Articles | Volume 17, issue 24
https://doi.org/10.5194/bg-17-6423-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-17-6423-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
21 Dec 2020
Research article |
| 21 Dec 2020
| 21 Dec 2020
Decoupling of a Douglas fir canopy: a look into the subcanopy with continuous vertical temperature profiles
Bart Schilperoort
CORRESPONDING AUTHOR
Water Management, Delft University of Technology, Stevinweg 1, 2628 CN Delft, the Netherlands
Miriam Coenders-Gerrits
Water Management, Delft University of Technology, Stevinweg 1, 2628 CN Delft, the Netherlands
César Jiménez Rodríguez
Water Management, Delft University of Technology, Stevinweg 1, 2628 CN Delft, the Netherlands
Escuela de Ingeniería Forestal, Tecnológico de Costa Rica, 159-7050, Cartago, Costa Rica
Christiaan van der Tol
Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, Hengelosestraat 99, 7514 AE Enschede, the Netherlands
Bas van de Wiel
Geoscience & Remote Sensing, Delft University of Technology, Stevinweg 1, 2628 CN Delft, the Netherlands
Hubert Savenije
Water Management, Delft University of Technology, Stevinweg 1, 2628 CN Delft, the Netherlands
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Henry Zimba, Miriam Coenders-Gerrits, Kawawa Banda, Petra Hulsman, Nick van de Giesen, Imasiku Nyambe, and Hubert Savenije
Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2022-114, https://doi.org/10.5194/hess-2022-114, 2022
Manuscript not accepted for further review
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Alby Duarte Rocha, Stenka Vulova, Christiaan van der Tol, Michael Förster, and Birgit Kleinschmit
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P. E. K. Campbell, K. F. Huemmrich, E. M. Middleton, J. Alfieri, C. van der Tol, and C. S. R. Neigh
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLVI-1-W1-2021, 1–8, https://doi.org/10.5194/isprs-archives-XLVI-1-W1-2021-1-2022, https://doi.org/10.5194/isprs-archives-XLVI-1-W1-2021-1-2022, 2022
Hubert T. Samboko, Sten Schurer, Hubert H. G. Savenije, Hodson Makurira, Kawawa Banda, and Hessel Winsemius
Geosci. Instrum. Method. Data Syst., 11, 1–23, https://doi.org/10.5194/gi-11-1-2022, https://doi.org/10.5194/gi-11-1-2022, 2022
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Vassilis Aschonitis, Dimos Touloumidis, Marie-Claire ten Veldhuis, and Miriam Coenders-Gerrits
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Hydrol. Earth Syst. Sci., 25, 4887–4915, https://doi.org/10.5194/hess-25-4887-2021, https://doi.org/10.5194/hess-25-4887-2021, 2021
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Peiqi Yang, Egor Prikaziuk, Wout Verhoef, and Christiaan van der Tol
Geosci. Model Dev., 14, 4697–4712, https://doi.org/10.5194/gmd-14-4697-2021, https://doi.org/10.5194/gmd-14-4697-2021, 2021
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Jan G. Hofste, Rogier van der Velde, Jun Wen, Xin Wang, Zuoliang Wang, Donghai Zheng, Christiaan van der Tol, and Zhongbo Su
Earth Syst. Sci. Data, 13, 2819–2856, https://doi.org/10.5194/essd-13-2819-2021, https://doi.org/10.5194/essd-13-2819-2021, 2021
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The dataset reported in this paper concerns the measurement of microwave reflections from an alpine meadow over the Tibetan Plateau. These microwave reflections were measured continuously over 1 year. With it, variations in soil water content due to evaporation, precipitation, drainage, and soil freezing/thawing can be seen. A better understanding of the effects aforementioned processes have on microwave reflections may improve methods for estimating soil water content used by satellites.
