Articles | Volume 18, issue 23
https://doi.org/10.5194/bg-18-6093-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-18-6093-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
29 Nov 2021
Research article |
| 29 Nov 2021
| 29 Nov 2021
Methane in Zackenberg Valley, NE Greenland: multidecadal growing season fluxes of a high-Arctic tundra
Department of Ecoscience, Arctic Research Centre Aarhus University,
Roskilde, Denmark
Arctic Geology Department, The University Centre in Svalbard,
Longyearbyen, Norway
Mikhail Mastepanov
Department of Ecoscience, Arctic Research Centre Aarhus University,
Roskilde, Denmark
Oulanka Research Station, University of Oulu, Oulu, Finland
Hanne H. Christiansen
Arctic Geology Department, The University Centre in Svalbard,
Longyearbyen, Norway
Torben R. Christensen
Department of Ecoscience, Arctic Research Centre Aarhus University,
Roskilde, Denmark
Oulanka Research Station, University of Oulu, Oulu, Finland
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Eeva Järvi-Laturi, Teemu Tahvanainen, Eero Koskinen, Efrén López-Blanco, Juho Lämsä, Hannu Marttila, Mikhail Mastepanov, Riku Paavola, Maria Väisänen, and Torben Røjle Christensen
EGUsphere, https://doi.org/10.5194/egusphere-2025-217, https://doi.org/10.5194/egusphere-2025-217, 2025
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Our research investigates how plant community composition influences methane emissions in a northern boreal rich fen. We measured methane fluxes year-round using manual chambers across 36 plots. Our findings suggest that sedges, particularly Carex rostrata, significantly impact the fluxes throughout the year. This study enhances our understanding of vegetation-driven methane emissions, providing valuable insights for predicting future changes in peatland methane emissions.
Lotte Wendt, Line Rouyet, Hanne H. Christiansen, Tom Rune Lauknes, and Sebastian Westermann
EGUsphere, https://doi.org/10.5194/egusphere-2024-2972, https://doi.org/10.5194/egusphere-2024-2972, 2024
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In permafrost environments, the ground surface moves due to the formation and melt of ice in the ground. This study compares ground surface displacements measured from satellite images against field data of ground ice contents. We find good agreement between the detected seasonal subsidence and observed ground ice melt. Our results show the potential of satellite remote sensing for mapping ground ice variability, but also indicate that ice in excess of the pore space must be considered.
Hanne H. Christiansen, Ilkka S. O. Matero, Lisa Baddeley, Kim Holmén, Clara J. M. Hoppe, Maarten J. J. E. Loonen, Rune Storvold, Vito Vitale, Agata Zaborska, and Heikki Lihavainen
Earth Syst. Dynam., 15, 933–946, https://doi.org/10.5194/esd-15-933-2024, https://doi.org/10.5194/esd-15-933-2024, 2024
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We provide an overview of the state and future of Earth system science in Svalbard as a synthesis of the recommendations made by the scientific community active in the archipelago. This work helped identify foci for developments of the observing system and a path forward to reach the full interdisciplinarity needed to operate at Earth system science scale. Better understanding of the processes in Svalbard will benefit both process-level understanding and Earth system models.
Sonika Shahi, Jakob Abermann, Tiago Silva, Kirsty Langley, Signe Hillerup Larsen, Mikhail Mastepanov, and Wolfgang Schöner
Weather Clim. Dynam., 4, 747–771, https://doi.org/10.5194/wcd-4-747-2023, https://doi.org/10.5194/wcd-4-747-2023, 2023
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This study highlights how the sea ice variability in the Greenland Sea affects the terrestrial climate and the surface mass changes of peripheral glaciers of the Zackenberg region (ZR), Northeast Greenland, combining model output and observations. Our results show that the temporal evolution of sea ice influences the climate anomaly magnitude in the ZR. We also found that the changing temperature and precipitation patterns due to sea ice variability can affect the surface mass of the ice cap.
Dotan Rotem, Vladimir Lyakhovsky, Hanne Hvidtfeldt Christiansen, Yehudit Harlavan, and Yishai Weinstein
The Cryosphere, 17, 3363–3381, https://doi.org/10.5194/tc-17-3363-2023, https://doi.org/10.5194/tc-17-3363-2023, 2023
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Frozen saline pore water, left over from post-glacial marine ingression, was found in shallow permafrost in a Svalbard fjord valley. This suggests that freezing occurred immediately after marine regression due to isostatic rebound. We conducted top-down freezing simulations, which confirmed that with Early to mid-Holocene temperatures (e.g. −4 °C), freezing could progress down to 20–40 m within 200 years. This, in turn, could inhibit flow through the sediment, therefore preserving saline fluids.
Junqi Wei, Xiaoyan Li, Lei Liu, Torben Røjle Christensen, Zhiyun Jiang, Yujun Ma, Xiuchen Wu, Hongyun Yao, and Efrén López-Blanco
Biogeosciences, 19, 861–875, https://doi.org/10.5194/bg-19-861-2022, https://doi.org/10.5194/bg-19-861-2022, 2022
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Although water availability has been linked to the response of ecosystem carbon (C) sink–source to climate warming, the mechanisms by which C uptake responds to soil moisture remain unclear. We explored how soil water and other environmental drivers modulate net C uptake in an alpine swamp meadow. Results reveal that nearly saturated soil conditions during warm seasons can help to maintain lower ecosystem respiration and therefore enhance the C sequestration capacity in this alpine swamp meadow.
Anna-Maria Virkkala, Susan M. Natali, Brendan M. Rogers, Jennifer D. Watts, Kathleen Savage, Sara June Connon, Marguerite Mauritz, Edward A. G. Schuur, Darcy Peter, Christina Minions, Julia Nojeim, Roisin Commane, Craig A. Emmerton, Mathias Goeckede, Manuel Helbig, David Holl, Hiroki Iwata, Hideki Kobayashi, Pasi Kolari, Efrén López-Blanco, Maija E. Marushchak, Mikhail Mastepanov, Lutz Merbold, Frans-Jan W. Parmentier, Matthias Peichl, Torsten Sachs, Oliver Sonnentag, Masahito Ueyama, Carolina Voigt, Mika Aurela, Julia Boike, Gerardo Celis, Namyi Chae, Torben R. Christensen, M. Syndonia Bret-Harte, Sigrid Dengel, Han Dolman, Colin W. Edgar, Bo Elberling, Eugenie Euskirchen, Achim Grelle, Juha Hatakka, Elyn Humphreys, Järvi Järveoja, Ayumi Kotani, Lars Kutzbach, Tuomas Laurila, Annalea Lohila, Ivan Mammarella, Yojiro Matsuura, Gesa Meyer, Mats B. Nilsson, Steven F. Oberbauer, Sang-Jong Park, Roman Petrov, Anatoly S. Prokushkin, Christopher Schulze, Vincent L. St. Louis, Eeva-Stiina Tuittila, Juha-Pekka Tuovinen, William Quinton, Andrej Varlagin, Donatella Zona, and Viacheslav I. Zyryanov
Earth Syst. Sci. Data, 14, 179–208, https://doi.org/10.5194/essd-14-179-2022, https://doi.org/10.5194/essd-14-179-2022, 2022
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The effects of climate warming on carbon cycling across the Arctic–boreal zone (ABZ) remain poorly understood due to the relatively limited distribution of ABZ flux sites. Fortunately, this flux network is constantly increasing, but new measurements are published in various platforms, making it challenging to understand the ABZ carbon cycle as a whole. Here, we compiled a new database of Arctic–boreal CO2 fluxes to help facilitate large-scale assessments of the ABZ carbon cycle.
Andreas Alexander, Jaroslav Obu, Thomas V. Schuler, Andreas Kääb, and Hanne H. Christiansen
The Cryosphere, 14, 4217–4231, https://doi.org/10.5194/tc-14-4217-2020, https://doi.org/10.5194/tc-14-4217-2020, 2020
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In this study we present subglacial air, ice and sediment temperatures from within the basal drainage systems of two cold-based glaciers on Svalbard during late spring and the summer melt season. We put the data into the context of air temperature and rainfall at the glacier surface and show the importance of surface events on the subglacial thermal regime and erosion around basal drainage channels. Observed vertical erosion rates thereby reachup to 0.9 m d−1.
