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.
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
Related authors
Most Shirina Begum, Hyojin Jin, Inae Jang, Jung-Min Lee, Han Bin Oh, and Ji-Hyung Park
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-93, https://doi.org/10.5194/bg-2017-93, 2017
Manuscript not accepted for further review
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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.
Tae Kyung Yoon, Hyojin Jin, Neung-Hwan Oh, and Ji-Hyung Park
Biogeosciences, 13, 3915–3930, https://doi.org/10.5194/bg-13-3915-2016, https://doi.org/10.5194/bg-13-3915-2016, 2016
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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.
Mingyang Tian, Jens Hartmann, Gibran Romero-Mujalli, Thorben Amann, Lishan Ran, and Ji-Hyung Park
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-131, https://doi.org/10.5194/bg-2023-131, 2023
Preprint under review for BG
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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.
Ji-Hyung Park, Omme K. Nayna, Most S. Begum, Eliyan Chea, Jens Hartmann, Richard G. Keil, Sanjeev Kumar, Xixi Lu, Lishan Ran, Jeffrey E. Richey, Vedula V. S. S. Sarma, Shafi M. Tareq, Do Thi Xuan, and Ruihong Yu
Biogeosciences, 15, 3049–3069, https://doi.org/10.5194/bg-15-3049-2018, https://doi.org/10.5194/bg-15-3049-2018, 2018
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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.
Most Shirina Begum, Hyojin Jin, Inae Jang, Jung-Min Lee, Han Bin Oh, and Ji-Hyung Park
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-93, https://doi.org/10.5194/bg-2017-93, 2017
Manuscript not accepted for further review
Short summary
Short summary
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
Biogeosciences, 13, 5421–5432, https://doi.org/10.5194/bg-13-5421-2016, https://doi.org/10.5194/bg-13-5421-2016, 2016
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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.
Tae Kyung Yoon, Hyojin Jin, Neung-Hwan Oh, and Ji-Hyung Park
Biogeosciences, 13, 3915–3930, https://doi.org/10.5194/bg-13-3915-2016, https://doi.org/10.5194/bg-13-3915-2016, 2016
Short summary
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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.
Phil-Goo Kang, Myron J. Mitchell, Patrick J. McHale, Charles T. Driscoll, Shreeram Inamdar, and Ji-Hyung Park
Biogeosciences, 13, 2787–2801, https://doi.org/10.5194/bg-13-2787-2016, https://doi.org/10.5194/bg-13-2787-2016, 2016
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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.
E.-J. Lee, G.-Y. Yoo, Y. Jeong, K.-U. Kim, J.-H. Park, and N.-H. Oh
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
Biogeosciences, 11, 4637–4650, https://doi.org/10.5194/bg-11-4637-2014, https://doi.org/10.5194/bg-11-4637-2014, 2014
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
Biogeosciences, 10, 513–527, https://doi.org/10.5194/bg-10-513-2013, https://doi.org/10.5194/bg-10-513-2013, 2013
Related subject area
Biogeochemistry: Greenhouse Gases
Technical note: Skirt chamber – an open dynamic method for the rapid and minimally intrusive measurement of greenhouse gas emissions from peatlands
Seasonal variability of nitrous oxide concentrations and emissions in a temperate estuary
Reviews and syntheses: Recent advances in microwave remote sensing in support of terrestrial carbon cycle science in Arctic–boreal regions
Simulated methane emissions from Arctic ponds are highly sensitive to warming
Water-table-driven greenhouse gas emission estimates guide peatland restoration at national scale
Relationships between greenhouse gas production and landscape position during short-term permafrost thaw under anaerobic conditions in the Lena Delta
Diel and seasonal methane dynamics in the shallow and turbulent Wadden Sea
Carbon emissions and radiative forcings from tundra wildfires in the Yukon–Kuskokwim River Delta, Alaska
Carbon monoxide (CO) cycling in the Fram Strait, Arctic Ocean
Post-flooding disturbance recovery promotes carbon capture in riparian zones
Assessing CO2 and CH4 fluxes from mounds of African fungus-growing termites
Methane emissions due to reservoir flushing: a significant emission pathway?
