Articles | Volume 15, issue 6
https://doi.org/10.5194/bg-15-1775-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/bg-15-1775-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Mar 2018
Research article |
| 26 Mar 2018
| 26 Mar 2018
Carbon dioxide emissions from the flat bottom and shallow Nam Theun 2 Reservoir: drawdown area as a neglected pathway to the atmosphere
Chandrashekhar Deshmukh
Géosciences Environnement Toulouse (GET),
Université de Toulouse (UPS), 14 Avenue E. Belin, 31400 Toulouse,
France
Laboratoire d'Aérologie, Université de Toulouse,
CNRS UMR 5560, 14 Av. Edouard Belin, 31400, Toulouse,
France
Centre for Regulatory and Policy Research, TERI
University, New Delhi, India
now at: Asia Pacific Resources International Limited
(APRIL), Indonesia
Géosciences Environnement Toulouse (GET),
Université de Toulouse (UPS), 14 Avenue E. Belin, 31400 Toulouse,
France
IRD, UR 234, GET, 14 Avenue E. Belin, 31400, Toulouse,
France
Departamento de Geoquimica, Universidade Federal
Fluminense, Niterói, Brasil
Axay Vongkhamsao
Nam Theun 2 Power Company Limited (NTPC), Environment &
Social Division, Water Quality and Biodiversity Dept., Gnommalath Office,
P.O. Box 5862, Vientiane, Lao PDR
Sylvie Pighini
Nam Theun 2 Power Company Limited (NTPC), Environment &
Social Division, Water Quality and Biodiversity Dept., Gnommalath Office,
P.O. Box 5862, Vientiane, Lao PDR
now at: Innsbruck University, Institute of Ecology, 15
Sternwartestrasse, 6020 Innsbruck, Austria
now at: Foundation Edmund Mach,
FOXLAB-FEM, Via E. Mach 1, 38010 San Michele all'Adige,
Italy
Phetdala Oudone
Nam Theun 2 Power Company Limited (NTPC), Environment &
Social Division, Water Quality and Biodiversity Dept., Gnommalath Office,
P.O. Box 5862, Vientiane, Lao PDR
now at: Department of Environmental Science, Faculty of
Environmental Sciences, National University of Laos, Vientiane, Lao
PDR
Saysoulinthone Sopraseuth
Nam Theun 2 Power Company Limited (NTPC), Environment &
Social Division, Water Quality and Biodiversity Dept., Gnommalath Office,
P.O. Box 5862, Vientiane, Lao PDR
Arnaud Godon
Nam Theun 2 Power Company Limited (NTPC), Environment &
Social Division, Water Quality and Biodiversity Dept., Gnommalath Office,
P.O. Box 5862, Vientiane, Lao PDR
now at: Arnaud Godon Company, 44 Route de Genas, Nomade
Lyon, 69003 Lyon, France
Wanidaporn Rode
Nam Theun 2 Power Company Limited (NTPC), Environment &
Social Division, Water Quality and Biodiversity Dept., Gnommalath Office,
P.O. Box 5862, Vientiane, Lao PDR
Pierre Guédant
Nam Theun 2 Power Company Limited (NTPC), Environment &
Social Division, Water Quality and Biodiversity Dept., Gnommalath Office,
P.O. Box 5862, Vientiane, Lao PDR
Priscia Oliva
Géosciences Environnement Toulouse (GET),
Université de Toulouse (UPS), 14 Avenue E. Belin, 31400 Toulouse,
France
Stéphane Audry
Géosciences Environnement Toulouse (GET),
Université de Toulouse (UPS), 14 Avenue E. Belin, 31400 Toulouse,
France
Cyril Zouiten
Géosciences Environnement Toulouse (GET),
Université de Toulouse (UPS), 14 Avenue E. Belin, 31400 Toulouse,
France
Corinne Galy-Lacaux
Laboratoire d'Aérologie, Université de Toulouse,
CNRS UMR 5560, 14 Av. Edouard Belin, 31400, Toulouse,
France
Henri Robain
IRD, iEES-Paris, Centre IRD France-Nord, 32 avenue Henri
Varagnat, 93143 Bondy CEDEX, France
Olivier Ribolzi
Géosciences Environnement Toulouse (GET),
Université de Toulouse (UPS), 14 Avenue E. Belin, 31400 Toulouse,
France
Arun Kansal
Centre for Regulatory and Policy Research, TERI
University, New Delhi, India
Vincent Chanudet
Electriciteì de France, Hydro Engineering Centre,
Sustainable Development Dpt., Savoie Technolac, 73373 Le Bourget du Lac,
France
Stéphane Descloux
Electriciteì de France, Hydro Engineering Centre,
Sustainable Development Dpt., Savoie Technolac, 73373 Le Bourget du Lac,
France
Dominique Serça
Laboratoire d'Aérologie, Université de Toulouse,
CNRS UMR 5560, 14 Av. Edouard Belin, 31400, Toulouse,
France
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Hydrol. Earth Syst. Sci., 27, 837–859, https://doi.org/10.5194/hess-27-837-2023, https://doi.org/10.5194/hess-27-837-2023, 2023
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The long-term effects of climate change will include an increase in lake surface and deep water temperatures. Incorporating up to 6 decades of limnological monitoring into an improved 1D lake model approach allows us to predict the thermal regime and oxygen solubility in four peri-alpine lakes over the period 1850–2100. Our modeling approach includes a revised selection of forcing variables and provides a way to investigate the impacts of climate variations on lakes for centennial timescales.
Simon Cazaurang, Manuel Marcoux, Oleg S. Pokrovsky, Sergey V. Loiko, Artem G. Lim, Stéphane Audry, Liudmila S. Shirokova, and Laurent Orgogozo
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Moss, lichen and peat samples are reconstructed using X-ray tomography. Most samples can be cut down to a representative volume based on porosity. However, only homogeneous samples could be reduced to a representative volume based on hydraulic conductivity. For heterogeneous samples, a devoted pore network model is computed. The studied samples are mostly highly porous and water-conductive. These results must be put into perspective with compressibility phenomena occurring in field tests.
Laurie Boithias, Olivier Ribolzi, Emma Rochelle-Newall, Chanthanousone Thammahacksa, Paty Nakhle, Bounsamay Soulileuth, Anne Pando-Bahuon, Keooudone Latsachack, Norbert Silvera, Phabvilay Sounyafong, Khampaseuth Xayyathip, Rosalie Zimmermann, Sayaphet Rattanavong, Priscia Oliva, Thomas Pommier, Olivier Evrard, Sylvain Huon, Jean Causse, Thierry Henry-des-Tureaux, Oloth Sengtaheuanghoung, Nivong Sipaseuth, and Alain Pierret
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Moussa Moustapha, Loris Deirmendjian, David Sebag, Jean-Jacques Braun, Stéphane Audry, Henriette Ateba Bessa, Thierry Adatte, Carole Causserand, Ibrahima Adamou, Benjamin Ngounou Ngatcha, and Frédéric Guérin
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Ather Abbas, Sangsoo Baek, Norbert Silvera, Bounsamay Soulileuth, Yakov Pachepsky, Olivier Ribolzi, Laurie Boithias, and Kyung Hwa Cho
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Correct estimation of fecal indicator bacteria in surface waters is critical for public health. Process-driven models and recently data-driven models have been applied for water quality modeling; however, a systematic comparison for simulation of E. coli is missing in the literature. We compared performance of process-driven (HSPF) and data-driven (LSTM) models for E. coli simulation. We show that LSTM can be an alternative to process-driven models for estimation of E. coli in surface waters.
