Articles | Volume 19, issue 3
https://doi.org/10.5194/bg-19-861-2022
© Author(s) 2022. 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-19-861-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
10 Feb 2022
Research article |
| 10 Feb 2022
| 10 Feb 2022
Radiation, soil water content, and temperature effects on carbon cycling in an alpine swamp meadow of the northeastern Qinghai–Tibetan Plateau
Junqi Wei
State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
Academy of Plateau Science and Sustainability, People's Government of Qinghai Province and Beijing Normal University, Qinghai Normal University, Xining 810008, China
Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation, Ministry of Education, Qinghai Normal University, Xining 810016, China
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
College of Resources and Environment, University of Chinese Academy of Sciences, Yuquanlu, Beijing 100049, China
Torben Røjle Christensen
Department of Ecoscience, Arctic Research Center, Aarhus University, Roskilde 4000, Denmark
Oulanka Research Station, University of Oulu, Oulu, Finland
Zhiyun Jiang
School of Geography, South China Normal University, Guangzhou 510631, China
Yujun Ma
School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China
Xiuchen Wu
State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
Hongyun Yao
State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
Efrén López-Blanco
Department of Environment and Minerals, Greenland Institute of Natural Resources, Nuuk 3900, Greenland
Department of Ecoscience, Arctic Research Center, Aarhus University, Roskilde 4000, Denmark
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Fangzhong Shi, Xiaoyan Li, Shaojie Zhao, Yujun Ma, Junqi Wei, Qiwen Liao, and Deliang Chen
Hydrol. Earth Syst. Sci., 28, 163–178, https://doi.org/10.5194/hess-28-163-2024, https://doi.org/10.5194/hess-28-163-2024, 2024
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(1) Evaporation under ice-free and sublimation under ice-covered conditions and its influencing factors were first quantified based on 6 years of eddy covariance observations. (2) Night evaporation of Qinghai Lake accounts for more than 40 % of the daily evaporation. (3) Lake ice sublimation reaches 175.22 ± 45.98 mm, accounting for 23 % of the annual evaporation. (4) Wind speed weakening may have resulted in a 7.56 % decrease in lake evaporation during the ice-covered period from 2003 to 2017.
Anna-Maria Virkkala, Susan M. Natali, Brendan M. Rogers, Jennifer D. Watts, Kathleen Savage, Sara June Connon, Marguerite Mauritz, Edward A. G. Schuur, Darcy Peter, Christina Minions, Julia Nojeim, Roisin Commane, Craig A. Emmerton, Mathias Goeckede, Manuel Helbig, David Holl, Hiroki Iwata, Hideki Kobayashi, Pasi Kolari, Efrén López-Blanco, Maija E. Marushchak, Mikhail Mastepanov, Lutz Merbold, Frans-Jan W. Parmentier, Matthias Peichl, Torsten Sachs, Oliver Sonnentag, Masahito Ueyama, Carolina Voigt, Mika Aurela, Julia Boike, Gerardo Celis, Namyi Chae, Torben R. Christensen, M. Syndonia Bret-Harte, Sigrid Dengel, Han Dolman, Colin W. Edgar, Bo Elberling, Eugenie Euskirchen, Achim Grelle, Juha Hatakka, Elyn Humphreys, Järvi Järveoja, Ayumi Kotani, Lars Kutzbach, Tuomas Laurila, Annalea Lohila, Ivan Mammarella, Yojiro Matsuura, Gesa Meyer, Mats B. Nilsson, Steven F. Oberbauer, Sang-Jong Park, Roman Petrov, Anatoly S. Prokushkin, Christopher Schulze, Vincent L. St. Louis, Eeva-Stiina Tuittila, Juha-Pekka Tuovinen, William Quinton, Andrej Varlagin, Donatella Zona, and Viacheslav I. Zyryanov
Earth Syst. Sci. Data, 14, 179–208, https://doi.org/10.5194/essd-14-179-2022, https://doi.org/10.5194/essd-14-179-2022, 2022
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The effects of climate warming on carbon cycling across the Arctic–boreal zone (ABZ) remain poorly understood due to the relatively limited distribution of ABZ flux sites. Fortunately, this flux network is constantly increasing, but new measurements are published in various platforms, making it challenging to understand the ABZ carbon cycle as a whole. Here, we compiled a new database of Arctic–boreal CO2 fluxes to help facilitate large-scale assessments of the ABZ carbon cycle.
Johan H. Scheller, Mikhail Mastepanov, Hanne H. Christiansen, and Torben R. Christensen
Biogeosciences, 18, 6093–6114, https://doi.org/10.5194/bg-18-6093-2021, https://doi.org/10.5194/bg-18-6093-2021, 2021
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Our study presents a time series of methane emissions in a high-Arctic-tundra landscape over 14 summers, which shows large variations between years. The methane emissions from the valley are expected to more than double in the late 21st century. This warming increases permafrost thaw, which could increase surface erosion in the valley. Increased erosion could offset some of the rise in methane fluxes from the valley, but this would require large-scale impacts on vegetated surfaces.
Maierdang Keyimu, Zongshan Li, Bojie Fu, Guohua Liu, Fanjiang Zeng, Weiliang Chen, Zexin Fan, Keyan Fang, Xiuchen Wu, and Xiaochun Wang
Clim. Past, 17, 2381–2392, https://doi.org/10.5194/cp-17-2381-2021, https://doi.org/10.5194/cp-17-2381-2021, 2021
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We created a residual tree-ring width chronology and reconstructed non-growth-season precipitation (NGSP) over the period spanning 1600–2005 in the southeastern Tibetan Plateau (SETP), China. Reconstruction model verification as well as similar variations of NGSP reconstruction and Palmer Drought Severity Index reconstructions from the surrounding region indicate the reliability of the present reconstruction. Our reconstruction is representative of NGSP variability of a large region in the SETP.
Yuting Yang, Shulei Zhang, Michael L. Roderick, Tim R. McVicar, Dawen Yang, Wenbin Liu, and Xiaoyan Li
Hydrol. Earth Syst. Sci., 24, 2921–2930, https://doi.org/10.5194/hess-24-2921-2020, https://doi.org/10.5194/hess-24-2921-2020, 2020
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Many previous studies using offline drought indices report that future warming will increase worldwide drought. However, this contradicts observations/projections of vegetation greening and increased runoff. We resolved this paradox by re-calculating the same drought indices using direct climate model outputs and find no increase in future drought as the climate warms. We also find that accounting for the impact of CO2 on plant transpiration avoids the previous overestimation of drought.
Efrén López-Blanco, Jean-François Exbrayat, Magnus Lund, Torben R. Christensen, Mikkel P. Tamstorf, Darren Slevin, Gustaf Hugelius, Anthony A. Bloom, and Mathew Williams
Earth Syst. Dynam., 10, 233–255, https://doi.org/10.5194/esd-10-233-2019, https://doi.org/10.5194/esd-10-233-2019, 2019
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The terrestrial CO2 exchange in Arctic ecosystems plays an important role in the global carbon cycle and is particularly sensitive to the ongoing warming experienced in recent years. To improve our understanding of the atmosphere–biosphere interplay, we evaluated the state of the terrestrial pan-Arctic carbon cycling using a promising data assimilation system in the first 15 years of the 21st century. This is crucial when it comes to making predictions about the future state of the carbon cycle.
