Articles | Volume 16, issue 2
https://doi.org/10.5194/bg-16-521-2019
© Author(s) 2019. 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-16-521-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
30 Jan 2019
Research article |
| 30 Jan 2019
| 30 Jan 2019
Evaluating multi-year, multi-site data on the energy balance closure of eddy-covariance flux measurements at cropland sites in southwestern Germany
Ravshan Eshonkulov
CORRESPONDING AUTHOR
Institute of Soil Science and Land Evaluation, Biogeophysics,
University of Hohenheim, Emil-Wolff Str. 27, 70593 Stuttgart, Germany
Environmental Protection and Ecology, Karshi Engineering Economic
Institute, Mustakillik Avenue 225, 180100 Karshi, Uzbekistan
Arne Poyda
Institute of Soil Science and Land Evaluation, Biogeophysics,
University of Hohenheim, Emil-Wolff Str. 27, 70593 Stuttgart, Germany
Joachim Ingwersen
Institute of Soil Science and Land Evaluation, Biogeophysics,
University of Hohenheim, Emil-Wolff Str. 27, 70593 Stuttgart, Germany
Hans-Dieter Wizemann
Institute of Physics and Meteorology, Physics and Meteorology,
University of Hohenheim, Garben Str. 30, 70593 Stuttgart, Germany
Tobias K. D. Weber
Institute of Soil Science and Land Evaluation, Biogeophysics,
University of Hohenheim, Emil-Wolff Str. 27, 70593 Stuttgart, Germany
Pascal Kremer
Institute of Soil Science and Land Evaluation, Biogeophysics,
University of Hohenheim, Emil-Wolff Str. 27, 70593 Stuttgart, Germany
Petra Högy
Institute of Landscape and Plant Ecology, Plant Ecology and
Ecotoxicology, University of Hohenheim, August-von-Hartmann-Str. 3, 70593
Stuttgart, Germany
Alim Pulatov
EcoGIS center, Tashkent Institute of Irrigation and Agricultural
Mechanization Engineers, Kary Niyoziy Str.39, 100000 Tashkent, Uzbekistan
Thilo Streck
Institute of Soil Science and Land Evaluation, Biogeophysics,
University of Hohenheim, Emil-Wolff Str. 27, 70593 Stuttgart, Germany
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The mechanisms of soil CO2 flux in dry desert soils are not fully understood. Yet studies conducted in desert ecosystems rarely discuss potential errors related to using the commonly used flux chambers in dry and bare soils. In our study, the conventional deployment practice of the chambers underestimated the instantaneous CO2 flux by up to 50 % and the total daily CO2 uptake by 35 %. This suggests that desert soils are a larger carbon sink than previously reported.
Rosemary J. Eufemio, Ingrid de Almeida Ribeiro, Todd L. Sformo, Gary A. Laursen, Valeria Molinero, Janine Fröhlich-Nowoisky, Mischa Bonn, and Konrad Meister
Biogeosciences, 20, 2805–2812, https://doi.org/10.5194/bg-20-2805-2023, https://doi.org/10.5194/bg-20-2805-2023, 2023
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Lichens, the dominant vegetation in the Arctic, contain ice nucleators (INs) that enable freezing close to 0°C. Yet the abundance, diversity, and function of lichen INs is unknown. Our screening of lichens across Alaska reveal that most species have potent INs. We find that lichens contain two IN populations which retain activity under environmentally relevant conditions. The ubiquity and stability of lichen INs suggest that they may have considerable impacts on local atmospheric patterns.
Doaa Aboelyazeed, Chonggang Xu, Forrest M. Hoffman, Jiangtao Liu, Alex W. Jones, Chris Rackauckas, Kathryn Lawson, and Chaopeng Shen
Biogeosciences, 20, 2671–2692, https://doi.org/10.5194/bg-20-2671-2023, https://doi.org/10.5194/bg-20-2671-2023, 2023
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Photosynthesis is critical for life and has been affected by the changing climate. Many parameters come into play while modeling, but traditional calibration approaches face many issues. Our framework trains coupled neural networks to provide parameters to a photosynthesis model. Using big data, we independently found parameter values that were correlated with those in the literature while giving higher correlation and reduced biases in photosynthesis rates.
Norbert Pirk, Kristoffer Aalstad, Yeliz A. Yilmaz, Astrid Vatne, Andrea L. Popp, Peter Horvath, Anders Bryn, Ane Victoria Vollsnes, Sebastian Westermann, Terje Koren Berntsen, Frode Stordal, and Lena Merete Tallaksen
Biogeosciences, 20, 2031–2047, https://doi.org/10.5194/bg-20-2031-2023, https://doi.org/10.5194/bg-20-2031-2023, 2023
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We measured the land–atmosphere exchange of CO2 and water vapor in alpine Norway over 3 years. The extremely snow-rich conditions in 2020 reduced the total annual evapotranspiration to 50 % and reduced the growing-season carbon assimilation to turn the ecosystem from a moderate annual carbon sink to an even stronger source. Our analysis suggests that snow cover anomalies are driving the most consequential short-term responses in this ecosystem’s functioning.
Hamadou Balde, Gabriel Hmimina, Yves Goulas, Gwendal Latouche, and Kamel Soudani
Biogeosciences, 20, 1473–1490, https://doi.org/10.5194/bg-20-1473-2023, https://doi.org/10.5194/bg-20-1473-2023, 2023
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This study focuses on the relationship between sun-induced chlorophyll fluorescence (SIF) and ecosystem gross primary productivity (GPP) across the ICOS European flux tower network. It shows that SIF, coupled with reflectance observations, explains over 80 % of the GPP variability across diverse ecosystems but fails to bring new information compared to reflectance alone at coarse spatial scales (~5 km). These findings have applications in agriculture and ecophysiological studies.
John T. Walker, Xi Chen, Zhiyong Wu, Donna Schwede, Ryan Daly, Aleksandra Djurkovic, A. Christopher Oishi, Eric Edgerton, Jesse Bash, Jennifer Knoepp, Melissa Puchalski, John Iiames, and Chelcy F. Miniat
Biogeosciences, 20, 971–995, https://doi.org/10.5194/bg-20-971-2023, https://doi.org/10.5194/bg-20-971-2023, 2023
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Better estimates of atmospheric nitrogen (N) deposition are needed to accurately assess ecosystem risk and impacts from deposition of nutrients and acidity. Using measurements and modeling, we estimate total N deposition of 6.7 kg N ha−1 yr−1 at a forest site in the southern Appalachian Mountains, a region sensitive to atmospheric deposition. Reductions in deposition of reduced forms of N (ammonia and ammonium) will be needed to meet the lowest estimates of N critical loads for the region.
