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478 results on '"Mauder, Matthias"'

11. The effect of relative humidity on eddy covariance latent heat flux measurements and its implication for partitioning into transpiration and evaporation

Author

Zhang, Weijie, Jung, Martin, Migliavacca, Mirco, Poyatos, Rafael, Miralles, Diego G, El-Madany, Tarek S, Galvagno, Marta, Carrara, Arnaud, Arriga, Nicola, Ibrom, Andreas, Mammarella, Ivan, Papale, Dario, Cleverly, Jamie R, Liddell, Michael, Wohlfahrt, Georg, Markwitz, Christian, Mauder, Matthias, Paul-Limoges, Eugenie, Schmidt, Marius, Wolf, Sebastian, Brümmer, Christian, Arain, M Altaf, Fares, Silvano, Kato, Tomomichi, Ardö, Jonas, Oechel, Walter, Hanson, Chad, Korkiakoski, Mika, Biraud, Sébastien, Steinbrecher, Rainer, Billesbach, Dave, Montagnani, Leonardo, Woodgate, William, Shao, Changliang, Carvalhais, Nuno, Reichstein, Markus, and Nelson, Jacob A

Subjects
Earth Sciences, Atmospheric Sciences, Evapotranspiration, Energy balance closure, Latent energy, FLUXNET, Eddy covariance, Biological Sciences, Agricultural and Veterinary Sciences, Meteorology & Atmospheric Sciences, Agricultural, veterinary and food sciences, Biological sciences, Earth sciences
Abstract

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.

Published
2023

20. Monitoring of carbon-water fluxes at Eurasian meteorological stations using random forest and remote sensing

Author

Xie, Mingjuan, Ma, Xiaofei, Wang, Yuangang, Li, Chaofan, Shi, Haiyang, Yuan, Xiuliang, Hellwich, Olaf, Chen, Chunbo, Zhang, Wenqiang, Zhang, Chen, Ling, Qing, Gao, Ruixiang, Zhang, Yu, Ochege, Friday Uchenna, Frankl, Amaury, De Maeyer, Philippe, Buchmann, Nina, Feigenwinter, Iris, Olesen, Jørgen E., Juszczak, Radoslaw, Jacotot, Adrien, Korrensalo, Aino, Pitacco, Andrea, Varlagin, Andrej, Shekhar, Ankit, Lohila, Annalea, Carrara, Arnaud, Brut, Aurore, Kruijt, Bart, Loubet, Benjamin, Heinesch, Bernard, Chojnicki, Bogdan, Helfter, Carole, Vincke, Caroline, Shao, Changliang, Bernhofer, Christian, Brümmer, Christian, Wille, Christian, Tuittila, Eeva-Stiina, Nemitz, Eiko, Meggio, Franco, Dong, Gang, Lanigan, Gary, Niedrist, Georg, Wohlfahrt, Georg, Zhou, Guoyi, Goded, Ignacio, Gruenwald, Thomas, Olejnik, Janusz, Jansen, Joachim, Neirynck, Johan, Tuovinen, Juha-Pekka, Zhang, Junhui, Klumpp, Katja, Pilegaard, Kim, Šigut, Ladislav, Klemedtsson, Leif, Tezza, Luca, Hörtnagl, Lukas, Urbaniak, Marek, Roland, Marilyn, Schmidt, Marius, Sutton, Mark A., Hehn, Markus, Saunders, Matthew, Mauder, Matthias, Aurela, Mika, Korkiakoski, Mika, Du, Mingyuan, Vendrame, Nadia, Kowalska, Natalia, Leahy, Paul G., Alekseychik, Pavel, Shi, Peili, Weslien, Per, Chen, Shiping, Fares, Silvano, Friborg, Thomas, Tallec, Tiphaine, Kato, Tomomichi, Sachs, Torsten, Maximov, Trofim, di Cella, Umberto Morra, Moderow, Uta, Li, Yingnian, He, Yongtao, Kosugi, Yoshiko, and Luo, Geping

Published
2023
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21. Joint optimization of land carbon uptake and albedo can help achieve moderate instantaneous and long-term cooling effects