Rafael Poyatos, Víctor Granda, Víctor Flo, Mark A. Adams, Balázs Adorján, David Aguadé, Marcos P. M. Aidar, Scott Allen, M. Susana Alvarado-Barrientos, Kristina J. Anderson-Teixeira, Luiza Maria Aparecido, M. Altaf Arain, Ismael Aranda, Heidi Asbjornsen, Robert Baxter, Eric Beamesderfer, Z. Carter Berry, Daniel Berveiller, Bethany Blakely, Johnny Boggs, Gil Bohrer, Paul V. Bolstad, Damien Bonal, Rosvel Bracho, Patricia Brito, Jason Brodeur, Fernando Casanoves, Jérôme Chave, Hui Chen, Cesar Cisneros, Kenneth Clark, Edoardo Cremonese, Hongzhong Dang, Jorge S. David, Teresa S. David, Nicolas Delpierre, Ankur R. Desai, Frederic C. Do, Michal Dohnal, Jean-Christophe Domec, Sebinasi Dzikiti, Colin Edgar, Rebekka Eichstaedt, Tarek S. El-Madany, Jan Elbers, Cleiton B. Eller, Eugénie S. Euskirchen, Brent Ewers, Patrick Fonti, Alicia Forner, David I. Forrester, Helber C. Freitas, Marta Galvagno, Omar Garcia-Tejera, Chandra Prasad Ghimire, Teresa E. Gimeno, John Grace, André Granier, Anne Griebel, Yan Guangyu, Mark B. Gush, Paul J. Hanson, Niles J. Hasselquist, Ingo Heinrich, Virginia Hernandez-Santana, Valentine Herrmann, Teemu Hölttä, Friso Holwerda, James Irvine, Supat Isarangkool Na Ayutthaya, Paul G. Jarvis, Hubert Jochheim, Carlos A. Joly, Julia Kaplick, Hyun Seok Kim, Leif Klemedtsson, Heather Kropp, Fredrik Lagergren, Patrick Lane, Petra Lang, Andrei Lapenas, Víctor Lechuga, Minsu Lee, Christoph Leuschner, Jean-Marc Limousin, Juan Carlos Linares, Maj-Lena Linderson, Anders Lindroth, Pilar Llorens, Álvaro López-Bernal, Michael M. Loranty, Dietmar Lüttschwager, Cate Macinnis-Ng, Isabelle Maréchaux, Timothy A. Martin, Ashley Matheny, Nate McDowell, Sean McMahon, Patrick Meir, Ilona Mészáros, Mirco Migliavacca, Patrick Mitchell, Meelis Mölder, Leonardo Montagnani, Georgianne W. Moore, Ryogo Nakada, Furong Niu, Rachael H. Nolan, Richard Norby, Kimberly Novick, Walter Oberhuber, Nikolaus Obojes, A. Christopher Oishi, Rafael S. Oliveira, Ram Oren, Jean-Marc Ourcival, Teemu Paljakka, Oscar Perez-Priego, Pablo L. Peri, Richard L. Peters, Sebastian Pfautsch, William T. Pockman, Yakir Preisler, Katherine Rascher, George Robinson, Humberto Rocha, Alain Rocheteau, Alexander Röll, Bruno H. P. Rosado, Lucy Rowland, Alexey V. Rubtsov, Santiago Sabaté, Yann Salmon, Roberto L. Salomón, Elisenda Sánchez-Costa, Karina V. R. Schäfer, Bernhard Schuldt, Alexandr Shashkin, Clément Stahl, Marko Stojanović, Juan Carlos Suárez, Ge Sun, Justyna Szatniewska, Fyodor Tatarinov, Miroslav Tesař, Frank M. Thomas, Pantana Tor-ngern, Josef Urban, Fernando Valladares, Christiaan van der Tol, Ilja van Meerveld, Andrej Varlagin, Holm Voigt, Jeffrey Warren, Christiane Werner, Willy Werner, Gerhard Wieser, Lisa Wingate, Stan Wullschleger, Koong Yi, Roman Zweifel, Kathy Steppe, Maurizio Mencuccini, and Jordi Martínez-Vilalta
Earth Syst. Sci. Data, 13, 2607–2649, https://doi.org/10.5194/essd-13-2607-2021, https://doi.org/10.5194/essd-13-2607-2021, 2021
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Transpiration is a key component of global water balance, but it is poorly constrained from available observations. We present SAPFLUXNET, the first global database of tree-level transpiration from sap flow measurements, containing 202 datasets and covering a wide range of ecological conditions. SAPFLUXNET and its accompanying R software package
sapfluxnetrwill facilitate new data syntheses on the ecological factors driving water use and drought responses of trees and forests.
