Articles | Volume 15, issue 20
https://doi.org/10.5194/bg-15-6349-2018
© 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-15-6349-2018
© 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 Oct 2018
Research article |
| 26 Oct 2018
| 26 Oct 2018
Longitudinal discontinuities in riverine greenhouse gas dynamics generated by dams and urban wastewater
Hyojin Jin
Department of Environmental Science and Engineering, Ewha Womans
University, Seoul 03760, Republic of Korea
Tae Kyung Yoon
Division of Environmental Strategy, Korea Environment Institute,
Sejong 30147, Republic of Korea
Most Shirina Begum
Department of Environmental Science and Engineering, Ewha Womans
University, Seoul 03760, Republic of Korea
Eun-Ju Lee
Graduate School of Environmental Studies, Seoul National University,
Seoul 08826, Republic of Korea
Neung-Hwan Oh
Graduate School of Environmental Studies, Seoul National University,
Seoul 08826, Republic of Korea
Namgoo Kang
CORRESPONDING AUTHOR
Center for Gas Analysis, Korea Research Institute of Standards and
Science, Daejeon 34113, Republic of Korea
Science of Measurement, University of Science and Technology, Daejeon
34113, Republic of Korea
Department of Environmental Science and Engineering, Ewha Womans
University, Seoul 03760, Republic of Korea
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A basin-scale field survey was combined with two laboratory incubation experiments to explore human impacts on organic matter biodegradation and CO2 emission in a highly urbanized river system in South Korea. The results suggest that river impoundment and pollution can alter the optical properties and biodegradability of both dissolved and particulate organic matter in the modified river system to such a degree that can induce a priming effect on biodegradation and CO2 emission.
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Spray- and marble-type equilibrators and a membrane-enclosed CO2 sensor were compared to assess their suitability for continuous pCO2 measurements in inland waters. The results suggest that the fast response of the equilibration systems facilitates capturing large spatial variations in pCO2 during short underway measurements. The membrane-enclosed sensor would be suitable for long-term continuous measurements if biofouling could be overcome by antifouling measures such as copper mesh coverings.
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Effective water quality management in the Elbe River from 1984 to 2018 significantly reduced CO2 emissions, particularly after Germany's reunification. Key factors in the reduction include organic carbon removal and nutrient management, with nitrogen control being more critical than phosphorus for the restoration of ecosystem capacity. Unpredictable influxes of organic carbon and the relocation of emissions from wastewater treatment can cause uncertainties for CO2 removals.
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Human activities are drastically altering water and material flows in river systems across Asia. This review provides a conceptual framework for assessing the human impacts on Asian river C fluxes and an update on anthropogenic alterations of riverine C fluxes, focusing on the impacts of water pollution and river impoundments on CO2 outgassing from the rivers draining South, Southeast, and East Asian regions that account for the largest fraction of river discharge and C exports from Asia.
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A basin-scale field survey was combined with two laboratory incubation experiments to explore human impacts on organic matter biodegradation and CO2 emission in a highly urbanized river system in South Korea. The results suggest that river impoundment and pollution can alter the optical properties and biodegradability of both dissolved and particulate organic matter in the modified river system to such a degree that can induce a priming effect on biodegradation and CO2 emission.
Mi-Hee Lee, Jean-Lionel Payeur-Poirier, Ji-Hyung Park, and Egbert Matzner
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Heavy storm events may increase the organic matter fluxes from forested watersheds and deteriorate water quality. Our study in two forested watershed in Korea revealed, that a larger proportion of coniferous forests likely leads to less organic carbon and larger of inorganic nitrogen fluxes to the receiving surface water bodies. More severe monsoon storms in the future will increase the fluxes of dissolved organic matter.
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Lakes play important roles in controlling organic matter derived from watersheds and within-lake production. The organic matter is normally measured by elemental quantities, such as carbon(C) and nitrogen(N), because the two elements are essential for aquatic ecosystems. We observed an decrease of C, but an increase of N in organic matters in a lake. The reason of the different pattern might be that inorganic N in the lake appeared to be recycled to produce organic N due to within-lake processes.
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Biogeosciences, 12, 3109–3118, https://doi.org/10.5194/bg-12-3109-2015, https://doi.org/10.5194/bg-12-3109-2015, 2015
B.-J. Jung, J.-K. Lee, H. Kim, and J.-H. Park
Biogeosciences, 11, 6119–6129, https://doi.org/10.5194/bg-11-6119-2014, https://doi.org/10.5194/bg-11-6119-2014, 2014
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Storm-enhanced export of particulate organic carbon in a mountainous headwater stream increased nonlinearly above thresholds of precipitation and discharge, far exceeding the relatively small increases of dissolved organic carbon. Particulate organic carbon exported during extreme storm events provide potential sources of reactive organic components that can rapidly biodegrade and form disinfection byproducts such as trihalomethanes in the headwater stream.
