigan, J. J.: The influence of topography on meteorogical variables and surface-atmosphere interactions, J. Hydrol., 190, 182–213, 1997.
Rebmann, C., Göckede, M., Foken, T., Aubinet, M., Aurela, M., Berbigier, P., Bernhofer, C., Buchmann, N., Carrara, A., Cescatti, A., Ceulemans, R., Clement, R., Elbers, J.A., Granier, A., Grünwald, T., Guyon, D., Havránková, K., Heinesch, B., Knohl, A., Laurila, T., Longdoz, B., Marcolla, B., Markkanen, T., Miglietta, F., Moncrieff, J., Montagnani, L., Moors, E., Nardino, M., Ourcival, J.M., Rambal, S., Rannik, Ü., Rotenberg, E., Sedlak, P., Unterhuber, G., Vesala, T., and Yakir, D.: Quality analysis applied on eddy covariance measurements at complex forest sites using footprint modelling, Theor. Appl. Climatol., 80, 121–141, 2005.
Reichstein, M., Falge, E., Baldocchi, D., Papale, D., Aubinet, M., Berbigier, P., Bernhofer, C., Buchmann, N., Gilmanov, T., Granier, A., Grünwald, T., Havránková, K., Ilvesniemi, H., Janous, D., Knohl, A., Laurila, T., Lohila, A., Loustau, D., Matteucci, G., Meyers, T., Miglietta, F., Ourcival, J.-M., Pumpanen, J., Rambal, S., Rotenberg, E., Sanz, M., Tenhunen, J., Seufert, G., Vaccari, F., Vesala, T., Yakir, D., and Valentini, R.: On the separation of net ecosystem exchange into assimilation and ecosystem respiration: review and improved algorithm, Global Change Biol., 11, 1424–1439, 2005.
Roupsard, O., Bonnefond, J.-M., Irvine, M., Berbigier, P., Nouvellon, Y., Dauzat, J., Taga, S., Hamel, O., Jourdan, C., Saint-André, L., Mialet-Serra, I., Labouisse, J.-P., Epron, D., Joffre, R., Braconnier, S., Rouzière, A., Navarro, M., and Bouillet, J.-P.: Partitioning energy and evapo-transpiration above and below a tropical palm canopy, Agr. Forest Meteorol., 139, 252–268, 2006.
Ruppert, J., Mauder, M., Thomas, C., and Lüers, J.: Innovative gap-filling strategy for annual sums of CO2 net ecosystem exchange, Agr. Forest Meteorol., 138, 5–18, 2006.
Shuttleworth, W., Gurney, R., Hsu, A., and Ormsby, J.: FIFE: the variation in energy partition at surface flux sites, IAHS Publ, 186, 67–74, 1989.
Turnipseed, A. A., Anderson, D. E., Blanken, P. D., Baugh, W. M., and Monson, R. K.: Airflows and turbulent flux measurements in mountainous terrain: Part 1. Canopy and local effects, Agr. Forest Meteorol., 119, 1–21, 2003.
Van Dijk, A., Moene, A., and De Bruin, H.: The principles of surface flux physics: theory, practice and description of the ECPACK library, Meteorology and Air Quality Group, Wageningen University, Wageningen, The Netherlands, 99, 2004.
Van Niel, T. G., McVicar, T. R., Roderick, M. L., van Dijk, A. I. J. M., Renzullo, L. J., and van Gorsel, E.: Correcting for systematic error in satellite-derived latent heat flux due to assumptions in temporal scaling: Assessment from flux tower observations, J. Hydrol., 409, 140–148, 2011.
Wilson, K., Goldstein, A., Falge, E., Aubinet, M., Baldocchi, D., Berbigier, P., Bernhofer, C., Ceulemans, R., Dolman, H., Field, C., Grelle, A., Ibrom, A., Law, B.E., Kowalski, A., Meyers, T., Moncrieff, J., Monson, R., Oechel, W., Tenhunen, J., Valentini, R., and Verma, S.: Energy balance closure at FLUXNET sites, Agr. Forest Meteorol., 113, 223–243, 2002.
Yang, F., Zhang, Q., Wang, R., and Zhou, J.: Evapotranspiration Measurement and Crop Coefficient Estimation over a Spring Wheat Farmland Ecosystem in the Loess Plateau, PLoS ONE, 9, e100031, https://doi.org/10.1371/journal.pone.0100031 2014.
Zitouna-Chebbi, R.: Observations et caractérisation des échanges d'eau et d'énergie dans le continuum sol-plante-atmosphère en condition de relief collinaire: cas du bassin versant Kamech, Cap Bon, Tunisie, in: École Doctoral SIBAGHE, p. 292, Montpellier SupAgro: Montpellier SupAgro, 2009.
Zitouna-Chebbi, R., Prévot, L., Jacob, F., Mougou, R., and Voltz, M.: Assessing the consistency of eddy covariance measurements under conditions of sloping topography within a hilly agricultural catchment, Agr. Forest Meteorol., 164, 123–135, 2012.
Zitouna-Chebbi, R., Prévot, L., Jacob, F., and Voltz, M.: Accounting for vegetation height and wind direction to correct eddy covariance measurements of energy fluxes over hilly crop fields, J. Geophys. Res.-Atmos., 120, 4920–4936, 2015.
Short summary
To provide reliable time series of evapotranspiration, we evaluated the performances of four different gap-filling methods when tailored to conditions of hilly crop fields. The tailoring consisted of splitting the time series beforehand on the basis of upslope and downslope winds. The obtained accuracies on evapotranspiration after gap filling were comparable to those previously reported over flat and mountainous terrains, and they were better with the most widely used gap-filling method.
To provide reliable time series of evapotranspiration, we evaluated the performances of four...