Mehdi Rahmati, Lutz Weihermüller, Jan Vanderborght, Yakov A. Pachepsky, Lili Mao, Seyed Hamidreza Sadeghi, Niloofar Moosavi, Hossein Kheirfam, Carsten Montzka, Kris Van Looy, Brigitta Toth, Zeinab Hazbavi, Wafa Al Yamani, Ammar A. Albalasmeh, Ma'in Z. Alghzawi, Rafael Angulo-Jaramillo, Antônio Celso Dantas Antonino, George Arampatzis, Robson André Armindo, Hossein Asadi, Yazidhi Bamutaze, Jordi Batlle-Aguilar, Béatrice Béchet, Fabian Becker, Günter Blöschl, Klaus Bohne, Isabelle Braud, Clara Castellano, Artemi Cerdà, Maha Chalhoub, Rogerio Cichota, Milena Císlerová, Brent Clothier, Yves Coquet, Wim Cornelis, Corrado Corradini, Artur Paiva Coutinho, Muriel Bastista de Oliveira, José Ronaldo de Macedo, Matheus Fonseca Durães, Hojat Emami, Iraj Eskandari, Asghar Farajnia, Alessia Flammini, Nándor Fodor, Mamoun Gharaibeh, Mohamad Hossein Ghavimipanah, Teamrat A. Ghezzehei, Simone Giertz, Evangelos G. Hatzigiannakis, Rainer Horn, Juan José Jiménez, Diederik Jacques, Saskia Deborah Keesstra, Hamid Kelishadi, Mahboobeh Kiani-Harchegani, Mehdi Kouselou, Madan Kumar Jha, Laurent Lassabatere, Xiaoyan Li, Mark A. Liebig, Lubomír Lichner, María Victoria López, Deepesh Machiwal, Dirk Mallants, Micael Stolben Mallmann, Jean Dalmo de Oliveira Marques, Miles R. Marshall, Jan Mertens, Félicien Meunier, Mohammad Hossein Mohammadi, Binayak P. Mohanty, Mansonia Pulido-Moncada, Suzana Montenegro, Renato Morbidelli, David Moret-Fernández, Ali Akbar Moosavi, Mohammad Reza Mosaddeghi, Seyed Bahman Mousavi, Hasan Mozaffari, Kamal Nabiollahi, Mohammad Reza Neyshabouri, Marta Vasconcelos Ottoni, Theophilo Benedicto Ottoni Filho, Mohammad Reza Pahlavan-Rad, Andreas Panagopoulos, Stephan Peth, Pierre-Emmanuel Peyneau, Tommaso Picciafuoco, Jean Poesen, Manuel Pulido, Dalvan José Reinert, Sabine Reinsch, Meisam Rezaei, Francis Parry Roberts, David Robinson, Jesús Rodrigo-Comino, Otto Corrêa Rotunno Filho, Tadaomi Saito, Hideki Suganuma, Carla Saltalippi, Renáta Sándor, Brigitta Schütt, Manuel Seeger, Nasrollah Sepehrnia, Ehsan Sharifi Moghaddam, Manoj Shukla, Shiraki Shutaro, Ricardo Sorando, Ajayi Asishana Stanley, Peter Strauss, Zhongbo Su, Ruhollah Taghizadeh-Mehrjardi, Encarnación Taguas, Wenceslau Geraldes Teixeira, Ali Reza Vaezi, Mehdi Vafakhah, Tomas Vogel, Iris Vogeler, Jana Votrubova, Steffen Werner, Thierry Winarski, Deniz Yilmaz, Michael H. Young, Steffen Zacharias, Yijian Zeng, Ying Zhao, Hong Zhao, and Harry Vereecken
Earth Syst. Sci. Data, 10, 1237–1263, https://doi.org/10.5194/essd-10-1237-2018, https://doi.org/10.5194/essd-10-1237-2018, 2018
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This paper presents and analyzes a global database of soil infiltration data, the SWIG database, for the first time. In total, 5023 infiltration curves were collected across all continents in the SWIG database. These data were either provided and quality checked by the scientists or they were digitized from published articles. We are convinced that the SWIG database will allow for a better parameterization of the infiltration process in land surface models and for testing infiltration models.
Efrén López-Blanco, Magnus Lund, Mathew Williams, Mikkel P. Tamstorf, Andreas Westergaard-Nielsen, Jean-François Exbrayat, Birger U. Hansen, and Torben R. Christensen
Biogeosciences, 14, 4467–4483, https://doi.org/10.5194/bg-14-4467-2017, https://doi.org/10.5194/bg-14-4467-2017, 2017
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An improvement in our process-based understanding of CO2 exchanges in the Arctic and their climate sensitivity is critical. With continued warming temperatures and longer growing seasons, tundra systems will likely increase rates of C cycling, although shifts in sink strength could take place, challenging the forecast of upcoming C states. In this context, we investigated the functional responses of C exchange to environmental characteristics across 8 consecutive years in West Greenland.
Si-Yi Zhang and Xiao-Yan Li
Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2016-589, https://doi.org/10.5194/hess-2016-589, 2016
Manuscript not accepted for further review
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We redefined some hypotheses and parameters of a widespread used analytical model to adapt to the special canopy structure of the deciduous shrub, the results showed that the new model had better performance than the original model. The results also revealed that the importance of stem evaporation in deciduous shrub interception which could be underestimated in the original model.
X. Wu, N. Vuichard, P. Ciais, N. Viovy, N. de Noblet-Ducoudré, X. Wang, V. Magliulo, M. Wattenbach, L. Vitale, P. Di Tommasi, E. J. Moors, W. Jans, J. Elbers, E. Ceschia, T. Tallec, C. Bernhofer, T. Grünwald, C. Moureaux, T. Manise, A. Ligne, P. Cellier, B. Loubet, E. Larmanou, and D. Ripoche
Geosci. Model Dev., 9, 857–873, https://doi.org/10.5194/gmd-9-857-2016, https://doi.org/10.5194/gmd-9-857-2016, 2016
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The response of crops to changing climate and atmospheric CO2 could have large effects on food production, terrestrial carbon, water, energy fluxes and the climate feedbacks. We developed a new process-oriented terrestrial biogeochemical model named ORCHIDEE-CROP (v0), which integrates a generic crop phenology and harvest module into the land surface model ORCHIDEE. Our model has good ability to capture the spatial gradients of crop phenology, carbon and energy-related variables across Europe.