Hongkai Gao, Chuntan Han, Rensheng Chen, Zijing Feng, Kang Wang, Fabrizio Fenicia, and Hubert Savenije
Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2021-264, https://doi.org/10.5194/hess-2021-264, 2021
Manuscript not accepted for further review
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Permafrost hydrology is one of the 23 major unsolved problems in hydrology. In this study, we used a stepwise modeling and dynamic parameter method to examine the impact of permafrost on streamflow in the Hulu catchment in western China. We found that: topography and landscape are dominant controls on catchment response; baseflow recession is slower than other regions; precipitation-runoff relationship is non-stationary; permafrost impacts on streamflow mostly at the beginning of melting season.
Yunfei Wang, Yijian Zeng, Lianyu Yu, Peiqi Yang, Christiaan Van der Tol, Qiang Yu, Xiaoliang Lü, Huanjie Cai, and Zhongbo Su
Geosci. Model Dev., 14, 1379–1407, https://doi.org/10.5194/gmd-14-1379-2021, https://doi.org/10.5194/gmd-14-1379-2021, 2021
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This study integrates photosynthesis and transfer of energy, mass, and momentum in the soil–plant–atmosphere continuum system, via a simplified 1D root growth model. The results indicated that the simulation of land surface fluxes was significantly improved by considering the root water uptake, especially when vegetation was experiencing severe water stress. This finding highlights the importance of enhanced soil heat and moisture transfer in simulating ecosystem functioning.
Laurène J. E. Bouaziz, Fabrizio Fenicia, Guillaume Thirel, Tanja de Boer-Euser, Joost Buitink, Claudia C. Brauer, Jan De Niel, Benjamin J. Dewals, Gilles Drogue, Benjamin Grelier, Lieke A. Melsen, Sotirios Moustakas, Jiri Nossent, Fernando Pereira, Eric Sprokkereef, Jasper Stam, Albrecht H. Weerts, Patrick Willems, Hubert H. G. Savenije, and Markus Hrachowitz
Hydrol. Earth Syst. Sci., 25, 1069–1095, https://doi.org/10.5194/hess-25-1069-2021, https://doi.org/10.5194/hess-25-1069-2021, 2021
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We quantify the differences in internal states and fluxes of 12 process-based models with similar streamflow performance and assess their plausibility using remotely sensed estimates of evaporation, snow cover, soil moisture and total storage anomalies. The dissimilarities in internal process representation imply that these models cannot all simultaneously be close to reality. Therefore, we invite modelers to evaluate their models using multiple variables and to rely on multi-model studies.
Petra Hulsman, Hubert H. G. Savenije, and Markus Hrachowitz
Hydrol. Earth Syst. Sci., 25, 957–982, https://doi.org/10.5194/hess-25-957-2021, https://doi.org/10.5194/hess-25-957-2021, 2021
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Satellite observations have increasingly been used for model calibration, while model structural developments largely rely on discharge data. For large river basins, this often results in poor representations of system internal processes. This study explores the combined use of satellite-based evaporation and total water storage data for model structural improvement and spatial–temporal model calibration for a large, semi-arid and data-scarce river system.