Capabilities of optical and radar Earth observation data for up-scaling methane emissions linked to subsidence and permafrost degradation in sub-Arctic peatlands
Meteorological responses of carbon dioxide and methane fluxes in the terrestrial and aquatic ecosystems of a subarctic landscape
Herbivore-shrub interactions influence ecosystem respiration and BVOC composition in the subarctic
Spatial and temporal variability of methane emissions and environmental conditions in a hyper-eutrophic fishpond
Carbon emission and export from the Ket River, western Siberia
Evaluation of wetland CH4 in the Joint UK Land Environment Simulator (JULES) land surface model using satellite observations
Greenhouse gas fluxes in mangrove forest soil in an Amazon estuary
Temporal patterns and drivers of CO2 emission from dry sediments in a groyne field of a large river
Effects of water table level and nitrogen deposition on methane and nitrous oxide emissions in an alpine peatland
Highest methane concentrations in an Arctic river linked to local terrestrial inputs
Seasonal study of the small-scale variability in dissolved methane in the western Kiel Bight (Baltic Sea) during the European heatwave in 2018
Trace gas fluxes from tidal salt marsh soils: implications for carbon–sulfur biogeochemistry
Spatial and temporal variation in δ13C values of methane emitted from a hemiboreal mire: methanogenesis, methanotrophy, and hysteresis
Intercomparison of methods to estimate gross primary production based on CO2 and COS flux measurements
Lateral carbon export has low impact on the net ecosystem carbon balance of a polygonal tundra catchment
The effect of static chamber base on N2O flux in drip irrigation
Controls on autotrophic and heterotrophic respiration in an ombrotrophic bog
Episodic N2O emissions following tillage of a legume–grass cover crop mixture
Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia
Response of vegetation and carbon fluxes to brown lemming herbivory in northern Alaska
Sources of nitrous oxide and the fate of mineral nitrogen in subarctic permafrost peat soils
Data-based estimates of interannual sea–air CO2 flux variations 1957–2020 and their relation to environmental drivers
Evaluating alternative ebullition models for predicting peatland methane emission and its pathways via data–model fusion
Excess soil moisture and fresh carbon input are prerequisites for methane production in podzolic soil
Low biodegradability of particulate organic carbon mobilized from thaw slumps on the Peel Plateau, NT, and possible chemosynthesis and sorption effects
Grazing enhances carbon cycling but reduces methane emission during peak growing season in the Siberian Pleistocene Park tundra site
Ideas and perspectives: Enhancing research and monitoring of carbon pools and land-to-atmosphere greenhouse gases exchange in developing countries
Ignoring carbon emissions from thermokarst ponds results in overestimation of tundra net carbon uptake
Quantification of potential methane emissions associated with organic matter amendments following oxic-soil inundation
Assessing the spatial and temporal variability of greenhouse gas emissions from different configurations of on-site wastewater treatment system using discrete and continuous gas flux measurement
Dimethylated sulfur compounds in the Peruvian upwelling system
Partitioning carbon sources between wetland and well-drained ecosystems to a tropical first-order stream – implications for carbon cycling at the watershed scale (Nyong, Cameroon)
Extreme events driving year-to-year differences in gross primary productivity across the US
Methane gas emissions from savanna fires: what analysis of local burning regimes in a working West African landscape tell us
Methane in Zackenberg Valley, NE Greenland: multidecadal growing season fluxes of a high-Arctic tundra
Field-scale CH4 emission at a subarctic mire with heterogeneous permafrost thaw status
Evaluation of denitrification and decomposition from three biogeochemical models using laboratory measurements of N2, N2O and CO2
Temporal trends in methane emissions from a small eutrophic reservoir: the key role of a spring burst
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.
Tim René de Groot, Anne Margriet Mol, Katherine Mesdag, Pierre Ramond, Rachel Ndhlovu, Julia Catherine Engelmann, Thomas Röckmann, and Helge Niemann
EGUsphere, https://doi.org/10.5194/egusphere-2023-983, https://doi.org/10.5194/egusphere-2023-983, 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. Methane budget was higher in warmer seasons, but remained surprisingly high in colder seasons. Methane dynamics were amplified during low tides, flushing the majority of methane into the North Sea or released to the atmosphere. Methanotrophic activity was also elevated during low tide but mitigated only a small fraction of the methane efflux.
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.
Matti Räsänen, Risto Vesala, Petri Rönnholm, Laura Arppe, Petra Manninen, Markus Jylhä, Jouko Rikkinen, Petri Pellikka, and Janne Rinne
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-24, https://doi.org/10.5194/bg-2023-24, 2023
Revised manuscript accepted for BG
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Fungus-growing termites recycle large part 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 at 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 up to 2 m distance from the mound.