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Compound soil and atmospheric drought (CSAD) events and CO2 fluxes of a mixed deciduous forest: the occurrence, impact, and temporal contribution of main drivers
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Interpretability of negative latent heat fluxes from eddy covariance measurements in dry conditions
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Matthew G. Davis, Kevin Yan, and Jennifer G. Murphy
Biogeosciences, 21, 5381–5392, https://doi.org/10.5194/bg-21-5381-2024, https://doi.org/10.5194/bg-21-5381-2024, 2024
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Ammonia applied as fertilizer can volatilize into the atmosphere. This can threaten vulnerable ecosystems and human health. We investigated the partitioning of ammonia between an immobile adsorbed phase and mobile aqueous phase using several adsorption models. Using the Temkin model we determined that previous approaches to this issue may overestimate the quantity available for exchange by a factor of 5–20, suggesting that ammonia emissions from soil may be overestimated.
Annika Einbock and Franz Conen
Biogeosciences, 21, 5219–5231, https://doi.org/10.5194/bg-21-5219-2024, https://doi.org/10.5194/bg-21-5219-2024, 2024
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A small fraction of particles found at great heights in the atmosphere can freeze cloud droplets at temperatures of ≥ −10 °C and thus influence cloud properties. We provide a novel type of evidence that plant canopies are a major source of such biological ice-nucleating particles in the air above the Alps, potentially affecting mixed-phase cloud development.
Stephen E. Schwartz
Biogeosciences, 21, 5045–5057, https://doi.org/10.5194/bg-21-5045-2024, https://doi.org/10.5194/bg-21-5045-2024, 2024
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Anticorrelation in uptake of atmospheric CO2 following pulse emission or abrupt cessation of emissions is examined in two key model intercomparison studies. In both studies net transfer coefficients from the atmosphere to the world ocean and the terrestrial biosphere are anticorrelated across models, reducing inter-model diversity in decrease of atmospheric CO2 following the perturbation, increasing uncertainties of global warming potentials and consequences of prospective emission reductions.
Qian Li, Gil Lerner, Einat Bar, Efraim Lewinsohn, and Eran Tas
Biogeosciences, 21, 4133–4147, https://doi.org/10.5194/bg-21-4133-2024, https://doi.org/10.5194/bg-21-4133-2024, 2024
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Our research indicates that instantaneous changes in meteorological parameters better reflect drought-induced changes in the emission rates of biogenic volatile organic compounds (BVOCs) from natural vegetation than their absolute values. However, following a small amount of irrigation, this trend became more moderate or reversed, accompanied by a dramatic increase in BVOC emission rates. These findings advance our understanding of BVOC emissions under climate change.
Pia Gottschalk, Aram Kalhori, Zhan Li, Christian Wille, and Torsten Sachs
Biogeosciences, 21, 3593–3616, https://doi.org/10.5194/bg-21-3593-2024, https://doi.org/10.5194/bg-21-3593-2024, 2024
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To improve the accuracy of spatial carbon exchange estimates, we evaluated simple linear models for net ecosystem exchange (NEE) and gross primary productivity (GPP) and how they can be used to upscale the CO2 exchange of agricultural fields. The models are solely driven by Sentinel-2-derived vegetation indices (VIs). Evaluations show that different VIs have variable power to estimate NEE and GPP of crops in different years. The overall performance is as good as results from complex crop models.
Liliana Scapucci, Ankit Shekhar, Sergio Aranda-Barranco, Anastasiia Bolshakova, Lukas Hörtnagl, Mana Gharun, and Nina Buchmann
Biogeosciences, 21, 3571–3592, https://doi.org/10.5194/bg-21-3571-2024, https://doi.org/10.5194/bg-21-3571-2024, 2024
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Forests face increased exposure to “compound soil and atmospheric drought” (CSAD) events due to global warming. We examined the impacts and drivers of CO2 fluxes during CSAD events at multiple layers of a deciduous forest over 18 years. Results showed reduced net ecosystem productivity and forest-floor respiration during CSAD events, mainly driven by soil and atmospheric drought. This unpredictability in forest CO2 fluxes jeopardises reforestation projects aimed at mitigating CO2 emissions.
Tamara Emmerichs, Yen-Sen Lu, and Domenico Taraborrelli
Biogeosciences, 21, 3251–3269, https://doi.org/10.5194/bg-21-3251-2024, https://doi.org/10.5194/bg-21-3251-2024, 2024
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We assess the representation of the plant response to surface water in a global atmospheric chemistry model. This sensitivity is crucial for the return of precipitation back into the atmosphere and thus significantly impacts the representation of weather as well as air quality. The newly implemented response function reduces this process and has a better comparison with satellite observations. This yields a higher intensity of unusual warm periods and higher production of air pollutants.
Nina L. H. Kinney, Charles A. Hepburn, Matthew I. Gibson, Daniel Ballesteros, and Thomas F. Whale
Biogeosciences, 21, 3201–3214, https://doi.org/10.5194/bg-21-3201-2024, https://doi.org/10.5194/bg-21-3201-2024, 2024
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Molecules released from plant pollen induce the formation of ice from supercooled water at temperatures warm enough to suggest an underlying function for this activity. In this study we show that ice nucleators are ubiquitous in pollen. We suggest the molecules responsible fulfil some unrelated biological function and nucleate ice incidentally. The ubiquity of ice-nucleating molecules in pollen and particularly active examples reveal a greater potential for pollen to impact weather and climate.
Max Gaber, Yanghui Kang, Guy Schurgers, and Trevor Keenan
Biogeosciences, 21, 2447–2472, https://doi.org/10.5194/bg-21-2447-2024, https://doi.org/10.5194/bg-21-2447-2024, 2024
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Gross primary productivity (GPP) describes the photosynthetic carbon assimilation, which plays a vital role in the carbon cycle. We can measure GPP locally, but producing larger and continuous estimates is challenging. Here, we present an approach to extrapolate GPP to a global scale using satellite imagery and automated machine learning. We benchmark different models and predictor variables and achieve an estimate that can capture 75 % of the variation in GPP.
Florian Wieland, Nadine Bothen, Ralph Schwidetzky, Teresa M. Seifried, Paul Bieber, Ulrich Pöschl, Konrad Meister, Mischa Bonn, Janine Fröhlich-Nowoisky, and Hinrich Grothe
EGUsphere, https://doi.org/10.5194/egusphere-2024-752, https://doi.org/10.5194/egusphere-2024-752, 2024
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Betula pendula is a widespread birch tree species containing ice nucleation agents that can trigger the freezing of cloud droplets, and thereby alter the evolution of clouds. Our study identifies three distinct ice-nucleating macromolecules (INMs) and aggregates of varying size that can nucleate ice at temperatures of up to -5.4 °C. Our findings suggest that these vegetation-derived particles may influence atmospheric processes, weather, and climate stronger than previously thought.
Sinikka J. Paulus, Rene Orth, Sung-Ching Lee, Anke Hildebrandt, Martin Jung, Jacob A. Nelson, Tarek Sebastian El-Madany, Arnaud Carrara, Gerardo Moreno, Matthias Mauder, Jannis Groh, Alexander Graf, Markus Reichstein, and Mirco Migliavacca
Biogeosciences, 21, 2051–2085, https://doi.org/10.5194/bg-21-2051-2024, https://doi.org/10.5194/bg-21-2051-2024, 2024
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Porous materials are known to reversibly trap water from the air, even at low humidity. However, this behavior is poorly understood for soils. In this analysis, we test whether eddy covariance is able to measure the so-called adsorption of atmospheric water vapor by soils. We find that this flux occurs frequently during dry nights in a Mediterranean ecosystem, while EC detects downwardly directed vapor fluxes. These results can help to map moisture uptake globally.