Yi-Ying Chen and Sebastiaan Luyssaert
Biogeosciences, 20, 349–363, https://doi.org/10.5194/bg-20-349-2023, https://doi.org/10.5194/bg-20-349-2023, 2023
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Tropical cyclones are typically assumed to be associated with ecosystem damage. This study challenges this assumption and suggests that instead of reducing leaf area, cyclones in East Asia may increase leaf area by alleviating water stress.
Deborah F. McGlynn, Graham Frazier, Laura E. R. Barry, Manuel T. Lerdau, Sally E. Pusede, and Gabriel Isaacman-VanWertz
Biogeosciences, 20, 45–55, https://doi.org/10.5194/bg-20-45-2023, https://doi.org/10.5194/bg-20-45-2023, 2023
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Using a custom-made gas chromatography flame ionization detector, 2 years of speciated hourly biogenic volatile organic compound data were collected in a forest in central Virginia. We identify diurnal and seasonal variability in the data, which is shown to impact atmospheric oxidant budgets. A comparison with emission models identified discrepancies with implications for model outcomes. We suggest increased monitoring of speciated biogenic volatile organic compounds to improve modeled results.
Luke D. Schiferl, Jennifer D. Watts, Erik J. L. Larson, Kyle A. Arndt, Sébastien C. Biraud, Eugénie S. Euskirchen, Jordan P. Goodrich, John M. Henderson, Aram Kalhori, Kathryn McKain, Marikate E. Mountain, J. William Munger, Walter C. Oechel, Colm Sweeney, Yonghong Yi, Donatella Zona, and Róisín Commane
Biogeosciences, 19, 5953–5972, https://doi.org/10.5194/bg-19-5953-2022, https://doi.org/10.5194/bg-19-5953-2022, 2022
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As the Arctic rapidly warms, vast stores of thawing permafrost could release carbon dioxide (CO2) into the atmosphere. We combined observations of atmospheric CO2 concentrations from aircraft and a tower with observed CO2 fluxes from tundra ecosystems and found that the Alaskan North Slope in not a consistent source nor sink of CO2. Our study shows the importance of using both site-level and atmospheric measurements to constrain regional net CO2 fluxes and improve biogenic processes in models.
Pascal Wintjen, Frederik Schrader, Martijn Schaap, Burkhard Beudert, Richard Kranenburg, and Christian Brümmer
Biogeosciences, 19, 5287–5311, https://doi.org/10.5194/bg-19-5287-2022, https://doi.org/10.5194/bg-19-5287-2022, 2022
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For the first time, we compared four methods for estimating the annual dry deposition of total reactive nitrogen into a low-polluted forest ecosystem. In our analysis, we used 2.5 years of flux measurements, an in situ modeling approach, a large-scale chemical transport model (CTM), and canopy budget models. Annual nitrogen dry deposition budgets ranged between 4.3 and 6.7 kg N ha−1 a−1, depending on the applied method.
Michael Staudt, Juliane Daussy, Joseph Ingabire, and Nafissa Dehimeche
Biogeosciences, 19, 4945–4963, https://doi.org/10.5194/bg-19-4945-2022, https://doi.org/10.5194/bg-19-4945-2022, 2022
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We studied the short- and long-term effects of CO2 as a function of temperature on monoterpene emissions from holm oak. Similarly to isoprene, emissions decreased non-linearly with increasing CO2, with no differences among compounds and chemotypes. The CO2 response was modulated by actual leaf and growth temperature but not by growth CO2. Estimates of annual monoterpene release under double CO2 suggest that CO2 inhibition does not offset the increase in emissions due to expected warming.
Brendan Byrne, Junjie Liu, Yonghong Yi, Abhishek Chatterjee, Sourish Basu, Rui Cheng, Russell Doughty, Frédéric Chevallier, Kevin W. Bowman, Nicholas C. Parazoo, David Crisp, Xing Li, Jingfeng Xiao, Stephen Sitch, Bertrand Guenet, Feng Deng, Matthew S. Johnson, Sajeev Philip, Patrick C. McGuire, and Charles E. Miller
Biogeosciences, 19, 4779–4799, https://doi.org/10.5194/bg-19-4779-2022, https://doi.org/10.5194/bg-19-4779-2022, 2022
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Plants draw CO2 from the atmosphere during the growing season, while respiration releases CO2 to the atmosphere throughout the year, driving seasonal variations in atmospheric CO2 that can be observed by satellites, such as the Orbiting Carbon Observatory 2 (OCO-2). Using OCO-2 XCO2 data and space-based constraints on plant growth, we show that permafrost-rich northeast Eurasia has a strong seasonal release of CO2 during the autumn, hinting at an unexpectedly large respiration signal from soils.
Valery A. Isidorov and Andrej A. Zaitsev
Biogeosciences, 19, 4715–4746, https://doi.org/10.5194/bg-19-4715-2022, https://doi.org/10.5194/bg-19-4715-2022, 2022
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Biogenic volatile organic compounds (VOCs) play a critical role in earth-system processes: they are
main playersin the formation of tropospheric O3 and secondary aerosols, which have a significant impact on climate, human health and crops. A complex mixture of VOCs, formed as a result of physicochemical and biological processes, is released into the atmosphere from the forest floor. This review presents data on the composition of VOCs and contribution of various processes to their emissions.
David S. McLagan, Harald Biester, Tomas Navrátil, Stephan M. Kraemer, and Lorenz Schwab
Biogeosciences, 19, 4415–4429, https://doi.org/10.5194/bg-19-4415-2022, https://doi.org/10.5194/bg-19-4415-2022, 2022
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Spruce and larch trees are effective archiving species for historical atmospheric mercury using growth rings of bole wood. Mercury stable isotope analysis proved an effective tool to characterise industrial mercury signals and assess mercury uptake pathways (leaf uptake for both wood and bark) and mercury cycling within the trees. These data detail important information for understanding the mercury biogeochemical cycle particularly in forest systems.
Xin Yu, René Orth, Markus Reichstein, Michael Bahn, Anne Klosterhalfen, Alexander Knohl, Franziska Koebsch, Mirco Migliavacca, Martina Mund, Jacob A. Nelson, Benjamin D. Stocker, Sophia Walther, and Ana Bastos
Biogeosciences, 19, 4315–4329, https://doi.org/10.5194/bg-19-4315-2022, https://doi.org/10.5194/bg-19-4315-2022, 2022
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Identifying drought legacy effects is challenging because they are superimposed on variability driven by climate conditions in the recovery period. We develop a residual-based approach to quantify legacies on gross primary productivity (GPP) from eddy covariance data. The GPP reduction due to legacy effects is comparable to the concurrent effects at two sites in Germany, which reveals the importance of legacy effects. Our novel methodology can be used to quantify drought legacies elsewhere.