Xavier Morel, Birger Hansen, Christine Delire, Per Ambus, Mikhail Mastepanov, and Bertrand Decharme
Earth Syst. Sci. Data, 12, 2365–2380, https://doi.org/10.5194/essd-12-2365-2020, https://doi.org/10.5194/essd-12-2365-2020, 2020
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Nuuk fen site is a well-instrumented Greenlandic site where soil physical variables and greenhouse gas fluxes are monitored. But knowledge of soil carbon stocks and profiles is missing. This is a crucial shortcoming for a complete evaluation of models. For the first time we measured soil carbon and nitrogen density, profiles, and stocks in the Nuuk peatland. This new dataset can contribute to further develop joint modeling of greenhouse gas emissions and soil carbon in land-surface models.
Norbert Pirk, Jakob Sievers, Jordan Mertes, Frans-Jan W. Parmentier, Mikhail Mastepanov, and Torben R. Christensen
Biogeosciences, 14, 3157–3169, https://doi.org/10.5194/bg-14-3157-2017, https://doi.org/10.5194/bg-14-3157-2017, 2017
Christian Stiegler, Magnus Lund, Torben Røjle Christensen, Mikhail Mastepanov, and Anders Lindroth
The Cryosphere, 10, 1395–1413, https://doi.org/10.5194/tc-10-1395-2016, https://doi.org/10.5194/tc-10-1395-2016, 2016
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In this study we investigate the impact of strong variability in snow accumulation during 2 subsequent years (2013–2014) on the land–atmosphere interactions and surface energy exchange in two high-Arctic tundra ecosystems (wet fen and dry heath) in Zackenberg, Northeast Greenland. We observe that the energy balance during the snowmelt periods and growing seasons was strongly regulated by the availability of snow meltwater, with strong impact on the overall ecosystem performance.
Norbert Pirk, Mikhail Mastepanov, Frans-Jan W. Parmentier, Magnus Lund, Patrick Crill, and Torben R. Christensen
Biogeosciences, 13, 903–912, https://doi.org/10.5194/bg-13-903-2016, https://doi.org/10.5194/bg-13-903-2016, 2016
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The exchange of greenhouse gases between the land and the atmosphere is often measured by monitoring the gas concentrations inside a chamber which is placed on the ground. We investigated different ways to calculate the gas exchange rate and identified several different processes which influence the gas exchange measurement.
M. Mastepanov, C. Sigsgaard, T. Tagesson, L. Ström, M. P. Tamstorf, M. Lund, and T. R. Christensen
Biogeosciences, 10, 5139–5158, https://doi.org/10.5194/bg-10-5139-2013, https://doi.org/10.5194/bg-10-5139-2013, 2013
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Biogeosciences, 22, 289–304, https://doi.org/10.5194/bg-22-289-2025, https://doi.org/10.5194/bg-22-289-2025, 2025
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Jessica Breavington, Alexandra Steckbauer, Chuancheng Fu, Mongi Ennasri, and Carlos M. Duarte
Biogeosciences, 22, 117–134, https://doi.org/10.5194/bg-22-117-2025, https://doi.org/10.5194/bg-22-117-2025, 2025
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Mangrove carbon storage in the Red Sea is lower than average due to challenging growth conditions. We collected mangrove soil cores over multiple seasons to measure greenhouse gas (GHG) flux of carbon dioxide and methane. GHG emissions are a small offset to mangrove carbon storage overall but punctuated by periods of high emission. This variation is linked to environmental and soil properties, which were also measured. The findings aid understanding of GHG dynamics in arid mangrove ecosystems.
Johnathan Daniel Maxey, Neil D. Hartstein, Hermann W. Bange, and Moritz Müller
Biogeosciences, 21, 5613–5637, https://doi.org/10.5194/bg-21-5613-2024, https://doi.org/10.5194/bg-21-5613-2024, 2024
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The distribution of N2O in fjord-like estuaries is poorly described in the Southern Hemisphere. Our study describes N2O distribution and its drivers in one such system in Macquarie Harbour, Tasmania. Water samples were collected seasonally in 2022 and 2023. Results show the system removes atmospheric N2O when river flow is high, whereas the system emits N2O when the river flow is low. N2O generated in basins is intercepted by the surface water and exported to the ocean during high river flow.
Wael Al Hamwi, Maren Dubbert, Jörg Schaller, Matthias Lück, Marten Schmidt, and Mathias Hoffmann
Biogeosciences, 21, 5639–5651, https://doi.org/10.5194/bg-21-5639-2024, https://doi.org/10.5194/bg-21-5639-2024, 2024
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We present a fully automatic, low-cost soil–plant enclosure system to monitor CO2 and evapotranspiration fluxes within greenhouse experiments. It operates in two modes: independent, using low-cost sensors, and dependent, where multiple chambers connect to a single gas analyzer via a low-cost multiplexer. This system provides precise, accurate measurements and high temporal resolution, enabling comprehensive monitoring of plant–soil responses to various treatments and conditions.
Zhao-Jun Yong, Wei-Jen Lin, Chiao-Wen Lin, and Hsing-Juh Lin
Biogeosciences, 21, 5247–5260, https://doi.org/10.5194/bg-21-5247-2024, https://doi.org/10.5194/bg-21-5247-2024, 2024
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We measured CO2 and CH4 fluxes from mangrove stems and soils of Avicennia marina and Kandelia obovata during tidal cycles. Both stem types served as CO2 and CH4 sources, emitting less CH4 than soils, with no difference in CO2 flux. While A. marina stems showed increased CO2 fluxes from low to high tides, they acted as a CH4 sink before flooding and as a source after ebbing. However, K. obovata stems showed no flux pattern. This study highlights the need to consider tidal influence and species.
Ihab Alfadhel, Ignacio Peralta-Maraver, Isabel Reche, Enrique P. Sánchez-Cañete, Sergio Aranda-Barranco, Eva Rodríguez-Velasco, Andrew S. Kowalski, and Penélope Serrano-Ortiz
Biogeosciences, 21, 5117–5129, https://doi.org/10.5194/bg-21-5117-2024, https://doi.org/10.5194/bg-21-5117-2024, 2024
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Inland saline lakes are crucial in the global carbon cycle, but increased droughts may alter their carbon exchange capacity. We measured CO2 and CH4 fluxes in a Mediterranean saline lake using the eddy covariance method under dry and wet conditions. We found the lake acts as a carbon sink during wet periods but not during droughts. These results highlight the importance of saline lakes in carbon sequestration and their vulnerability to climate-change-induced droughts.
Nathaniel B. Weston, Cynthia Troy, Patrick J. Kearns, Jennifer L. Bowen, William Porubsky, Christelle Hyacinthe, Christof Meile, Philippe Van Cappellen, and Samantha B. Joye
Biogeosciences, 21, 4837–4851, https://doi.org/10.5194/bg-21-4837-2024, https://doi.org/10.5194/bg-21-4837-2024, 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 disturbances to soils and sediments in N2O production. We demonstrate that physicochemical perturbation increases N2O production, microbial community adapts over time, and initial perturbation appears to confer resilience to subsequent disturbance.
Sigrid Trier Kjær, Sebastian Westermann, Nora Nedkvitne, and Peter Dörsch
Biogeosciences, 21, 4723–4737, https://doi.org/10.5194/bg-21-4723-2024, https://doi.org/10.5194/bg-21-4723-2024, 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 d to measure carbon loss. CO2 production was initially the highest, whereas CH4 production increased over time. The largest carbon loss was measured at the top of the peat plateau core as DOC.
Silvie Lainela, Erik Jacobs, Stella-Theresa Luik, Gregor Rehder, and Urmas Lips
Biogeosciences, 21, 4495–4519, https://doi.org/10.5194/bg-21-4495-2024, https://doi.org/10.5194/bg-21-4495-2024, 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 offshore areas of the Baltic Sea. Despite this high variability, caused mostly by coastal physical processes, the average annual air–sea CO2 fluxes differed only marginally between the sub-basins.