Luana Krebs, Susanne Burri, Iris Feigenwinter, Mana Gharun, Philip Meier, and Nina Buchmann
Biogeosciences, 21, 2005–2028, https://doi.org/10.5194/bg-21-2005-2024, https://doi.org/10.5194/bg-21-2005-2024, 2024
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This study explores year-round forest-floor greenhouse gas (GHG) fluxes in a Swiss spruce forest. Soil temperature and snow depth affected forest-floor respiration, while CH4 uptake was linked to snow cover. Negligible N2O fluxes were observed. In 2022, a warm year, CO2 emissions notably increased. The study suggests rising forest-floor GHG emissions due to climate change, impacting carbon sink behavior. Thus, for future forest management, continuous year-round GHG flux measurements are crucial.
Simone Rodrigues, Glauber Cirino, Demerval Moreira, Andrea Pozzer, Rafael Palácios, Sung-Ching Lee, Breno Imbiriba, José Nogueira, Maria Isabel Vitorino, and George Vourlitis
Biogeosciences, 21, 843–868, https://doi.org/10.5194/bg-21-843-2024, https://doi.org/10.5194/bg-21-843-2024, 2024
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The radiative effects of atmospheric particles are still unknown for a wide variety of species and types of vegetation present in Amazonian biomes. We examined the effects of aerosols on solar radiation and their impacts on photosynthesis in an area of semideciduous forest in the southern Amazon Basin. Under highly smoky-sky conditions, our results show substantial photosynthetic interruption (20–70 %), attributed specifically to the decrease in solar radiation and leaf canopy temperature.
Ruben B. Schulte, Jordi Vilà-Guerau de Arellano, Susanna Rutledge-Jonker, Shelley van der Graaf, Jun Zhang, and Margreet C. van Zanten
Biogeosciences, 21, 557–574, https://doi.org/10.5194/bg-21-557-2024, https://doi.org/10.5194/bg-21-557-2024, 2024
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We analyzed measurements with the aim of finding relations between the surface atmosphere exchange of NH3 and the CO2 uptake and transpiration by vegetation. We found a high correlation of daytime NH3 emissions with both latent heat flux and photosynthetically active radiation. Very few simultaneous measurements of NH3, CO2 fluxes and meteorological variables exist at sub-diurnal timescales. This study paves the way to finding more robust relations between the NH3 exchange flux and CO2 uptake.
Alex Mavrovic, Oliver Sonnentag, Juha Lemmetyinen, Carolina Voigt, Nick Rutter, Paul Mann, Jean-Daniel Sylvain, and Alexandre Roy
Biogeosciences, 20, 5087–5108, https://doi.org/10.5194/bg-20-5087-2023, https://doi.org/10.5194/bg-20-5087-2023, 2023
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We present an analysis of soil CO2 emissions in boreal and tundra regions during the non-growing season. We show that when the soil is completely frozen, soil temperature is the main control on CO2 emissions. When the soil is around the freezing point, with a mix of liquid water and ice, the liquid water content is the main control on CO2 emissions. This study highlights that the vegetation–snow–soil interactions must be considered to understand soil CO2 emissions during the non-growing season.
Yuhao Cui, Eri Tachibana, Kimitaka Kawamura, and Yuzo Miyazaki
Biogeosciences, 20, 4969–4980, https://doi.org/10.5194/bg-20-4969-2023, https://doi.org/10.5194/bg-20-4969-2023, 2023
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Fatty alcohols (FAs) are major components of surface lipids in plant leaves and serve as surface-active aerosols. Our study on the aerosol size distributions in a forest suggests that secondary FAs (SFAs) originated from plant waxes and that leaf senescence status is likely an important factor controlling the size distribution of SFAs. This study provides new insights into the sources of primary biological aerosol particles (PBAPs) and their effects on the aerosol ice nucleation activity.
Joyson Ahongshangbam, Liisa Kulmala, Jesse Soininen, Yasmin Frühauf, Esko Karvinen, Yann Salmon, Anna Lintunen, Anni Karvonen, and Leena Järvi
Biogeosciences, 20, 4455–4475, https://doi.org/10.5194/bg-20-4455-2023, https://doi.org/10.5194/bg-20-4455-2023, 2023
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Urban vegetation is important for removing urban CO2 emissions and cooling. We studied the response of urban trees' functions (photosynthesis and transpiration) to a heatwave and drought at four urban green areas in the city of Helsinki. We found that tree water use was increased during heatwave and drought periods, but there was no change in the photosynthesis rates. The heat and drought conditions were severe at the local scale but were not excessive enough to restrict urban trees' functions.
Ryan Vella, Andrea Pozzer, Matthew Forrest, Jos Lelieveld, Thomas Hickler, and Holger Tost
Biogeosciences, 20, 4391–4412, https://doi.org/10.5194/bg-20-4391-2023, https://doi.org/10.5194/bg-20-4391-2023, 2023
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We investigated the effect of the El Niño–Southern Oscillation (ENSO) on biogenic volatile organic compound (BVOC) emissions from plants. ENSO events can cause a significant increase in these emissions, which have a long-term impact on the Earth's atmosphere. Persistent ENSO conditions can cause long-term changes in vegetation, resulting in even higher BVOC emissions. We link ENSO-induced emission anomalies with driving atmospheric and vegetational variables.
Nadav Bekin and Nurit Agam
Biogeosciences, 20, 3791–3802, https://doi.org/10.5194/bg-20-3791-2023, https://doi.org/10.5194/bg-20-3791-2023, 2023
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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.
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.
Cited articles
Andresen, C. G., Lawrence, D. M., Wilson, C. J., McGuire, A. D., Koven, C., Schaefer, K., Jafarov, E., Peng, S., Chen, X., Gouttevin, I., Burke, E., Chadburn, S., Ji, D., Chen, G., Hayes, D., and Zhang, W.: Soil moisture and hydrology projections of the permafrost region – a model intercomparison, The Cryosphere, 14, 445–459, https://doi.org/10.5194/tc-14-445-2020, 2020.
Bai, W., Xi, J., and Wang, G.: Effects of short-term warming and nitrogen
addition on CO2 emission during growing season in an alpine swamp
meadow ecosystem of Qinghai-Tibetan Plateau, Chin. J. Ecol., 38, 927–936,
https://doi.org/10.13292/j.1000-4890.201904.001, 2019.