César Dionisio Jiménez-Rodríguez, Miriam Coenders-Gerrits, Bart Schilperoort, Adriana del Pilar González-Angarita, and Hubert Savenije
Hydrol. Earth Syst. Sci., 25, 619–635, https://doi.org/10.5194/hess-25-619-2021, https://doi.org/10.5194/hess-25-619-2021, 2021
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During rainfall events, evaporation from tropical forests is usually ignored. However, the water retained in the canopy during rainfall increases the evaporation despite the high-humidity conditions. In a tropical wet forest in Costa Rica, it was possible to depict vapor plumes rising from the forest canopy during rainfall. These plumes are evidence of forest evaporation. Also, we identified the conditions that allowed this phenomenon to happen using time-lapse videos and meteorological data.
Peiqi Yang, Christiaan van der Tol, Petya K. E. Campbell, and Elizabeth M. Middleton
Biogeosciences, 18, 441–465, https://doi.org/10.5194/bg-18-441-2021, https://doi.org/10.5194/bg-18-441-2021, 2021
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Solar-induced chlorophyll fluorescence (SIF) has the potential to facilitate the monitoring of photosynthesis from space. This study presents a systematic analysis of the physical and physiological meaning of the relationship between fluorescence and photosynthesis at both leaf and canopy levels. We unravel the individual effects of incoming light, vegetation structure and leaf physiology and highlight their joint effects on the relationship between canopy fluorescence and photosynthesis.
Justus G. V. van Ramshorst, Miriam Coenders-Gerrits, Bart Schilperoort, Bas J. H. van de Wiel, Jonathan G. Izett, John S. Selker, Chad W. Higgins, Hubert H. G. Savenije, and Nick C. van de Giesen
Atmos. Meas. Tech., 13, 5423–5439, https://doi.org/10.5194/amt-13-5423-2020, https://doi.org/10.5194/amt-13-5423-2020, 2020
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In this work we present experimental results of a novel actively heated fiber-optic (AHFO) observational wind-probing technique. We utilized a controlled wind-tunnel setup to assess both the accuracy and precision of AHFO under a range of operational conditions (wind speed, angles of attack and temperature differences). AHFO has the potential to provide high-resolution distributed observations of wind speeds, allowing for better spatial characterization of fine-scale processes.
D. Alex R. Gordon, Miriam Coenders-Gerrits, Brent A. Sellers, S. M. Moein Sadeghi, and John T. Van Stan II
Hydrol. Earth Syst. Sci., 24, 4587–4599, https://doi.org/10.5194/hess-24-4587-2020, https://doi.org/10.5194/hess-24-4587-2020, 2020
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Where plants exist, rain must pass through canopies to reach soils. We studied how rain interacts with dogfennel – a highly problematic weed that is abundant in pastures, grasslands, rangelands, urban forests and along highways. Dogfennels evaporated large portions (approx. one-fifth) of rain and drained significant (at times > 25 %) rain (and dew) down their stems to their roots (via stemflow). This may explain how dogfennel survives and even invades managed landscapes during extended droughts.