J. Lee, T. K. Yoon, S. Han, S. Kim, M. J. Yi, G. S. Park, C. Kim, Y. M. Son, R. Kim, and Y. Son
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P. K. Patra, J. G. Canadell, R. A. Houghton, S. L. Piao, N.-H. Oh, P. Ciais, K. R. Manjunath, A. Chhabra, T. Wang, T. Bhattacharya, P. Bousquet, J. Hartman, A. Ito, E. Mayorga, Y. Niwa, P. A. Raymond, V. V. S. S. Sarma, and R. Lasco
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Modelling CO2 and N2O emissions from soils in silvopastoral systems of the West African Sahelian band
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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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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
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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
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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.
Martti Honkanen, Mika Aurela, Juha Hatakka, Lumi Haraguchi, Sami Kielosto, Timo Mäkelä, Jukka Seppälä, Simo-Matti Siiriä, Ken Stenbäck, Juha-Pekka Tuovinen, Pasi Ylöstalo, and Lauri Laakso
EGUsphere, https://doi.org/10.5194/egusphere-2024-628, https://doi.org/10.5194/egusphere-2024-628, 2024
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We present the 5-year (2017–2021) data set of the air-sea CO2 flux measurements made in the Archipelago Sea, the Baltic Sea. The study site was found to act as a net source of CO2 with an average annual net air-sea CO2 exchange of 27.1 gC m-2 y-1, indicating that this marine system respires carbon originated elsewhere. The annual CO2 emission varied between 18.2 in 2018 and 39.2 gC m-2 y-1 in 2017. These two years differed greatly in terms of the algal blooms and the pCO2 drawdown.
Silvie Lainela, Erik Jacobs, Stella-Theresa Stoicescu, Gregor Rehder, and Urmas Lips
EGUsphere, https://doi.org/10.5194/egusphere-2024-598, https://doi.org/10.5194/egusphere-2024-598, 2024
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We evaluate the variability of carbon dioxide and methane in the surface layer of the north-eastern basins of the Baltic Sea in 2018. We show that the shallower coastal areas have considerably higher spatial variability and seasonal amplitude of surface layer pCO2 and cCH4 than measured in the Baltic Sea offshore areas. Despite this high variability, caused mostly by coastal physical processes, the average annual air-sea CO2 fluxes differed only marginally between the sub-basins.
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.
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.
Ralf C. H. Aben, Daniel 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
EGUsphere, https://doi.org/10.5194/egusphere-2024-403, https://doi.org/10.5194/egusphere-2024-403, 2024
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Drained peatlands cause high CO2 emissions. Raising the groundwater table can lower emissions. We used automated flux chamber measurements on 12 sites for up to 4 years and found a linear association between annual water table depth and CO2 emission. We also found that the average amount of carbon above the water table better predicted annual CO2 emission than water table depth and that water infiltration systems—used to effectively raise the water table—can be used to mitigate CO2 emissions.
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.
Lutz Beckebanze, Benjamin R. K. Runkle, Josefine Walz, Christian Wille, David Holl, Manuel Helbig, Julia Boike, Torsten Sachs, and Lars Kutzbach
Biogeosciences, 19, 3863–3876, https://doi.org/10.5194/bg-19-3863-2022, https://doi.org/10.5194/bg-19-3863-2022, 2022
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In this study, we present observations of lateral and vertical carbon fluxes from a permafrost-affected study site in the Russian Arctic. From this dataset we estimate the net ecosystem carbon balance for this study site. We show that lateral carbon export has a low impact on the net ecosystem carbon balance during the complete study period (3 months). Nevertheless, our results also show that lateral carbon export can exceed vertical carbon uptake at the beginning of the growing season.
Shahar Baram, Asher Bar-Tal, Alon Gal, Shmulik P. Friedman, and David Russo
Biogeosciences, 19, 3699–3711, https://doi.org/10.5194/bg-19-3699-2022, https://doi.org/10.5194/bg-19-3699-2022, 2022
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Static chambers are the most common tool used to measure greenhouse gas (GHG) fluxes. We tested the impact of such chambers on nitrous oxide emissions in drip irrigation. Field measurements and 3-D simulations show that the chamber base drastically affects the water and nutrient distribution in the soil and hence the measured GHG fluxes. A nomogram is suggested to determine the optimal diameter of a cylindrical chamber that ensures minimal disturbance.
Cited articles
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., Martinez, J.-M., Artigas, L. F., Moreira-Turcq, P., Benedetti, M.