Biskaborn, B. K., Smith, S. L., Noetzli, J., Matthes, H., Vieira, G.,
Streletskiy, D. A., Schoeneich, P., Romanovsky, V. E., Lewkowicz, A. G.,
Abramov, A., Allard, M., Boike, J., Cable, W. L., Christiansen, H. H.,
Delaloye, R., Diekmann, B., Drozdov, D., Etzelmuller, B., Grosse, G.,
Guglielmin, M., Ingeman-Nielsen, T., Isaksen, K., Ishikawa, M., Johansson,
M., Johannsson, H., Joo, A., Kaverin, D., Kholodov, A., Konstantinov, P.,
Kroger, T., Lambiel, C., Lanckman, J. P., Luo, D., Malkova, G., Meiklejohn,
I., Moskalenko, N., Oliva, M., Phillips, M., Ramos, M., Sannel, A. B. K.,
Sergeev, D., Seybold, C., Skryabin, P., Vasiliev, A., Wu, Q., Yoshikawa, K.,
Zheleznyak, M., and Lantuit, H.: Permafrost is warming at a global scale,
Nat. Commun., 10, 264, https://doi.org/10.1038/s41467-018-08240-4, 2019.
Bohn, T. J., Lettenmaier, D. P., Sathulur, K., Bowling, L. C., Podest, E.,
McDonald, K. C., and Friborg, T.: Methane emissions from western Siberian
wetlands: heterogeneity and sensitivity to climate change, Environ. Res.
Lett., 2, 045015, https://doi.org/10.1088/1748-9326/2/4/045015, 2007.
Breiman, L.: Random forests, Mach. Learn., 45, 5–32,
https://doi.org/10.1023/a:1010933404324, 2001.
Cao, S. K., Cao, G. C., Feng, Q., Han, G. Z., Lin, Y. Y., Yuan, J., Wu, F.
T., and Cheng, S. Y.: Alpine wetland ecosystem carbon sink and its controls
at the Qinghai Lake, Environ. Earth Sci., 76, 210,
https://doi.org/10.1007/s12665-017-6529-5, 2017.
Chai, X., Shi, P. L., Zong, N., Niu, B., He, Y. T., and Zhang, X. Z.:
Biophysical regulation of carbon flux in different rainfall regime in a
northern Tibetan alpine meadow, J. Resour. Ecol., 8, 30–41,
https://doi.org/10.5814/j.issn.1674-764x.2017.01.005, 2017.
Chen, D., Xu, B., Yao, T., Guo, Z., Cui, P., Chen, F., Zhang, R., Zhang, X.,
Zhang, Y., Fan, J., Hou, Z., and Zhang, T.: Assessment of past, present and
future environmental changes on the Tibetan Plateau, Chinese Sci. Bull., 60,
3025–3035, https://doi.org/10.1360/n972014-01370, 2015.
Cheng, Z., Liu, X., Fan, G., Bai, A., and Wang, B.: Spatiotemporal
Distribution of Climate Change over the Qinghai-Tibetan Plateau in 21st
Century, Arid Zone Res., 28, 669–676, 2011.
Chimner, R. A. and Cooper, D. J.: Influence of water table levels on
CO2 emissions in a Colorado subalpine fen: an in-situ microcosm study,
Soil Biol. Biochem., 35, 345–351,
https://doi.org/10.1016/s0038-0717(02)00284-5, 2003.
Christensen, T. R., Ekberg, A., Strom, L., Mastepanov, M., Panikov, N.,
Oquist, M., Svensson, B. H., Nykanen, H., Martikainen, P. J., and Oskarsson,
H.: Factors controlling large scale variations in methane emissions from
wetlands, Geophys. Res. Lett., 30, 1414, https://doi.org/10.1029/2002gl016848,
2003.
Foti, R., del Jesus, M., Rinaldo, A., and Rodriguez-Iturbe, I.: Signs of
critical transition in the Everglades wetlands in response to climate and
anthropogenic changes, P. Natl. Acad. Sci. USA, 110, 6296–6300,
https://doi.org/10.1073/pnas.1302558110, 2013.
Fu, G., Shen, Z.-X., Sun, W., Zhong, Z.-M., Zhang, X.-Z., and Zhou, Y.-T.: A
Meta-analysis of the Effects of Experimental Warming on Plant Physiology and
Growth on the Tibetan Plateau, J. Plant Growth Regul., 34, 57–65,
https://doi.org/10.1007/s00344-014-9442-0, 2015.
Fu, Y., Zheng, Z., Yu, G., Hu, Z., Sun, X., Shi, P., Wang, Y., and Zhao, X.: Environmental influences on carbon dioxide fluxes over three grassland ecosystems in China, Biogeosciences, 6, 2879–2893, https://doi.org/10.5194/bg-6-2879-2009, 2009.
Ganjurjav, H., Gao, Q., Gornish, E. S., Schwartz, M. W., Liang, Y., Cao, X.,
Zhang, W., Zhang, Y., Li, W., Wan, Y., Li, Y., Danjiu, L., Guo, H., and Lin,
E.: Differential response of alpine steppe and alpine meadow to climate
warming in the central Qinghai-Tibetan Plateau, Agr. Forest Meteorol., 223,
233–240, https://doi.org/10.1016/j.agrformet.2016.03.017, 2016.
Ganjurjav, H., Hu, G., Wan, Y., Li, Y., Danjiu, L., and Gao, Q.: Different
responses of ecosystem carbon exchange to warming in three types of alpine
grassland on the central Qinghai-Tibetan Plateau, Ecol. Evol., 8, 1507–1520,
https://doi.org/10.1002/ece3.3741, 2018.
Gao, Y., Quan, M. Y., Shen, W. D., and Ren, X. D.: Research on experimental
warming effects of CO2 emissions and environmental response mechanisms
in an alpine swamp meadow ecosystem on the Qinghai-Tibet Plateau, J. Guangxi
Uni. (Nat. Sci. Ed.), 44, 580–586,
https://doi.org/10.13624/j.cnki.issn.1001-7445.2019.0580, 2019.
Han, G., Yang, L., Yu, J., Wang, G., Mao, P., and Gao, Y.: Environmental
Controls on Net Ecosystem CO2 Exchange Over a Reed (Phragmites
australis) Wetland in the Yellow River Delta, China, Estuar. Coast, 36,
401–413, https://doi.org/10.1007/s12237-012-9572-1, 2013.
Hao, Y. B., Cui, X. Y., Wang, Y. F., Mei, X. R., Kang, X. M., Wu, N., Luo,
P., and Zhu, D.: Predominance of Precipitation and Temperature Controls on
Ecosystem CO2 Exchange in Zoige Alpine Wetlands of Southwest China,
Wetlands, 31, 413–422, https://doi.org/10.1007/s13157-011-0151-1, 2011.
Hruby, T.: Assessments of Wetland Functions: What They Are and What They Are
Not, Environ. Manage., 23, 75–85, https://doi.org/10.1007/s002679900168,
1999.
Jansson, J. K. and Hofmockel, K. S.: Soil microbiomes and climate change,
Nat. Rev. Microbiol., 18, 35–46, https://doi.org/10.1038/s41579-019-0265-7,
2020.
Kang, X., Wang, Y., Chen, H., Tian, J., Cui, X., Rui, Y., Zhong, L., Kardol,
P., Hao, Y., and Xiao, X.: Modeling Carbon Fluxes Using Multi-Temporal MODIS
Imagery and CO2 Eddy Flux Tower Data in Zoige Alpine Wetland,
South-West China, Wetlands, 34, 603–618,
https://doi.org/10.1007/s13157-014-0529-y, 2014.