Maren Jenrich, Juliane Wolter, Susanne Liebner, Christian Knoblauch, Guido Grosse, Fiona Giebeler, Dustin Whalen, and Jens Strauss
EGUsphere, https://doi.org/10.5194/egusphere-2024-2891, https://doi.org/10.5194/egusphere-2024-2891, 2024
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Climate warming in the Arctic is causing the erosion of permafrost coasts and the transformation of permafrost lakes into lagoons. To understand how this affects greenhouse gas (GHG) emissions, we studied carbon dioxide (CO₂) and methane (CH₄) production in lagoons with varying sea connections. Younger lagoons produce more CH₄, while CO₂ increases in more marine conditions. Flooding of permafrost lowlands due to rising sea levels may lead to higher GHG emissions from Arctic coasts in the future.
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
Biogeosciences, 21, 4341–4359, https://doi.org/10.5194/bg-21-4341-2024, https://doi.org/10.5194/bg-21-4341-2024, 2024
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The exchange of CO2 between the sea and the atmosphere was studied in the Archipelago Sea, Baltic Sea, in 2017–2021, using an eddy covariance technique. The sea acted as a net source of CO2 with an average yearly emission of 27.1 gC m-2 yr-1, indicating that the marine ecosystem respired carbon that originated elsewhere. The yearly CO2 emission varied between 18.2–39.2 gC m-2 yr-1, mostly due to the yearly variation of ecosystem carbon uptake.
Ralf C. H. Aben, Daniël van de Craats, Jim Boonman, Stijn H. Peeters, Bart Vriend, Coline C. F. Boonman, Ype van der Velde, Gilles Erkens, and Merit van den Berg
Biogeosciences, 21, 4099–4118, https://doi.org/10.5194/bg-21-4099-2024, https://doi.org/10.5194/bg-21-4099-2024, 2024
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Drained peatlands cause high CO2 emissions. We assessed the effectiveness of subsurface water infiltration systems (WISs) in reducing CO2 emissions related to increases in water table depth (WTD) on 12 sites for up to 4 years. Results show WISs markedly reduced emissions by 2.1 t CO2-C ha-1 yr-1. The relationship between the amount of carbon above the WTD and CO2 emission was stronger than the relationship between WTD and emission. Long-term monitoring is crucial for accurate emission estimates.
Stavros Stagakis, Dominik Brunner, Junwei Li, Leif Backman, Anni Karvonen, Lionel Constantin, Leena Järvi, Minttu Havu, Jia Chen, Sophie Emberger, and Liisa Kulmala
EGUsphere, https://doi.org/10.5194/egusphere-2024-2475, https://doi.org/10.5194/egusphere-2024-2475, 2024
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The balance between CO2 uptake and emissions from urban green areas is still not well understood. This study evaluated for the first time the urban park CO2 exchange simulations by four different types of biosphere models by comparing them with observations. Even though some advantages and disadvantages of the different model types were identified, there was no strong evidence that more complex models performed better than simple ones.
Ingeborg Bussmann, Eric P. Achterberg, Holger Brix, Nicolas Brüggemann, Götz Flöser, Claudia Schütze, and Philipp Fischer
Biogeosciences, 21, 3819–3838, https://doi.org/10.5194/bg-21-3819-2024, https://doi.org/10.5194/bg-21-3819-2024, 2024
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Methane (CH4) is an important greenhouse gas and contributes to climate warming. However, the input of CH4 from coastal areas to the atmosphere is not well defined. Dissolved and atmospheric CH4 was determined at high spatial resolution in or above the North Sea. The atmospheric CH4 concentration was mainly influenced by wind direction. With our detailed study on the spatial distribution of CH4 fluxes we were able to provide a detailed and more realistic estimation of coastal CH4 fluxes.
Niu Zhu, Jinniu Wang, Dongliang Luo, Xufeng Wang, Cheng Shen, and Ning Wu
Biogeosciences, 21, 3509–3522, https://doi.org/10.5194/bg-21-3509-2024, https://doi.org/10.5194/bg-21-3509-2024, 2024
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Our study delves into the vital role of subalpine forests in the Qinghai–Tibet Plateau as carbon sinks in the context of climate change. Utilizing advanced eddy covariance systems, we uncover their significant carbon sequestration potential, observing distinct seasonal patterns influenced by temperature, humidity, and radiation. Notably, these forests exhibit robust carbon absorption, with potential implications for global carbon balance.
Colette L. Kelly, Nicole M. Travis, Pascale Anabelle Baya, Claudia Frey, Xin Sun, Bess B. Ward, and Karen L. Casciotti
Biogeosciences, 21, 3215–3238, https://doi.org/10.5194/bg-21-3215-2024, https://doi.org/10.5194/bg-21-3215-2024, 2024
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Nitrous oxide, a potent greenhouse gas, accumulates in regions of the ocean that are low in dissolved oxygen. We used a novel combination of chemical tracers to determine how nitrous oxide is produced in one of these regions, the eastern tropical North Pacific Ocean. Our experiments showed that the two most important sources of nitrous oxide under low-oxygen conditions are denitrification, an anaerobic process, and a novel “hybrid” process performed by ammonia-oxidizing archaea.
Hella van Asperen, Thorsten Warneke, Alessandro Carioca de Araújo, Bruce Forsberg, Sávio José Filgueiras Ferreira, Thomas Röckmann, Carina van der Veen, Sipko Bulthuis, Leonardo Ramos de Oliveira, Thiago de Lima Xavier, Jailson da Mata, Marta de Oliveira Sá, Paulo Ricardo Teixeira, Julie Andrews de França e Silva, Susan Trumbore, and Justus Notholt
Biogeosciences, 21, 3183–3199, https://doi.org/10.5194/bg-21-3183-2024, https://doi.org/10.5194/bg-21-3183-2024, 2024
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Carbon monoxide (CO) is regarded as an important indirect greenhouse gas. Soils can emit and take up CO, but, until now, uncertainty remains as to which process dominates in tropical rainforests. We present the first soil CO flux measurements from a tropical rainforest. Based on our observations, we report that tropical rainforest soils are a net source of CO. In addition, we show that valley streams and inundated areas are likely additional hot spots of CO in the ecosystem.
Chaolei Yang, Yufeng Tian, Jingqi Cui, Guangxiong He, Jingyuan Li, Canfeng Li, Haichuang Duan, Zong Wei, Liu Yan, Xin Xia, Yong Huang, and Aihua Jiang
EGUsphere, https://doi.org/10.5194/egusphere-2024-1226, https://doi.org/10.5194/egusphere-2024-1226, 2024
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The environmental factors and CO2 flux of the grassland ecosystem in the dry-hot valley of the Jinsha River exhibited highly seasonal characteristics. During the rainy season, the grassland showed a carbon sink feature, while during the dry season, it exhibited carbon emission status. Throughout the entire year, the grassland ecosystem acted as a weak carbon source, exhibiting a carbon-neutral. The CO2 flux was most influenced by vapor pressure deficit, relative humidity, and soil water content.
Yélognissè Agbohessou, Claire Delon, Manuela Grippa, Eric Mougin, Daouda Ngom, Espoir Koudjo Gaglo, Ousmane Ndiaye, Paulo Salgado, and Olivier Roupsard
Biogeosciences, 21, 2811–2837, https://doi.org/10.5194/bg-21-2811-2024, https://doi.org/10.5194/bg-21-2811-2024, 2024
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Emissions of greenhouse gases in the Sahel are not well represented because they are considered weak compared to the rest of the world. However, natural areas in the Sahel emit carbon dioxide and nitrous oxides, which need to be assessed because of extended surfaces. We propose an assessment of such emissions in Sahelian silvopastoral systems and of how they are influenced by environmental characteristics. These results are essential to inform climate change strategies in the region.
Merit van den Berg, Thomas M. Gremmen, Renske J. E. Vroom, Jacobus van Huissteden, Jim Boonman, Corine J. A. van Huissteden, Ype van der Velde, Alfons J. P. Smolders, and Bas P. van de Riet
Biogeosciences, 21, 2669–2690, https://doi.org/10.5194/bg-21-2669-2024, https://doi.org/10.5194/bg-21-2669-2024, 2024
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Drained peatlands emit 3 % of the global greenhouse gas emissions. Paludiculture is a way to reduce CO2 emissions while at the same time generating an income for landowners. The side effect is the potentially high methane emissions. We found very high methane emissions for broadleaf cattail compared with narrowleaf cattail and water fern. The rewetting was, however, effective to stop CO2 emissions for all species. The highest potential to reduce greenhouse gas emissions had narrowleaf cattail.