Sekou Keita, Cathy Liousse, Véronique Yoboué, Pamela Dominutti, Benjamin Guinot, Eric-Michel Assamoi, Agnès Borbon, Sophie L. Haslett, Laetitia Bouvier, Aurélie Colomb, Hugh Coe, Aristide Akpo, Jacques Adon, Julien Bahino, Madina Doumbia, Julien Djossou, Corinne Galy-Lacaux, Eric Gardrat, Sylvain Gnamien, Jean F. Léon, Money Ossohou, E. Touré N'Datchoh, and Laurent Roblou
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Hydrol. Earth Syst. Sci., 20, 2691–2704, https://doi.org/10.5194/hess-20-2691-2016, https://doi.org/10.5194/hess-20-2691-2016, 2016
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Laos and Vietnam have switched from net forest loss to net forest expansion between 1990 and 2015. Based on long-term field measurements of land use, river flows, and weather data, we demonstrate that forest expansion can have extreme, yet opposite, impacts on water resources, depending on how the newly established tree-based cover is managed. The conversion of annual crops to teak plantations in Laos or to naturally regrowing forests in Vietnam led to increased and decreased flows, respectively.
Frédéric Guérin, Chandrashekhar Deshmukh, David Labat, Sylvie Pighini, Axay Vongkhamsao, Pierre Guédant, Wanidaporn Rode, Arnaud Godon, Vincent Chanudet, Stéphane Descloux, and Dominique Serça
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CO2 emissions of drained coastal peatlands in the Netherlands and potential emission reduction by water infiltration systems
Influence of wind strength and direction on diffusive methane fluxes and atmospheric methane concentrations above the North Sea
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Isotopomer labeling and oxygen dependence of hybrid nitrous oxide production
The emission of CO from tropical rainforest soils
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Modelling CO2 and N2O emissions from soils in silvopastoral systems of the West African Sahelian band
A case study on topsoil removal and rewetting for paludiculture: effect on biogeochemistry and greenhouse gas emissions from Typha latifolia, Typha angustifolia, and Azolla filiculoides
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Timescale dependence of airborne fraction and underlying climate–carbon-cycle feedbacks for weak perturbations in CMIP5 models
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Ralf C. H. Aben, Daniël van de Craats, Jim Boonman, Stijn H. Peeters, Bart Vriend, Coline C. F. Boonman, Ype van der Velde, Gilles Erkens, and Merit van den Berg
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Drained peatlands cause high CO2 emissions. We assessed the effectiveness of subsurface water infiltration systems (WISs) in reducing CO2 emissions related to increases in water table depth (WTD) on 12 sites for up to 4 years. Results show WISs markedly reduced emissions by 2.1 t CO2-C ha-1 yr-1. The relationship between the amount of carbon above the WTD and CO2 emission was stronger than the relationship between WTD and emission. Long-term monitoring is crucial for accurate emission estimates.
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Methane (CH4) is an important greenhouse gas and contributes to climate warming. However, the input of CH4 from coastal areas to the atmosphere is not well defined. Dissolved and atmospheric CH4 was determined at high spatial resolution in or above the North Sea. The atmospheric CH4 concentration was mainly influenced by wind direction. With our detailed study on the spatial distribution of CH4 fluxes we were able to provide a detailed and more realistic estimation of coastal CH4 fluxes.
Niu Zhu, Jinniu Wang, Dongliang Luo, Xufeng Wang, Cheng Shen, and Ning Wu
Biogeosciences, 21, 3509–3522, https://doi.org/10.5194/bg-21-3509-2024, https://doi.org/10.5194/bg-21-3509-2024, 2024
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Colette L. Kelly, Nicole M. Travis, Pascale Anabelle Baya, Claudia Frey, Xin Sun, Bess B. Ward, and Karen L. Casciotti
Biogeosciences, 21, 3215–3238, https://doi.org/10.5194/bg-21-3215-2024, https://doi.org/10.5194/bg-21-3215-2024, 2024
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Nitrous oxide, a potent greenhouse gas, accumulates in regions of the ocean that are low in dissolved oxygen. We used a novel combination of chemical tracers to determine how nitrous oxide is produced in one of these regions, the eastern tropical North Pacific Ocean. Our experiments showed that the two most important sources of nitrous oxide under low-oxygen conditions are denitrification, an anaerobic process, and a novel “hybrid” process performed by ammonia-oxidizing archaea.
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Carbon monoxide (CO) is regarded as an important indirect greenhouse gas. Soils can emit and take up CO, but, until now, uncertainty remains as to which process dominates in tropical rainforests. We present the first soil CO flux measurements from a tropical rainforest. Based on our observations, we report that tropical rainforest soils are a net source of CO. In addition, we show that valley streams and inundated areas are likely additional hot spots of CO in the ecosystem.
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EGUsphere, https://doi.org/10.5194/egusphere-2024-1562, https://doi.org/10.5194/egusphere-2024-1562, 2024
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Inland saline lakes are crucial in the global carbon cycle, but increased droughts may alter their carbon exchange capacity. We measured CO2 and CH4 fluxes in a Mediterranean saline lake using the Eddy Covariance method under dry and wet conditions. We found the lake acts as a carbon sink during wet periods but not during droughts. These results highlight the importance of saline lakes in carbon sequestration and their vulnerability to climate change-induced droughts.
Yélognissè Agbohessou, Claire Delon, Manuela Grippa, Eric Mougin, Daouda Ngom, Espoir Koudjo Gaglo, Ousmane Ndiaye, Paulo Salgado, and Olivier Roupsard
Biogeosciences, 21, 2811–2837, https://doi.org/10.5194/bg-21-2811-2024, https://doi.org/10.5194/bg-21-2811-2024, 2024
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Emissions of greenhouse gases in the Sahel are not well represented because they are considered weak compared to the rest of the world. However, natural areas in the Sahel emit carbon dioxide and nitrous oxides, which need to be assessed because of extended surfaces. We propose an assessment of such emissions in Sahelian silvopastoral systems and of how they are influenced by environmental characteristics. These results are essential to inform climate change strategies in the region.
Merit van den Berg, Thomas M. Gremmen, Renske J. E. Vroom, Jacobus van Huissteden, Jim Boonman, Corine J. A. van Huissteden, Ype van der Velde, Alfons J. P. Smolders, and Bas P. van de Riet
Biogeosciences, 21, 2669–2690, https://doi.org/10.5194/bg-21-2669-2024, https://doi.org/10.5194/bg-21-2669-2024, 2024
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Drained peatlands emit 3 % of the global greenhouse gas emissions. Paludiculture is a way to reduce CO2 emissions while at the same time generating an income for landowners. The side effect is the potentially high methane emissions. We found very high methane emissions for broadleaf cattail compared with narrowleaf cattail and water fern. The rewetting was, however, effective to stop CO2 emissions for all species. The highest potential to reduce greenhouse gas emissions had narrowleaf cattail.
Thea H. Heimdal, Galen A. McKinley, Adrienne J. Sutton, Amanda R. Fay, and Lucas Gloege
Biogeosciences, 21, 2159–2176, https://doi.org/10.5194/bg-21-2159-2024, https://doi.org/10.5194/bg-21-2159-2024, 2024
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Measurements of ocean carbon are limited in time and space. Machine learning algorithms are therefore used to reconstruct ocean carbon where observations do not exist. Improving these reconstructions is important in order to accurately estimate how much carbon the ocean absorbs from the atmosphere. In this study, we find that a small addition of observations from the Southern Ocean, obtained by autonomous sampling platforms, could significantly improve the reconstructions.
Guilherme L. Torres Mendonça, Julia Pongratz, and Christian H. Reick
Biogeosciences, 21, 1923–1960, https://doi.org/10.5194/bg-21-1923-2024, https://doi.org/10.5194/bg-21-1923-2024, 2024
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We study the timescale dependence of airborne fraction and underlying feedbacks by a theory of the climate–carbon system. Using simulations we show the predictive power of this theory and find that (1) this fraction generally decreases for increasing timescales and (2) at all timescales the total feedback is negative and the model spread in a single feedback causes the spread in the airborne fraction. Our study indicates that those are properties of the system, independently of the scenario.