Lafrenière, M. J. and Lamoureux, S. F.: Effects of changing permafrost
conditions on hydrological processes and fluvial fluxes, Earth-Sci. Rev.,
191, 212–223, https://doi.org/10.1016/j.earscirev.2019.02.018, 2019.
Li, C., He, H., Liu, M., Su, W., Fu, Y., Zhang, L., Wen, X., and Yu, G.: The
design and application of CO2 flux data processing system at ChinaFLUX,
Geo-Info. Sci., 10, 557–565,
https://doi.org/10.3969/j.issn.1560-8999.2008.05.002, 2008.
Li, C., Yang, Y., Li, X., Chen, Q., and Zhou, H.: Effects of Simulated
Climate Warming and Grazing on Photosynthesis and Respiration of Permafrost
Meadow Plant Community, Russ. J. Ecol+, 51, 224–232,
https://doi.org/10.1134/s1067413620030042, 2020.
Li, H., Nicotra, A. B., Xu, D., and Du, G.: Habitat-specific responses of
leaf traits to soil water conditions in species from a novel alpine swamp
meadow community, Conserv. Physiol., 3, cov046,
https://doi.org/10.1093/conphys/cov046, 2015.
Liu, D., Li, Y., Wang, T., Peylin, P., MacBean, N., Ciais, P., Jia, G., Ma,
M., Ma, Y., Shen, M., Zhang, X., and Piao, S.: Contrasting responses of
grassland water and carbon exchanges to climate change between Tibetan
Plateau and Inner Mongolia, Agr. Forest Meteorol., 249, 163–175,
https://doi.org/10.1016/j.agrformet.2017.11.034, 2018.
Liu, L., Wang, X., Lajeunesse, M. J., Miao, G., Piao, S., Wan, S., Wu, Y.,
Wang, Z., Yang, S., Li, P., and Deng, M.: A cross-biome synthesis of soil
respiration and its determinants under simulated precipitation changes,
Glob. Change Biol., 22, 1394–1405, https://doi.org/10.1111/gcb.13156, 2016.
Liu, S. M., Xu, Z. W., Wang, W. Z., Jia, Z. Z., Zhu, M. J., Bai, J., and Wang, J. M.: A comparison of eddy-covariance and large aperture scintillometer measurements with respect to the energy balance closure problem, Hydrol. Earth Syst. Sci., 15, 1291–1306, https://doi.org/10.5194/hess-15-1291-2011, 2011.
Liu, X. W., Zhu, D., Zhan, W., Chen, H., Zhu, Q. A., Hao, Y. B., Liu, W. J., and He, Y. X.: Five‐year measurements of net ecosystem
CO2 exchange at a fen in the Zoige peatlands on the Qinghai‐Tibetan Plateau, J. Geophys. Res.-Atmos., 124, 11803–11818, https://doi.org/10.1029/2019JD031429, 2019.
Liu, Y., Geng, X., Tenzintarchen, Wei, D., Dai, D., and Xu, R.: Divergence in
ecosystem carbon fluxes and soil nitrogen characteristics across alpine
steppe, alpine meadow and alpine swamp ecosystems in a biome transition
zone, Sci. Total Environ., 748, 142453, https://doi.org/10.1016/j.scitotenv.2020.142453,
2020.
Lloyd, J. and Taylor, J. A.: On the Temperature-Dependence of Soil
Respiration, Funct. Ecol., 8, 315–323, https://doi.org/10.2307/2389824,
1994.
López-Blanco, E., Lund, M., Williams, M., Tamstorf, M. P., Westergaard-Nielsen, A., Exbrayat, J.-F., Hansen, B. U., and Christensen, T. R.: Exchange of CO2 in Arctic tundra: impacts of meteorological variations and biological disturbance, Biogeosciences, 14, 4467–4483, https://doi.org/10.5194/bg-14-4467-2017, 2017.
López-Blanco, E., Lund, M., Christensen, T. R., Tamstorf, M. P.,
Smallman, T. L., Slevin, D., Westergaard-Nielsen, A., Hansen, B. U.,
Abermann, J., and Williams, M.: Plant Traits are Key Determinants in
Buffering the Meteorological Sensitivity of Net Carbon Exchanges of Arctic
Tundra, J. Geophys. Res.-Biogeo., 123, 2675–2694,
https://doi.org/10.1029/2018jg004386, 2018.
López-Blanco, E., Jackowicz-Korczynski, M., Mastepanov, M., Skov, K.,
Westergaard-Nielsen, A., Williams, M., and Christensen, T. R.: Multi-year
data-model evaluation reveals the importance of nutrient availability over
climate in arctic ecosystem C dynamics, Environ. Res. Lett., 15, 094007,
https://doi.org/10.1088/1748-9326/ab865b, 2020.
Moffat, A. M., Papale, D., Reichstein, M., Hollinger, D. Y., Richardson, A.
D., Barr, A. G., Beckstein, C., Braswell, B. H., Churkina, G., Desai, A. R.,
Falge, E., Gove, J. H., Heimann, M., Hui, D., Jarvis, A. J., Kattge, J.,
Noormets, A., and Stauch, V. J.: Comprehensive comparison of gap-filling
techniques for eddy covariance net carbon fluxes, Agr. Forest Meteorol.,
147, 209–232, https://doi.org/10.1016/j.agrformet.2007.08.011, 2007.
Niu, B., He, Y., Zhang, X., Du, M., Shi, P., Sun, W., and Zhang, L.:
CO2 Exchange in an Alpine Swamp Meadow on the Central Tibetan Plateau,
Wetlands, 37, 525–543, https://doi.org/10.1007/s13157-017-0888-2, 2017.
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.
Pedregosa, F., Varoquaux, G., Gramfort, A., Michel, V., Thirion, B., Grisel,
O., Blondel, M., Prettenhofer, P., Weiss, R., Dubourg, V., Vanderplas, J.,
Passos, A., Cournapeau, D., Brucher, M., Perrot, M., and Duchesnay, E.:
Scikit-learn: Machine Learning in Python, J. Mach. Learn. Res., 12,
2825–2830, 2011.
Peng, F., You, Q., Xu, M., Guo, J., Wang, T., and Xue, X.: Effects of
Warming and Clipping on Ecosystem Carbon Fluxes across Two Hydrologically
Contrasting Years in an Alpine Meadow of the Qinghai-Tibet Plateau, Plos
One, 9, 109319, https://doi.org/10.1371/journal.pone.0109319, 2014.
Qi, Y., Wei, D., Zhao, H., and Wang, X.: Carbon Sink of a Very High
Marshland on the Tibetan Plateau, J. Geophys. Res.-Biogeo., 126, e2020JG006235,
https://doi.org/10.1029/2020jg006235, 2021.
Quan, Q., Tian, D., Luo, Y., Zhang, F., Crowther, T. W., Zhu, K., Chen, H.
Y. H., Zhou, Q., and Niu, S.: Water scaling of ecosystem carbon cycle
feedback to climate warming, Sci. Adv., 5, eaav1131,
https://doi.org/10.1126/sciadv.aav1131, 2019.