Author

Graf, Alexander, Wohlfahrt, Georg, Aranda-Barranco, Sergio, Arriga, Nicola, Brümmer, Christian, Ceschia, Eric, Ciais, Philippe, Desai, Ankur R., Di Lonardo, Sara, Gharun, Mana, Grünwald, Thomas, Hörtnagl, Lukas, Kasak, Kuno, Klosterhalfen, Anne, Knohl, Alexander, Kowalska, Natalia, Leuchner, Michael, Lindroth, Anders, Mauder, Matthias, Migliavacca, Mirco, Morel, Alexandra C., Pfennig, Andreas, Poorter, Hendrik, Terán, Christian Poppe, Reitz, Oliver, Rebmann, Corinna, Sanchez-Azofeifa, Arturo, Schmidt, Marius, Šigut, Ladislav, Tomelleri, Enrico, Yu, Ke, Varlagin, Andrej, and Vereecken, Harry

Published
2023
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22. Incorporating the effect of heterogeneous surface heating into a semi-empirical model of the surface energy balance closure

Author

Wanner, Luise, Calaf, Marc, and Mauder, Matthias

Subjects
Physics - Atmospheric and Oceanic Physics
Abstract

It was discovered several decades ago that eddy covariance measurements systematically underestimate sensible and latent heat fluxes, creating an imbalance in the surface energy budget. Since then, many studies have addressed this problem and proposed a variety of solutions to the problem, including improvements to instruments and correction methods applied during data postprocessing. However, none of these measures have led to the complete closure of the energy balance gap. The leading hypothesis is that not only surface-attached turbulent eddies but also sub-mesoscale atmospheric circulations contribute to the transport of energy in the atmospheric boundary layer, and the contribution from organized motions has been grossly neglected. The problem arises because the transport of energy through these secondary circulations cannot be captured by the standard eddy covariance method given the relatively short averaging periods of time (~30 minutes) used to compute statistics. There are various approaches to adjust the measured heat fluxes by attributing the missing energy to the sensible and latent heat flux in different proportions. However, few correction methods are based on the processes causing the energy balance gap. Several studies have shown that the magnitude of the energy balance gap depends on the atmospheric stability and the heterogeneity scale of the landscape around the measurement site. Based on this, the energy balance gap within the surface layer has already been modelled as a function of a nonlocal atmospheric stability parameter by performing a large-eddy simulation study with idealized homogeneous surfaces. We have further developed this approach by including thermal surface heterogeneity in addition to atmospheric stability in the parameterization.

Published
2021
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23. Assimilating Sentinel-2 data in a modified vegetation photosynthesis and respiration model (VPRM) to improve the simulation of croplands CO2 fluxes in Europe

Author

Bazzi, Hassan, Ciais, Philippe, Abbessi, Ezzeddine, Makowski, David, Santaren, Diego, Ceschia, Eric, Brut, Aurore, Tallec, Tiphaine, Buchmann, Nina, Maier, Regine, Acosta, Manuel, Loubet, Benjamin, Buysse, Pauline, Léonard, Joël, Bornet, Frédéric, Fayad, Ibrahim, Lian, Jinghui, Baghdadi, Nicolas, Segura Barrero, Ricard, Brümmer, Christian, Schmidt, Marius, Heinesch, Bernard, Mauder, Matthias, and Gruenwald, Thomas

Published
2024
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24. Integrating continuous atmospheric boundary layer and tower-based flux measurements to advance understanding of land-atmosphere interactions

Author

Helbig, Manuel, Gerken, Tobias, Beamesderfer, Eric R, Baldocchi, Dennis D, Banerjee, Tirtha, Biraud, Sébastien C, Brown, William OJ, Brunsell, Nathaniel A, Burakowski, Elizabeth A, Burns, Sean P, Butterworth, Brian J, Chan, W Stephen, Davis, Kenneth J, Desai, Ankur R, Fuentes, Jose D, Hollinger, David Y, Kljun, Natascha, Mauder, Matthias, Novick, Kimberly A, Perkins, John M, Rahn, David A, Rey-Sanchez, Camilo, Santanello, Joseph A, Scott, Russell L, Seyednasrollah, Bijan, Stoy, Paul C, Sullivan, Ryan C, de Arellano, Jordi Vilà-Guerau, Wharton, Sonia, Yi, Chuixiang, and Richardson, Andrew D