François Clayer, Jan Erik Thrane, Kuria Ndungu, Andrew King, Peter Dörsch, and Thomas Rohrlack
Biogeosciences, 21, 1903–1921, https://doi.org/10.5194/bg-21-1903-2024, https://doi.org/10.5194/bg-21-1903-2024, 2024
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Determination of dissolved greenhouse gas (GHG) in freshwater allows us to estimate GHG fluxes. Mercuric chloride (HgCl2) is used to preserve water samples prior to GHG analysis despite its environmental and health impacts and interferences with water chemistry in freshwater. Here, we tested the effects of HgCl2, two substitutes and storage time on GHG in water from two boreal lakes. Preservation with HgCl2 caused overestimation of CO2 concentration with consequences for GHG flux estimation.
Helena Rautakoski, Mika Korkiakoski, Jarmo Mäkelä, Markku Koskinen, Kari Minkkinen, Mika Aurela, Paavo Ojanen, and Annalea Lohila
Biogeosciences, 21, 1867–1886, https://doi.org/10.5194/bg-21-1867-2024, https://doi.org/10.5194/bg-21-1867-2024, 2024
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Current and future nitrous oxide (N2O) emissions are difficult to estimate due to their high variability in space and time. Several years of N2O fluxes from drained boreal peatland forest indicate high importance of summer precipitation, winter temperature, and snow conditions in controlling annual N2O emissions. The results indicate increasing year-to-year variation in N2O emissions in changing climate with more extreme seasonal weather conditions.
Matthias Koschorreck, Norbert Kamjunke, Uta Koedel, Michael Rode, Claudia Schuetze, and Ingeborg Bussmann
Biogeosciences, 21, 1613–1628, https://doi.org/10.5194/bg-21-1613-2024, https://doi.org/10.5194/bg-21-1613-2024, 2024
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We measured the emission of carbon dioxide (CO2) and methane (CH4) from different sites at the river Elbe in Germany over 3 days to find out what is more important for quantification: small-scale spatial variability or diurnal temporal variability. We found that CO2 emissions were very different between day and night, while CH4 emissions were more different between sites. Dried out river sediments contributed to CO2 emissions, while the side areas of the river were important CH4 sources.
Odysseas Sifounakis, Edwin Haas, Klaus Butterbach-Bahl, and Maria P. Papadopoulou
Biogeosciences, 21, 1563–1581, https://doi.org/10.5194/bg-21-1563-2024, https://doi.org/10.5194/bg-21-1563-2024, 2024
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We performed a full assessment of the carbon and nitrogen cycles of a cropland ecosystem. An uncertainty analysis and quantification of all carbon and nitrogen fluxes were deployed. The inventory simulations include greenhouse gas emissions of N2O, NH3 volatilization and NO3 leaching from arable land cultivation in Greece. The inventory also reports changes in soil organic carbon and nitrogen stocks in arable soils.
Nathaniel B. Weston, Cynthia Troy, Patrick J. Kearns, Jennifer L. Bowen, William Porubsky, Christelle Hyacinthe, Christof Meile, Philippe Van Cappellen, and Samantha B. Joye
EGUsphere, https://doi.org/10.5194/egusphere-2024-448, https://doi.org/10.5194/egusphere-2024-448, 2024
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Nitrous oxide (N2O) is a potent greenhouse and ozone depleting gas produced largely from microbial nitrogen cycling processes, and human activities have resulted in increases in atmospheric N2O. We investigate the role of physical and chemical disturbance to soils and sediments. We demonstrate that the disturbance increases N2O production, the microbial community adapts to disturbance over time, an initial disturbance appears to confer resilience to subsequent disturbance.
Sarah M. Ludwig, Luke Schiferl, Jacqueline Hung, Susan M. Natali, and Roisin Commane
Biogeosciences, 21, 1301–1321, https://doi.org/10.5194/bg-21-1301-2024, https://doi.org/10.5194/bg-21-1301-2024, 2024
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Landscapes are often assumed to be homogeneous when using eddy covariance fluxes, which can lead to biases when calculating carbon budgets. In this study we report eddy covariance carbon fluxes from heterogeneous tundra. We used the footprints of each flux observation to unmix the fluxes coming from components of the landscape. We identified and quantified hot spots of carbon emissions in the landscape. Accurately scaling with landscape heterogeneity yielded half as much regional carbon uptake.
Sigrid Trier Kjær, Sebastian Westermann, Nora Nedkvitne, and Peter Dörsch
EGUsphere, https://doi.org/10.5194/egusphere-2024-562, https://doi.org/10.5194/egusphere-2024-562, 2024
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Permafrost peatlands are thawing due to climate change, releasing large quantities of carbon that degrades upon thawing and is released as CO2, CH4, or dissolved organic carbon (DOC). We incubated thawed Norwegian permafrost peat plateaus and thermokarst pond sediment found next to permafrost for up to 350 days to measure carbon loss. CO2 production was largest initially, while CH4 production increased over time. The largest carbon loss was measured at the top of the peat plateau core as DOC.
Zhao-Jun Yong, Wei‐Jen Lin, Chiao-Wen Lin, and Hsing-Juh Lin Lin
EGUsphere, https://doi.org/10.5194/egusphere-2024-533, https://doi.org/10.5194/egusphere-2024-533, 2024
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This study is the first to simultaneously measure mangrove CH4 emissions from both stems and soils throughout tidal cycles. The stems served as both net CO2 and CH4 sources. Compared to those of the soils, the stems exhibited markedly lower CH4 emissions, but no difference in CO2 emissions. Sampling only during low tides might overestimate the stem CO2 and CH4 emissions on a diurnal scale. This study also highlights species distinctness (with pneumatophores) in the emissions.
Justine Trémeau, Beñat Olascoaga, Leif Backman, Esko Karvinen, Henriikka Vekuri, and Liisa Kulmala
Biogeosciences, 21, 949–972, https://doi.org/10.5194/bg-21-949-2024, https://doi.org/10.5194/bg-21-949-2024, 2024
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We studied urban lawns and meadows in the Helsinki metropolitan area, Finland. We found that meadows are more resistant to drought events but that they do not increase carbon sequestration compared with lawns. Moreover, the transformation from lawns to meadows did not demonstrate any negative climate effects in terms of greenhouse gas emissions. Even though social and economic aspects also steer urban development, these results can guide planning to consider carbon-smart options.
Guantao Chen, Edzo Veldkamp, Muhammad Damris, Bambang Irawan, Aiyen Tjoa, and Marife D. Corre
Biogeosciences, 21, 513–529, https://doi.org/10.5194/bg-21-513-2024, https://doi.org/10.5194/bg-21-513-2024, 2024
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We established an oil palm management experiment in a large-scale oil palm plantation in Jambi, Indonesia. We recorded oil palm fruit yield and measured soil CO2, N2O, and CH4 fluxes. After 4 years of treatment, compared with conventional fertilization with herbicide weeding, reduced fertilization with mechanical weeding did not reduce yield and soil greenhouse gas emissions, which highlights the legacy effects of over a decade of conventional management prior to the start of the experiment.
Elizabeth Gachibu Wangari, Ricky Mwangada Mwanake, Tobias Houska, David Kraus, Gretchen Maria Gettel, Ralf Kiese, Lutz Breuer, and Klaus Butterbach-Bahl
Biogeosciences, 20, 5029–5067, https://doi.org/10.5194/bg-20-5029-2023, https://doi.org/10.5194/bg-20-5029-2023, 2023
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Agricultural landscapes act as sinks or sources of the greenhouse gases (GHGs) CO2, CH4, or N2O. Various physicochemical and biological processes control the fluxes of these GHGs between ecosystems and the atmosphere. Therefore, fluxes depend on environmental conditions such as soil moisture, soil temperature, or soil parameters, which result in large spatial and temporal variations of GHG fluxes. Here, we describe an example of how this variation may be studied and analyzed.