F., Vidal, L., Meziane, T., Kim, J.-H., Bernardes, M. C., Savoye, N.,
Deborde, J., Souza, E. L., Alberic, P., Landim de Souza, M. F., and Roland,
F.: Amazon River carbon dioxide outgassing fueled by wetlands, Nature, 505,
395–398, 2014.
Abril, G., Bouillon, S., Darchambeau, F., Teodoru, C. R., Marwick, T. R.,
Tamooh, F., Ochieng Omengo, F., Geeraert, N., Deirmendjian, L., Polsenaere,
P., and Borges, A. V.: Technical Note: Large overestimation of
pCO2 calculated from pH and alkalinity in acidic,
organic-rich freshwaters, Biogeosciences, 12, 67–78,
https://doi.org/10.5194/bg-12-67-2015, 2015.
Alshboul, Z., Encinas-Fernandez, J., Hofmann, H., and Lorke, A.: Export of
dissolved methane and carbon dioxide with effluents from municipal
wastewater treatment plants, Environ. Sci. Tech., 50, 5555–5563,
https://doi.org/10.1021/acs.est.5b04923, 2016.
American Public Health Association: Standard Methods for the Examination of
Water and Wastewater, American Public Health Association, Washington DC,
2005.
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, https://doi.org/10.1038/ngeo1211, 2011.
Barth, J. A. C., Cronin, A. A., Dunlop, J., and Kalin, R. M.: Influence of
carbonates on the riverine carbon cycle in an anthropogenically dominated
catchment basin: evidence from major elements and stable carbon isotopes in
the Lagan River (N. Ireland), Chem. Geo., 200, 203–216.
https://doi.org/10.1016/S0009-2541(03)00193-1, 2003.
Bastviken, D., Tranvik, L. J., Downing, J. A, Crill, P. M., and Enrich-Prast,
A.: Freshwater methane emissions offset the continental carbon sink, Science,
331, p. 50,
https://doi.org/10.1126/science.1196808, 2011.
Beaulieu, J. J., Shuster, W. D., and Rebholz, J. A.: Nitrous oxide emissions
from a large, impounded river: the Ohio River, Environ. Sci. Technol., 44,
7527–7533, https://doi.org/10.1021/es1016735, 2010.
Beaulieu, J. J., Smolenski, R. L., Nietch, C. T., Townsend-Small, A., and
Elovitz, M. S.: High methane emissions from a midlatitude reservoir draining
an agricultural watershed, Environ. Sci. Technol., 48, 11100–11108,
https://doi.org/10.1021/es501871g, 2014.
Beaulieu, J. J., Nietch, C. T., and Young, J. L.: Controls on nitrous oxide
production and consumption in reservoirs of the Ohio River Basin, J. Geophys.
Res.-Biogeosci., 120, 1995–2010, https://doi.org/10.1002/2015JG002941, 2015.
Bergier, I., Ramos, F. M., and Bambace, L. A. W.: Dam reservoirs role in
carbon dynamics requires contextual landscape ecohydrology, Environ. Monit.
Assess., 186, 5985–5988, https://doi.org/10.1007/s10661-014-3834-2, 2014.
Borges, A. V. and Abril, G.: Carbon dioxide and methane dynamics in
estuaries, in: Treatise on Estuarine and Coastal Science, Volume 5, edited
by: Wolanski, E. and McLusky, D., Academic Press, Waltham, 119–161,
https://doi.org/10.1016/B978-0-12-374711-2.00504-0, 2011.
Borges, A. V., Schiettecatte, L.-S., Abril, G., Delille, B., and Gazeau, F.:
Carbon dioxide in European coastal waters, Estuar. Coast. Shelf Sci., 70,
375–387, https://doi.org/10.1016/j.ecss.2006.05.046, 2006.
Borges, A. V., Darchambeau, F., Teodoru, C. R., Marwick, T. R., Tamooh, F.,
Geeraert, N., Omengo, F. O., Guérin, F., Lambert, T., Morana, C., Okuku,
E., and Bouillon, S.: Globally significant greenhouse gas emissions from
African inland waters, Nat. Geosci., 8, 637–642, https://doi.org/10.1038/NGEO2486,
2015.
Borges, A. V., Darchambeau, F., Lambert, T., Bouillon, S., Morana, C.,
Brouyère, S., Hakoun, V., Jurado, A., Tseng, H.-C., Descy, J.-P., Roland,
F. A. E.: Effects of agricultural land use on fluvial carbon dioxide, methane
and nitrous oxide concentrations in a large European river, the Meuse
(Belgium), Sci. Total Environ., 610–611, 342–355,
https://doi.org/10.1016/j.scitotenv.2017.08.047, 2018.
Burgos, M., Sierra, A., Ortega, T., and Forja, J. M.: Anthropogenic effects
on greenhouse gas (CH4 and N2O) emissions in the guadalete river
estuary (SW Spain), Sci. Total Environ., 503–504, 179–189,
https://doi.org/10.1016/j.scitotenv.2014.06.038, 2015.