Subjects
Earth Sciences, Atmospheric Sciences, Eddy covariance, Boundary layer, Land-atmosphere, Remote sensing, Atmospheric inversion models, Biological Sciences, Agricultural and Veterinary Sciences, Meteorology & Atmospheric Sciences, Agricultural, veterinary and food sciences, Biological sciences, Earth sciences
Abstract

The atmospheric boundary layer mediates the exchange of energy, matter, and momentum between the land surface and the free troposphere, integrating a range of physical, chemical, and biological processes and is defined as the lowest layer of the atmosphere (ranging from a few meters to 3 km). In this review, we investigate how continuous, automated observations of the atmospheric boundary layer can enhance the scientific value of co-located eddy covariance measurements of land-atmosphere fluxes of carbon, water, and energy, as are being made at FLUXNET sites worldwide. We highlight four key opportunities to integrate tower-based flux measurements with continuous, long-term atmospheric boundary layer measurements: (1) to interpret surface flux and atmospheric boundary layer exchange dynamics and feedbacks at flux tower sites, (2) to support flux footprint modelling, the interpretation of surface fluxes in heterogeneous and mountainous terrain, and quality control of eddy covariance flux measurements, (3) to support regional-scale modeling and upscaling of surface fluxes to continental scales, and (4) to quantify land-atmosphere coupling and validate its representation in Earth system models. Adding a suite of atmospheric boundary layer measurements to eddy covariance flux tower sites, and supporting the sharing of these data to tower networks, would allow the Earth science community to address new emerging research questions, better interpret ongoing flux tower measurements, and would present novel opportunities for collaborations between FLUXNET scientists and atmospheric and remote sensing scientists.

Published
2021

27. Interpretability of negative latent heat fluxes from eddy covariance measurements in dry conditions

Author

Paulus, Sinikka J., primary, Orth, Rene, additional, Lee, Sung-Ching, additional, Hildebrandt, Anke, additional, Jung, Martin, additional, Nelson, Jacob A., additional, El-Madany, Tarek Sebastian, additional, Carrara, Arnaud, additional, Moreno, Gerardo, additional, Mauder, Matthias, additional, Groh, Jannis, additional, Graf, Alexander, additional, Reichstein, Markus, additional, and Migliavacca, Mirco, additional

Published
2024
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31. Connecting Land–Atmosphere Interactions to Surface Heterogeneity in CHEESEHEAD19

Author

Butterworth, Brian J., Desai, Ankur R., Metzger, Stefan, Townsend, Philip A., Schwartz, Mark D., Petty, Grant W., Mauder, Matthias, Vogelmann, Hannes, Andresen, Christian G., Augustine, Travis J., Bertram, Timothy H., Brown, William O. J., Buban, Michael, Cleary, Patricia, Durden, David J., Florian, Christopher R., Iglinski, Trevor J., Kruger, Eric L., Lantz, Kathleen, Lee, Temple R., Meyers, Tilden P., Mineau, James K., Olson, Erik R., Oncley, Steven P., Paleri, Sreenath, Pertzborn, Rosalyn A., Pettersen, Claire, Plummer, David M., Riihimaki, Laura D., Guzman, Eliceo Ruiz, Sedlar, Joseph, Smith, Elizabeth N., Speidel, Johannes, Stoy, Paul C., Sühring, Matthias, Thom, Jonathan E., Turner, David D., Vermeuel, Michael P., Wagner, Timothy J., Wang, Zhien, Wanner, Luise, White, Loren D., Wilczak, James M., Wright, Daniel B., and Zheng, Ting

Published
2021

32. Towards long-term standardised carbon and greenhouse gas observations for monitoring Europe’s terrestrial ecosystems: a review