Laurie C. Menviel, Paul Spence, Andrew E. Kiss, Matthew A. Chamberlain, Hakase Hayashida, Matthew H. England, and Darryn Waugh
Biogeosciences, 20, 4413–4431, https://doi.org/10.5194/bg-20-4413-2023, https://doi.org/10.5194/bg-20-4413-2023, 2023
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As the ocean absorbs 25% of the anthropogenic emissions of carbon, it is important to understand the impact of climate change on the flux of carbon between the ocean and the atmosphere. Here, we use a very high-resolution ocean, sea-ice, carbon cycle model to show that the capability of the Southern Ocean to uptake CO2 has decreased over the last 40 years due to a strengthening and poleward shift of the southern hemispheric westerlies. This trend is expected to continue over the coming century.
Petr Znachor, Jiří Nedoma, Vojtech Kolar, and Anna Matoušů
Biogeosciences, 20, 4273–4288, https://doi.org/10.5194/bg-20-4273-2023, https://doi.org/10.5194/bg-20-4273-2023, 2023
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We conducted intensive spatial sampling of the hypertrophic fishpond to better understand the spatial dynamics of methane fluxes and environmental heterogeneity in fishponds. The diffusive fluxes of methane accounted for only a minor fraction of the total fluxes and both varied pronouncedly within the pond and over the studied summer season. This could be explained only by the water depth. Wind substantially affected temperature, oxygen and chlorophyll a distribution in the pond.
Sofie Sjögersten, Martha Ledger, Matthias Siewert, Betsabé de la Barreda-Bautista, Andrew Sowter, David Gee, Giles Foody, and Doreen S. Boyd
Biogeosciences, 20, 4221–4239, https://doi.org/10.5194/bg-20-4221-2023, https://doi.org/10.5194/bg-20-4221-2023, 2023
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Permafrost thaw in Arctic regions is increasing methane emissions, but quantification is difficult given the large and remote areas impacted. We show that UAV data together with satellite data can be used to extrapolate emissions across the wider landscape as well as detect areas at risk of higher emissions. A transition of currently degrading areas to fen type vegetation can increase emission by several orders of magnitude, highlighting the importance of quantifying areas at risk.
Cole G. Brachmann, Tage Vowles, Riikka Rinnan, Mats P. Björkman, Anna Ekberg, and Robert G. Björk
Biogeosciences, 20, 4069–4086, https://doi.org/10.5194/bg-20-4069-2023, https://doi.org/10.5194/bg-20-4069-2023, 2023
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Herbivores change plant communities through grazing, altering the amount of CO2 and plant-specific chemicals (termed VOCs) emitted. We tested this effect by excluding herbivores and studying the CO2 and VOC emissions. Herbivores reduced CO2 emissions from a meadow community and altered VOC composition; however, community type had the strongest effect on the amount of CO2 and VOCs released. Herbivores can mediate greenhouse gas emissions, but the effect is marginal and community dependent.
Ole Lessmann, Jorge Encinas Fernández, Karla Martínez-Cruz, and Frank Peeters
Biogeosciences, 20, 4057–4068, https://doi.org/10.5194/bg-20-4057-2023, https://doi.org/10.5194/bg-20-4057-2023, 2023
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Based on a large dataset of seasonally resolved methane (CH4) pore water concentrations in a reservoir's sediment, we assess the significance of CH4 emissions due to reservoir flushing. In the studied reservoir, CH4 emissions caused by one flushing operation can represent 7 %–14 % of the annual CH4 emissions and depend on the timing of the flushing operation. In reservoirs with high sediment loadings, regular flushing may substantially contribute to the overall CH4 emissions.
Matti Räsänen, Risto Vesala, Petri Rönnholm, Laura Arppe, Petra Manninen, Markus Jylhä, Jouko Rikkinen, Petri Pellikka, and Janne Rinne
Biogeosciences, 20, 4029–4042, https://doi.org/10.5194/bg-20-4029-2023, https://doi.org/10.5194/bg-20-4029-2023, 2023
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Fungus-growing termites recycle large parts of dead plant material in African savannas and are significant sources of greenhouse gases. We measured CO2 and CH4 fluxes from their mounds and surrounding soils in open and closed habitats. The fluxes scale with mound volume. The results show that emissions from mounds of fungus-growing termites are more stable than those from other termites. The soil fluxes around the mound are affected by the termite colonies at up to 2 m distance from the mound.
Tim René de Groot, Anne Margriet Mol, Katherine Mesdag, Pierre Ramond, Rachel Ndhlovu, Julia Catherine Engelmann, Thomas Röckmann, and Helge Niemann
Biogeosciences, 20, 3857–3872, https://doi.org/10.5194/bg-20-3857-2023, https://doi.org/10.5194/bg-20-3857-2023, 2023
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This study investigates methane dynamics in the Wadden Sea. Our measurements revealed distinct variations triggered by seasonality and tidal forcing. The methane budget was higher in warmer seasons but surprisingly high in colder seasons. Methane dynamics were amplified during low tides, flushing the majority of methane into the North Sea or releasing it to the atmosphere. Methanotrophic activity was also elevated during low tide but mitigated only a small fraction of the methane efflux.
Frederic Thalasso, Brenda Riquelme, Andrés Gómez, Roy Mackenzie, Francisco Javier Aguirre, Jorge Hoyos-Santillan, Ricardo Rozzi, and Armando Sepulveda-Jauregui
Biogeosciences, 20, 3737–3749, https://doi.org/10.5194/bg-20-3737-2023, https://doi.org/10.5194/bg-20-3737-2023, 2023
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A robust skirt-chamber design to capture and quantify greenhouse gas emissions from peatlands is presented. Compared to standard methods, this design improves the spatial resolution of field studies in remote locations while minimizing intrusion.
Gesa Schulz, Tina Sanders, Yoana G. Voynova, Hermann W. Bange, and Kirstin Dähnke
Biogeosciences, 20, 3229–3247, https://doi.org/10.5194/bg-20-3229-2023, https://doi.org/10.5194/bg-20-3229-2023, 2023
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Nitrous oxide (N2O) is an important greenhouse gas. However, N2O emissions from estuaries underlie significant uncertainties due to limited data availability and high spatiotemporal variability. We found the Elbe Estuary (Germany) to be a year-round source of N2O, with the highest emissions in winter along with high nitrogen loads. However, in spring and summer, N2O emissions did not decrease alongside lower nitrogen loads because organic matter fueled in situ N2O production along the estuary.
Alex Mavrovic, Oliver Sonnentag, Juha Lemmetyinen, Jennifer L. Baltzer, Christophe Kinnard, and Alexandre Roy
Biogeosciences, 20, 2941–2970, https://doi.org/10.5194/bg-20-2941-2023, https://doi.org/10.5194/bg-20-2941-2023, 2023
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This review supports the integration of microwave spaceborne information into carbon cycle science for Arctic–boreal regions. The microwave data record spans multiple decades with frequent global observations of soil moisture and temperature, surface freeze–thaw cycles, vegetation water storage, snowpack properties, and land cover. This record holds substantial unexploited potential to better understand carbon cycle processes.
Zoé Rehder, Thomas Kleinen, Lars Kutzbach, Victor Stepanenko, Moritz Langer, and Victor Brovkin
Biogeosciences, 20, 2837–2855, https://doi.org/10.5194/bg-20-2837-2023, https://doi.org/10.5194/bg-20-2837-2023, 2023
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We use a new model to investigate how methane emissions from Arctic ponds change with warming. We find that emissions increase substantially. Under annual temperatures 5 °C above present temperatures, pond methane emissions are more than 3 times higher than now. Most of this increase is caused by an increase in plant productivity as plants provide the substrate microbes used to produce methane. We conclude that vegetation changes need to be included in predictions of pond methane emissions.
Julian Koch, Lars Elsgaard, Mogens H. Greve, Steen Gyldenkærne, Cecilie Hermansen, Gregor Levin, Shubiao Wu, and Simon Stisen
Biogeosciences, 20, 2387–2403, https://doi.org/10.5194/bg-20-2387-2023, https://doi.org/10.5194/bg-20-2387-2023, 2023
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Utilizing peatlands for agriculture leads to large emissions of greenhouse gases worldwide. The emissions are triggered by lowering the water table, which is a necessary step in order to make peatlands arable. Many countries aim at reducing their emissions by restoring peatlands, which can be achieved by stopping agricultural activities and thereby raising the water table. We estimate a total emission of 2.6 Mt CO2-eq for organic-rich peatlands in Denmark and a potential reduction of 77 %.