Butman, D. E., Wilson, H. F., Barnes, R. T., Xenopoulos, M. A., and Raymond,
P. A.: Increased mobilization of aged carbon to rivers by human disturbance,
Nat. Geosci., 8, 112–116, https://doi.org/10.1038/ngeo2322, 2015.
Catalán, N., Marcé R., Kothawala, D. N., and Tranvik, L. J.: Organic
carbon decomposition rates controlled by water retention time across inland
waters, Nat. Geosci., 9, 501–504, https://doi.org/10.1038/ngeo2720, 2016.
Campeau, A., Wallin, M. B., Giesler, R., Löfgren, S. M., Mörth,
C.-M., Schiff, S., Venkiteswaran, J. J., and Bishop, K.: Multiple sources and
sinks of dissolved inorganic carbon across Swedish streams, refocusing the
lens of stable C isotopes, Sci. Rep., 7, 9158,
https://doi.org/10.1038/s41598-017-09049-9, 2017.
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.
Cole, J. J., Prairie, Y. T., Caraco, N. F., McDowell, W. H., Tranvik, L. J.,
Striegl, R. G., Duarte, C. M., Kortelainen, P., Downing, J. A., Middelburg,
J. J., and Melack, J.: Plumbing the global carbon cycle: Integrating inland
waters into the terrestrial carbon budget, Ecosystems, 10, 171–184,
https://doi.org/10.1007/s10021-006-9013-8, 2007.
Crawford, J. T., Loken, L. C., Stanley, E. H., Stets, E. G., Dornblaser, M.
M., and Striegl, R. G.: Basin scale controls on CO2 and
CH4 emissions from the Upper Mississippi River, Geophys. Res.
Lett., 43, 1973–1979, https://doi.org/10.1002/2015GL067599, 2016.
Deirmendjian, L. and Abril, G.: Carbon dioxide degassing at the
groundwater-stream-atmosphere interface: isotopic equilibration and
hydrological mass balance in a sandy watershed, J. Hydrol., 558, 129–143,
https://doi.org/10.1016/j.jhydrol.2018.01.003, 2018.
Doctor, D. H., Kendall, C., Sebestyen, S. D., Shanley, J. B., Ohte, N., and
Boyer, E. W.: Carbon isotope fractionation of dissolved inorganic carbon
(DIC) due to outgassing of carbon dioxide from a headwater stream, Hydrol.
Process., 22, 2410–2423, https://doi.org/10.1002/hyp.6833, 2008.
Fellman, J. B., Hood, E., and Spencer, R. G. M.: Fluorescence spectroscopy
opens new windows into dissolved organic matter dynamics in freshwater
ecosystems: A review, Limnol. Oceanogr., 55, 2452–2462,
https://doi.org/10.4319/lo.2010.55.6.2452, 2010.
Finlay, J. C.: Patterns and controls of lotic algal stable carbon isotope
ratios, Limnol. Oceanogr., 49, 850–861, https://doi.org/10.4319/lo.2004.49.3.0850,
2004.
Frankignoulle, M., Abril, G., Borges, A., Bourge, I., Canon, C., Delille,
B., Libert, E., and Théate, J.-M.: Carbon dioxide emission from European
estuaries, Science, 282, 434–436, https://doi.org/10.1126/science.282.5388.434, 1998.
Garnier, J. and Billen, G.: Production vs. Respiration in river systems: An
indicator of an “ecological status”, Sci. Total Environ., 375, 110–124,
https://doi.org/10.1016/j.scitotenv.2006.12.006, 2007.
Garnier, J., Vilain, G., Silvestre, M., Billen, G., Jehanno, S., Poirier,
D., Martinez, A., Decuq, C., Cellier, P., and Abril, G.: Budget of methane
emissions from soils, livestock and the river network at the regional scale
of the Seine basin (France), Biogeochemistry, 116, 199–214,
https://doi.org/10.1007/s10533-013-9845-1, 2013.
Gran, G.: Determination of the equivalence point in potentiometric
titrations, Part II, Analyst, 77, 661–671, https://doi.org/10.1039/AN9527700661, 1952.
Griffith, D. R. and Raymond, P. A.: Multiple-source heterotrophy fueled by
aged organic carbon in an urbanized estuary, Mar. Chem., 124, 14–22,
https://doi.org/10.1016/j.marchem.2010.11.003, 2011.
Griffith, D. R., Barnes, R. T., and Raymond, P. A.: Inputs of fossil carbon
from wastewater treatment plants to U.S. rivers and oceans, Environ. Sci.
Technol., 43, 5647–5651, https://doi.org/10.1021/es9004043, 2009.