Anders Lindroth, Norbert Pirk, Ingibjörg S. Jónsdóttir, Christian Stiegler, Leif Klemedtsson, and Mats B. Nilsson
Biogeosciences, 19, 3921–3934, https://doi.org/10.5194/bg-19-3921-2022, https://doi.org/10.5194/bg-19-3921-2022, 2022
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We measured the fluxes of carbon dioxide and methane between a moist moss tundra and the atmosphere on Svalbard in order to better understand how such ecosystems are affecting the climate and vice versa. We found that the system was a small sink of carbon dioxide and a small source of methane. These fluxes are small in comparison with other tundra ecosystems in the high Arctic. Analysis of temperature sensitivity showed that respiration was more sensitive than photosynthesis above about 6 ℃.
Phillip Papastefanou, Christian S. Zang, Zlatan Angelov, Aline Anderson de Castro, Juan Carlos Jimenez, Luiz Felipe Campos De Rezende, Romina C. Ruscica, Boris Sakschewski, Anna A. Sörensson, Kirsten Thonicke, Carolina Vera, Nicolas Viovy, Celso Von Randow, and Anja Rammig
Biogeosciences, 19, 3843–3861, https://doi.org/10.5194/bg-19-3843-2022, https://doi.org/10.5194/bg-19-3843-2022, 2022
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The Amazon rainforest has been hit by multiple severe drought events. In this study, we assess the severity and spatial extent of the extreme drought years 2005, 2010 and 2015/16 in the Amazon. Using nine different precipitation datasets and three drought indicators we find large differences in drought stress across the Amazon region. We conclude that future studies should use multiple rainfall datasets and drought indicators when estimating the impact of drought stress in the Amazon region.
Haiyang Shi, Geping Luo, Olaf Hellwich, Mingjuan Xie, Chen Zhang, Yu Zhang, Yuangang Wang, Xiuliang Yuan, Xiaofei Ma, Wenqiang Zhang, Alishir Kurban, Philippe De Maeyer, and Tim Van de Voorde
Biogeosciences, 19, 3739–3756, https://doi.org/10.5194/bg-19-3739-2022, https://doi.org/10.5194/bg-19-3739-2022, 2022
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A number of studies have been conducted by using machine learning approaches to simulate carbon fluxes. We performed a meta-analysis of these net ecosystem exchange (NEE) simulations. Random forests and support vector machines performed better than other algorithms. Models with larger timescales had a lower accuracy. For different plant functional types (PFTs), there were significant differences in the predictors used and their effects on model accuracy.
Siqi Li, Wei Zhang, Xunhua Zheng, Yong Li, Shenghui Han, Rui Wang, Kai Wang, Zhisheng Yao, Chunyan Liu, and Chong Zhang
Biogeosciences, 19, 3001–3019, https://doi.org/10.5194/bg-19-3001-2022, https://doi.org/10.5194/bg-19-3001-2022, 2022
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The CNMM–DNDC model was modified to simulate ammonia volatilization (AV) from croplands. AV from cultivated uplands followed the first-order kinetics, which was jointly regulated by the factors of soil properties and meteorological conditions. AV simulation from rice paddy fields was improved by incorporating Jayaweera–Mikkelsen mechanisms. The modified model performed well in simulating the observed cumulative AV measured from 63 fertilization events in China.
Matthias Volk, Matthias Suter, Anne-Lena Wahl, and Seraina Bassin
Biogeosciences, 19, 2921–2937, https://doi.org/10.5194/bg-19-2921-2022, https://doi.org/10.5194/bg-19-2921-2022, 2022
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Because soils are an important sink for greenhouse gasses, we subjected sub-alpine grassland to a six-level climate change treatment.
Two independent methods showed that at warming > 1.5 °C the grassland ecosystem lost ca. 14 % or ca. 1 kg C m−2 in 5 years.
This shrinking of the terrestrial C sink implies a substantial positive feedback to the atmospheric greenhouse effect.
It is likely that this dramatic C loss is a transient effect before a new, climate-adjusted steady state is reached.
Johan A. Eckdahl, Jeppe A. Kristensen, and Daniel B. Metcalfe
Biogeosciences, 19, 2487–2506, https://doi.org/10.5194/bg-19-2487-2022, https://doi.org/10.5194/bg-19-2487-2022, 2022
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This study found climate to be a driving force for increasing per area emissions of greenhouse gases and removal of important nutrients from high-latitude forests due to wildfire. It used detailed direct measurements over a large area to uncover patterns and mechanisms of restructuring of forest carbon and nitrogen pools that are extrapolatable to larger regions. It also takes a step forward in filling gaps in global knowledge of northern forest response to climate-change-strengthened wildfires.
Sparkle L. Malone, Youmi Oh, Kyle A. Arndt, George Burba, Roisin Commane, Alexandra R. Contosta, Jordan P. Goodrich, Henry W. Loescher, Gregory Starr, and Ruth K. Varner
Biogeosciences, 19, 2507–2522, https://doi.org/10.5194/bg-19-2507-2022, https://doi.org/10.5194/bg-19-2507-2022, 2022
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To understand the CH4 flux potential of natural ecosystems and agricultural lands in the United States of America, a multi-scale CH4 observation network focused on CH4 flux rates, processes, and scaling methods is required. This can be achieved with a network of ground-based observations that are distributed based on climatic regions and land cover.
Bruna R. F. Oliveira, Jan J. Keizer, and Thomas Foken
Biogeosciences, 19, 2235–2243, https://doi.org/10.5194/bg-19-2235-2022, https://doi.org/10.5194/bg-19-2235-2022, 2022
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This study analyzes the impacts of this windthrow on the aerodynamic characteristics of zero-plane displacement and roughness length and, ultimately, their implications for the turbulent fluxes. The turbulent fluxes were only affected to a minor degree by the windthrow, but the footprint area of the flux tower changed markedly so that the target area of the measurements had to be redetermined.
Minttu Havu, Liisa Kulmala, Pasi Kolari, Timo Vesala, Anu Riikonen, and Leena Järvi
Biogeosciences, 19, 2121–2143, https://doi.org/10.5194/bg-19-2121-2022, https://doi.org/10.5194/bg-19-2121-2022, 2022
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The carbon sequestration potential of two street tree species and the soil beneath them was quantified with the urban land surface model SUEWS and the soil carbon model Yasso. The street tree plantings turned into a modest sink of carbon from the atmosphere after 14 years. Overall, the results indicate the importance of soil in urban carbon sequestration estimations, as soil respiration exceeded the carbon uptake in the early phase, due to the high initial carbon loss from the soil.