Mélissa Laurent, Matthias Fuchs, Tanja Herbst, Alexandra Runge, Susanne Liebner, and Claire C. Treat
Biogeosciences, 20, 2049–2064, https://doi.org/10.5194/bg-20-2049-2023, https://doi.org/10.5194/bg-20-2049-2023, 2023
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In this study we investigated the effect of different parameters (temperature, landscape position) on the production of greenhouse gases during a 1-year permafrost thaw experiment. For very similar carbon and nitrogen contents, our results show a strong heterogeneity in CH4 production, as well as in microbial abundance. According to our study, these differences are mainly due to the landscape position and the hydrological conditions established as a result of the topography.
Michael Moubarak, Seeta Sistla, Stefano Potter, Susan M. Natali, and Brendan M. Rogers
Biogeosciences, 20, 1537–1557, https://doi.org/10.5194/bg-20-1537-2023, https://doi.org/10.5194/bg-20-1537-2023, 2023
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Tundra wildfires are increasing in frequency and severity with climate change. We show using a combination of field measurements and computational modeling that tundra wildfires result in a positive feedback to climate change by emitting significant amounts of long-lived greenhouse gasses. With these effects, attention to tundra fires is necessary for mitigating climate change.
Hanna I. Campen, Damian L. Arévalo-Martínez, and Hermann W. Bange
Biogeosciences, 20, 1371–1379, https://doi.org/10.5194/bg-20-1371-2023, https://doi.org/10.5194/bg-20-1371-2023, 2023
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Carbon monoxide (CO) is a climate-relevant trace gas emitted from the ocean. However, oceanic CO cycling is understudied. Results from incubation experiments conducted in the Fram Strait (Arctic Ocean) indicated that (i) pH did not affect CO cycling and (ii) enhanced CO production and consumption were positively correlated with coloured dissolved organic matter and nitrate concentrations. This suggests microbial CO uptake to be the driving factor for CO cycling in the Arctic Ocean.
Yihong Zhu, Ruihua Liu, Huai Zhang, Shaoda Liu, Zhengfeng Zhang, Fei-Hai Yu, and Timothy G. Gregoire
Biogeosciences, 20, 1357–1370, https://doi.org/10.5194/bg-20-1357-2023, https://doi.org/10.5194/bg-20-1357-2023, 2023
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With global warming, the risk of flooding is rising, but the response of the carbon cycle of aquatic and associated riparian systems
to flooding is still unclear. Based on the data collected in the Lijiang, we found that flooding would lead to significant carbon emissions of fluvial areas and riparian areas during flooding, but carbon capture may happen after flooding. In the riparian areas, the surviving vegetation, especially clonal plants, played a vital role in this transformation.
Lauri Heiskanen, Juha-Pekka Tuovinen, Henriikka Vekuri, Aleksi Räsänen, Tarmo Virtanen, Sari Juutinen, Annalea Lohila, Juha Mikola, and Mika Aurela
Biogeosciences, 20, 545–572, https://doi.org/10.5194/bg-20-545-2023, https://doi.org/10.5194/bg-20-545-2023, 2023
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We measured and modelled the CO2 and CH4 fluxes of the terrestrial and aquatic ecosystems of the subarctic landscape for 2 years. The landscape was an annual CO2 sink and a CH4 source. The forest had the largest contribution to the landscape-level CO2 sink and the peatland to the CH4 emissions. The lakes released 24 % of the annual net C uptake of the landscape back to the atmosphere. The C fluxes were affected most by the rainy peak growing season of 2017 and the drought event in July 2018.
Artem G. Lim, Ivan V. Krickov, Sergey N. Vorobyev, Mikhail A. Korets, Sergey Kopysov, Liudmila S. Shirokova, Jan Karlsson, and Oleg S. Pokrovsky
Biogeosciences, 19, 5859–5877, https://doi.org/10.5194/bg-19-5859-2022, https://doi.org/10.5194/bg-19-5859-2022, 2022
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In order to quantify C transport and emission and main environmental factors controlling the C cycle in Siberian rivers, we investigated the largest tributary of the Ob River, the Ket River basin, by measuring spatial and seasonal variations in carbon CO2 and CH4 concentrations and emissions together with hydrochemical analyses. The obtained results are useful for large-scale modeling of C emission and export fluxes from permafrost-free boreal rivers of an underrepresented region of the world.
Robert J. Parker, Chris Wilson, Edward Comyn-Platt, Garry Hayman, Toby R. Marthews, A. Anthony Bloom, Mark F. Lunt, Nicola Gedney, Simon J. Dadson, Joe McNorton, Neil Humpage, Hartmut Boesch, Martyn P. Chipperfield, Paul I. Palmer, and Dai Yamazaki
Biogeosciences, 19, 5779–5805, https://doi.org/10.5194/bg-19-5779-2022, https://doi.org/10.5194/bg-19-5779-2022, 2022
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Wetlands are the largest natural source of methane, one of the most important climate gases. The JULES land surface model simulates these emissions. We use satellite data to evaluate how well JULES reproduces the methane seasonal cycle over different tropical wetlands. It performs well for most regions; however, it struggles for some African wetlands influenced heavily by river flooding. We explain the reasons for these deficiencies and highlight how future development will improve these areas.
Saúl Edgardo Martínez Castellón, José Henrique Cattanio, José Francisco Berrêdo, Marcelo Rollnic, Maria de Lourdes Ruivo, and Carlos Noriega
Biogeosciences, 19, 5483–5497, https://doi.org/10.5194/bg-19-5483-2022, https://doi.org/10.5194/bg-19-5483-2022, 2022
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We seek to understand the influence of climatic seasonality and microtopography on CO2 and CH4 fluxes in an Amazonian mangrove. Topography and seasonality had a contrasting influence when comparing the two gas fluxes: CO2 fluxes were greater in high topography in the dry period, and CH4 fluxes were greater in the rainy season in low topography. Only CO2 fluxes were correlated with soil organic matter, the proportion of carbon and nitrogen, and redox potential.
Matthias Koschorreck, Klaus Holger Knorr, and Lelaina Teichert
Biogeosciences, 19, 5221–5236, https://doi.org/10.5194/bg-19-5221-2022, https://doi.org/10.5194/bg-19-5221-2022, 2022
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At low water levels, parts of the bottom of rivers fall dry. These beaches or mudflats emit the greenhouse gas carbon dioxide (CO2) to the atmosphere. We found that those emissions are caused by microbial reactions in the sediment and that they change with time. Emissions were influenced by many factors like temperature, water level, rain, plants, and light.
Wantong Zhang, Zhengyi Hu, Joachim Audet, Thomas A. Davidson, Enze Kang, Xiaoming Kang, Yong Li, Xiaodong Zhang, and Jinzhi Wang
Biogeosciences, 19, 5187–5197, https://doi.org/10.5194/bg-19-5187-2022, https://doi.org/10.5194/bg-19-5187-2022, 2022
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This work focused on the CH4 and N2O emissions from alpine peatlands in response to the interactive effects of altered water table levels and increased nitrogen deposition. Across the 2-year mesocosm experiment, nitrogen deposition showed nonlinear effects on CH4 emissions and linear effects on N2O emissions, and these N effects were associated with the water table levels. Our results imply the future scenario of strengthened CH4 and N2O emissions from an alpine peatland.
Karel Castro-Morales, Anna Canning, Sophie Arzberger, Will A. Overholt, Kirsten Küsel, Olaf Kolle, Mathias Göckede, Nikita Zimov, and Arne Körtzinger
Biogeosciences, 19, 5059–5077, https://doi.org/10.5194/bg-19-5059-2022, https://doi.org/10.5194/bg-19-5059-2022, 2022
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Permafrost thaw releases methane that can be emitted into the atmosphere or transported by Arctic rivers. Methane measurements are lacking in large Arctic river regions. In the Kolyma River (northeast Siberia), we measured dissolved methane to map its distribution with great spatial detail. The river’s edge and river junctions had the highest methane concentrations compared to other river areas. Microbial communities in the river showed that the river’s methane likely is from the adjacent land.