Guo, W., Yang, L., Zhai, W., Chen, W., Osburn, C. L., Huang, X., and Li, Y.:
Runoff-mediated seasonal oscillation in the dynamics of dissolved organic
matter in different branches of a large bifurcated estuary – The Changjiang
Estuary, J. Geophys. Res.-Biogeosci., 119, 776–793,
https://doi.org/10.1002/2013JG002540, 2014.
He, Y., Wang, X., Chen, H., Yuan, X., Wu, N., Zhang, Q., Yue, J., Zhang, Q.,
Diao, Y., and Zhou, L.: Effect of watershed urbanization on N2O
emissions from the Chongqing metropolitan river network, China, Atmos.
Environ., 171, 70–81, https://doi.org/10.1016/j.atmosenv.2017.09.043, 2017.
Hotchkiss, E. R., Hall Jr, R. O., Sponseller, R. A., Butman, D., Klaminder,
J., Laudon, H., Rosvall, M., and Karlsson, J.: Sources of and processes
controlling CO2 emissions change with the size of streams and rivers,
Nat. Geosci., 8, 696–699, https://doi.org/10.1038/ngeo2507, 2015.
Hudson, F.: Sample preparation and calculations for dissolved gas analysis
in water samples using GC headspace equilibration technique, RSKSOP-175,
Revision No. 2, U.S. Environmental Protection Agency, USA, 2004.
Jin, H., Yoon, T. K., Lee, S.-H., Kang, H., Im, J., and Park, J.-H.:
Enhanced greenhouse gas emission from exposed sediments along a
hydroelectric reservoir during an extreme drought event, Environ. Res.
Lett., 11, 124003, https://doi.org/10.1088/1748-9326/11/12/124003, 2016.
Jung, B.-J., Lee, H.-J., Jeong, J.-J., Owen, J., Kim, B., Meusburger, K.,
Alewell, C., Gebauer, G., Shope, C., and Park, J.-H.: Storm pulses and
varying sources of hydrologic carbon export from a mountainous watershed, J.
Hydrol., 440–441, 90–101, https://doi.org/10.1016/j.jhydrol.2012.03.030, 2012.
Kaushal, S. S. and Belt, K. T.: The urban watershed continuum: evolving
spatial and temporal dimensions, Urban Ecosyst., 15, 409–435,
https://doi.org/10.1007/s11252-012-0226-7, 2012.
Kempe, S.: Sinks of the anthropogenically enhanced carbon-cycle in surface
fresh waters, J. Geophys. Res., 89, 4657–4676, https://doi.org/10.1029/JD089iD03p04657,
1984.
Kling, G., Kipphut, G., and Miller, M.: The flux of CO2 and CH4
from lakes and rivers in arctic Alaska, Hydrobiologia, 240, 23–36,
https://doi.org/10.1007/BF00013449, 1992.
Koehler, B., von Wachenfeldt, E., Kothawala, D., and Tranvik, L. J.:
Reactivity continuum of dissolved organic carbon decomposition in lake
water, J. Geophys. Res., 117, G01024, https://doi.org/10.1029/2011JG001793, 2012.
Lauerwald, R., Laruelle, G. G., Hartmann, J., Ciais, P., and Regnier, P. A.
G.: Spatial patterns in CO2 evasion from the global river network,
Global Biogeochem. Cy., 29, 534–554, https://doi.org/10.1002/2014GB004941, 2015.
Liu, S., Lu, X. X., Xia, X., Zhang, S., Ran, L., Yang, X., and Liu, T.:
Dynamic biogeochemical controls on river pCO2 and recent changes
under aggravating river impoundment: An example of the subtropical Yangtze
River, Global Biogeochem. Cy., 30, 880–897, https://doi.org/10.1002/2016GB005388, 2016.
Longinelli, A. and Edmond, J. M.: Isotopic geocehmistry of the Amazon basin:
A reconnaissance, J. Geophys. Res., 88, 3703–3717,
https://doi.org/10.1029/JC088iC06p03703, 1983.
Maavara, T., Lauerwald, R., Regnier, P., and Van Cappellen, P.: Global
perturbation of organic carbon cycling by river damming, Nat. Commun., 8, 15347,
https://doi.org/10.1038/ncomms15347, 2017.
Maeck, A., DelSontro, T., McGinnis, D. F., Fischer, H., Flury, S., Schmidt,
M., Fietzek, P., and Lorke, A.: Sediment trapping by dams creates methane
emission hot spots, Environ. Sci. Technol., 47, 8130–8137,
https://doi.org/10.1021/es4003907, 2013.
Maher, D. T., Santos, I. R., Leuven, J. R. F. W., Oakes, J. M., Erler, D.
