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The effect of relat...
The effect of relative humidity on eddy covariance latent heat flux measurements and its implication for partitioning into transpiration and evaporation
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- Zhang, Weijie (författare)
- Max Planck Institute for Biogeochemistry,Ghent University
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- Jung, Martin (författare)
- Max Planck Institute for Biogeochemistry
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- Migliavacca, Mirco (författare)
- Max Planck Institute for Biogeochemistry,European Commission Joint Research Centre, Brussels
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- Poyatos, Rafael (författare)
- Centre for Ecological Research and Forestry (CERAF),Autonomous University of Barcelona
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- Miralles, Diego G. (författare)
- Ghent University
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- El-Madany, Tarek S. (författare)
- Max Planck Institute for Biogeochemistry
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- Galvagno, Marta (författare)
- Environmental Protection Agency of Aosta Valley
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- Carrara, Arnaud (författare)
- Fundacion Centro de Estudios Ambientales del Mediterraneo (CEAM)
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- Arriga, Nicola (författare)
- European Commission Joint Research Centre, Brussels
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- Ibrom, Andreas (författare)
- Technical University of Denmark
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- Mammarella, Ivan (författare)
- University of Helsinki
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- Papale, Dario (författare)
- Euro-Mediterranean Center on Climate Change,University of Tuscia
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- Cleverly, Jamie R. (författare)
- James Cook University
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- Liddell, Michael (författare)
- James Cook University
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- Wohlfahrt, Georg (författare)
- University of Innsbruck
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- Markwitz, Christian (författare)
- University of Göttingen
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- Mauder, Matthias (författare)
- Dresden University of Technology
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- Paul-Limoges, Eugenie (författare)
- University of Zurich
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- Schmidt, Marius (författare)
- Jülich Research Centre
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- Wolf, Sebastian (författare)
- ETH Zürich
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- Brümmer, Christian (författare)
- Thünen Institute of Climate-Smart Agriculture
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- Arain, M. Altaf (författare)
- McMaster University
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- Fares, Silvano (författare)
- CNR Istituto per le Tecnologie Applicate ai Beni Culturali (CNR-ITABC)
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- Kato, Tomomichi (författare)
- Hokkaido University
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- Ardö, Jonas (författare)
- Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science
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- Oechel, Walter (författare)
- San Diego State University,University of Exeter
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- Hanson, Chad (författare)
- Oregon State University
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- Korkiakoski, Mika (författare)
- University of Helsinki
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- Biraud, Sébastien (författare)
- Lawrence Berkeley National Laboratory
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- Steinbrecher, Rainer (författare)
- Karlsruhe Institute of Technology
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- Billesbach, Dave (författare)
- University of Nebraska - Lincoln
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- Montagnani, Leonardo (författare)
- Free University of Bozen-Bolzano
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- Woodgate, William (författare)
- University of Queensland,Commonwealth Scientific and Industrial Research Organisation (CSIRO)
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- Shao, Changliang (författare)
- Chinese Academy of Agricultural Sciences
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- Carvalhais, Nuno (författare)
- NOVA University Lisbon,Max Planck Institute for Biogeochemistry
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- Reichstein, Markus (författare)
- Max Planck Institute for Biogeochemistry,Michael Stifel Center Jena for Data-driven and Simulation Science
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- Nelson, Jacob A. (författare)
- Max Planck Institute for Biogeochemistry
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(creator_code:org_t)
- Elsevier BV, 2023
- 2023
- Engelska.
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Ingår i: Agricultural and Forest Meteorology. - : Elsevier BV. - 0168-1923. ; 330
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- While the eddy covariance (EC) technique is a well-established method for measuring water fluxes (i.e., evaporation or 'evapotranspiration’, ET), the measurement is susceptible to many uncertainties. One such issue is the potential underestimation of ET when relative humidity (RH) is high (>70%), due to low-pass filtering with some EC systems. Yet, this underestimation for different types of EC systems (e.g. open-path or closed-path sensors) has not been characterized for synthesis datasets such as the widely used FLUXNET2015 dataset. Here, we assess the RH-associated underestimation of latent heat fluxes (LE, or ET) from different EC systems for 163 sites in the FLUXNET2015 dataset. We found that the LE underestimation is most apparent during hours when RH is higher than 70%, predominantly observed at sites using closed-path EC systems, but the extent of the LE underestimation is highly site-specific. We then propose a machine learning based method to correct for this underestimation, and compare it to two energy balance closure based LE correction approaches (Bowen ratio correction, BRC, and attributing all errors to LE). Our correction increases LE by 189% for closed-path sites at high RH (>90%), while BRC increases LE by around 30% for all RH conditions. Additionally, we assess the influence of these corrections on ET-based transpiration (T) estimates using two different ET partitioning methods. Results show opposite responses (increasing vs. slightly decreasing T-to-ET ratios, T/ET) between the two methods when comparing T based on corrected and uncorrected LE. Overall, our results demonstrate the existence of a high RH bias in water fluxes in the FLUXNET2015 dataset and suggest that this bias is a pronounced source of uncertainty in ET measurements to be considered when estimating ecosystem T/ET and WUE.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Nyckelord
- Eddy covariance
- Energy balance closure
- Evapotranspiration
- FLUXNET
- Latent energy
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Zhang, Weijie
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Jung, Martin
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Migliavacca, Mir ...
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Poyatos, Rafael
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Miralles, Diego ...
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El-Madany, Tarek ...
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visa fler...
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Galvagno, Marta
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Carrara, Arnaud
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Arriga, Nicola
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Ibrom, Andreas
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Mammarella, Ivan
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Papale, Dario
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Cleverly, Jamie ...
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Liddell, Michael
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Wohlfahrt, Georg
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Markwitz, Christ ...
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Mauder, Matthias
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Paul-Limoges, Eu ...
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Schmidt, Marius
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Wolf, Sebastian
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Brümmer, Christi ...
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Arain, M. Altaf
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Fares, Silvano
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Kato, Tomomichi
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Ardö, Jonas
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Oechel, Walter
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Hanson, Chad
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Korkiakoski, Mik ...
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Biraud, Sébastie ...
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Steinbrecher, Ra ...
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Billesbach, Dave
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Montagnani, Leon ...
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Woodgate, Willia ...
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Shao, Changliang
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Carvalhais, Nuno
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Reichstein, Mark ...
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Nelson, Jacob A.
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