Sonja Gindorf, Hermann W. Bange, Dennis Booge, and Annette Kock
Biogeosciences, 19, 4993–5006, https://doi.org/10.5194/bg-19-4993-2022, https://doi.org/10.5194/bg-19-4993-2022, 2022
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Methane is a climate-relevant greenhouse gas which is emitted to the atmosphere from coastal areas such as the Baltic Sea. We measured the methane concentration in the water column of the western Kiel Bight. Methane concentrations were higher in September than in June. We found no relationship between the 2018 European heatwave and methane concentrations. Our results show that the methane distribution in the water column is strongly affected by temporal and spatial variabilities.
Margaret Capooci and Rodrigo Vargas
Biogeosciences, 19, 4655–4670, https://doi.org/10.5194/bg-19-4655-2022, https://doi.org/10.5194/bg-19-4655-2022, 2022
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Tidal salt marsh soil emits greenhouse gases, as well as sulfur-based gases, which play roles in global climate but are not well studied as they are difficult to measure. Traditional methods of measuring these gases worked relatively well for carbon dioxide, but less so for methane, nitrous oxide, carbon disulfide, and dimethylsulfide. High variability of trace gases complicates the ability to accurately calculate gas budgets and new approaches are needed for monitoring protocols.
Janne Rinne, Patryk Łakomiec, Patrik Vestin, Joel D. White, Per Weslien, Julia Kelly, Natascha Kljun, Lena Ström, and Leif Klemedtsson
Biogeosciences, 19, 4331–4349, https://doi.org/10.5194/bg-19-4331-2022, https://doi.org/10.5194/bg-19-4331-2022, 2022
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The study uses the stable isotope 13C of carbon in methane to investigate the origins of spatial and temporal variation in methane emitted by a temperate wetland ecosystem. The results indicate that methane production is more important for spatial variation than methane consumption by micro-organisms. Temporal variation on a seasonal timescale is most likely affected by more than one driver simultaneously.
Kukka-Maaria Kohonen, Roderick Dewar, Gianluca Tramontana, Aleksanteri Mauranen, Pasi Kolari, Linda M. J. Kooijmans, Dario Papale, Timo Vesala, and Ivan Mammarella
Biogeosciences, 19, 4067–4088, https://doi.org/10.5194/bg-19-4067-2022, https://doi.org/10.5194/bg-19-4067-2022, 2022
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Four different methods for quantifying photosynthesis (GPP) at ecosystem scale were tested, of which two are based on carbon dioxide (CO2) and two on carbonyl sulfide (COS) flux measurements. CO2-based methods are traditional partitioning, and a new method uses machine learning. We introduce a novel method for calculating GPP from COS fluxes, with potentially better applicability than the former methods. Both COS-based methods gave on average higher GPP estimates than the CO2-based estimates.
Cited articles
Abril, G., Etcheber, H., Le Hir, P., Bassoullet, P., Boutier, B., and
Frankignoulle, M.: Oxic/anoxic oscillations and organic carbon
mineralization in an estuarine maximum turbidity zone (The Gironde, France),
Limnol. Oceanogr., 44, 1304–1315, 1999.
Abril, G., Guérin, F., Richard, S., Delmas, R., Galy-Lacaux, C., Gosse,
P., Tremblay, A., Varfalvy, L., Dos Santos, M. A., and Matvienko, B.: Carbon
dioxide and methane emissions and the carbon budget of a 10-year old
tropical reservoir (Petit Saut, French Guiana), Global Biogeochem. Cy.,
19, Gb4007, https://doi.org/10.1029/2005gb002457, 2005.
Abril, G., Commarieu, M.-V., and Guérin, F.: Enhanced methane oxidation
in an estuarine turbidity maximum, Limnol. Oceanogr., 52, 470–475, 2007.
Barros, N., Cole, J. J., Tranvik, L. J., Prairie, Y. T., Bastviken, D.,
Huszar, V. L. M., del Giorgio, P., and Roland, F.: Carbon emission from
hydroelectric reservoirs linked to reservoir age and latitude, Nat.
Geosci., 4, 593–596, 2011.
Bastviken, D., Persson, L., Odham, G., and Tranvik, L.: Degradation of
dissolved organic matter in oxic and anoxic lake water, Limnol. Oceanogr., 49, 109–116, 2004.
Bevelhimer, M., Stewart, A., Fortner, A., Phillips, J., and Mosher, J.:
CO2 is Dominant Greenhouse Gas Emitted from Six Hydropower Reservoirs in
Southeastern United States during Peak Summer Emissions, Water, 8, 1–14, 2016.
Boles, J. R., Clark, J. F., Leifer, I., and Washburn, L.: Temporal variation
in natural methane seep rate due to tides, Coal Oil Point area, California,
J. Geophys. Res.-Oceans, 106, 27077–27086,
https://doi.org/10.1029/2000JC000774, 2001.
Brothers, S. M., Prairie, Y. T., and del Giorgio, P. A.: Benthic and pelagic
sources of carbon dioxide in boreal lakes and a young reservoir (Eastmain-1)
in eastern Canada, Global Biogeochem. Cy., 26, GB1002,
https://doi.org/10.1029/2011gb004074, 2012.
Chanton, J. P., Martens, C. S., and Kelley, C. A.: Gas Transport from
Methane-Saturated, Tidal Freshwater and Wetland Sediments, Limnol. Oceanogr., 34, 807–819, 1989.
Chanudet, V., Descloux, S., Harby, A., Sundt, H., Hansen, B. H., Brakstad,
O., Serca, D., and Guérin, F.: Gross CO2 and CH4 emissions from the Nam
Ngum and Nam Leuk sub-tropical reservoirs in Lao PDR, Sci. Total Environ.,
409, 5382–5391, https://doi.org/10.1016/j.scitotenv.2011.09.018, 2011.
Chanudet, V., Fabre, V., and van der Kaaij, T.: Application of a
three-dimensional hydrodynamic model to the Nam Theun 2 Reservoir (Lao PDR),
J. Great Lakes Res., 38, 260–269, https://doi.org/10.1016/j.jglr.2012.01.008, 2012.
Chen, H., Wu, Y., Yuan, X., Gao, Y., Wu, N., and Zhu, D.: Methane emissions
from newly created marshes in the drawdown area of the Three Gorges
Reservoir, J. Geophys. Res., 114, D18301, https://doi.org/10.1029/2009JD012410, 2009.
Chen, H., Yuan, X., Chen, Z., Wu, Y., Liu, X., Zhu, D., Wu, N., Zhu, Q. a.,
Peng, C., and Li, W.: Methane emissions from the surface of the Three Gorges
Reservoir, J. Geophys. Res., 116, D21306, https://doi.org/10.1029/2011jd016244, 2011.
de Brouwer, J. F. C. and Stal, L. J.: Short-term dynamics in
microphytobenthos distribution and associated extracellular carbohydrates in
surface sediments of an intertidal mudflat, Mar. Ecol. Prog. Ser.,
218, 33–44, 2001.
Deemer, B. R., Harrison, J. A., Li, S., Beaulieu, J. J., DelSontro, T.,
Barros, N., Bezerra-Neto, J. F., Powers, S. M., dos Santos, M. A., and Vonk,
J. A.: Greenhouse Gas Emissions from Reservoir Water Surfaces: A New Global
Synthesis, BioScience, 66, 949–964, https://doi.org/10.1093/biosci/biw117, 2016.
De Junet, A., Abril, G., Guérin, F., Billy, I., and De Wit, R.: A
multi-tracers analysis of sources and transfers of particulate organic
matter in a tropical reservoir (Petit Saut, French Guiana), River Res.