Jarmo Mäkelä, Laila Melkas, Ivan Mammarella, Tuomo Nieminen, Suyog Chandramouli, Rafael Savvides, and Kai Puolamäki
Biogeosciences, 19, 2095–2099, https://doi.org/10.5194/bg-19-2095-2022, https://doi.org/10.5194/bg-19-2095-2022, 2022
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Causal structure discovery algorithms have been making headway into Earth system sciences, and they can be used to increase our understanding on biosphere–atmosphere interactions. In this paper we present a procedure on how to utilize prior knowledge of the domain experts together with these algorithms in order to find more robust causal structure models. We also demonstrate how to avoid pitfalls such as over-fitting and concept drift during this process.
Makoto Saito, Tomohiro Shiraishi, Ryuichi Hirata, Yosuke Niwa, Kazuyuki Saito, Martin Steinbacher, Doug Worthy, and Tsuneo Matsunaga
Biogeosciences, 19, 2059–2078, https://doi.org/10.5194/bg-19-2059-2022, https://doi.org/10.5194/bg-19-2059-2022, 2022
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This study tested combinations of two sources of AGB data and two sources of LCC data and used the same burned area satellite data to estimate BB CO emissions. Our analysis showed large discrepancies in annual mean CO emissions and explicit differences in the simulated CO concentrations among the BB emissions estimates. This study has confirmed that BB emissions estimates are sensitive to the land surface information on which they are based.
Johannes Gensheimer, Alexander J. Turner, Philipp Köhler, Christian Frankenberg, and Jia Chen
Biogeosciences, 19, 1777–1793, https://doi.org/10.5194/bg-19-1777-2022, https://doi.org/10.5194/bg-19-1777-2022, 2022
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We develop a convolutional neural network, named SIFnet, that increases the spatial resolution of SIF from TROPOMI by a factor of 10 to a spatial resolution of 0.005°. SIFnet utilizes coarse SIF observations, together with a broad range of high-resolution auxiliary data. The insights gained from interpretable machine learning techniques allow us to make quantitative claims about the relationships between SIF and other common parameters related to photosynthesis.
Shihan Sun, Amos P. K. Tai, David H. Y. Yung, Anthony Y. H. Wong, Jason A. Ducker, and Christopher D. Holmes
Biogeosciences, 19, 1753–1776, https://doi.org/10.5194/bg-19-1753-2022, https://doi.org/10.5194/bg-19-1753-2022, 2022
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We developed and used a terrestrial biosphere model to compare and evaluate widely used empirical dry deposition schemes with different stomatal approaches and found that using photosynthesis-based stomatal approaches can reduce biases in modeled dry deposition velocities in current chemical transport models. Our study shows systematic errors in current dry deposition schemes and the importance of representing plant ecophysiological processes in models under a changing climate.
Ka Ming Fung, Maria Val Martin, and Amos P. K. Tai
Biogeosciences, 19, 1635–1655, https://doi.org/10.5194/bg-19-1635-2022, https://doi.org/10.5194/bg-19-1635-2022, 2022
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Fertilizer-induced ammonia detrimentally affects the environment by not only directly damaging ecosystems but also indirectly altering climate and soil fertility. To quantify these secondary impacts, we enabled CESM to simulate ammonia emission, chemical evolution, and deposition as a continuous cycle. If synthetic fertilizer use is to soar by 30 % from today's level, we showed that the counteracting impacts will increase the global ammonia emission by 3.3 Tg N per year.
Lena Wohlgemuth, Pasi Rautio, Bernd Ahrends, Alexander Russ, Lars Vesterdal, Peter Waldner, Volkmar Timmermann, Nadine Eickenscheidt, Alfred Fürst, Martin Greve, Peter Roskams, Anne Thimonier, Manuel Nicolas, Anna Kowalska, Morten Ingerslev, Päivi Merilä, Sue Benham, Carmen Iacoban, Günter Hoch, Christine Alewell, and Martin Jiskra
Biogeosciences, 19, 1335–1353, https://doi.org/10.5194/bg-19-1335-2022, https://doi.org/10.5194/bg-19-1335-2022, 2022
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Gaseous mercury is present in the atmosphere all over the globe. During the growing season, plants take up mercury from the air in a similar way as CO2. We investigated which factors impact this vegetational mercury uptake by analyzing a large dataset of leaf mercury uptake rates of trees in Europe. As a result, we conclude that mercury uptake is foremost controlled by tree-intrinsic traits like physiological activity but also by climatic factors like dry conditions in the air and in soils.
Junqi Wei, Xiaoyan Li, Lei Liu, Torben Røjle Christensen, Zhiyun Jiang, Yujun Ma, Xiuchen Wu, Hongyun Yao, and Efrén López-Blanco
Biogeosciences, 19, 861–875, https://doi.org/10.5194/bg-19-861-2022, https://doi.org/10.5194/bg-19-861-2022, 2022
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Although water availability has been linked to the response of ecosystem carbon (C) sink–source to climate warming, the mechanisms by which C uptake responds to soil moisture remain unclear. We explored how soil water and other environmental drivers modulate net C uptake in an alpine swamp meadow. Results reveal that nearly saturated soil conditions during warm seasons can help to maintain lower ecosystem respiration and therefore enhance the C sequestration capacity in this alpine swamp meadow.
Martijn M. T. A. Pallandt, Jitendra Kumar, Marguerite Mauritz, Edward A. G. Schuur, Anna-Maria Virkkala, Gerardo Celis, Forrest M. Hoffman, and Mathias Göckede
Biogeosciences, 19, 559–583, https://doi.org/10.5194/bg-19-559-2022, https://doi.org/10.5194/bg-19-559-2022, 2022
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Thawing of Arctic permafrost soils could trigger the release of vast amounts of carbon to the atmosphere, thus enhancing climate change. Our study investigated how well the current network of eddy covariance sites to monitor greenhouse gas exchange at local scales captures pan-Arctic flux patterns. We identified large coverage gaps, e.g., in Siberia, but also demonstrated that a targeted addition of relatively few sites can significantly improve network performance.
Pascal Wintjen, Frederik Schrader, Martijn Schaap, Burkhard Beudert, and Christian Brümmer
Biogeosciences, 19, 389–413, https://doi.org/10.5194/bg-19-389-2022, https://doi.org/10.5194/bg-19-389-2022, 2022
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Fluxes of total reactive nitrogen (∑Nr) over a low polluted forest were analyzed with regard to their temporal dynamics. Mostly deposition was observed with median fluxes ranging from −15 to −5 ng N m−2 s−1, corresponding to a range of deposition velocities from 0.2 to 0.5 cm s−1. While seasonally changing contributions of NH3 and NOx to the ∑Nr signal were found, we estimate an annual total N deposition (dry+wet) of 12.2 and 10.9 kg N ha−1 a−1 in the 2 years of observation.