Cited articles
Alekseychik, P., Mammarella, I., Launiainen, S., Rannik, Ü., and Vesala,
T.: Evolution of the nocturnal decoupled layer in a pine forest canopy,
Agr. Forest Meteorol., 174–175, 15–27,
https://doi.org/10.1016/j.agrformet.2013.01.011,
2013. a, b, c, d
Aubinet, M., Feigenwinter, C., Heinesch, B., Laffineur, Q., Papale, D.,
Reichstein, M., Rinne, J., and van Gorsel, E.: Nighttime Flux Correction,
in: Eddy Covariance: A Practical Guide to Measurement and DataAnalysis,
edited by: Aubinet, M., Vesala, T., and Papale, D., 133–157, Springer,
Dordrecht/Heidelberg/London/New York, 2012. a
Baldocchi, D. D. and Meyers, T. P.: Turbulence structure in a deciduous
forest, Bound.-Lay. Meteorol., 43, 345–364, https://doi.org/10.1007/BF00121712,
1988. a
Barr, A. G., King, K. M., Gillespie, T. J., Den Hartog, G., and Neumann,
H. H.: A comparison of bowen ratio and eddy correlation sensible and latent
heat flux measurements above deciduous forest, Bound.-Lay. Meteorol.,
71, 21–41, https://doi.org/10.1007/BF00709218, 1994. a
Barr, A. G., Richardson, A. D., Hollinger, D. Y., Papale, D., Arain, M. A.,
Black, T. A., Bohrer, G., Dragoni, D., Fischer, M. L., Gu, L., Law, B. E.,
Margolis, H. A., Mccaughey, J. H., Munger, J. W., Oechel, W., and Schaeffer,
K.: Use of change-point detection for friction-velocity threshold evaluation
in eddy-covariance studies, Agr. Forest Meteorol., 171–172,
31–45, https://doi.org/10.1016/j.agrformet.2012.11.023, 2013. a, b, c, d
Cava, D. and Katul, G. G.: The Effects of Thermal Stratification on Clustering
Properties of Canopy Turbulence, Bound.-Lay. Meteorol., 130, 307–325,
https://doi.org/10.1007/s10546-008-9342-6,
2009. a
Cisneros Vaca, C., Ghimire, C. P., and van der Tol, C.: Spatial Patterns and
Temporal Stability of Throughfall in a Mature Douglas-fir Forest, Water, 10, 317,
https://doi.org/10.3390/w10030317,
2018a. a
Cisneros Vaca, C., van der Tol, C., and Ghimire, C. P.: The influence of long-term changes in canopy structure on rainfall interception loss: a case study in Speulderbos, the Netherlands, Hydrol. Earth Syst. Sci., 22, 3701–3719, https://doi.org/10.5194/hess-22-3701-2018, 2018b. a, b, c
Denmead, O. T. and Bradley, E. F.: Flux-Gradient Relationships in a Forest
Canopy, in: The Forest-Atmosphere Interaction, edited by: Hutchison, B. and
Hicks, B., 421–442, Springer Netherlands, Dordrecht,
https://doi.org/10.1007/978-94-009-5305-5_27,
1985. a
des Tombe, B., Schilperoort, B., and Bakker, M.: Estimation of Temperature and
Associated Uncertainty from Fiber-Optic Raman-Spectrum Distributed
Temperature Sensing, Sensors, 20, 2235, https://doi.org/10.3390/s20082235,
2020. a
des Tombe, B. F. and Schilperoort, B.: Python distributed temperature sensing
calibration, Zenodo, https://doi.org/10.5281/zenodo.3531558, 2019. a
des Tombe, B. F., Bakker, M., Schaars, F., and van der Made, K. J.: Estimating
Travel Time in Bank Filtration Systems from a Numerical Model Based on DTS
Measurements, Groundwater, 56, 288–299, https://doi.org/10.1111/gwat.12581, 2018. a
Douglas, G. C., Pliura, A., Dufour, J., Mertens, P., Jacques, D.,
Fernandez-Manjares, J., Buiteveld, J., Parnuta, G., Tudoroiu, M., Curnel, Y.,
Thomasset, M., Jensen, V., Knudsen, M. A., Foffová, E., Chandelier, A.,
and Steenackers, M.: Common Ash (Fraxinus excelsior L.), in: Forest tree
breeding in Europe: Current state-of-the-art and perspectives, edited by:
Pâques, L. E., 403–462, Springer Netherlands, Dordrecht,
https://doi.org/10.1007/978-94-007-6146-9_9,
2013. a
Fitzjarrald, D. R. and Moore, K. E.: Mechanisms of nocturnal exchange between
the rain forest and the atmosphere, J. Geophys. Res., 95,
16839, https://doi.org/10.1029/JD095iD10p16839,
1990. a, b
Foken, T., Godecke, M., Mauder, M., Mahrt, L., Amiro, B., and Munger, J.:
Post-field quality control, in: Handbook of micrometeorology: A guide for
surface flux measurements, edited by: Lee, X., 81–108, Kluwer Academic,
Dordrecht, 2004. a
Frazer, G. W., Canham, C., and Lertzman, K.: Gap Light Analyzer (GLA), Version
2.0: Imaging software to extract canopy structure and gap light transmission
indices from true-colour fisheye photographs, users manual and program
documentation, Simon Fraser University, Burnaby, British Columbia, and the
Institute of Ecosystem Studies, Millbrook, New York, 1999. a
Gao, W., Shaw, R. H., and Paw U, K. T.: Observation of organized structure
in turbulent flow within and above a forest canopy, Bound.-Lay.