Appl., 25, 253–271, https://doi.org/10.1002/rra.1152, 2009.
Demarty, M., Bastien, J., and Tremblay, A.: Annual follow-up of gross
diffusive carbon dioxide and methane emissions from a boreal reservoir and
two nearby lakes in Québec, Canada, Biogeosciences, 8, 41–53,
https://doi.org/10.5194/bg-8-41-2011, 2011.
Descloux, S., Chanudet, V., Poilvé, H., and Grégoire, A.:
Co-assessment of biomass and soil organic carbon stocks in a future
reservoir area located in Southeast Asia, Environ. Monit. Assess., 173,
723–741, https://doi.org/10.1007/s10661-010-1418-3, 2011.
Descloux, S., Guedant, P., Phommachanh, D., and Luthi, R.: Main features of
the Nam Theun 2 hydroelectric project (Lao PDR) and the associated
environmental monitoring programmes, Hydroécol. Appl., 19, 5–25, 2016.
Deshmukh, C., Serça, D., Delon, C., Tardif, R., Demarty, M., Jarnot, C.,
Meyerfeld, Y., Chanudet, V., Guédant, P., Rode, W., Descloux, S., and
Guérin, F.: Physical controls on CH4 emissions from a newly flooded
subtropical freshwater hydroelectric reservoir: Nam Theun 2, Biogeosciences,
11, 4251–4269, https://doi.org/10.5194/bg-11-4251-2014, 2014.
Deshmukh, C., Guérin, F., Labat, D., Pighini, S., Vongkhamsao, A., Guédant,
P., Rode, W., Godon, A., Chanudet, V., Descloux, S., and Serça, D.: Low
methane (CH4) emissions downstream of a monomictic subtropical hydroelectric
reservoir (Nam Theun 2, Lao PDR), Biogeosciences, 13, 1919–1932,
https://doi.org/10.5194/bg-13-1919-2016, 2016.
dos Santos, M. A., Rosa, L. P., Sikar, B., Sikar, E., and dos Santos, E. O.:
Gross greenhouse gas fluxes from hydro-power reservoir compared to
thermo-power plants, Energ. Policy, 34, 481–488,
https://doi.org/10.1016/j.enpol.2004.06.015, 2006.
Engle, D. and Melack, J. M.: Methane emissions from an Amazon floodplain
lake: Enhanced release during episodic mixing and during falling water,
Biogeochemistry, 51, 71–90, 2000.
Feìlix-Faure, J., Chanudet, V., Walter, C., Dorioz, J.-M., Baudoin, J.-M.,
Lissolo, T., Descloux, S., and Dambrine, E.: Evolution des sols ennoyés
sous les retenues de barrage: Influence sur l'écologie des plans d'eau et
la dynamique des gaz à effet de serre, Etude et Gestion des Sols, 24,
45–58, 2017.
Furey, P. C., Nordin, R. N., and Mazumder, A.: Water Level Drawdown Affects
Physical and Biogeochemical Properties of Littoral Sediments of a Reservoir
and a Natural Lake, Lake Reserv. Manage., 20, 280–295,
https://doi.org/10.1080/07438140409354158, 2004.
Galy-Lacaux, C., Delmas, R., Dumestre, J.-F., and Richard, S.: Evolution
temporelle des émissions gazeuses et des profils de gaz dissous
Estimation du bilan de carbone de la retenue de Petit-Saut deux ans
après sa mise en eau, Hydroécol. Appl., 9, 85–114, 1997a.
Galy-Lacaux, C., Delmas, R., Jambert, C., Dumestre, J. F., Labroue, L.,
Richard, S., and Gosse, P.: Gaseous emissions and oxygen consumption in
hydroelectric dams: A case study in French Guyana, Global Biogeochem. Cy., 11, 471–483, 1997b.
Gudasz, C., Bastviken, D., Steger, K., Premke, K., Sobek, S., and Tranvik,
L. J.: Temperature-controlled organic carbon mineralization in lake
sediments, Nature, 466, 478–481, 2010.
Guenet, B., Danger, M., Abbadie, L., and Lacroix, G.: Priming effect:
bridging the gap between terrestrial and aquatic ecology, Ecology, 91,
2850–2861, https://doi.org/10.1890/09-1968.1, 2010.
Guérin, F. and Abril, G.: Significance of pelagic aerobic methane
oxidation in the methane and carbon budget of a tropical reservoir, J.
Geophys. Res.-Biogeo., 112, G03006, https://doi.org/10.1029/2006JG000393,
2007.
Guérin, F., Abril, G., Richard, S., Burban, B., Reynouard, C., Seyler,
P., and Delmas, R.: Methane and carbon dioxide emissions from tropical
reservoirs: Significance of downstream rivers, Geophys. Res. Lett.,
33, L21407, https://doi.org/10.1029/2006gl027929, 2006.
Guérin, F., Abril, G., Serça, D., Delon, C., Richard, S., Delmas,
R., Tremblay, A., and Varfalvy, L.: Gas transfer velocities of CO2 and
CH4 in a tropical reservoir and its river downstream, J. Mar.
Syst., 66, 161–172, 2007.
Guérin, F., Abril, G., de Junet, A., and Bonnet, M.-P.: Anaerobic
decomposition of tropical soils and plant material: Implication for the
CO2 and CH4 budget of the Petit Saut Reservoir, Appl. Geochem., 23, 2272–2283,
https://doi.org/10.1016/j.apgeochem.2008.04.001, 2008.
Guérin, F., Deshmukh, C., Labat, D., Pighini, S., Vongkhamsao, A., Guédant,
P., Rode, W., Godon, A., Chanudet, V., Descloux, S., and Serça, D.: Effect of
sporadic destratification, seasonal overturn, and artificial mixing on CH4
emissions from a subtropical hydroelectric reservoir, Biogeosciences, 13,
3647–3663, https://doi.org/10.5194/bg-13-3647-2016, 2016.
Kemenes, A., Forsberg, B. R., and Melack, J. M.: CO2 emissions from a
tropical hydroelectric reservoir (Balbina, Brazil), J. Geophys. Res., 116,
G03004, https://doi.org/10.1029/2010jg001465, 2011.
Li, Z., Zhang, Z., Lin, C., Chen, Y., Wen, A., and Fang, F.: Soil–air
greenhouse gas fluxes influenced by farming practices in reservoir drawdown
area: A case at the Three Gorges Reservoir in China, J.
Environ. Manage., 181, 64–73, https://doi.org/10.1016/j.jenvman.2016.05.080, 2016.
Lovatt Smith, P. F., Stokes, R. B., Bristow, C., and Carter, A.:
Mid-Cretaceous inversion in the Northern Khorat Plateau of Lao PDR and
Thailand, Geol. Soc. SP, 106, 233–247,
https://doi.org/10.1144/gsl.sp.1996.106.01.15, 1996.
MacIntyre, S., Jonsson, A., Jansson, M., Aberg, J., Turney, D. E., and
Miller, S. D.: Buoyancy flux, turbulence, and the gas transfer coefficient
in a stratified lake, Geophys. Res. Lett., 37, L24604, https://doi.org/10.1029/2010GL044164,
2010.
Marotta, H., Pinho, L., Gudasz, C., Bastviken, D., Tranvik, L. J., and
Enrich-Prast, A.: Greenhouse gas production in low-latitude lake sediments
responds strongly to warming, Nat. Clim. Change, 4, 467–470,
https://doi.org/10.1038/nclimate2222, 2014.
Pacheco, F. S., Soares, M. C. S., Assireu, A. T., Curtarelli, M. P., Roland,
F., Abril, G., Stech, J. L., Alvalá, P. C., and Ometto, J. P.: The effects of
river inflow and retention time on the spatial heterogeneity of chlorophyll
and water–air CO2 fluxes in a tropical hydropower reservoir, Biogeosciences,
12, 147–162, https://doi.org/10.5194/bg-12-147-2015, 2015.