Antonio Donateo, Daniela Famulari, Donato Giovannelli, Arturo Mariani, Mauro Mazzola, Stefano Decesari, and Gianluca Pappaccogli
EGUsphere, https://doi.org/10.5194/egusphere-2024-1440, https://doi.org/10.5194/egusphere-2024-1440, 2024
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This study focuses on direct measurements of CO2 and CH4 turbulent eddy covariance fluxes in tundra ecosystems in the Svalbard Islands over a two-year period. Our results reveal dynamic interactions between climatic conditions and ecosystem activities such as photosynthesis and microbial activity. The observed net summertime methane uptake is correlated with the activation and aeration of soil microorganisms. High temperature anomalies increase CO2 and CH4 emissions.
Thea H. Heimdal, Galen A. McKinley, Adrienne J. Sutton, Amanda R. Fay, and Lucas Gloege
Biogeosciences, 21, 2159–2176, https://doi.org/10.5194/bg-21-2159-2024, https://doi.org/10.5194/bg-21-2159-2024, 2024
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Measurements of ocean carbon are limited in time and space. Machine learning algorithms are therefore used to reconstruct ocean carbon where observations do not exist. Improving these reconstructions is important in order to accurately estimate how much carbon the ocean absorbs from the atmosphere. In this study, we find that a small addition of observations from the Southern Ocean, obtained by autonomous sampling platforms, could significantly improve the reconstructions.
Guilherme L. Torres Mendonça, Julia Pongratz, and Christian H. Reick
Biogeosciences, 21, 1923–1960, https://doi.org/10.5194/bg-21-1923-2024, https://doi.org/10.5194/bg-21-1923-2024, 2024
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We study the timescale dependence of airborne fraction and underlying feedbacks by a theory of the climate–carbon system. Using simulations we show the predictive power of this theory and find that (1) this fraction generally decreases for increasing timescales and (2) at all timescales the total feedback is negative and the model spread in a single feedback causes the spread in the airborne fraction. Our study indicates that those are properties of the system, independently of the scenario.
François Clayer, Jan Erik Thrane, Kuria Ndungu, Andrew King, Peter Dörsch, and Thomas Rohrlack
Biogeosciences, 21, 1903–1921, https://doi.org/10.5194/bg-21-1903-2024, https://doi.org/10.5194/bg-21-1903-2024, 2024
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Determination of dissolved greenhouse gas (GHG) in freshwater allows us to estimate GHG fluxes. Mercuric chloride (HgCl2) is used to preserve water samples prior to GHG analysis despite its environmental and health impacts and interferences with water chemistry in freshwater. Here, we tested the effects of HgCl2, two substitutes and storage time on GHG in water from two boreal lakes. Preservation with HgCl2 caused overestimation of CO2 concentration with consequences for GHG flux estimation.
Helena Rautakoski, Mika Korkiakoski, Jarmo Mäkelä, Markku Koskinen, Kari Minkkinen, Mika Aurela, Paavo Ojanen, and Annalea Lohila
Biogeosciences, 21, 1867–1886, https://doi.org/10.5194/bg-21-1867-2024, https://doi.org/10.5194/bg-21-1867-2024, 2024
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Current and future nitrous oxide (N2O) emissions are difficult to estimate due to their high variability in space and time. Several years of N2O fluxes from drained boreal peatland forest indicate high importance of summer precipitation, winter temperature, and snow conditions in controlling annual N2O emissions. The results indicate increasing year-to-year variation in N2O emissions in changing climate with more extreme seasonal weather conditions.
Matthias Koschorreck, Norbert Kamjunke, Uta Koedel, Michael Rode, Claudia Schuetze, and Ingeborg Bussmann
Biogeosciences, 21, 1613–1628, https://doi.org/10.5194/bg-21-1613-2024, https://doi.org/10.5194/bg-21-1613-2024, 2024
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We measured the emission of carbon dioxide (CO2) and methane (CH4) from different sites at the river Elbe in Germany over 3 days to find out what is more important for quantification: small-scale spatial variability or diurnal temporal variability. We found that CO2 emissions were very different between day and night, while CH4 emissions were more different between sites. Dried out river sediments contributed to CO2 emissions, while the side areas of the river were important CH4 sources.
Odysseas Sifounakis, Edwin Haas, Klaus Butterbach-Bahl, and Maria P. Papadopoulou
Biogeosciences, 21, 1563–1581, https://doi.org/10.5194/bg-21-1563-2024, https://doi.org/10.5194/bg-21-1563-2024, 2024
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We performed a full assessment of the carbon and nitrogen cycles of a cropland ecosystem. An uncertainty analysis and quantification of all carbon and nitrogen fluxes were deployed. The inventory simulations include greenhouse gas emissions of N2O, NH3 volatilization and NO3 leaching from arable land cultivation in Greece. The inventory also reports changes in soil organic carbon and nitrogen stocks in arable soils.
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.
Justine Trémeau, Beñat Olascoaga, Leif Backman, Esko Karvinen, Henriikka Vekuri, and Liisa Kulmala
Biogeosciences, 21, 949–972, https://doi.org/10.5194/bg-21-949-2024, https://doi.org/10.5194/bg-21-949-2024, 2024
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We studied urban lawns and meadows in the Helsinki metropolitan area, Finland. We found that meadows are more resistant to drought events but that they do not increase carbon sequestration compared with lawns. Moreover, the transformation from lawns to meadows did not demonstrate any negative climate effects in terms of greenhouse gas emissions. Even though social and economic aspects also steer urban development, these results can guide planning to consider carbon-smart options.
Guantao Chen, Edzo Veldkamp, Muhammad Damris, Bambang Irawan, Aiyen Tjoa, and Marife D. Corre
Biogeosciences, 21, 513–529, https://doi.org/10.5194/bg-21-513-2024, https://doi.org/10.5194/bg-21-513-2024, 2024
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We established an oil palm management experiment in a large-scale oil palm plantation in Jambi, Indonesia. We recorded oil palm fruit yield and measured soil CO2, N2O, and CH4 fluxes. After 4 years of treatment, compared with conventional fertilization with herbicide weeding, reduced fertilization with mechanical weeding did not reduce yield and soil greenhouse gas emissions, which highlights the legacy effects of over a decade of conventional management prior to the start of the experiment.
Elizabeth Gachibu Wangari, Ricky Mwangada Mwanake, Tobias Houska, David Kraus, Gretchen Maria Gettel, Ralf Kiese, Lutz Breuer, and Klaus Butterbach-Bahl
Biogeosciences, 20, 5029–5067, https://doi.org/10.5194/bg-20-5029-2023, https://doi.org/10.5194/bg-20-5029-2023, 2023
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Agricultural landscapes act as sinks or sources of the greenhouse gases (GHGs) CO2, CH4, or N2O. Various physicochemical and biological processes control the fluxes of these GHGs between ecosystems and the atmosphere. Therefore, fluxes depend on environmental conditions such as soil moisture, soil temperature, or soil parameters, which result in large spatial and temporal variations of GHG fluxes. Here, we describe an example of how this variation may be studied and analyzed.
Laurie C. Menviel, Paul Spence, Andrew E. Kiss, Matthew A. Chamberlain, Hakase Hayashida, Matthew H. England, and Darryn Waugh
Biogeosciences, 20, 4413–4431, https://doi.org/10.5194/bg-20-4413-2023, https://doi.org/10.5194/bg-20-4413-2023, 2023
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As the ocean absorbs 25% of the anthropogenic emissions of carbon, it is important to understand the impact of climate change on the flux of carbon between the ocean and the atmosphere. Here, we use a very high-resolution ocean, sea-ice, carbon cycle model to show that the capability of the Southern Ocean to uptake CO2 has decreased over the last 40 years due to a strengthening and poleward shift of the southern hemispheric westerlies. This trend is expected to continue over the coming century.