Ole Lessmann, Jorge Encinas Fernández, Karla Martínez-Cruz, and Frank Peeters
EGUsphere, https://doi.org/10.5194/egusphere-2023-422, https://doi.org/10.5194/egusphere-2023-422, 2023
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In our study, we assess the significance of methane (CH4) emissions due to reservoir flushing. We generated a large dataset of CH4 pore water concentrations in a reservoir's sediment to resolve seasonal CH4 distributions in the sediment. Our results show that in the studied reservoir, CH4 emissions caused by one flushing operation can represent 7–14 % of the annual CH4 emissions and that timing and frequency of the flushing operations affect the amount of released CH4.
Sofie Sjogersten, Martha Ledger, Matthias Siewert, Betsabé de la Barreda-Bautista, Andrew Sowter, David Gee, Giles Foody, and Doreen S. Boyd
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-17, https://doi.org/10.5194/bg-2023-17, 2023
Revised manuscript accepted for BG
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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 drone data together with satellite data can be used to extrapolate emissions across the wider landscape as well as detecting areas at risk of higher emissions. A transition of currently degrading areas to fen type vegetation can increase emission with several orders of magnitude highlighting the importance of quantifying areas at risk.
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.
Cole G. Brachmann, Tage Vowles, Riikka Rinnan, Mats P. Björkman, Anna Ekberg, and Robert G. Björk
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-14, https://doi.org/10.5194/bg-2023-14, 2023
Revised manuscript accepted for BG
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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.
Petr Znachor, Jiří Nedoma, Vojtech Kolar, and Anna Matoušů
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-4, https://doi.org/10.5194/bg-2023-4, 2023
Revised manuscript accepted for BG
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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, which could be explained only by the water depth. Wind substantially affected temperature, oxygen and chlorophyll-a distribution in the pond.
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.
Tracy E. Rankin, Nigel T. Roulet, and Tim R. Moore
Biogeosciences, 19, 3285–3303, https://doi.org/10.5194/bg-19-3285-2022, https://doi.org/10.5194/bg-19-3285-2022, 2022
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Peatland respiration is made up of plant and peat sources. How to separate these sources is not well known as peat respiration is not straightforward and is more influenced by vegetation dynamics than previously thought. Results of plot level measurements from shrubs and sparse grasses in a woody bog show that plants' respiration response to changes in climate is related to their different root structures, implying a difference in the mechanisms by which they obtain water resources.
Alison Bressler and Jennifer Blesh
Biogeosciences, 19, 3169–3184, https://doi.org/10.5194/bg-19-3169-2022, https://doi.org/10.5194/bg-19-3169-2022, 2022
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Our field experiment tested if a mixture of a nitrogen-fixing legume and non-legume cover crop could reduce nitrous oxide (N2O) emissions following tillage, compared to the legume grown alone. We found higher N2O following both legume treatments, compared to those without, and lower emissions from the cover crop mixture at one of the two test sites, suggesting that interactions between cover crop types and soil quality influence N2O emissions.
Sari Juutinen, Mika Aurela, Juha-Pekka Tuovinen, Viktor Ivakhov, Maiju Linkosalmi, Aleksi Räsänen, Tarmo Virtanen, Juha Mikola, Johanna Nyman, Emmi Vähä, Marina Loskutova, Alexander Makshtas, and Tuomas Laurila
Biogeosciences, 19, 3151–3167, https://doi.org/10.5194/bg-19-3151-2022, https://doi.org/10.5194/bg-19-3151-2022, 2022
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We measured CO2 and CH4 fluxes in heterogenous Arctic tundra in eastern Siberia. We found that tundra wetlands with sedge and grass vegetation contributed disproportionately to the landscape's ecosystem CO2 uptake and CH4 emissions to the atmosphere. Moreover, we observed high CH4 consumption in dry tundra, particularly in barren areas, offsetting part of the CH4 emissions from the wetlands.
Jessica Plein, Rulon W. Clark, Kyle A. Arndt, Walter C. Oechel, Douglas Stow, and Donatella Zona
Biogeosciences, 19, 2779–2794, https://doi.org/10.5194/bg-19-2779-2022, https://doi.org/10.5194/bg-19-2779-2022, 2022
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Tundra vegetation and the carbon balance of Arctic ecosystems can be substantially impacted by herbivory. We tested how herbivory by brown lemmings in individual enclosure plots have impacted carbon exchange of tundra ecosystems via altering carbon dioxide (CO2) and methane (CH4) fluxes. Lemmings significantly decreased net CO2 uptake while not affecting CH4 emissions. There was no significant difference in the subsequent growing season due to recovery of the vegetation.