V., Carvalho, M. C., and Eyre, B. D.: Novel use of cavity ring-down
spectroscopy to investigate aquatic carbon cycling from microbial to
ecosystem scales, Environ. Sci. Technol., 47, 12938–12945,
https://doi.org/10.1021/es4027776, 2013.
Marx, A., Dusek, J., Jankovec, J., Sanda, M., Vogel, T., van Geldern, R.,
Hartmann, J., and Barth, J. A. C.: A review of CO2 and associated
carbon dynamics in headwater streams: A global perspective, Rev. Geophys.,
55, 560–585, https://doi.org/10.1002/2016RG000547, 2017.
Marwick, T. R., Tamooh, F., Teodoru, C. R.,. Borges, A. V, Darchambeau, F.,
and Bouillon, S.: The age of river-transported carbon: A global perspective,
Global Biogeochem. Cy., 29, 122–137, https://doi.org/10.1002/2014GB004911, 2015.
McCallister, S. L. and del Giorgio, P. A.: Direct measurement of the
δ13C signature of carbon respired by bacteria in lakes:
Linkages to potential carbon sources, ecosystem baseline metabolism, and
CO2 fluxes, Limnol. Oceanogr., 53, 1204–1216,
https://doi.org/10.4319/lo.2008.53.4.1204, 2008.
McKnight, D. M., Boyer, E. W., Westerhoff, P. K., Doran, P. T., Kulbe, T.,
and Anderson, D. T.: Spectroflourometric characterization of dissolved
organic matter for indication of precursor organic material and aromaticity,
Limnol. Oceanogr., 46, 38–48, https://doi.org/10.4319/lo.2001.46.1.0038, 2001.
Min, D., Kang, N., Moon, D. M., Lee, J. B., Lee, D. S., and Kim, J. S.:
Effect of variation in argon content of calibration gases on determination
of atmospheric carbon dioxide, Talanta, 80, 422–427,
https://doi.org/10.1016/j.talanta.2009.03.019, 2009.
Ministry of Environment: Statistics of Sewerage, Ministry of Environment,
Sejong, Republic of Korea, 2015.
Park, J.-H., Duan, L., Kim, B., Mitchell, M. J., and Shibata, H.: Potential
effects of climate change and variability on watershed biogeochemical
processes and water quality in Northeast Asia, Environ. Int., 36, 212–225,
https://doi.org/10.1016/j.envint.2009.10.008, 2010.
Park, J.-H., Nayna, O. K., Begum, M. S., Chea, E., Hartmann, J., Keil, R. G.,
Kumar, S., Lu, X., Ran, L., Richey, J. E., Sarma, V. V. S. S., Tareq, S. M.,
Xuan, D. T., and Yu, R.: Reviews and syntheses: Anthropogenic perturbations
to carbon fluxes in Asian river systems – concepts, emerging trends, and
research challenges, Biogeosciences, 15, 3049–3069,
https://doi.org/10.5194/bg-15-3049-2018, 2018.
Parr, T. B., Cronan, C. S., Ohno, T., Findlay, S. E. G., Smith, S. M. C., and
Simon, K. S.: Urbanization changes the composition and bioavailability of
dissolved organic matter in headwater streams, Limnol. Oceanogr., 60,
885–900, https://doi.org/10.1002/lno.10060, 2015.
Poole, G. C.: Fluvial landscape ecology: addressing uniqueness within the
river discontinuum, Freshwater Biol., 47, 641–660,
https://doi.org/10.1046/j.1365-2427.2002.00922.x, 2002.
R Development Core Team: R: A language and environment for statistical
computing; R Foundation for Statistical Computing: Vienna, Austria, available
at: http://www.r-project.org (last access: 1 June 2018), 2018.
Ran, L., Lu, X. X., Richey, J. E., Sun, H., Han, J., Yu, R., Liao, S., and
Yi, Q.: Long-term spatial and temporal variation of CO2 partial
pressure in the Yellow River, China, Biogeosciences, 12, 921–932,
https://doi.org/10.5194/bg-12-921-2015, 2015.
Ran, L., Li, L., Tian, M., Yang, X., Yu, R., Zhao, J., Wang, L., and Lu, X.
X.: Riverine CO2 emissions in the Wuding River catchment on the
Loess Plateau: Environmental controls and dam impoundment impact, J. Geophys.
Res.-Biogeosci., 122, 1439–1455, https://doi.org/10.1002/2016JG003713, 2017.
Raymond, P. A. and Bauer, J. E.: Use of 14C and 13C
natural abundances for evaluating riverine, estuarine, and coastal DOC and
POC sources and cycling: a review and synthesis, Org. Geochem., 32, 469–485,
https://doi.org/10.1016/S0146-6380(00)00190-X, 2001.