Petr Znachor, Jiří Nedoma, Vojtech Kolar, and Anna Matoušů
Biogeosciences, 20, 4273–4288, https://doi.org/10.5194/bg-20-4273-2023, https://doi.org/10.5194/bg-20-4273-2023, 2023
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We conducted intensive spatial sampling of the hypertrophic fishpond to better understand the spatial dynamics of methane fluxes and environmental heterogeneity in fishponds. The diffusive fluxes of methane accounted for only a minor fraction of the total fluxes and both varied pronouncedly within the pond and over the studied summer season. This could be explained only by the water depth. Wind substantially affected temperature, oxygen and chlorophyll a distribution in the pond.
Sofie Sjögersten, Martha Ledger, Matthias Siewert, Betsabé de la Barreda-Bautista, Andrew Sowter, David Gee, Giles Foody, and Doreen S. Boyd
Biogeosciences, 20, 4221–4239, https://doi.org/10.5194/bg-20-4221-2023, https://doi.org/10.5194/bg-20-4221-2023, 2023
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Permafrost thaw in Arctic regions is increasing methane emissions, but quantification is difficult given the large and remote areas impacted. We show that UAV data together with satellite data can be used to extrapolate emissions across the wider landscape as well as detect areas at risk of higher emissions. A transition of currently degrading areas to fen type vegetation can increase emission by several orders of magnitude, highlighting the importance of quantifying areas at risk.
Cole G. Brachmann, Tage Vowles, Riikka Rinnan, Mats P. Björkman, Anna Ekberg, and Robert G. Björk
Biogeosciences, 20, 4069–4086, https://doi.org/10.5194/bg-20-4069-2023, https://doi.org/10.5194/bg-20-4069-2023, 2023
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Herbivores change plant communities through grazing, altering the amount of CO2 and plant-specific chemicals (termed VOCs) emitted. We tested this effect by excluding herbivores and studying the CO2 and VOC emissions. Herbivores reduced CO2 emissions from a meadow community and altered VOC composition; however, community type had the strongest effect on the amount of CO2 and VOCs released. Herbivores can mediate greenhouse gas emissions, but the effect is marginal and community dependent.
Ole Lessmann, Jorge Encinas Fernández, Karla Martínez-Cruz, and Frank Peeters
Biogeosciences, 20, 4057–4068, https://doi.org/10.5194/bg-20-4057-2023, https://doi.org/10.5194/bg-20-4057-2023, 2023
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Based on a large dataset of seasonally resolved methane (CH4) pore water concentrations in a reservoir's sediment, we assess the significance of CH4 emissions due to reservoir flushing. In the studied reservoir, CH4 emissions caused by one flushing operation can represent 7 %–14 % of the annual CH4 emissions and depend on the timing of the flushing operation. In reservoirs with high sediment loadings, regular flushing may substantially contribute to the overall CH4 emissions.
Matti Räsänen, Risto Vesala, Petri Rönnholm, Laura Arppe, Petra Manninen, Markus Jylhä, Jouko Rikkinen, Petri Pellikka, and Janne Rinne
Biogeosciences, 20, 4029–4042, https://doi.org/10.5194/bg-20-4029-2023, https://doi.org/10.5194/bg-20-4029-2023, 2023
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Fungus-growing termites recycle large parts of dead plant material in African savannas and are significant sources of greenhouse gases. We measured CO2 and CH4 fluxes from their mounds and surrounding soils in open and closed habitats. The fluxes scale with mound volume. The results show that emissions from mounds of fungus-growing termites are more stable than those from other termites. The soil fluxes around the mound are affected by the termite colonies at up to 2 m distance from the mound.
Tim René de Groot, Anne Margriet Mol, Katherine Mesdag, Pierre Ramond, Rachel Ndhlovu, Julia Catherine Engelmann, Thomas Röckmann, and Helge Niemann
Biogeosciences, 20, 3857–3872, https://doi.org/10.5194/bg-20-3857-2023, https://doi.org/10.5194/bg-20-3857-2023, 2023
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This study investigates methane dynamics in the Wadden Sea. Our measurements revealed distinct variations triggered by seasonality and tidal forcing. The methane budget was higher in warmer seasons but surprisingly high in colder seasons. Methane dynamics were amplified during low tides, flushing the majority of methane into the North Sea or releasing it to the atmosphere. Methanotrophic activity was also elevated during low tide but mitigated only a small fraction of the methane efflux.
Cited articles
Abermann, J., Hansen, B., Lund, M., Wacker, S., Karami, M., and Cappelen,
J.: Hotspots and key periods of Greenland climate change during the past six
decades, Ambio, 46, 3–11, https://doi.org/10.1007/s13280-016-0861-y, 2017.
AMAP: AMAP assessment 2015: Methane as an Arctic climate forcer, Arctic
Monitoring and Assessment Programme (AMAP), Oslo, Norway, Oslo, Norway, 152
pp., 2015.
AMAP: Snow, Water and Permafrost in the Arctic (SWIPA) 2017, Oslo, Norway,
269 pp., 2017.
Andresen, C. G., Lara, M. J., Tweedie, C. E., and Lougheed, V. L.: Rising
plant-mediated methane emissions from arctic wetlands, Glob. Change
Biol., 23, 1128–1139, https://doi.org/10.1111/gcb.13469, 2017.
Bartlett, K. B., Crill, P. M., Sass, R. L., Harriss, R. C., and Dise, N. B.:
Methane emissions from tundra environments in the Yukon-Kuskokwim delta,
Alaska, J. Geophys. Res., 97, 16645–16660, https://doi.org/10.1029/91jd00610, 1992.
Bay, C.: Vegetation mapping of Zackenberg valley, northeast Greenland,
Danish Polar Center and Botanical Museum, University of Copenhagen, 1998.
Bosse, U. and Frenzel, P.: CH4 emissions from a West Siberian mire, Suo,
52, 99–114, 2001.
Cable, S., Christiansen, H. H., Westergaard-Nielsen, A., Kroon, A., and
Elberling, B.: Geomorphological and cryostratigraphical analyses of the
Zackenberg Valley, NE Greenland and significance of Holocene alluvial fans,
Geomorphology, 303, 504–523, https://doi.org/10.1016/j.geomorph.2017.11.003, 2018.
Christensen, T. R.: Methane emission from Arctic tundra, Biogeochemistry,
21, 117–139, https://doi.org/10.1007/bf00000874, 1993.
Christensen, T. R.: Climate science: Understand Arctic methane variability,
Nature, 509, 279–281, https://doi.org/10.1038/509279a, 2014.
Christensen, T. R., Friborg, T., Sommerkorn, M., Kaplan, J., Illeris, L.,
Søgaard, H., Nordstrøm, C., and Jonasson, S.: Trace gas exchange in a
high-arctic valley 1. Variations in CO2 and CH4 flux between tundra
vegetation types, Global Biogeochem. Cy., 14, 701–713, https://doi.org/10.1029/1999gb001134, 2000.
Christensen, T. R., Johansson, T. R., Akerman, H. J., Mastepanov, M.,
Malmer, N., Friborg, T., Crill, P., and Svensson, B. H.: Thawing sub-arctic
permafrost: Effects on vegetation and methane emissions, Geophys.
Res. Lett., 31, L04501, https://doi.org/10.1029/2003gl018680, 2004.
Christensen, T. R., Arndal, M. F., and Topp-Jørgensen, E.: Greenland
Ecosystem Monitoring Annual Report Cards 2019, DCE – Danish Centre for
Environment and Energy, Aarhus University, Aarhus, Denmark, 40 pp., 2020a.
Christensen, T. R., Lund, M., Skov, K., Abermann, J., López-Blanco, E.,
Scheller, J., Scheel, M., Jackowicz-Korczynski, M., Langley, K., Murphy, M.
J., and Mastepanov, M.: Multiple Ecosystem Effects of Extreme Weather Events
in the Arctic, Ecosystems, 24, 122–136, https://doi.org/10.1007/s10021-020-00507-6, 2020b.
Christiansen, H. H., Sigsgaard, C., Humlum, O., Rasch, M., and Hansen, B.
U.: Permafrost and Periglacial Geomorphology at Zackenberg, in: High-Arctic
Ecosystem Dynamics in a Changing Climate, Advances in Ecological Research,
151–174, Amsterdam, the Netherlands, 2008.
COWI: eBee saves the day: mapping Greenland's Zackenberg Research Station, available at:
https://www.sensefly.com/app/uploads/2017/11/eBee_saves_day_mapping_greenlands_zackenberg_research_station.pdf (last access: 23 June 2021), 2015.