Jenie Gil, Maija E. Marushchak, Tobias Rütting, Elizabeth M. Baggs, Tibisay Pérez, Alexander Novakovskiy, Tatiana Trubnikova, Dmitry Kaverin, Pertti J. Martikainen, and Christina Biasi
Biogeosciences, 19, 2683–2698, https://doi.org/10.5194/bg-19-2683-2022, https://doi.org/10.5194/bg-19-2683-2022, 2022
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N2O emissions from permafrost soils represent up to 11.6 % of total N2O emissions from natural soils, and their contribution to the global N2O budget will likely increase due to climate change. A better understanding of N2O production from permafrost soil is needed to evaluate the role of arctic ecosystems in the global N2O budget. By studying microbial N2O production processes in N2O hotspots in permafrost peatlands, we identified denitrification as the dominant source of N2O in these surfaces.
Christian Rödenbeck, Tim DeVries, Judith Hauck, Corinne Le Quéré, and Ralph F. Keeling
Biogeosciences, 19, 2627–2652, https://doi.org/10.5194/bg-19-2627-2022, https://doi.org/10.5194/bg-19-2627-2022, 2022
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The ocean is an important part of the global carbon cycle, taking up about a quarter of the anthropogenic CO2 emitted by burning of fossil fuels and thus slowing down climate change. However, the CO2 uptake by the ocean is, in turn, affected by variability and trends in climate. Here we use carbon measurements in the surface ocean to quantify the response of the oceanic CO2 exchange to environmental conditions and discuss possible mechanisms underlying this response.
Shuang Ma, Lifen Jiang, Rachel M. Wilson, Jeff P. Chanton, Scott Bridgham, Shuli Niu, Colleen M. Iversen, Avni Malhotra, Jiang Jiang, Xingjie Lu, Yuanyuan Huang, Jason Keller, Xiaofeng Xu, Daniel M. Ricciuto, Paul J. Hanson, and Yiqi Luo
Biogeosciences, 19, 2245–2262, https://doi.org/10.5194/bg-19-2245-2022, https://doi.org/10.5194/bg-19-2245-2022, 2022
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The relative ratio of wetland methane (CH4) emission pathways determines how much CH4 is oxidized before leaving the soil. We found an ebullition modeling approach that has a better performance in deep layer pore water CH4 concentration. We suggest using this approach in land surface models to accurately represent CH4 emission dynamics and response to climate change. Our results also highlight that both CH4 flux and belowground concentration data are important to constrain model parameters.
Mika Korkiakoski, Tiia Määttä, Krista Peltoniemi, Timo Penttilä, and Annalea Lohila
Biogeosciences, 19, 2025–2041, https://doi.org/10.5194/bg-19-2025-2022, https://doi.org/10.5194/bg-19-2025-2022, 2022
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We measured CH4 fluxes and production and oxidation potentials from irrigated and non-irrigated podzolic soil in a boreal forest. CH4 sink was smaller at the irrigated site but did not cause CH4 emission, with one exception. We also showed that under laboratory conditions, not only wet conditions, but also fresh carbon, are needed to make podzolic soil into a CH4 source. Our study provides important data for improving the process models describing the upland soil CH4 dynamics.
Sarah Shakil, Suzanne E. Tank, Jorien E. Vonk, and Scott Zolkos
Biogeosciences, 19, 1871–1890, https://doi.org/10.5194/bg-19-1871-2022, https://doi.org/10.5194/bg-19-1871-2022, 2022
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Permafrost thaw-driven landslides in the western Arctic are increasing organic carbon delivered to headwaters of drainage networks in the western Canadian Arctic by orders of magnitude. Through a series of laboratory experiments, we show that less than 10 % of this organic carbon is likely to be mineralized to greenhouse gases during transport in these networks. Rather most of the organic carbon is likely destined for burial and sequestration for centuries to millennia.