Thomas M. Blattmann
Biogeosciences, 19, 359–373, https://doi.org/10.5194/bg-19-359-2022, https://doi.org/10.5194/bg-19-359-2022, 2022
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This work enunciates the possibility of kerogen oxidation contributing to atmospheric CO2 increase in the wake of glacial episodes. This hypothesis is substantiated by several lines of independent evidence synthesized in this contribution. The author hypothesizes that the deglaciation of kerogen-rich lithologies in western Canada contributed to the characteristic deglacial increase in atmospheric CO2.
Juliana Gil-Loaiza, Joseph R. Roscioli, Joanne H. Shorter, Till H. M. Volkmann, Wei-Ren Ng, Jordan E. Krechmer, and Laura K. Meredith
Biogeosciences, 19, 165–185, https://doi.org/10.5194/bg-19-165-2022, https://doi.org/10.5194/bg-19-165-2022, 2022
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We evaluated a new diffusive soil probe integrated with high-resolution gas analyzers to measure soil gases in real time at a centimeter scale. Using columns with simple silica and soil, we captured changes in carbon dioxide (CO2), volatile organic compounds (VOCs), and nitrous oxide (N2O) with its isotopes to distinguish potential nutrient sources and microbial metabolism. This approach will advance the use of soil gases as important signals to understand and monitor soil fertility and health.
Yujie Wang and Christian Frankenberg
Biogeosciences, 19, 29–45, https://doi.org/10.5194/bg-19-29-2022, https://doi.org/10.5194/bg-19-29-2022, 2022
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Modeling vegetation canopy is important in predicting whether the land remains a carbon sink to mitigate climate change in the near future. Vegetation canopy model complexity, however, impacts the model-predicted carbon and water fluxes as well as canopy fluorescence, even if the same suite of model inputs is used. Given the biases caused by canopy model complexity, we recommend not misusing parameters inverted using different models or assumptions.
Cited articles
Alfieri, J. G. and Blanken, P. D.: How representative is a point? The
spatial variability of surface energy fluxes across short distances in a
sand-sagebrush ecosystem, J. Arid. Environ., 87, 42–49,
https://doi.org/10.1016/j.jaridenv.2012.04.010, 2012.
Anderson, R. G. and Wang, D.: Energy budget closure observed in paired eddy
covariance towers with increased and continuous daily turbulence, Agr.
Forest Meteorol., 184, 204–209, https://doi.org/10.1016/j.agrformet.2013.09.012, 2014.
Baldocchi, D. 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. U., 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, https://doi.org/10.1175/1520-0477(2001)082<2415:FANTTS>2.3.CO;2, 2001.
Bretz, F., Hothorn, T., and Westfall, P.: Multiple Comparisons Using R,
Chapman and Hall, CRC Press, London, 2011.
Burba, G.: Eddy covariance method for scientific, industrial, agricultural
and regulatory applications, LI-COR Biosciences, 2013.
Burba, G. and Anderson, D.: A brief practical guide to eddy covariance flux
measurements: Principles and workflow examples for scientific and industrial
applications, LI-COR Biosciences, Lincoln, Nebraska, USA, available
at: http://www.ncbi.nlm.nih.gov/pubmed/18767616 (last access: 17 July 2018), 2010.
Cava, D., Contini, D., Donateo, A., and Martano, P.: Analysis of short-term
closure of the surface energy balance above short vegetation, Agr. Forest
Meteorol., 148, 82–93, https://doi.org/10.1016/j.agrformet.2007.09.003, 2008.
Charuchittipan, D., Babel, W., Mauder, M., Leps, J. P., and Foken, T.:
Extension of the averaging time in eddy-covariance measurements and its
effect on the energy balance closure, Bound.-Lay. Meteorol., 152,
303–327, https://doi.org/10.1007/s10546-014-9922-6, 2014.
Chen, Y.-Y. and Li, M.-H.: Determining adequate averaging periods and
reference coordinates for eddy covariance measurements of surface heat and
water vapor fluxes over mountainous terrain, Terr. Atmos. Ocean. Sci.,
23, 685, https://doi.org/10.3319/TAO.2012.05.02.01(Hy), 2012.
Demyan, M. S., Ingwersen, J., Funkuin, Y. N., Ali, R. S.,
Mirzaeitalarposhti, R., Rasche, F., Poll, C., Müller, T., Streck, T.,
Kandeler, E., and Cadisch, G.: Partitioning of ecosystem respiration in
winter wheat and silage maize-modeling seasonal temperature effects, Agr.
Ecosyst. Environ., 224, 131–144, https://doi.org/10.1016/j.agee.2016.03.039, 2016.
Du, Q., Liu, H. Z., Feng, J. W., and Wang, L.: Effects of different gap
filling methods and land surface energy balance closure on annual net
ecosystem exchange in a semiarid area of China, Sci. China Earth Sci.,
57, 1340–1351, https://doi.org/10.1007/s11430-013-4756-5, 2014.
Eshonkulov, R., Poyda, A., Ingwersen, J., Pulatov, A., and Streck, T.:
Improving the energy balance closure over a winter wheat field by accounting
for minor storage terms, Agr. Forest Meteorol., 264, 283–296,
https://doi.org/10.1016/J.AGRFORMET.2018.10.012, 2019.
Eugster, W. and Merbold, L.: Eddy covariance for quantifying trace gas fluxes
from soils, SOIL, 1, 187–205, https://doi.org/10.5194/soil-1-187-2015, 2015.
Faraway, J. J.: Linear models with R, CHAPMAN & HALL/CRC, Boca Raton
London NewYork Washington, DC, 2014.
Feigenwinter, C., Bernhofer, C., Eichelmann, U., Heinesch, B., Hertel, M.,
Janous, D., Kolle, O., Lagergren, F., Lindroth, A., Minerbi, S., Moderow, U.,
Montagnani, L., Queck, R., Rebmann, C., Vestin, P., Yernaux, M., Zeri, M.,
Ziegler, W., and Aubinet, M.: Comparison of horizontal and vertical advective
CO2 fluxes at three forest sites, Agr. Forest Meteorol., 148,
12–24, https://doi.org/10.1016/j.agrformet.2007.08.013, 2008.
Foken, T.: Micrometeorology, 1st ed., Springer-Verlag Berlin Heidelberg, 2008.