Crill, P. M., Bartlett, K. B., Harriss, R. C., Gorham, E., Verry, E. S.,
Sebacher, D. I., Madzar, L., and Sanner, W.: Methane flux from Minnesota
peatlands, Global Biogeochem. Cy., 2, 371–384, https://doi.org/10.1029/gb002i004p00371, 1988.
Docherty, C. L., Hannah, D. M., Riis, T., Leth, S. R., and Milner, A. M.:
Large thermo-erosional tunnel for a river in northeast Greenland, Polar
Sci., 14, 83-87, https://doi.org/10.1016/j.polar.2017.08.001, 2017.
Ehhalt, D. H.: The atmospheric cycle of methane, Tellus, 26, 58–70, https://doi.org/10.3402/tellusa.v26i1-2.9737, 1974.
Elberling, B., Tamstorf, M. P., Michelsen, A., Arndal, M. F., Sigsgaard, C.,
Illeris, L., Bay, C., Hansen, B. U., Christensen, T. R., Hansen, E. S.,
Jakobsen, B. H., and Beyens, L.: Soil and Plant Community-Characteristics
and Dynamics at Zackenberg, in: Advances in Ecological Research: High-Arctic
Ecosystem Dynamics in a Changing Climate, Elsevier, Amsterdam, the Netherlands, 223–248, 2008.
Engram, M., Anthony, K. M. W., Sachs, T., Kohnert, K., Serafimovich, A.,
Grosse, G., and Meyer, F. J.: Remote sensing northern lake methane
ebullition, Nat. Clim. Change, 10, 511–517, https://doi.org/10.1038/s41558-020-0762-8, 2020.
Falk, J. M., Schmidt, N. M., and Ström, L.: Effects of simulated
increased grazing on carbon allocation patterns in a high arctic mire,
Biogeochemistry, 119, 229–244, https://doi.org/10.1007/s10533-014-9962-5, 2014.
Falk, J. M., Schmidt, N. M., Christensen, T. R., and Ström, L.: Large
herbivore grazing affects the vegetation structure and greenhouse gas
balance in a high arctic mire, Environ. Res. Lett., 10, 045001, https://doi.org/10.1088/1748-9326/10/4/045001, 2015.
Fan, S. M., Wofsy, S. C., Bakwin, P. S., Jacob, D. J., Anderson, S. M.,
Kebabian, P. L., McManus, J. B., Kolb, C. E., and Fitzjarrald, D. R.:
Micrometeorological measurements of CH4 and CO2 exchange between the
atmosphere and subarctic tundra, J. Geophys. Res., 97,
16627–16643, https://doi.org/10.1029/91jd02531, 1992.
Farquharson, L. M., Romanovsky, V. E., Cable, W. L., Walker, D. A., Kokelj,
S. V., and Nicolsky, D.: Climate Change Drives Widespread and Rapid
Thermokarst Development in Very Cold Permafrost in the Canadian High Arctic,
Geophys. Res. Lett., 46, 6681–6689, https://doi.org/10.1029/2019gl082187,
2019.
Friborg, T., Christensen, T. R., Hansen, B. U., Nordstrøm, C., and
Søgaard, H.: Trace gas exchange in a high-Arctic valley 2. Landscape CH4
fluxes measured and modeled using eddy correlation data, Global
Biogeochem. Cy., 14, 715–723, https://doi.org/10.1029/1999gb001136, 2000.
Geng, M. S., Christensen, J. H., and Christensen, T. R.: Potential future
methane emission hot spots in Greenland, Environ. Res. Lett., 14, 035001, https://doi.org/10.1088/1748-9326/aaf34b, 2019.
Greenland Ecosystem Monitoring: GeoBasis Zackenberg – Hydrology – AC_Water_level_automatic, Greenland Ecosystem Monitoring [data set], https://doi.org/10.17897/MJ7B-Z461, 2021a.
Greenland Ecosystem Monitoring: GeoBasis Zackenberg – Hydrology – AC_Water_level_manual, Greenland Ecosystem Monitoring [data set], https://doi.org/10.17897/6HCP-M521, 2021b.
Greenland Ecosystem Monitoring: ClimateBasis Zackenberg – Air temperature – Air temperature, 200 cm @ 60 min sample (∘C), Greenland Ecosystem Monitoring [data set], https://doi.org/10.17897/XV96-HC57, 2021c.
Greenland Ecosystem Monitoring: GeoBasis Zackenberg – Flux monitoring – AC, Greenland Ecosystem Monitoring [data set], https://doi.org/10.17897/430P-DS31, 2021d.
Greenland Ecosystem Monitoring: GeoBasis Zackenberg – Soil properties – Mix-1_Soil_moisture, Greenland Ecosystem Monitoring [data set], https://doi.org/10.17897/ENNB-T831, 2021e.
Greenland Ecosystem Monitoring: GeoBasis Zackenberg – Snow properties – Snow cover (Central area), Greenland Ecosystem Monitoring [data set], https://doi.org/10.17897/499C-H459, 2021f.
Greenland Ecosystem Monitoring: ClimateBasis Zackenberg – Soil temperature – Soil temperature, 20 cm – 60 min average (∘C), Greenland Ecosystem Monitoring [data set], https://doi.org/10.17897/XW7C-NA36, 2021g.
Grøndahl, L., Friborg, T., Christensen, T. R., Ekberg, A., Elberling, B.,
Illeris, L., Nordstrøm, C., Rennermalm, Å., Sigsgaard, C., and
Søgaard, H.: Spatial and inter-annual variability of trace gas fluxes in
a heterogeneous high-arctic landscape, in: Advances in Ecological Research:
High-Arctic Ecosystem Dynamics in a Changing Climate, Elsevier, Amsterdam, the Netherlands, 473–498,
2008.
Hartley, I. P., Hill, T. C., Wade, T. J., Clement, R. J., Moncrieff, J. B.,
Prieto-Blanco, A., Disney, M. I., Huntley, B., Williams, M., Howden, N. J.
K., Wookey, P. A., and Baxter, R.: Quantifying landscape-level methane
fluxes in subarctic Finland using a multiscale approach, Glob. Change
Biol., 21, 3712–3725, https://doi.org/10.1111/gcb.12975, 2015.
Heikkinen, J. E. P., Virtanen, T., Huttunen, J. T., Elsakov, V., and
Martikainen, P. J.: Carbon balance in East European tundra, Global
Biogeochem. Cy., 18, GB1023, https://doi.org/10.1029/2003gb002054, 2004.
IPCC: Climate Change The IPCC Scientific Assessment, Intergovernmental Panel
on Climate Change, Cambridge, 1990.
Jackowicz-Korczynski, M., Christensen, T. R., Bäckstrand, K., Crill, P.,
Friborg, T., Mastepanov, M., and Ström, L.: Annual cycle of methane
emission from a subarctic peatland, J. Geophys. Res., 115,
G02009, https://doi.org/10.1029/2008jg000913, 2010.
Joabsson, A. and Christensen, T. R.: Methane emissions from wetlands and
their relationship with vascular plants: an Arctic example, Glob. Change
Biol., 7, 919–932, https://doi.org/10.1046/j.1354-1013.2001.00044.x, 2001.
Jorgenson, M. T., Schur, Y. L., and Osterkamp, T. E.: Thermokarst in Alaska,
Ninth International Conference on Permafrost, Fairbanks, 869–876, 2008.
Jørgensen, C. J., Lund Johansen, K. M., Westergaard-Nielsen, A., and
Elberling, B.: Net regional methane sink in High Arctic soils of northeast
Greenland, Nat. Geosci., 8, 20–23, https://doi.org/10.1038/ngeo2305, 2015.
Knoblauch, C., Beer, C., Liebner, S., Grigoriev, M. N., and Pfeiffer, E.-M.:
Methane production as key to the greenhouse gas budget of thawing
permafrost, Nat. Clim. Change, 8, 309–312, https://doi.org/10.1038/s41558-018-0095-z, 2018.
Kokelj, S. V. and Jorgenson, M. T.: Advances in Thermokarst Research,
Permafrost Periglac. Process., 24, 108–119, https://doi.org/10.1002/ppp.1779,
2013.