Meteorol., 47, 349–377, https://doi.org/10.1007/BF00122339,
1989. a
Göckede, M., Thomas, C., Markkanen, T., Mauder, M., Ruppert, J., and
Foken, T.: Sensitivity of Lagrangian Stochastic footprints to turbulence
statistics, Tellus B, 59,
577–586, https://doi.org/10.1111/j.1600-0889.2007.00275.x, 2007. a
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, Glob. Change Biol., 2, 169–182,
https://doi.org/10.1111/j.1365-2486.1996.tb00070.x,
1996. a
Hilgersom, K., van Emmerik, T., Solcerova, A., Berghuijs, W., Selker, J., and van de Giesen, N.: Practical considerations for enhanced-resolution coil-wrapped distributed temperature sensing, Geosci. Instrum. Method. Data Syst., 5, 151–162, https://doi.org/10.5194/gi-5-151-2016, 2016. a, b
Izett, J. G., Schilperoort, B., Coenders-Gerrits, M., Baas, P., Bosveld, F. C.,
and van de Wiel, B. J. H.: Missed Fog?, Bound.-Lay. Meteorol., 173,
289–309, https://doi.org/10.1007/s10546-019-00462-3,
2019. a, b
Jiménez-Rodríguez, C. D., Coenders-Gerrits, M., Schilperoort, B., González-Angarita, A., and Savenije, H.: Vapor plumes in a tropical wet forest: spotting the invisible evaporation, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2020-14, in review, 2020. a, b
Jocher, G., Ottosson Löfvenius, M., De Simon, G., Hörnlund, T.,
Linder, S., Lundmark, T., Marshall, J., Nilsson, M. B., Näsholm, T.,
Tarvainen, L., Öquist, M., and Peichl, M.: Apparent winter CO2 uptake
by a boreal forest due to decoupling, Agr. Forest Meteorol.,
232, 23–34, https://doi.org/10.1016/j.agrformet.2016.08.002,
2017. a, b, c, d
Jocher, G., Marshall, J., Nilsson, M. B., Linder, S., De Simon, G.,
Hörnlund, T., Lundmark, T., Näsholm, T., Ottosson
Löfvenius, M., Tarvainen, L., Wallin, G., and Peichl, M.: Impact of
Canopy Decoupling and Subcanopy Advection on the Annual Carbon Balance of a
Boreal Scots Pine Forest as Derived From Eddy Covariance, J.