Author

Franz, Daniela, Acosta, Manuel, Altimir, Núria, Arriga, Nicola, Arrouays, Dominique, Aubinet, Marc, Aurela, Mika, Ayres, Edward, López-Ballesteros, Ana, Barbaste, Mireille, Berveiller, Daniel, Biraud, Sébastien, Boukir, Hakima, Brown, Timothy, Brümmer, Christian, Buchmann, Nina, Burba, George, Carrara, Arnaud, Cescatti, Allessandro, Ceschia, Eric, Clement, Robert, Cremonese, Edoardo, Crill, Patrick, Darenova, Eva, Dengel, Sigrid, D’Odorico, Petra, Filippa, Gianluca, Fleck, Stefan, Fratini, Gerardo, Fuß, Roland, Gielen, Bert, Gogo, Sébastien, Grace, John, Graf, Alexander, Grelle, Achim, Gross, Patrick, Grünwald, Thomas, Haapanala, Sami, Hehn, Markus, Heinesch, Bernard, Heiskanen, Jouni, Herbst, Mathias, Herschlein, Christine, Hörtnagl, Lukas, Hufkens, Koen, Ibrom, Andreas, Jolivet, Claudy, Joly, Lilian, Jones, Michael, Kiese, Ralf, Klemedtsson, Leif, Kljun, Natascha, Klumpp, Katja, Kolari, Pasi, Kolle, Olaf, Kowalski, Andrew, Kutsch, Werner, Laurila, Tuomas, de Ligne, Anne, Linder, Sune, Lindroth, Anders, Lohila, Annalea, Longdoz, Bernhard, Mammarella, Ivan, Manise, Tanguy, Jiménez, Sara Maraňón, Matteucci, Giorgio, Mauder, Matthias, Meier, Philip, Merbold, Lutz, Mereu, Simone, Metzger, Stefan, Migliavacca, Mirco, Mölder, Meelis, Montagnani, Leonardo, Moureaux, Christine, Nelson, David, Nemitz, Eiko, Nicolini, Giacomo, Nilsson, Mats B, de Beeck, Maarten Op, Osborne, Bruce, Löfvenius, Mikaell Ottosson, Pavelka, Marian, Peichl, Matthias, Peltola, Olli, Pihlatie, Mari, Pitacco, Andrea, Pokorný, Radek, Pumpanen, Jukka, Ratié, Céline, Rebmann, Corinna, Roland, Marilyn, Sabbatini, Simone, Saby, Nicolas PA, Saunders, Matthew, Schmid, Hans Peter, Schrumpf, Marion, Sedlák, Pavel, and Ortiz, Penelope Serrano

Subjects
Agriculture, Land and Farm Management, Agricultural, Veterinary and Food Sciences, Climate Action, ICOS, GHG exchange, carbon cycle, standardised monitoring, observational network, Agronomy & Agriculture, Agriculture, land and farm management
Abstract

Research infrastructures play a key role in launching a new generation of integrated long-Term, geographically distributed observation programmes designed to monitor climate change, better understand its impacts on global ecosystems, and evaluate possible mitigation and adaptation strategies. The pan-European Integrated Carbon Observation System combines carbon and greenhouse gas (GHG; CO 2 , CH 4 , N 2 O, H 2 O) observations within the atmosphere, terrestrial ecosystems and oceans. High-precision measurements are obtained using standardised methodologies, are centrally processed and openly available in a traceable and verifiable fashion in combination with detailed metadata. The Integrated Carbon Observation System ecosystem station network aims to sample climate and land-cover variability across Europe. In addition to GHG flux measurements, a large set of complementary data (including management practices, vegetation and soil characteristics) is collected to support the interpretation, spatial upscaling and modelling of observed ecosystem carbon and GHG dynamics. The applied sampling design was developed and formulated in protocols by the scientific community, representing a trade-off between an ideal dataset and practical feasibility. The use of open-Access, high-quality and multi-level data products by different user communities is crucial for the Integrated Carbon Observation System in order to achieve its scientific potential and societal value.