Lewkowicz, A. G. and Way, R. G.: Extremes of summer climate trigger
thousands of thermokarst landslides in a High Arctic environment, Nat.
Commun., 10, 1329, https://doi.org/10.1038/s41467-019-09314-7, 2019.
Linnet, K.: Estimation of the linear relationship between the measurements
of two methods with proportional errors, Stat. Med., 9,
1463–1473, https://doi.org/10.1002/sim.4780091210, 1990.
Livingston, G. and Hutchinson, G.: Enclosure-based measurement of trace gas
exchange: applications and sources of error, in: Biogenic trace gases:
measuring emissions from soil and water, edited by: Matson, P. A. A. H.,
R.C., Blackwell Science Ltd., 14–51, Amsterdam, the Netherlands, 1995.
López-Blanco, E., Jackowicz-Korczynski, M. A., Mastepanov, M., Skov, K.,
Westergaard-Nielsen, A., Williams, M., and Christensen, T.: Multi-year
data-model evaluation reveals the importance of nutrient availability over
climate in arctic ecosystem C dynamics, Environ. Res. Lett., 15, 094007,
https://doi.org/10.1088/1748-9326/ab865b, 2020.
Mastepanov, M., Sigsgaard, C., Dlugokencky, E. J., Houweling, S., Ström,
L., Tamstorf, M. P., and Christensen, T. R.: Large tundra methane burst
during onset of freezing, Nature, 456, 628–630, https://doi.org/10.1038/nature07464,
2008.
Mastepanov, M., Sigsgaard, C., Tagesson, T., Ström, L., Tamstorf, M. P., Lund,
M., and Christensen, T. R.: Revisiting factors controlling methane emissions
from high-Arctic tundra, Biogeosciences, 10, 5139–5158, https://doi.org/10.5194/bg-10-5139-2013, 2013.
Mastepanov, M., Pirk, N., Lopez-Blanco, E., Skov, K., Rudd, D.,
Jackowicz-Korczynski, M., Tamstorf, M., Scheller, J., and Christensen, T.
R.: Fifteen years of methane flux measurements in high-arctic tundra, in
preparation, 2021.
McGuire, A. D., Christensen, T. R., Hayes, D., Heroult, A., Euskirchen, E., Kimball,
J. S., Koven, C., Lafleur, P., Miller, P. A., Oechel, W., Peylin, P., Williams, M.,
and Yi, Y.: An assessment of the carbon balance of Arctic tundra: comparisons among
observations, process models, and atmospheric inversions, Biogeosciences, 9, 3185–3204, https://doi.org/10.5194/bg-9-3185-2012, 2012.
Meltofte, H. and Rasch, M.: The Study Area at Zackenberg, in: Advances in
Ecological Research: High-Arctic Ecosystem Dynamics in a Changing Climate,
Elsevier, Amsterdam, the Netherlands, 101–110, 2008.
Meltofte, H., Christensen, T. R., Elberling, B., Forchhammer, M. C., and
Rasch, M.: Introduction, in: Advances in Ecological Research: High-Arctic
Ecosystem Dynamics in a Changing Climate, Elsevier, Amsterdam, the Netherlands, 1–12, 2008.
Morozumi, T., Shingubara, R., Suzuki, R., Kobayashi, H., Tei, S., Takano,
S., Fan, R., Liang, M., Maximov, T., and Sugimoto, A.: Estimating methane
emissions using vegetation mapping in the taiga–tundra boundary of a
north-eastern Siberian lowland, Tellus B,
71, 1581004, https://doi.org/10.1080/16000889.2019.1581004, 2019.
Morrissey, L. A. and Livingston, G. P.: Methane emissions from Alaska
Arctic tundra: An assessment of local spatial variability, J.
Geophys. Res.-Atmos., 97, 16661–16670, https://doi.org/10.1029/92jd00063,
1992.
Nisbet, E. G., Manning, M. R., Dlugokencky, E. J., Fisher, R. E., Lowry, D.,
Michel, S. E., Myhre, C. L., Platt, M., Allen, G., Bousquet, P., Brownlow,
R., Cain, M., France, J. L., Hermansen, O., Hossaini, R., Jones, A. E.,
Levin, I., Manning, A. C., Myhre, G., Pyle, J. A., Vaughn, B. H., Warwick,
N. J., and White, J. W. C.: Very Strong. Atmospheric Methane Growth in the 4
Years 2014–2017: Implications for the paris Agreement, Global Biogeochem.
Cy., 33, 318–342, https://doi.org/10.1029/2018gb006009, 2019.
Oh, Y., Zhuang, Q. L., Liu, L. C., Welp, L. R., Lau, M. C. Y., Onstott, T.
C., Medvigy, D., Bruhwiler, L., Dlugokencky, E. J., Hugelius, G., D'Imperio,
L., and Elberling, B.: Reduced net methane emissions due to microbial
methane oxidation in a warmer Arctic, Nat. Clim. Change, 10, 317–321,
https://doi.org/10.1038/s41558-020-0734-z, 2020.
Olefeldt, D., Turetsky, M. R., Crill, P. M., and McGuire, A. D.:
Environmental and physical controls on northern terrestrial methane
emissions across permafrost zones, Glob. Change Biol., 19, 589–603, https://doi.org/10.1111/gcb.12071, 2013.
Olefeldt, D., Goswami, S., Grosse, G., Hayes, D., Hugelius, G., Kuhry, P.,
McGuire, A. D., Romanovsky, V. E., Sannel, A. B., Schuur, E. A., and
Turetsky, M. R.: Circumpolar distribution and carbon storage of thermokarst
landscapes, Nat. Commun., 7, 13043, https://doi.org/10.1038/ncomms13043, 2016.
Parmentier, F., Van Huissteden, J., Van Der Molen, M., Schaepman-Strub, G.,
Karsanaev, S., Maximov, T., and Dolman, A.: Spatial and temporal dynamics in
eddy covariance observations of methane fluxes at a tundra site in
northeastern Siberia, J. Geophys. Res., 116, G03016, https://doi.org/10.1029/2010jg001637, 2011.
Pedersen, S. H., Tamstorf, M. P., Abermann, J., Westergaard-Nielsen, A.,
Lund, M., Skov, K., Sigsgaard, C., Mylius, M. R., Hansen, B. U., Liston, G.
E., and Schmidt, N. M.: Spatiotemporal Characteristics of Seasonal Snow
Cover in Northeast Greenland from in Situ Observations, Arct. Antarctic
Alp. Res., 48, 653–671, https://doi.org/10.1657/aaar0016-028, 2016.
Pirk, N., Mastepanov, M., Parmentier, F.-J. W., Lund, M., Crill, P., and Christensen, T. R.: Calculations of automatic chamber flux measurements of methane and carbon dioxide using short time series of concentrations, Biogeosciences, 13, 903–912, https://doi.org/10.5194/bg-13-903-2016, 2016a.
Pirk, N., Tamstorf, M. P., Lund, M., Mastepanov, M., Pedersen, S. H.,
Mylius, M. R., Parmentier, F. J. W., Christiansen, H. H., and Christensen,
T. R.: Snowpack fluxes of methane and carbon dioxide from high Arctic
tundra, J. Geophys. Res.-Biogeo., 121, 2886–2900,
https://doi.org/10.1002/2016jg003486, 2016b.
QGIS.org: QGIS Geographic Information System v. 3.18.1, Open Source Geospatial Foundation Project, 2021.
R Core Team: R: A language and environment for statistical computing v. 4.0.2, R Foundation for Statistical Computing, 2021.
Roulet, N. T., Jano, A., Kelly, C., Klinger, L., Moore, T., Protz, R.,
Ritter, J., and Rouse, W.: Role of the Hudson Bay lowland as a source of
atmospheric methane, J. Geophys. Res.-Atmos., 99,
1439–1454, https://doi.org/10.1029/93jd00261, 1994.
Sachs, T., Wille, C., Boike, J., and Kutzbach, L.: Environmental controls on
ecosystem-scale CH4 emission from polygonal tundra in the Lena River Delta,
Siberia, J. Geophys. Res., 113, G00A03, https://doi.org/10.1029/2007jg000505,
2008.
Schneider, J., Grosse, G., and Wagner, D.: Land cover classification of
tundra environments in the Arctic Lena Delta based on Landsat 7 ETM+ data
and its application for upscaling of methane emissions, Remote Sens.