Geophys. Res.-Biogeosci., 123, 303–325,
https://doi.org/10.1002/2017JG003988, 2018. a
Jocher, G., Fischer, M., Šigut, L., Pavelka, M., Sedlák, P., and
Katul, G.: Assessing decoupling of above and below canopy air masses at a
Norway spruce stand in complex terrain, Agr. Forest Meteorol.,
294, 108149, https://doi.org/10.1016/j.agrformet.2020.108149,
2020. a, b, c
Kaimal, J. C. and Finnigan, J. J.: Atmospheric boundary layer flows: their
structure and measurement, Oxford University Press, New York, 1994. a
Katul, G., Goltz, S. M., Hsieh, C. I., Cheng, Y., Mowry, F., and Sigmon, J.:
Estimation of surface heat and momentum fluxes using the flux-variance
method above uniform and non-uniform terrain, Bound.-Lay. Meteorol.,
74, 237–260, https://doi.org/10.1007/BF00712120, 1995. a
Lapo, K., Freundorfer, A., Pfister, L., Schneider, J., Selker, J., and Thomas, C.: Distributed observations of wind direction using microstructures attached to actively heated fiber-optic cables, Atmos. Meas. Tech., 13, 1563–1573, https://doi.org/10.5194/amt-13-1563-2020, 2020. a
Launiainen, S., Vesala, T., MöLder, M., Mammarella, I., Smolander, S.,
Rannik, Ü., Kolari, P., Hari, P., Lindroth, A., and Katul, G.:
Vertical variability and effect of stability on turbulence characteristics
down to the floor of a pine forest, Tellus B, 59, 919–936, https://doi.org/10.1111/j.1600-0889.2007.00313.x,
2007. a
LI-COR Inc.: EddyPro® Version 6.2 [Computer Software],
2016. a
Monna, W. and Bosveld, F.: In higher spheres: 40 years of observations at the
Cabauw Site, Royal Netherlands Meteorological Institute, De Bilt, 2013. a
Nadkarni, N., Parker, G., Rinker, H., and Jarzen, D.: The Nature of Forest
Canopies, in: Forest Canopies, edited by Lowman, M. and Rinker, H., chap.
Chapter 1, 3–23, Academic Press, San Diego, 2nd edn., available at:
https://www.elsevier.com/books/forest-canopies/lowman/978-0-12-457553-0 (last access: 18 December 2020),
2004. a
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. a, b
Parker, G.: Structure and Microclimate of Forest Canopies, in: Forest
Canopies, edited by: Lowman, M. and Nadkarni, N., chap. 4,
73–106, Academic Press, San Diego, 1st edn., 1995. a
Patton, E. G., Horst, T. W., Sullivan, P. P., Lenschow, D. H., Oncley, S. P.,
Brown, W. O. J., Burns, S. P., Guenther, A. B., Held, A., Karl, T., Mayor,
S. D., Rizzo, L. V., Spuler, S. M., Sun, J., Turnipseed, A. A., Allwine,
E. J., Edburg, S. L., Lamb, B. K., Avissar, R., Calhoun, R. J., Kleissl, J.,
Massman, W. J., Paw U, K. T., and Weil, J. C.: The Canopy Horizontal Array
Turbulence Study, B. Am. Meteorol. Soc., 92,
593–611, https://doi.org/10.1175/2010BAMS2614.1,
2011. a
Raupach, M. R.: Anomalies in flux-gradient relationships over forest,
Bound.-Lay. Meteorol., 16, 467–486, https://doi.org/10.1007/BF03163564,
1979. a
Sayde, C., Thomas, C. K., Wagner, J., and Selker, J.: High-resolution wind
speed measurements using actively heated fiber optics, Geophys. Res.
Lett., 42, 10064–10073, https://doi.org/10.1002/2015GL066729, 2015. a
Schilperoort, B., Coenders-Gerrits, M., Luxemburg, W., Jiménez Rodríguez, C., Cisneros Vaca, C., and Savenije, H.: Technical note: Using distributed temperature sensing for Bowen ratio evaporation measurements, Hydrol. Earth Syst. Sci., 22, 819–830, https://doi.org/10.5194/hess-22-819-2018, 2018. a, b, c, d
Schilperoort, B., Rodríguez, C. J., and Coenders-Gerrits, M.: Animated DTS temperature profiles Speulderbos forest, Zenodo, https://doi.org/10.5281/zenodo.3048116, 2019. a, b
Schilperoort, B., Jiménez Rodríguez, C., van der Tol, C., Ucer,
M., and Coenders-Gerrits, M.: Speulderbos turbulence and temperature profile