Published
2018

33. Effect of Surface Heterogeneity on the Boundary-Layer Height: A Case Study at a Semi-Arid Forest

Author

Brugger, Peter, Banerjee, Tirtha, De Roo, Frederik, Kröniger, Konstantin, Qubaja, Rafat, Rohatyn, Shani, Rotenberg, Eyal, Tatarinov, Feodor, Yakir, Dan, Yang, Fulin, and Mauder, Matthias

Subjects
Boundary-layer height, Forests, Surface heterogeneity, Internal boundary layer, Lidar, Atmospheric Sciences, Meteorology & Atmospheric Sciences
Abstract

We investigate the effects of an isolated meso-γ-scale surface heterogeneity for roughness and albedo on the atmospheric boundary-layer (ABL) height, with a case study at a semi-arid forest surrounded by sparse shrubland (forest area: 28km2, forest length in the main wind direction: 7 km). Doppler lidar and ceilometer measurements at this semi-arid forest show an increase in the ABL height over the forest compared with the shrubland on four out of eight days. The differences in the ABL height between shrubland and forest are explained for all days with a model that assumes a linear growth of the internal boundary layer of the forest through the convective ABL upwind of the forest followed by a square-root growth into the stable free atmosphere. For the environmental conditions that existed during our measurements, the increase in ABL height due to large sensible heat fluxes from the forest (600Wm-2 in summer) is subdued by stable stratification in the free atmosphere above the ABL, or reduced by high wind speeds in the mixed layer.

Published
2018

39. Altered energy partitioning across terrestrial ecosystems in the European drought year 2018

Author

Graf, Alexander, Klosterhalfen, Anne, Arriga, Nicola, Bernhofer, Christian, Bogena, Heye, Bornet, Frédéric, Brüggemann, Nicolas, Brümmer, Christian, Buchmann, Nina, Chi, Jinshu, Chipeaux, Christophe, Cremonese, Edoardo, Cuntz, Matthias, Dušek, Jiří, El-Madany, Tarek S., Fares, Silvano, Fischer, Milan, Foltýnová, Lenka, Gharun, Mana, Ghiasi, Shiva, Gielen, Bert, Gottschalk, Pia, Grünwald, Thomas, Heinemann, Günther, Heinesch, Bernard, Heliasz, Michal, Holst, Jutta, Hörtnagl, Lukas, Ibrom, Andreas, Ingwersen, Joachim, Jurasinski, Gerald, Klatt, Janina, Knohl, Alexander, Koebsch, Franziska, Konopka, Jan, Korkiakoski, Mika, Kowalska, Natalia, Kremer, Pascal, Kruijt, Bart, Lafont, Sebastien, Léonard, Joël, De Ligne, Anne, Longdoz, Bernard, Loustau, Denis, Magliulo, Vincenzo, Mammarella, Ivan, Manca, Giovanni, Mauder, Matthias, Migliavacca, Mirco, Mölder, Meelis, Neirynck, Johan, Ney, Patrizia, Nilsson, Mats, Paul-Limoges, Eugénie, Peichl, Matthias, Pitacco, Andrea, Poyda, Arne, Rebmann, Corinna, Roland, Marilyn, Sachs, Torsten, Schmidt, Marius, Schrader, Frederik, Siebicke, Lukas, Šigut, Ladislav, Tuittila, Eeva-Stiina, Varlagin, Andrej, Vendrame, Nadia, Vincke, Caroline, Völksch, Ingo, Weber, Stephan, Wille, Christian, Wizemann, Hans-Dieter, Zeeman, Matthias, and Vereecken, Harry

Published
2020

45. Interpretability of negative latent heat fluxes from Eddy Covariance measurements during dry conditions

Author

Paulus, Sinikka J., primary, Orth, Rene, additional, Lee, Sung-Ching, additional, Hildebrandt, Anke, additional, Jung, Martin, additional, Nelson, Jacob A., additional, El-Madany, Tarek S., additional, Carrara, Arnaud, additional, Moreno, Gerardo, additional, Mauder, Matthias, additional, Groh, Jannis, additional, Graf, Alexander, additional, Reichstein, Markus, additional, and Migliavacca, Mirco, additional

Published
2023
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46. Commentaries on Top-Cited Boundary-Layer Meteorology Articles

Author

Garratt, John, Wilczak, James, Holtslag, Albert, Schmid, Hans Peter, Grachev, Andrey, Beljaars, Anton, Foken, Thomas, Chen, Fei, Fairall, Christopher, Hicks, Bruce, Kusaka, Hiroyuki, Martilli, Alberto, Masson, Valéry, Mauder, Matthias, Oncley, Steven, Rotach, Mathias, and Tjernström, Michael

Published
2020
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