Wolfgang Fischer, Christoph K. Thomas, Nikita Zimov, and Mathias Göckede
Biogeosciences, 19, 1611–1633, https://doi.org/10.5194/bg-19-1611-2022, https://doi.org/10.5194/bg-19-1611-2022, 2022
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Arctic permafrost ecosystems may release large amounts of carbon under warmer future climates and may therefore accelerate global climate change. Our study investigated how long-term grazing by large animals influenced ecosystem characteristics and carbon budgets at a Siberian permafrost site. Our results demonstrate that such management can contribute to stabilizing ecosystems to keep carbon in the ground, particularly through drying soils and reducing methane emissions.
Dong-Gill Kim, Ben Bond-Lamberty, Youngryel Ryu, Bumsuk Seo, and Dario Papale
Biogeosciences, 19, 1435–1450, https://doi.org/10.5194/bg-19-1435-2022, https://doi.org/10.5194/bg-19-1435-2022, 2022
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As carbon (C) and greenhouse gas (GHG) research has adopted appropriate technology and approach (AT&A), low-cost instruments, open-source software, and participatory research and their results were well accepted by scientific communities. In terms of cost, feasibility, and performance, the integration of low-cost and low-technology, participatory and networking-based research approaches can be AT&A for enhancing C and GHG research in developing countries.
Lutz Beckebanze, Zoé Rehder, David Holl, Christian Wille, Charlotta Mirbach, and Lars Kutzbach
Biogeosciences, 19, 1225–1244, https://doi.org/10.5194/bg-19-1225-2022, https://doi.org/10.5194/bg-19-1225-2022, 2022
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Arctic permafrost landscapes feature many water bodies. In contrast to the terrestrial parts of the landscape, the water bodies release carbon to the atmosphere. We compare carbon dioxide and methane fluxes from small water bodies to the surrounding tundra and find not accounting for the carbon dioxide emissions leads to an overestimation of the tundra uptake by 11 %. Consequently, changes in hydrology and water body distribution may substantially impact the overall carbon budget of the Arctic.
Brian Scott, Andrew H. Baldwin, and Stephanie A. Yarwood
Biogeosciences, 19, 1151–1164, https://doi.org/10.5194/bg-19-1151-2022, https://doi.org/10.5194/bg-19-1151-2022, 2022
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Carbon dioxide and methane contribute to global warming. What can we do? We can build wetlands: they store carbon dioxide and should cause global cooling. But when first built they produce excess methane. Eventually built wetlands will cause cooling, but it may take decades or even centuries. How we build wetlands matters. We show that a common practice, using organic matter, such as manure, can make a big difference whether or not the wetlands we build start global cooling within our lifetime.
Jan Knappe, Celia Somlai, and Laurence W. Gill
Biogeosciences, 19, 1067–1085, https://doi.org/10.5194/bg-19-1067-2022, https://doi.org/10.5194/bg-19-1067-2022, 2022
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Two domestic on-site wastewater treatment systems have been monitored for greenhouse gas (carbon dioxide, methane and nitrous oxide) emissions coming from the process units, soil and vent pipes. This has enabled the net greenhouse gas per person to be quantified for the first time, as well as the impact of pre-treatment on the effluent before being discharged to soil. These decentralised wastewater treatment systems serve approx. 20 % of the population in both Europe and the United States.
Yanan Zhao, Dennis Booge, Christa A. Marandino, Cathleen Schlundt, Astrid Bracher, Elliot L. Atlas, Jonathan Williams, and Hermann W. Bange
Biogeosciences, 19, 701–714, https://doi.org/10.5194/bg-19-701-2022, https://doi.org/10.5194/bg-19-701-2022, 2022
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We present here, for the first time, simultaneously measured dimethylsulfide (DMS) seawater concentrations and DMS atmospheric mole fractions from the Peruvian upwelling region during two cruises in December 2012 and October 2015. Our results indicate low oceanic DMS concentrations and atmospheric DMS molar fractions in surface waters and the atmosphere, respectively. In addition, the Peruvian upwelling region was identified as an insignificant source of DMS emissions during both periods.
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
Biogeosciences, 19, 137–163, https://doi.org/10.5194/bg-19-137-2022, https://doi.org/10.5194/bg-19-137-2022, 2022
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We monitor the spatio-temporal variability of organic and inorganic carbon (C) species in the tropical Nyong River (Cameroon), across groundwater and increasing stream orders. We show the significant contribution of wetland as a C source for tropical rivers. Thus, ignoring the river–wetland connectivity might lead to the misrepresentation of C dynamics in tropical watersheds. Finally, total fluvial carbon losses might offset ~10 % of the net C sink estimated for the whole Nyong watershed.