Raymond, P. A., Hartmann, J., Lauerwald, R., Sobek, S., McDonald, C.,
Hoover, M., Butman, D., Striegl, R., Mayorga, E., Humborg, C., Kortelainen,
P., Dürr, H., Meybeck, M., Ciais, P., and Guth, P.: Global carbon
dioxide emissions from inland waters, Nature, 503, 355–359,
https://doi.org/10.1038/nature12760, 2013.
Regnier, P., Friedlingstein, P., Ciais, P., Mackenzie, F. T., Gruber, N.,
Janssens, I. A., Laruelle, G. G., Lauerwald, R., Luyssaert, S., Andersson,
A. J., Arndt, S., Arnosti, C., Borges, A. V., Dale, A. W., Gallego-Sala, A.,
Goddéris, Y., Goossens, N., Hartmann, J., Heinze, C., Ilyina, T., Joos,
F., LaRowe, D. E., Leifeld, J., Meysman, F. J. R., Munhoven, G., Raymond, P.
A., Spahni, R., Suntharalingam, P., and Thullner, M.: Anthropogenic
perturbation of the carbon fluxes from land to ocean, Nat. Geosci., 6,
597–607, https://doi.org/10.1038/ngeo1830, 2013.
Richey, J. E., Devol, A. H., Wofsy, S. C., Victoria, R., and Riberio, M. N.
G.: Biogenic gases and the oxidation and reduction of carbon in Amazon River
and floodplain waters, Limnol. Oceanogr., 33, 551–561.
https://doi.org/10.4319/lo.1988.33.4.0551, 1988.
Roland, F. A. E., Darchambeau, F., Morana, C., Bouillon, S., and Borges, A.
V.: Emission and oxidation of methane in a meromictic, eutrophic and
temperate lake (Dendre, Belgium), Chemosphere, 168, 756–764,
https://doi.org/10.1016/j.chemosphere.2016.10.138, 2017.
Sawakuchi H. O., Bastviken, D., Sawakuchi, A. O., Ward, N. D., Borges, C. D.,
Tsai, S. M., Richey, J. E., Ballester, M. V., and Krusche, A. V.: Oxidative
mitigation of aquatic methane emissions in large Amazonian rivers, Glob.
Change Biol., 22, 1075–1085, https://doi.org/10.1111/gcb.13169, 2016.
Schulte, P., van Geldern, R., Freitag, H., Karim, A., Négrel, P.,
Petelet-Giraud, E., Probst, A., Probst, J.-L., Telmer, K, Veizer, J., and
Barth, J. A. C.: Applications of stable water and carbon isotopes in
watershed research: weathering, carbon cycling, and water balances, Earth
Sci. Rev., 109, 20–31, https://doi.org/10.1016/j.earscirev.2011.07.003, 2011.
Seoul Metropolitan Government: The 8th Han River Ecosystem Survey, Seoul
Institute, Seoul, Republic of Korea, 2017.
Shi, W., Chen, Q., Yi, Q., Yu, J., Ji, Y., Hu, L., and Chen, Y.: Carbon
emission from cascade reservoirs: Spatial heterogeneity and mechanisms,
Environ. Sci. Technol., 51, 12175–12181, https://doi.org/10.1021/acs.est.7b03590, 2017.
Silvennoinen, H., Liikanen, A., Rintala, J., and Martikainen, P. J.:
Greenhouse gas fluxes from the eutrophic Temmesjoki river and its estuary in
the Liminganlahti Bay (the Baltic Sea), Biogeochemistry, 90, 193–208,
https://doi.org/10.1007/s10533-008-9244-1, 2008.
Smith, R. M., Kaushal, S. S., Beaulieu, J. J., Pennino, M. J., and Welty, C.:
Influence of infrastructure on water quality and greenhouse gas dynamics in
urban streams, Biogeosciences, 14, 2831–2849,
https://doi.org/10.5194/bg-14-2831-2017, 2017.
Stanley, E. H., Casson, N. J., Christel, S., Crawford, J. T., Loken, L. C.,
and Oliver, S. K.: The ecology of methane in streams and rivers: patterns,
controls, and global significance, Ecol. Monogr., 86, 146–171,
https://doi.org/10.1890/15-1027.1, 2016.
Syvitski, J. P. M., Vörösmarty, C. J., Kettner, A. J., and Green,
P.: Impact of humans on the flux of terrestrial sediment to the global
coastal ocean, Science, 308, 376–380, https://doi.org/10.1126/science.1109454, 2005.
Telmer, K. and Veizer, J.: Carbon fluxes, pCO2 and
substrate weathering in a large northern river basin, Canada: carbon isotope
perspectives, Chem. Geol., 159, 61–86, https://doi.org/10.1016/S0009-2541(99)00034-0,
1999.