Foken, T.: The energy balance closure problem: an overview, Ecol. Appl., 18,
1351–1367, https://doi.org/10.1890/06-0922.1, 2008b.
Foken, T., Göockede, M., Mauder, M., Mahrt, L., Amiro, B., and Munger,
W.: Post-Field Data Quality Control, in Handbook of Micrometeorology,
181–208, Kluwer Academic Publishers, Dordrecht, 2004.
Foken, T., Mauder, M., Liebethal, C., Wimmer, F., Beyrich, F., Leps, J. P.,
Raasch, S., DeBruin, H. A. R., Meijninger, W. M. L., and Bange, J.: Energy
balance closure for the LITFASS-2003 experiment, Theor. Appl. Climatol., 101,
149–160, https://doi.org/10.1007/s00704-009-0216-8, 2010.
Franssen, H. J. H., Stöckli, R., Lehner, I., Rotenberg, E., and
Seneviratne, S. I.: Energy balance closure of eddy-covariance data: A
multisite analysis for European FLUXNET stations, Agr. Forest Meteorol., 150,
1553–1567, https://doi.org/10.1016/j.agrformet.2010.08.005, 2010.
Fratini, G. and Mauder, M.: Towards a consistent eddy-covariance processing:
an intercomparison of EddyPro and TK3, Atmos. Meas. Tech., 7, 2273–2281,
https://doi.org/10.5194/amt-7-2273-2014, 2014.
Friebel, H. C., Herrington, T. O., and Benilov, A. Y.: Evaluation of the flow
distortion around the Campbell Scientific CSAT3 sonic anemometer relative to
incident wind direction, J. Atmos. Ocean. Tech., 26, 582–592,
https://doi.org/10.1175/2008JTECHO550.1, 2009.
Göckede, M., Markkanen, T., Hasager, C. B., and Foken, T.: Update of a
footprint-based approach for the characterisation of complex measurement
sites, Bound.-Lay. Meteorol., 118, 635–655, https://doi.org/10.1007/s10546-005-6435-3,
2006.
Gregory, R. W., Ben, B., Lodewijk, B., Robert, G., Wolfgang, H., Andy, L.,
Thomas, L., Martin, M., Arni, M., Steffen, M., Marc, S., and Bill, V.:
gplots: Various R programming tools for plotting data, available at: https://cran.r-project.org/web/packages/gplots/index.html (last access: 17 July 2018), 2009.
Gregory, R. W., Bolker, B., Gorjanc, G., Grothendieck, G., Korosec, A.,
Lumley, T., MacQueen, D., Magnusson, A., and Rogers, J.: Package “gdata”. Various R programming tools for data manipulation,
available at: https://cran.r-project.org/web/packages/gdata/index.html (last access: 17 July 2018),
2017.
Heinesch, B., Yernaux, Y., and Aubinet, M.: Dependence of CO2 advection
patterns on wind direction on a gentle forested slope, Biogeosciences, 5,
657–668, https://doi.org/10.5194/bg-5-657-2008, 2008.
Hothorn, T., Bretz, F., and Westfall, P.: Simultaneous Inference in General
Parametric Models, Biometrical J., 50, 346–363, 2017.
Imukova, K., Ingwersen, J., Hevart, M., and Streck, T.: Energy balance
closure on a winter wheat stand: comparing the eddy covariance technique with
the soil water balance method, Biogeosciences, 13, 63–75,
https://doi.org/10.5194/bg-13-63-2016, 2016.
Ingwersen, J., Steffens, K., Högy, P., Warrach-Sagi, K., Zhunusbayeva,
D., Poltoradnev, M., Gäbler, R., Wizemann, H. D., Fangmeier, A.,
Wulfmeyer, V., and Streck, T.: Comparison of Noah simulations with eddy
covariance and soil water measurements at a winter wheat stand, Agr. Forest Meteorol., 151, 345–355, https://doi.org/10.1016/j.agrformet.2010.11.010,
2011.
Ingwersen, J., Imukova, K., Högy, P., and Streck, T.: On the use of the
post-closure methods uncertainty band to evaluate the performance of land
surface models against eddy covariance flux data, Biogeosciences, 12,
2311–2326, https://doi.org/10.5194/bg-12-2311-2015, 2015.
Ingwersen, J., Högy, P., Wizemann, H. D., Warrach-Sagi, K., and Streck,
T.: Coupling the land surface model Noah-MP with the generic crop growth
model Gecros: Model description, calibration and validation, Agr. Forest
Meteorol., 262, 322–339, https://doi.org/10.1016/J.AGRFORMET.2018.06.023,
2018.
IUSS Working Group WRB: World reference base for soil resources 2014,
International soil classification system for naming soils and creating
legends for soil maps, FAO, Rome, Italy, 2014.
Jacobs, A. F. G., Heusinkveld, B. G., and Holtslag, A. A. M.: Towards closing
the surface energy budget of a mid-latitude grassland, Bound.-Lay. Meteorol.,
126, 125–136, https://doi.org/10.1007/s10546-007-9209-2, 2008.
Kaimal, J. C. and Gaynor, J. E.: Another look at sonic thermometry,
Bound.-Lay. Meteorol., 56, 401–410, 1991.
Kidston, J., Brümmer, C., Black, T. A., Morgenstern, K., Nesic, Z.,
McCaughey, J. H., and Barr, A. G.: Energy balance closure using eddy
covariance above two different land surfaces and Implications for
CO2 flux measurements, Bound.-Lay. Meteorol., 136, 193–218,
https://doi.org/10.1007/s10546-010-9507-y, 2010.
Kilinc, M., Beringer, J., Hutley, L. B., Haverd, V., and Tapper, N.: An
analysis of the surface energy budget above the world's tallest angiosperm
forest, Agr. Forest Meteorol., 166–167, 23–31,
https://doi.org/10.1016/J.AGRFORMET.2012.05.014, 2012.
Kim, S., Lee, Y.-H., Kim, K. R., and Park, Y.-S.: Analysis of surface energy
balance closure over heterogeneous surfaces, Asia-Pacific, J. Atmos. Sci.,
50, 1–13, https://doi.org/10.1007/s13143-014-0045-2, 2014.
Kljun, N., Rotach, M. W., and Schmid, H. P.: A three-dimensional backward
lagrangian footprint, Bound.-Lay. Meteorol., 103, 205–226, 2002.
Kljun, N., Calanca, P., Rotach, M. W., and Schmid, H. P.: A simple
parameterisation for flux footprint predictions, Bound.-Lay. Meteorol., 112,
503–523, https://doi.org/10.1023/B:BOUN.0000030653.71031.96, 2004.
Kljun, N., Calanca, P., Rotach, M. W., and Schmid, H. P.: A simple
two-dimensional parameterisation for Flux Footprint Prediction (FFP), Geosci.