Environ., 113, 380–391, https://doi.org/10.1016/j.rse.2008.10.013, 2009.
Schuur, E. A., McGuire, A. D., Schadel, C., Grosse, G., Harden, J. W.,
Hayes, D. J., Hugelius, G., Koven, C. D., Kuhry, P., Lawrence, D. M.,
Natali, S. M., Olefeldt, D., Romanovsky, V. E., Schaefer, K., Turetsky, M.
R., Treat, C. C., and Vonk, J. E.: Climate change and the permafrost carbon
feedback, Nature, 520, 171–179, https://doi.org/10.1038/nature14338, 2015.
Shakhova, N., Semiletov, I., Leifer, I., Sergienko, V., Salyuk, A., Kosmach,
D., Chernykh, D., Stubbs, C., Nicolsky, D., Tumskoy, V., and Gustafsson,
Ö.: Ebullition and storm-induced methane release from the East Siberian
Arctic Shelf, Nat. Geosci., 7, 64–70, https://doi.org/10.1038/ngeo2007, 2014.
Stiegler, C., Lund, M., Christensen, T. R., Mastepanov, M., and Lindroth, A.: Two years with extreme and little snowfall: effects on energy partitioning and surface energy exchange in a high-Arctic tundra ecosystem, The Cryosphere, 10, 1395–1413, https://doi.org/10.5194/tc-10-1395-2016, 2016.
Ström, L., Ekberg, A., Mastepanov, M., and Christensen, T. R.: The
effect of vascular plants on carbon turnover and methane emissions from a
tundra wetland, Glob. Change Biol., 9, 1185–1192, https://doi.org/10.1046/j.1365-2486.2003.00655.x, 2003.
Ström, L., Tagesson, T., Mastepanov, M., and Christensen, T. R.:
Presence of Eriophorum scheuchzeri enhances substrate availability and
methane emission in an Arctic wetland, Soil Biol. Biochem., 45, 61–70, https://doi.org/10.1016/j.soilbio.2011.09.005, 2012.
Ström, L., Falk, J. M., Skov, K., Jackowicz-Korczynski, M., Mastepanov,
M., Christensen, T. R., Lund, M., and Schmidt, N. M.: Controls of spatial
and temporal variability in CH4 flux in a high arctic fen over three years,
Biogeochemistry, 125, 21–35, https://doi.org/10.1007/s10533-015-0109-0, 2015.
Svensson, B. H. and Rosswall, T.: In situ Methane Production from Acid Peat
in Plant Communities with Different Moisture Regimes in a Subarctic Mire,
Oikos, 43, 341–350, https://doi.org/10.2307/3544151, 1984.
Søgaard, H., Nordstrøm, C., Friborg, T., and Hansen, B. U.: Trace gas
exchange in a high-arctic valley 3. Integrating and scaling CO2 fluxes from
canopy to landscape using flux data, footprint modeling, and remote sensing,
Global Biogeochem. Cy., 14, 725–744, https://doi.org/10.1029/1999gb001137, 2000.
Søndergaard, J., Tamstorf, M., Elberling, B., Larsen, M. M., Mylius, M.
R., Lund, M., Abermann, J., and Rigét, F.: Mercury exports from a
High-Arctic river basin in Northeast Greenland (74∘ N) largely
controlled by glacial lake outburst floods, Sci. Total
Environ., 514, 83–91, https://doi.org/10.1016/j.scitotenv.2015.01.097, 2015.
Tagesson, T., Molder, M., Mastepanov, M., Sigsgaard, C., Tamstorf, M. P.,
Lund, M., Falk, J. M., Lindroth, A., Christensen, T. R., and Ström, L.:
Land-atmosphere exchange of methane from soil thawing to soil freezing in a
high-Arctic wet tundra ecosystem, Glob. Change Biol., 18, 1928–1940, https://doi.org/10.1111/j.1365-2486.2012.02647.x, 2012.
Tagesson, T., Mastepanov, M., Mölder, M., Tamstorf, M. P., Eklundh, L.,
Smith, B., Sigsgaard, C., Lund, M., Ekberg, A., Falk, J. M., Friborg, T.,
Christensen, T. R., and Ström, L.: Modelling of growing season methane
fluxes in a high-Arctic wet tundra ecosystem 1997–2010 using in situ and
high-resolution satellite data, Tellus B,
65, https://doi.org/10.3402/tellusb.v65i0.19722, 2013.
Taylor, M. A., Celis, G., Ledman, J. D., Bracho, R., and Schuur, E. A. G.:
Methane Efflux Measured by Eddy Covariance in Alaskan Upland Tundra
Undergoing Permafrost Degradation, J. Geophys. Res.-Biogeo., 123, 2695–2710, https://doi.org/10.1029/2018jg004444, 2018.
Thornton, B. F., Prytherch, J., Andersson, K., Brooks, I. M., Salisbury, D.,
Tjernström, M., and Crill, P. M.: Shipborne eddy covariance observations
of methane fluxes constrain Arctic sea emissions, Sci. Adv., 6,
eaay7934, https://doi.org/10.1126/sciadv.aay7934, 2020.
Tomczyk, A. M. and Ewertowski, M. W.: UAV-based remote sensing of immediate
changes in geomorphology following a glacial lake outburst flood at the
Zackenberg river, northeast Greenland, J. Maps, 16, 86–100, https://doi.org/10.1080/17445647.2020.1749146, 2020.
Tomczyk, A. M., Ewertowski, M. W., and Carrivick, J. L.: Geomorphological
impacts of a glacier lake outburst flood in the high arctic Zackenberg
River, NE Greenland, J. Hydrol., 591, 125300, https://doi.org/10.1016/j.jhydrol.2020.125300, 2020.
Turetsky, M. R., Abbott, B. W., Jones, M. C., Anthony, K. W., Olefeldt, D.,
Schuur, E. A. G., Grosse, G., Kuhry, P., Hugelius, G., Koven, C., Lawrence,
D. M., Gibson, C., Sannel, A. B. K., and McGuire, A. D.: Carbon release
through abrupt permafrost thaw, Nat. Geosci., 13, 138–145, https://doi.org/10.1038/s41561-019-0526-0, 2020.
Walter Anthony, K., Schneider von Deimling, T., Nitze, I., Frolking, S.,
Emond, A., Daanen, R., Anthony, P., Lindgren, P., Jones, B., and Grosse, G.:
21st-century modeled permafrost carbon emissions accelerated by abrupt thaw
beneath lakes, Nat. Commun., 9, 3262, https://doi.org/10.1038/s41467-018-05738-9, 2018.
Westermann, S., Elberling, B., Højlund Pedersen, S., Stendel, M., Hansen, B. U., and Liston, G. E.: Future permafrost conditions along environmental gradients in Zackenberg, Greenland, The Cryosphere, 9, 719–735, https://doi.org/10.5194/tc-9-719-2015, 2015.
Whalen, S. C. and Reeburgh, W. S.: A methane flux time series for tundra
environments, Global Biogeochem. Cy., 2, 399–409, https://doi.org/10.1029/gb002i004p00399, 1988.
Wickland, K. P., Jorgenson, M. T., Koch, J. C., Kanevskiy, M., and Striegl,
R. G.: Carbon dioxide and methane flux in a dynamic Arctic tundra landscape:
Decadal-scale impacts of ice-wedge degradation and stabilization,
Geophys. Res. Lett., 47, e2020GL089894, https://doi.org/10.1029/2020gl089894,
2020.
Wik, M., Varner, R. K., Anthony, K. W., MacIntyre, S., and Bastviken, D.:
Climate-sensitive northern lakes and ponds are critical components of
methane release, Nat. Geosci., 9, 99–106, https://doi.org/10.1038/ngeo2578, 2016.
Wille, C., Kutzbach, L., Sachs, T., Wagner, D., and Pfeiffer, E. M.: Methane
emission from Siberian arctic polygonal tundra: eddy covariance measurements
and modeling, Glob. Change Biol., 14, 1395–1408, https://doi.org/10.1111/j.1365-2486.2008.01586.x, 2008.
Short summary
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.
Our study presents a time series of methane emissions in a high-Arctic-tundra landscape over 14...
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