Reichstein, M., Falge, E., Baldocchi, D., Papale, D., Aubinet, M.,
Berbigier, P., Bernhofer, C., Buchmann, N., Gilmanov, T., Granier, A.,
Grunwald, T., Havrankova, K., Ilvesniemi, H., Janous, D., Knohl, A.,
Laurila, T., Lohila, A., Loustau, D., Matteucci, G., Meyers, T., Miglietta,
F., Ourcival, J. M., Pumpanen, J., Rambal, S., Rotenberg, E., Sanz, M.,
Tenhunen, J., Seufert, G., Vaccari, F., Vesala, T., Yakir, D., and
Valentini, R.: On the separation of net ecosystem exchange into assimilation
and ecosystem respiration: review and improved algorithm, Glob. Change
Biol., 11, 1424–1439, https://doi.org/10.1111/j.1365-2486.2005.001002.x,
2005.
Reichstein, M., Moffat, A. M., Wutzler, T., and Sickel, K.: REddyProc: Data
processing and plotting utilities of (half-)hourly eddy-covariance
measurements, R package version 0.8-2/r14, https://R-Forge.R-project.org/projects/reddyproc/ (last access: 6 February 2022), 2016.
Saito, M., Kato, T., and Tang, Y.: Temperature controls ecosystem CO2
exchange of an alpine meadow on the northeastern Tibetan Plateau, Glob.
Change Biol., 15, 221–228, https://doi.org/10.1111/j.1365-2486.2008.01713.x,
2009.
Schuur, E. A. G., Vogel, J. G., Crummer, K. G., Lee, H., Sickman, J. O., and
Osterkamp, T. E.: The effect of permafrost thaw on old carbon release and
net carbon exchange from tundra, Nature, 459, 556–559,
https://doi.org/10.1038/nature08031, 2009.
Song, C. C., Sun, L., Huang, Y., Wang, Y. S., and Wan, Z. M.: Carbon exchange in
a freshwater marsh in the Sanjiang Plain, northeastern China, Agr. Forest
Meteorol., 151, 1131–1138, https://doi.org/10.1016/j.agrformet.2011.04.001,
2011.
Sun, S., Che, T., Gentine, P., Chen, Q., Wang, L., Yan, Z., Chen, B., and
Song, Z.: Shallow groundwater inhibits soil respiration and favors carbon
uptake in a wet alpine meadow ecosystem, Agr. Forest Meteorol., 297, 108254,
https://doi.org/10.1016/j.agrformet.2020.108254, 2021.
Taylor, P. G., Cleveland, C. C., Wieder, W. R., Sullivan, B. W., Doughty, C.
E., Dobrowski, S. Z., and Townsend, A. R.: Temperature and rainfall interact
to control carbon cycling in tropical forests, Ecol. Lett., 20, 779–788,
https://doi.org/10.1111/ele.12765, 2017.
Wang, D., Wang, K., Zheng, X., Butterbach-Bahl, K., Diaz-Pines, E., and
Chen, H.: Applicability of a gas analyzer with dual quantum cascade lasers
for simultaneous measurements of N2O, CH4 and CO2 fluxes from cropland
using the eddy covariance technique, Sci. Total Environ., 729, 138784,
https://doi.org/10.1016/j.scitotenv.2020.138784, 2020.
Wang, H., Yu, L., Chen, L., Wang, C., and He, J.: Responses of soil
respiration to reduced water table and nitrogen addition in an alpine
wetland on the Qinghai-Xizang Plateau, Chin. J. Plant Ecol., 38, 619–625,
https://doi.org/10.3724/SP.J.1258.2014.00057, 2014.
Wang, L., Liu, H., Sun, J., and Shao, Y.: Biophysical effects on the interannual variation in carbon dioxide exchange of an alpine meadow on the Tibetan Plateau, Atmos. Chem. Phys., 17, 5119–5129, https://doi.org/10.5194/acp-17-5119-2017, 2017.
Wang, L., Liu, H., Shao, Y., Liu, Y., and Sun, J.: Water and CO2 fluxes
over semiarid alpine steppe and humid alpine meadow ecosystems on the
Tibetan Plateau, Theor. Appl. Climatol., 131, 547–556,
https://doi.org/10.1007/s00704-016-1997-1, 2018.
Wang, Y., Zhu, Z., Ma, Y., and Yuan, L.: Carbon and water fluxes in an
alpine steppe ecosystem in the Nam Co area of the Tibetan Plateau during two
years with contrasting amounts of precipitation, Int. J. Biometeorol., 64,
1183–1196, https://doi.org/10.1007/s00484-020-01892-2, 2020.
Webb, E. K., Pearman, G. I., and Leuning, R.: Correction of Flux
Measurements for Density Effects Due to Heat and Water-Vapor Transfer, Q. J.
Roy. Meteor. Soc., 106, 85–100, https://doi.org/10.1002/qj.49710644707,
1980.
Wei, D., Qi, Y. H., Ma, Y. M., Wang, X. F., Ma, W. Q., Gao, T. G., H, L., Zhao, H.,
Zhang, J. X., and Wang, X. D.: Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan
Plateau, P. Natl. Acad. Sci. USA, 118, e2015283118, https://doi.org/10.1073/pnas.2015283118, 2021.
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.
Woodward, R. T. and Wui, Y. S.: The economic value of wetland services: a
meta-analysis, Ecol. Econ., 37, 257–270,
https://doi.org/10.1016/s0921-8009(00)00276-7, 2001.
Wu, F., Cao, S., Cao, G., Han, G., Lin, Y., and Cheng, S.: Variation of
CO2 Flux of Alpine Wetland Ecosystem of Kobresia tibetica Wet Meadow in
Lake Qinghai, J. Ecol. Rural Environ., 34, 124–131,
https://doi.org/10.11934/j.issn.1673-4831.2018.02.004, 2018.
Wu, H., Zhao, G., Li, X. Y., Wang, Y., He, B., Jiang, Z., Zhang, S., and
Sun, W.: Identifying water sources used by alpine riparian plants in a
restoration zone on the Qinghai-Tibet Plateau: Evidence from stable
isotopes, Sci. Total Environ., 697, 134092,
https://doi.org/10.1016/j.scitotenv.2019.134092, 2019.
Wu, J., Wu, H., Ding, Y., Qin, J., and Zeng, D.: Interannual and seasonal
variations in carbon exchanges over an alpine meadow in the northeastern
edge of the Qinghai-Tibet Plateau, China, PloS one, 15, e0228470,
https://doi.org/10.1371/journal.pone.0228470, 2020.
Wu, L., Gu, S., Zhao, L., Xu, S., Zhou, H., Feng, C., Xu, W.-X., Li, Y.,
Zhao, X., and Tang, Y.: Variation in net CO2 exchange, gross primary
production and its affecting factors in the planted pasture ecosystem in
Sanjiangyuan Region of the Qinghai-Tibetan Plateau of China, Chin. J. Plant
Ecol., 34, 521–528, https://doi.org/10.3724/SP.J.1142.2010.40521, 2010.