Model Dev., 8, 3695–3713, https://doi.org/10.5194/gmd-8-3695-2015, 2015.
Kohsiek, W., Liebethal, C., Foken, T., Vogt, R., Oncley, S. P., Bernhofer,
C., and Debruin, H. A. R.: The Energy Balance Experiment EBEX-2000. Part III:
Behaviour and quality of the radiation measurements, Bound.-Lay. Meteorol.,
123, 55–75, https://doi.org/10.1007/s10546-006-9135-8, 2007.
Kutsch, W. L., Kolle, O., Rebmann, C., Knohl, A., Ziegler, W., and Schulze,
E. D.: Advection and resulting CO2 exchange uncertainty in a tall
forest in central Germany, Ecol. Appl., 18, 1391–1405,
https://doi.org/10.1890/06-1301.1, 2008.
Lan, C., Liu, H., Li, D., Katul, G. G., and Finn, D.: Distinct turbulence
structures in stably stratified boundary layers with weak and strong surface
shear, J. Geophys. Res.-Atmos., 123, 7839–7854, https://doi.org/10.1029/2018JD028628,
2018.
Lenschow, D. H., Mann, J., Kristensen, L., Lenschow, D. H., Mann, J., and
Kristensen, L.: How long is long enough when measuring fluxes and other
turbulence statistics?, J. Atmos. Ocean. Tech., 11, 661–673,
https://doi.org/10.1175/1520-0426(1994)011<0661:HLILEW>2.0.CO;2, 1994.
LI-COR Inc.: EddyPro Software. Instruction manual, LI-COR Biosciences, 2012.
Loescher, H. W., Law, B. E., Mahrt, L., Hollinger, D. Y., Campbell, J., and
Wofsy, S. C.: Uncertainties in, and interpretation of, carbon flux estimates
using the eddy covariance technique, J. Geophys. Res, 111, 21–90,
https://doi.org/10.1029/2005JD006932, 2006.
Mahrt, L.: Flux sampling errors for aircraft and towers, J. Atmos. Ocean.
Tech., 15, 416–429,
https://doi.org/10.1175/1520-0426(1998)015<0416:FSEFAA>2.0.CO;2, 1998.
Majozi, N. P., Mannaerts, C. M., Ramoelo, A., Mathieu, R., Nickless, A., and
Verhoef, W.: Analysing surface energy balance closure and partitioning over a
semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South
Africa, Hydrol. Earth Syst. Sci., 21, 3401–3415,
https://doi.org/10.5194/hess-21-3401-2017, 2017.
Masseroni, D., Corbari, C., and Mancini, M.: Limitations and improvements of
the energy balance closure with reference to experimental data measured over
a maize field, Atmosfera, 27, 335–352, https://doi.org/10.1016/S0187-6236(14)70033-5,
2014.
Mauder, M. and Foken, T.: Documentation and instruction manual of the
eddy-covariance software package TK3, Arbeitsergebnisse, Nr. 46,
Universität Bayreuth, Abt. Mikrometeorologie, Bayreuth, 2011.
Mauder, M., Desjardins, R. L., Pattey, E., and Worth, D.: An attempt to close
the daytime surface energy balance using spatially-averaged flux
measurements, Bound.-Lay. Meteorol., 136, 175–191,
https://doi.org/10.1007/s10546-010-9497-9, 2010.
Mauder, M., Cuntz, M., Drüe, C., Graf, A., Rebmann, C., Schmid, H. P.,
Schmidt, M., and Steinbrecher, R.: A strategy for quality and uncertainty
assessment of long-term eddy-covariance measurements, Agr. Forest Meteorol.,
169, 122–135, https://doi.org/10.1016/j.agrformet.2012.09.006, 2013.
Meyers, T. P. and Hollinger, S. E.: An assessment of storage terms in the
surface energy balance of maize and soybean, Agr. Forest Meteorol., 125,
105–115, https://doi.org/10.1016/j.agrformet.2004.03.001, 2004.
Moore, C. J.: Frequency response corrections for eddy correlation systems,
Bound.-Lay. Meteorol., 37, 17–35, https://doi.org/10.1007/BF00122754, 1986.
Oncley, S. P., Foken, T., Vogt, R., Kohsiek, W., DeBruin, H. A. R.,
Bernhofer, C., Christen, A., van Gorsel, E., Grantz, D., Feigenwinter, C.,
Lehner, I., Liebethal, C., Liu, H., Mauder, M., Pitacco, A., Ribeiro, L., and
Weidinger, T.: The energy balance experiment EBEX-2000. Part I: overview and
energy balance, Bound.-Lay. Meteorol., 123, 1–28,
https://doi.org/10.1007/s10546-007-9161-1, 2007.
Panin, G. N., Tetzlaff, G., and Raabe, A.: Inhomogeneity of the land surface
and problems in the parameterization of surface fluxes in natural conditions,
Theor. Appl. Climatol., 60, 163–178, https://doi.org/10.1007/s007040050041, 1998.
Peng, D., Zhang, X., Wu, C., Huang, W., Gonsamo, A., Huete, A. R., Didan, K.,
Tan, B., Liu, X., and Zhang, B.: Intercomparison and evaluation of spring
phenology products using National Phenology Network and AmeriFlux
observations in the contiguous United States, Agr. Forest Meteorol., 242,
33–46, https://doi.org/10.1016/J.AGRFORMET.2017.04.009, 2017.
Piepho, H. P., Buchse, A., and Richter, C.: A mixed modelling approach for
randomized experiments with repeated measures, J. Agron. Crop Sci., 190,
230–247, https://doi.org/10.1111/j.1439-037X.2004.00097.x, 2004.
Ping, Y., Qiang, Z., Shengjie, N., Hua, C., and Xiyu, W.: Effects of the soil
heat flux estimates on surface energy balance closure over a semi-arid
grassland, Acta Meteorol. Sin., 25, 774–782, https://doi.org/10.1007/s13351-011-0608-4,
2011.
Pinheiro, J., Bates, D., DebRoy, S., Sarkar, D., and Team, R. C.: nlme:
Linear and nonlinear mixed effects models, R package version 3.1-125, 2016.
Pirk, N., Sievers, J., Mertes, J., Parmentier, F.-J. W., Mastepanov, M., and
Christensen, T. R.: Spatial variability of CO2 uptake in polygonal tundra:
assessing low-frequency disturbances in eddy covariance flux estimates,
Biogeosciences, 14, 3157–3169, https://doi.org/10.5194/bg-14-3157-2017,
2017.
R Core Team: A language and environment for statistical computing. R
foundation for statistical computing, Vienna, Austria, 2014.