Alexander J. Turner, Philipp Köhler, Troy S. Magney, Christian Frankenberg, Inez Fung, and Ronald C. Cohen
Biogeosciences, 18, 6579–6588, https://doi.org/10.5194/bg-18-6579-2021, https://doi.org/10.5194/bg-18-6579-2021, 2021
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This work builds a high-resolution estimate (500 m) of gross primary productivity (GPP) over the US using satellite measurements of solar-induced chlorophyll fluorescence (SIF) from the TROPOspheric Monitoring Instrument (TROPOMI) between 2018 and 2020. We identify ecosystem-specific scaling factors for estimating gross primary productivity (GPP) from TROPOMI SIF. Extreme precipitation events drive four regional GPP anomalies that account for 28 % of year-to-year GPP differences across the US.
Paul Laris, Moussa Koné, Fadiala Dembélé, Christine M. Rodrigue, Lilian Yang, Rebecca Jacobs, and Quincy Laris
Biogeosciences, 18, 6229–6244, https://doi.org/10.5194/bg-18-6229-2021, https://doi.org/10.5194/bg-18-6229-2021, 2021
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Savanna fires play a key role in the global carbon cycle because they release methane. Although it burns the most, there are few studies from West Africa. We conducted 36 experimental fires according to local practice to collect smoke samples. We found that fires set early in the season had higher methane emissions than those set later, and head fires had double the emissions of backfires. We conclude policies to reduce emissions will not have the desired effects if fire type is not considered.
Johan H. Scheller, Mikhail Mastepanov, Hanne H. Christiansen, and Torben R. Christensen
Biogeosciences, 18, 6093–6114, https://doi.org/10.5194/bg-18-6093-2021, https://doi.org/10.5194/bg-18-6093-2021, 2021
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Our study presents a time series of methane emissions in a high-Arctic-tundra landscape over 14 summers, which shows large variations between years. The methane emissions from the valley are expected to more than double in the late 21st century. This warming increases permafrost thaw, which could increase surface erosion in the valley. Increased erosion could offset some of the rise in methane fluxes from the valley, but this would require large-scale impacts on vegetated surfaces.
Patryk Łakomiec, Jutta Holst, Thomas Friborg, Patrick Crill, Niklas Rakos, Natascha Kljun, Per-Ola Olsson, Lars Eklundh, Andreas Persson, and Janne Rinne
Biogeosciences, 18, 5811–5830, https://doi.org/10.5194/bg-18-5811-2021, https://doi.org/10.5194/bg-18-5811-2021, 2021
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Methane emission from the subarctic mire with heterogeneous permafrost status was measured for the years 2014–2016. Lower methane emission was measured from the palsa mire sector while the thawing wet sector emitted more. Both sectors have a similar annual pattern with a gentle rise during spring and a decrease during autumn. The highest emission was observed in the late summer. Winter emissions were positive during the measurement period and have a significant impact on the annual budgets.
Balázs Grosz, Reinhard Well, Rene Dechow, Jan Reent Köster, Mohammad Ibrahim Khalil, Simone Merl, Andreas Rode, Bianca Ziehmer, Amanda Matson, and Hongxing He
Biogeosciences, 18, 5681–5697, https://doi.org/10.5194/bg-18-5681-2021, https://doi.org/10.5194/bg-18-5681-2021, 2021
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To assure quality predictions biogeochemical models must be current. We use data measured using novel incubation methods to test the denitrification sub-modules of three models. We aim to identify limitations in the denitrification modeling to inform next steps for development. Several areas are identified, most urgently improved denitrification control parameters and further testing with high-temporal-resolution datasets. Addressing these would significantly improve denitrification modeling.
Sarah Waldo, Jake J. Beaulieu, William Barnett, D. Adam Balz, Michael J. Vanni, Tanner Williamson, and John T. Walker
Biogeosciences, 18, 5291–5311, https://doi.org/10.5194/bg-18-5291-2021, https://doi.org/10.5194/bg-18-5291-2021, 2021
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Human-made reservoirs impact the carbon cycle. In particular, the breakdown of organic matter in reservoir sediments can result in large emissions of greenhouse gases (especially methane) to the atmosphere. This study takes an intensive look at the patterns in greenhouse gas emissions from a single reservoir in Ohio (United States) and the role of water temperature, precipitation, and algal blooms in emissions. We saw a "spring burst" of elevated emissions that challenged our assumptions.
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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