Panneer Selvam, B., Natchimuthu, S., Arunachalam, L., and Bastviken, D.:
Methane and carbon dioxide emissions from inland waters in India –
implications for large scale greenhouse gas balances, Glob. Change Biol., 20, 3397–3407, https://doi.org/10.1111/gcb.12575, 2014.
Prairie, Y. T., Alm, J., Beaulieu, J., Barros, N., Battin, T., Cole, J., del
Giorgio, P., DelSontro, T., Guérin, F., Harby, A., Harrison, J.,
Mercier-Blais, S., Serça, D., Sobek, S., and Vachon, D.: Greenhouse Gas
Emissions from Freshwater Reservoirs: What Does the Atmosphere See?,
Ecosystems, https://doi.org/10.1007/s10021-017-0198-9, in press, 2018.
Raymond, P. A., Hartmann, J., Lauerwald, R., Sobek, S., McDonald, C.,
Hoover, M., Butman, D., Striegl, R., Mayorga, E., Humborg, C., Kortelainen,
P., Durr, H., Meybeck, M., Ciais, P., and Guth, P.: Global carbon dioxide
emissions from inland waters, Nature, 503, 355–359, 2013.
Roehm, C. and Tremblay, A.: Role of turbines in the carbon dioxide
emissions from two boreal reservoirs, Quebec, Canada, J. Geophys.
Res.-Atmos., 111, D24101, https://doi.org/10.1029/2006jd007292, 2006.
Roland, F., Vidal, L. O., Pacheco, F. S., Barros, N. O., Assireu, A.,
Ometto, J., Cimbleris, A. C. P., and Cole, J. J.: Variability of carbon
dioxide flux from tropical (Cerrado) hydroelectric reservoirs, Aquat.
Sci., 72, 283–293, https://doi.org/10.1007/s00027-010-0140-0, 2010.
Sabater, F., Butturini, A., MartÍ, E., Muñoz, I., Romaní, A.,
Wray, J., and Sabater, S.: Effects of riparian vegetation removal on
nutrient retention in a Mediterranean stream, J. N. Am. Benthol. Soc., 19, 609–620, https://doi.org/10.2307/1468120, 2000.
Serça, D., Delmas, R., Jambert, C., and Labroue, L.: Emissions of
nitrogen oxides from equatorial rain forest in central Africa, Tellus B, 46,
243–254, https://doi.org/10.3402/tellusb.v46i4.15795, 1994.
Serça, D., Deshmukh, C., Pighini, S., Oudone, P., Vongkhamsao, A.,
Guédant, P., Rode, W., Godon, A., Chanudet, V., Descloux, S., and
Guérin, F.: Nam Theun 2 Reservoir four years after commissioning:
significance of drawdown methane emissions and other pathways,
Hydroécol. Appl., 19, 119–146, 2016.
Smith, L. K., Lewis, W. M., Chanton, J. P., Cronin, G., and Hamilton, S. K.:
Methane emissions from the Orinoco River floodplain, Venezuela,
Biogeochemistry, 51, 113–140, https://doi.org/10.1023/a:1006443429909, 2000.
Smith, P. F. L. and Stokes, R. B.: Geology and petroleum potential of the
Khorat Plateau basin in the Vientiane area of LAO P.D.R, J.
Petrol. Geol., 20, 27–49, https://doi.org/10.1111/j.1747-5457.1997.tb00754.x, 1997.
Sobek, S., Tranvik, L. J., and Cole, J. J.: Temperature independence of
carbon dioxide supersaturation in global lakes, Glob. Biogeochem. Cy., 19,
GB2003, https://doi.org/10.1029/2004gb002264, 2005.
St Louis, V. L., Kelly, C. A., Duchemin, E., Rudd, J. W. M., and Rosenberg,
D. M.: Reservoir surfaces as sources of greenhouse gases to the atmosphere:
A global estimate, Bioscience, 50, 766–775, 2000.
Tadonléké, R. D., Marty, J., and Planas, D.: Assessing factors
underlying variation of CO2 emissions in boreal lakes vs. reservoirs, FEMS
Microbiol. Ecol., 79, 282–297, https://doi.org/10.1111/j.1574-6941.2011.01218.x, 2012.
Teodoru, C. R., Prairie, Y. T., and del Giorgio, P. A.: Spatial
Heterogeneity of Surface CO2 Fluxes in a Newly Created Eastmain-1 Reservoir
in Northern Quebec, Canada, Ecosystems, 14, 28–46,
https://doi.org/10.1007/s10021-010-9393-7, 2011.
Teodoru, C. R., Bastien, J., Bonneville, M.-C., del Giorgio, P. A., Demarty,
M., Garneau, M., Hélie, J.-F., Pelletier, L., Prairie, Y. T., Roulet, N.
T., Strachan, I. B., and Tremblay, A.: The net carbon footprint of a newly
created boreal hydroelectric reservoir, Global Biogeochem. Cy., 26,
GB2016, https://doi.org/10.1029/2011gb004187, 2012.
Wang, F., Wang, B., Liu, C.-Q., Wang, Y., Guan, J., Liu, X., and Yu, Y.:
Carbon dioxide emission from surface water in cascade reservoirs–river
system on the Maotiao River, southwest of China, Atmos. Environ.,
45, 3827–3834, https://doi.org/10.1016/j.atmosenv.2011.04.014, 2011.
Watts, C. J.: Seasonal phosphorus release from exposed, re-inundated
littoral sediments of two Australian reservoirs, Hydrobiologia, 431, 27–39,
https://doi.org/10.1023/a:1004098120517, 2000.
Weiss, R. F.: Carbon dioxide in water and seawater: the solubility of a
non-ideal gas, Mar. Chem., 2, 203–215, https://doi.org/10.1016/0304-4203(74)90015-2, 1974.
Xiao, S., Wang, Y., Liu, D., Yang, Z., Lei, D., and Zhang, C.: Diel and
seasonal variation of methane and carbon dioxide fluxes at Site Guojiaba,
the Three Gorges Reservoir, J. Environ. Sci., 25,
2065–2071, https://doi.org/10.1016/S1001-0742(12)60269-1,
2013.
Yang, L., Lu, F., Wang, X., Duan, X., Song, W., Sun, B., Chen, S., Zhang,
Q., Hou, P., Zheng, F., Zhang, Y., Zhou, X., Zhou, Y., and Ouyang, Z.:
Surface methane emissions from different land use types during various water
levels in three major drawdown areas of the Three Gorges Reservoir, J.
Geophys. Res.-Atmos., 117, D10109, https://doi.org/10.1029/2011JD017362,
2012.
Yang, L., Lu, F., Wang, X., Duan, X., Tong, L., Ouyang, Z., and Li, H.:
Spatial and seasonal variability of CO2 flux at the air-water interface of
the Three Gorges Reservoir, J. Environ. Sci., 25,
2229–2238, https://doi.org/10.1016/S1001-0742(12)60291-5,
2013.
Yvon-Durocher, G., Allen, A. P., Bastviken, D., Conrad, R., Gudasz, C.,
St-Pierre, A., Thanh-Duc, N., and del Giorgio, P. A.: Methane fluxes show
consistent temperature dependence across microbial to ecosystem scales,
Nature, 507, 488–491, https://doi.org/10.1038/nature13164, 2014.
Zhao, Y., Wu, B. F., and Zeng, Y.: Spatial and temporal patterns of
greenhouse gas emissions from Three Gorges Reservoir of China,
Biogeosciences, 10, 1219-1230, https://doi.org/10.5194/bg-10-1219-2013, 2013.
Short summary
Based on an intense monitoring of CO2 concentrations and organic and inorganic carbon in the reservoir, in the rivers upstream and downstream, and of CO2 emissions from the drawdown area, we confirmed the importance of the flooded stock of organic matter as a source of C fueling emissions and we show that the drawdown area contributes, depending on the year, from 50 to 75 % of total annual gross emissions in the flat and shallow Nam Theun 2 Reservoir.
Based on an intense monitoring of CO2 concentrations and organic and inorganic carbon in the...
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