Rebmann, C., Zeri, M., Lasslop, G., Mund, M., Kolle, O., Schulze, E., and
Feigenwinter, C.: Treatment and assessment of the CO2 exchange at a
complex forest site in Thuringia, Germany, Agr. Forest Meteorol., 150,
684–691, https://doi.org/10.1016/j.agrformet.2009.11.001, 2010.
Sánchez, J. M., Caselles, V., and Rubio, E. M.: Analysis of the energy
balance closure over a FLUXNET boreal forest in Finland, Hydrol. Earth Syst.
Sci., 14, 1487–1497, https://doi.org/10.5194/hess-14-1487-2010, 2010.
Schmid, H. P.: Footprint modeling for vegetation atmosphere exchange studies:
A review and perspective, Agr. Forest Meteorol., 113, 159–183,
https://doi.org/10.1016/S0168-1923(02)00107-7, 2002.
Schotanus, P., Nieuwstadt, F. T. M., and De Bruin, H. A. R.: Temperature
measurement with a sonic anemometer and its application to heat and moisture
fluxes, Bound.-Lay. Meteorol., 26, 81–93, https://doi.org/10.1007/BF00164332, 1983.
Sievers, J., Papakyriakou, T., Larsen, S. E., Jammet, M. M., Rysgaard, S.,
Sejr, M. K., and Sørensen, L. L.: Estimating surface fluxes using eddy
covariance and numerical ogive optimization, Atmos. Chem. Phys., 15,
2081–2103, https://doi.org/10.5194/acp-15-2081-2015, 2015.
Stoy, P. C., Mauder, M., Foken, T., Marcolla, B., Boegh, E., Ibrom, A.,
Arain, M. A., Arneth, A., Aurela, M., Bernhofer, C., Cescatti, A., Dellwik,
E., Duce, P., Gianelle, D., van Gorsel, E., Kiely, G., Knohl, A., Margolis,
H., Mccaughey, H., Merbold, L., Montagnani, L., Papale, D., Reichstein, M.,
Saunders, M., Serrano-Ortiz, P., Sottocornola, M., Spano, D., Vaccari, F.,
and Varlagin, A.: A data-driven analysis of energy balance closure across
FLUXNET research sites: The role of landscape scale heterogeneity, Agr.
Forest Meteorol., 171–172, 137–152, https://doi.org/10.1016/j.agrformet.2012.11.004,
2013.
Stull, B. R.: An introduction to boundary layer meteorology, Kluwer
Acd.Publ., Dordrecht, Boston, London, 1988.
Sun, J., Mahrt, L., Banta, R. M., Pichugina, Y. L., Sun, J., Mahrt, L.,
Banta, R. M., and Pichugina, Y. L.: Turbulence regimes and turbulence
intermittency in the stable boundary layer during CASES-99, J. Atmos. Sci.,
69, 338–351, https://doi.org/10.1175/JAS-D-11-082.1, 2012.
Sun, X. M., Zhu, Z. L., Wen, X. F., Yuan, G. F., and Yu, G. R.: The impact of
averaging period on eddy fluxes observed at ChinaFLUX sites, Agr. Forest
Meteorol., 137, 188–193, https://doi.org/10.1016/j.agrformet.2006.02.012, 2006.
Twine, T. E., Kustas, W. P., Norman, J. M., Cook, D. R., Houser, P. R.,
Meyers, T. P., Prueger, J. H., Starks, P. J., and Wesel, M. L.: Correcting
eddy-covariance flux understimates over a grassland, Agr. Forest Meteorol.,
103, 229–317, 2000.
Varmaghani, A., Eichinger, W. E., and Prueger, J. H.: A diagnostic approach
towards the causes of energy balance closure problem, Open J. Mod. Hydrol.,
6, 101–114, 2016.
Vickers, D. and Mahrt, L.: Quality control and flux sampling problems for
tower and aircraft data, J. Atmos. Ocean. Tech., 14, 512–526,
https://doi.org/10.1175/1520-0426(1997)014<0512:QCAFSP>2.0.CO;2, 1997.
Vickers, D. and Mahrt, L.: A solution for flux contamination by mesoscale
motions with very weak turbulence, Bound.-Lay. Meteorol., 118, 431–447,
https://doi.org/10.1007/s10546-005-9003-y, 2006.
Webb, E. K., Pearman, G. I., and Leuning, R.: Correction of flux measurements
for density effects due to heat and water vapour transfer, Q. J. Roy.
Meteorol. Soc., 106, 85–100, https://doi.org/10.1002/qj.49710644707, 1980.
Wilczak, J. M., Oncley, S. P., and Stage, S. A.: Sonic anemometer tilt
correction algorithms, Bound.-Lay. Meteorol., 99, 127–150,
https://doi.org/10.1023/A:1018966204465, 2001.
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., 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,
https://doi.org/10.1016/S0168-1923(02)00109-0, 2002.
Wizemann, H. D., Ingwersen, J., Högy, P., Warrach-Sagi, K., Streck, T.,
and Wulfmeyer, V.: Three year observations of water vapor and energy fluxes
over agricultural crops in two regional climates of Southwest Germany,
Meteorol. Z., 24, 39–59, https://doi.org/10.1127/metz/2014/0618, 2014.
Xin, Y.-F., Chen, F., Zhao, P., Barlage, M., Blanken, P., Chen, Y.-L., Chen,
B., and Wang, Y.-J.: Surface energy balance closure at ten sites over the
Tibetan plateau, Agr. Forest Meteorol., 259, 317–328,
https://doi.org/10.1016/j.agrformet.2018.05.007, 2018.
Xu, Z., Liu, S., Shi, W., and Wang, J.: Assessment of the energy balance
closure under advective conditions and Its impact using remote sensing data,
Am. Meteorol. Soc., 56, 127–140, https://doi.org/10.1175/JAMC-D-16-0096.1,
2017.
Zeri, M. and Sá, L. D. A.: The impact of data gaps and quality control
filtering on the balances of energy and carbon for a Southwest Amazon forest,
Agr. Forest Meteorol., 150, 1543–1552, https://doi.org/10.1016/j.agrformet.2010.08.004,
2010.
Short summary
We compared the energy balance closure (EBC) under varying environmental conditions and investigated a wide range of possible reasons for the energy imbalance. As measures for the imbalance, we used ordinary linear regression, the energy balance ratio (EBR), and the energy residual. The EBR was also investigated as a function of buoyancy, friction velocity, and atmospheric stability. Moreover, the relationship between the EBC and flux source area or footprint was also investigated.
We compared the energy balance closure (EBC) under varying environmental conditions and...
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