Teodoru, C. R., Nyoni, F. C., Borges, A. V., Darchambeau, F., Nyambe, I., and
Bouillon, S.: Dynamics of greenhouse gases (CO2, CH4,
N2O) along the Zambezi River and major tributaries, and their
importance in the riverine carbon budget, Biogeosciences, 12, 2431–2453,
https://doi.org/10.5194/bg-12-2431-2015, 2015.
Vannote, R. L., Minshall, G. W., Cummins, K. W., Sedell, J. R., and Cushing,
C. E.: The river continuum concept, Can. J. Fish. Aquat. Sci., 37, 130–137,
https://doi.org/10.1139/f80-017, 1980.
Wang, X., He, Y., Yuan, X., Chen, H., Peng, C., Zhu, Q., Yue, J., Ren, H.,
Deng, W., and Liu, H.: pCO2 and CO2 fluxes of
the metropolitan river network in relation to the urbanization of Chongqing,
China, J. Geophys. Res.-Biogeocsi., 122, 470–486, https://doi.org/10.1002/2016JG003494,
2017a.
Wang, X., He, Y., Yuan, X., Chen, H., Peng, C., Yue, J., Zhang, Q., Diao, Y.,
and Liu, S.: Greenhouse gases concentrations and fluxes from subtropical
small reservoirs in relation with watershed urbanization, Atmos. Environ.,
154, 225–235, https://doi.org/10.1016/j.atmosenv.2017.01.047, 2017b.
Wang, X., He, Y., Chen, H., Yuan, X., Peng, C., Yue, J., Zhang, Q., and Zhou,
L.: CH4 concentrations and fluxes in a subtropical metropolitan
river network: Watershed urbanization impacts and environmental controls,
Sci. Total Environ., 622–623, 1079–1089,
https://doi.org/10.1016/j.scitotenv.2017.12.054, 2018.
Ward, J. V. and Stanford, J. A.: Serial discontinuity concept of lotic
ecosystems, in: Dynamics of Lotic Systems, edited by: Fontaine, T. D. and
Bartell, S. M., Ann Arbor Science, Ann Arbor, 29–42, 1983.
Weishaar, J. L., Aiken, G. R., Bergamaschi, B. A., Fram, M. S., Fujii, R.,
and Mopper, K.: Evaluation of specific ultra-violet absorbance as an
indicator of the chemical composition and reactivity of dissolved organic
carbon, Environ. Sci. Technol., 37, 4702–4708, https://doi.org/10.1021/es030360x, 2003.
Yoon, T. K., Jin, H., Oh, N.-H., and Park, J.-H.: Technical note: Assessing
gas equilibration systems for continuous pCO2 measurements
in inland waters, Biogeosciences, 13, 3915–3930,
https://doi.org/10.5194/bg-13-3915-2016, 2016.
Yoon, T. K., Jin, H., Begum, M. S., Kang, N., and Park, J.-H.: CO2
outgassing from an urbanized river system fueled by wastewater treatment
plant effluents, Environ. Sci. Technol., 51, 10459–10467,
https://doi.org/10.1021/acs.est.7b02344, 2017.
Yu, Z. J., Deng, H. G., Wang, D. Q., Ye, M. W., Tan, Y. J., Li, Y. J., Chen,
Z. L., and Xu, S.Y.: Nitrous oxide emissions in the Shanghai river network:
implications for the effects of urban sewage and IPCC methodology, Glob.
Change Biol., 19, 2999–3010, https://doi.org/10.1111/gcb.12290, 2013.
Zhang, J., Quay, P. D., and Wilbur, D. O.: Carbon isotope fractionation
during gas-water exchange and dissolution of CO2, Geochim.
Cosmochim. Acta, 59, 107–114, https://doi.org/10.1016/0016-7037(95)91550-D,
1995.
Zsolnay, A., Baigar, E., Jimenez, M., Steinweg, B., and Saccomandi, F.:
Differentiating with fluorescence spectroscopy the sources of dissolved
organic matter in soils subjected to drying, Chemosphere, 38, 45–50,
https://doi.org/10.1016/S0045-6535(98)00166-0, 1999.
Short summary
Basin-wide comparisons of 3 major greenhouse gases (GHGs) were combined with measurements of C isotopes in DOC, CO2, and CH4 to explore how dams and urban wastewater modify the continuum of riverine GHG dynamics in a highly human-impacted river basin in Korea. Contrasting dam effects on 3 GHGs and pulsatile increases in GHGs downstream of urban tributaries delivering wastewater-derived GHGs and old DOC suggest anthropogenic discontinuities in riverine metabolic processes and GHG dynamics.
Basin-wide comparisons of 3 major greenhouse gases (GHGs) were combined with measurements of C...
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