Wu, Z., Dijkstra, P., Koch, G. W., Penuelas, J., and Hungate, B. A.:
Responses of terrestrial ecosystems to temperature and precipitation change:
a meta-analysis of experimental manipulation, Glob. Change Biol., 17,
927–942, https://doi.org/10.1111/j.1365-2486.2010.02302.x, 2011.
Yu, G. R., Zhu, X. J., Fu, Y. L., He, H. L., Wang, Q. F., Wen, X. F., Li, X. R., Zhang, L. M., Zhang, L., Su, W., Li, S. G., Sun, X. M., Zhang, Y. P., Zhang, J. H., Yan, J. H., Wang, H. M., Zhou, G. S., Jia, B. R., Xiang, W. H., Li, Y. N., Zhao, L., Wang, Y. F., Shi, P. L., Chen, S. P., Xin, X. P., Zhao, F. H., Wang, Y. Y., and Tong, C. L.: Spatial patterns and climate drivers of carbon fluxes in terrestrial ecosystems of China, Glob.
Change
Biol., 19, 798–810, https://doi.org/10.1111/gcb.12079, 2013.
Yu, L., Wang, H., Wang, Y., Zhang, Z., Chen, L., Liang, N., and He, J.-S.:
Temporal variation in soil respiration and its sensitivity to temperature
along a hydrological gradient in an alpine wetland of the Tibetan Plateau,
Agr. Forest Meteorol., 282–283, 107854, https://doi.org/10.1016/j.agrformet.2019.107854,
2020.
Zeng, J., Matsunaga, T., Tan, Z. H., Saigusa, N., Shirai, T., Tang, Y.,
Peng, S., and Fukuda, Y.: Global terrestrial carbon fluxes of 1999–2019
estimated by upscaling eddy covariance data with a random forest, Sci. Data,
7, 313, https://doi.org/10.1038/s41597-020-00653-5, 2020.
Zhang, G., Zhang, Y., Dong, J., and Xiao, X.: Green-up dates in the Tibetan
Plateau have continuously advanced from 1982 to 2011, P. Natl. Acad. Sci.
USA, 110, 4309–4314, https://doi.org/10.1073/pnas.1210423110, 2013.
Zhang, H., Wu, P., Yin, A., Yang, X., Zhang, M., and Gao, C.: Prediction of
soil organic carbon in an intensively managed reclamation zone of eastern
China: A comparison of multiple linear regressions and the random forest
model, Sci. Total Environ., 592, 704–713,
https://doi.org/10.1016/j.scitotenv.2017.02.146, 2017.
Zhang, S. Y.: Energy partitioning and evapotranspiration over the typical
ecosystems in the Qinghai Lake watershed, PhD thesis, College of Resources
Science and Technology, Beijing Normal University, China, 115 pp., 2014 (n Chinese with English abstract).
Zhang, S.-Y., Li, X.-Y., Zhao, G.-Q., and Huang, Y.-M.: Surface energy
fluxes and controls of evapotranspiration in three alpine ecosystems of
Qinghai Lake watershed, NE Qinghai-Tibet Plateau, Ecohydrology, 9, 267–279,
https://doi.org/10.1002/eco.1633, 2016.
Zhang, T., Zhang, Y., Xu, M., Zhu, J., Chen, N., Jiang, Y., Huang, K., Zu,
J., Liu, Y., and Yu, G.: Water availability is more important than
temperature in driving the carbon fluxes of an alpine meadow on the Tibetan
Plateau, Agr. Forest Meteorol., 256, 22–31,
https://doi.org/10.1016/j.agrformet.2018.02.027, 2018.
Zhao, J., Luo, T., Wei, H., Deng, Z., Li, X., Li, R., and Tang, Y.:
Increased precipitation offsets the negative effect of warming on plant
biomass and ecosystem respiration in a Tibetan alpine steppe, Agr. Forest
Meteorol., 279, 107761, https://doi.org/10.1016/j.agrformet.2019.107761, 2019.
Zhao, L., Li, Y. N., Zhao, X. Q., Xu, S. X., Tang, Y. H., Yu, G. R., Gu, S.,
Du, M. Y., and Wang, Q. X.: Comparative study of the net exchange of
CO2 in 3 types of vegetation ecosystems on the Qinghai-Tibetan Plateau,
Chinese Sci. Bull., 50, 1767–1774, https://doi.org/10.1360/04wd0316, 2005.
Zhao, L., Li, Y., Xu, S., Zhou, H., Gu, S., Yu, G., and Zhao, X.: Diurnal,
seasonal and annual variation in net ecosystem CO2 exchange of an
alpine shrubland on Qinghai-Tibetan plateau, Glob. Change Biol., 12,
1940–1953, https://doi.org/10.1111/j.1365-2486.2006.01197.x, 2006.
Zhao, L., Li, J., Xu, S., Zhou, H., Li, Y., Gu, S., and Zhao, X.: Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau, Biogeosciences, 7, 1207–1221, https://doi.org/10.5194/bg-7-1207-2010, 2010.
Zhao, L., Hu, G., Zou, D., Wu, X., Ma, L., Sun, Z., Yuan, L., Zhou, H., and
Liu, S.: Permafrost changes and its effects on hydrological processes on
Qinghai-Tibet Plateau, Bull. Chin. Acad. Sci. (Chinese Version), 34,
1233–1246, https://doi.org/10.16418/j.issn.1000-3045.2019.11.006, 2019.
Zhu, J., Zhang, Y., and Jiang, L.: Experimental warming drives a seasonal
shift of ecosystem carbon exchange in Tibetan alpine meadow, Agr. Forest
Meteorol., 233, 242–249, https://doi.org/10.1016/j.agrformet.2016.12.005,
2017.
Zhu, J., Zhang, F., Li, H., He, H., Li, Y., Yang, Y., Zhang, G., Wang, C.,
and Luo, F.: Seasonal and Interannual Variations of CO2 Fluxes Over 10
Years in an Alpine Wetland on the Qinghai-Tibetan Plateau, J. Geophys.
Res.-Biogeo., 125, e2020JG006011, https://doi.org/10.1029/2020jg006011, 2020.
Zhu, X., Song, C., Swarzenski, C. M., Guo, Y., Zhang, X., and Wang, J.:
Ecosystem-atmosphere exchange of CO2 in a temperate herbaceous peatland
in the Sanjiang Plain of northeast China, Ecol. Eng., 75, 16–23,
https://doi.org/10.1016/j.ecoleng.2014.11.035, 2015.
Zhu, Z., Ma, Y., Li, M., Hu, Z., Xu, C., Zhang, L., Han, C., Wang, Y., and
Ichiro, T.: Carbon dioxide exchange between an alpine steppe ecosystem and
the atmosphere on the Nam Co area of the Tibetan Plateau, Agr. Forest
Meteorol., 203, 169–179, https://doi.org/10.1016/j.agrformet.2014.12.013,
2015.
Short summary
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.
Although water availability has been linked to the response of ecosystem carbon (C) sink–source...
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