measurements, 4TU research data, https://doi.org/10.4121/uuid:e0a3d8c9-cb3c-4029-bbe8-2b775c0b88ef, 2020. a
Schmid, M., Pautasso, M., and Holdenrieder, O.: Ecological consequences of
Douglas fir (Pseudotsuga menziesii) cultivation in Europe, Eur. J. Forest Res., 133, 13–29, https://doi.org/10.1007/s10342-013-0745-7, 2014. a
Selker, J. S., Thévenaz, L., Huwald, H., Mallet, A., Luxemburg, W., Van
De Giesen, N., Stejskal, M., Zeman, J., Westhoff, M., and Parlange, M. B.:
Distributed fiber-optic temperature sensing for hydrologic systems, Water
Resour. Res., 42, 1–8, https://doi.org/10.1029/2006WR005326, 2006. a, b
Staebler, R. M. and Fitzjarrald, D. R.: Observing subcanopy CO2 advection,
Agr. Forest Meteorol., 122, 139–156,
https://doi.org/10.1016/j.agrformet.2003.09.011, 2004. a
Stafford, B.: pysolar, Zenodo, https://doi.org/10.5281/ZENODO.1461066,
2018. a
Stull, R. B.: An Introduction to Boundary Layer Meteorology, Kluwer Academic
Publishers, Dordrecht, https://doi.org/10.1007/978-94-009-3027-8, 1988. a
Thomas, C. K., Martin, J. G., Law, B. E., and Davis, K.: Toward biologically
meaningful net carbon exchange estimates for tall, dense canopies:
Multi-level eddy covariance observations and canopy coupling regimes in a
mature Douglas-fir forest in Oregon, Agr. Forest Meteorol.,
173, 14–27, https://doi.org/10.1016/j.agrformet.2013.01.001,
2013. a, b
Thomas, C. K., Serafimovich, A., Siebicke, L., Gerken, T., and Foken, T.:
Coherent Structures and Flux Coupling, in: Energy and Matter Fluxes of a
Spruce Forest Ecosystem, 113–135, Springer International Publishing,
https://doi.org/10.1007/978-3-319-49389-3_6,
2017.
a
Thorpe, A. J., Hoskins, B. J., and Innocentini, V.: The parcel method in a
baroclinic atmosphere, J. Atmos. Sci., 46, 1274–1284,
https://doi.org/10.1175/1520-0469(1989)046<1274:TPMIAB>2.0.CO;2, 1989. a
van de Wiel, B. J. H., Vignon, E., Baas, P., van Hooijdonk, I. G. S., van der
Linden, S. J. A., van Hooft, J., Bosveld, F. C., de Roode, S. R., Moene,
A. F., and Genthon, C.: Regime Transitions in Near-Surface Temperature
Inversions: A Conceptual Model, J. Atmos. Sci., 74,
1057–1073, https://doi.org/10.1175/JAS-D-16-0180.1,
2017. a
van Ramshorst, J. G. V., Coenders-Gerrits, M., Schilperoort, B., van de Wiel, B. J. H., Izett, J. G., Selker, J. S., Higgins, C. W., Savenije, H. H. G., and van de Giesen, N. C.: Revisiting wind speed measurements using actively heated fiber optics: a wind tunnel study, Atmos. Meas. Tech., 13, 5423–5439, https://doi.org/10.5194/amt-13-5423-2020, 2020. a
Wilson, K.: Energy balance closure at FLUXNET sites, Agr. Forest
Meteorol., 113, 223–243, https://doi.org/10.1016/S0168-1923(02)00109-0, 2002. a
Winter, S., Höfler, J., Michel, A. K., Böck, A., and Ankerst,
D. P.: Association of tree and plot characteristics with microhabitat
formation in European beech and Douglas-fir forests, Eur. J.
Forest Res., 134, 335–347, https://doi.org/10.1007/s10342-014-0855-x, 2015. a
Short summary
With distributed temperature sensing (DTS) we measured a vertical temperature profile in a forest, from the forest floor to above the treetops. Using this temperature profile we can see which parts of the forest canopy are colder (thus more dense) or warmer (and less dense) and study the effect this has on the suppression of turbulent mixing. This can be used to improve our knowledge of the interaction between the atmosphere and forests and improve carbon dioxide flux measurements over forests.
With distributed temperature sensing (DTS) we measured a vertical temperature profile in a...
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