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, 2069–2086, https://doi.org/10.5194/bg-22-2069-2025, https://doi.org/10.5194/bg-22-2069-2025, 2025
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Biogeosciences, 22, 1697–1709, https://doi.org/10.5194/bg-22-1697-2025, https://doi.org/10.5194/bg-22-1697-2025, 2025
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Lakes can be sources and sinks of the greenhouse gas carbon dioxide. The gas exchange between the atmosphere and the water can be measured by taking gas samples from them. However, the depth of water samples is not well defined, which may cause errors. We hypothesized that gradients of CO2 concentrations develop under the surface when wind speeds are very low. Our measurements show that such a gradient can occur on calm nights, potentially shifting lakes from a CO2 sink to a source.
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Biogeosciences, 22, 1529–1542, https://doi.org/10.5194/bg-22-1529-2025, https://doi.org/10.5194/bg-22-1529-2025, 2025
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The increase in atmospheric concentrations of several greenhouse gases (GHGs) since 1750 is attributed to human activity. However, natural ecosystems, such as tropical forests, also contribute to GHG budgets. The Congo Basin hosts the second largest tropical forest and is understudied. In this study, measurements of soil GHG exchange were carried out during 16 months in a tropical forest in the Congo Basin. Overall, the soil acted as a major source of CO2 and N2O and a minor sink of CH4.
Aldis Butlers, Raija Laiho, Andis Lazdiņš, Thomas Schindler, Kaido Soosaar, Jyrki Jauhiainen, Arta Bārdule, Muhammad Kamil-Sardar, Ieva Līcīte, Valters Samariks, Andreas Haberl, Hanna Vahter, Dovilė Čiuldienė, Jani Anttila, and Kęstutis Armolaitis
EGUsphere, https://doi.org/10.5194/egusphere-2025-1032, https://doi.org/10.5194/egusphere-2025-1032, 2025
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A two-year study in Estonia, Latvia, and Lithuania evaluated the carbon balance of drained and undrained nutrient-rich forest organic soils, ranging from highly mineralized soils close to the threshold of organic soil definition to deep peat. The soils varied in pH, macronutrient levels, and C:N ratio, which contributed to the observed behavior of the soils demonstrating carbon sink and source dynamics under both drained and undrained conditions.
Olli-Pekka Tikkasalo, Olli Peltola, Pavel Alekseychik, Juha Heikkinen, Samuli Launiainen, Aleksi Lehtonen, Qian Li, Eduardo Martínez-García, Mikko Peltoniemi, Petri Salovaara, Ville Tuominen, and Raisa Mäkipää
Biogeosciences, 22, 1277–1300, https://doi.org/10.5194/bg-22-1277-2025, https://doi.org/10.5194/bg-22-1277-2025, 2025
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The emissions of greenhouse gases (GHGs) carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) were measured from a clear-cut peatland forest site. The measurements covered the whole year of 2022, which was the second growing season after the clear-cut. The site was a strong GHG source, and the highest emissions came from CO2, followed by N2O and CH4. A statistical model that included information on different surfaces at the site was developed to unravel surface-type-specific GHG fluxes.
Ruth Reef, Edoardo Daly, Tivanka Anandappa, Eboni-Jane Vienna-Hallam, Harriet Robertson, Matthew Peck, and Adrien Guyot
Biogeosciences, 22, 1149–1162, https://doi.org/10.5194/bg-22-1149-2025, https://doi.org/10.5194/bg-22-1149-2025, 2025
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Studies show that saltmarshes excel at capturing carbon from the atmosphere. In this study, we measured CO2 flux in an Australian temperate saltmarsh on French Island. The temperate saltmarsh exhibited strong seasonality. During the warmer growing season, the saltmarsh absorbed 10.5 g CO2 m−2 on average daily from the atmosphere. Even in winter, when plants were dormant, it continued to be a CO2 sink, albeit a smaller one. Cool temperatures and high cloud cover inhibit carbon sequestration.
Sebastian F. A. Jordan, Stefan Schloemer, Martin Krüger, Tanja Heffner, Marcus A. Horn, and Martin Blumenberg
Biogeosciences, 22, 809–830, https://doi.org/10.5194/bg-22-809-2025, https://doi.org/10.5194/bg-22-809-2025, 2025
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Using a multilayer approach, we studied the methane flux, soil gas composition, and isotopic signatures of soil methane and carbon dioxide at eight cut and buried abandoned oil wells in a peat-rich area of northern Germany. The detected methane emissions were of biogenic, peat origin and were not associated with the abandoned wells. Additional microbial analysis and methane oxidation rate measurements demonstrated a high methane emission mitigation potential in the studied peat soils.
Laura Thölix, Leif Backman, Minttu Havu, Esko Karvinen, Jesse Soininen, Justine Trémeau, Olli Nevalainen, Joyson Ahongshangbam, Leena Järvi, and Liisa Kulmala
Biogeosciences, 22, 725–749, https://doi.org/10.5194/bg-22-725-2025, https://doi.org/10.5194/bg-22-725-2025, 2025
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Cities aim for carbon neutrality and seek to understand urban vegetation's role as a carbon sink. Direct measurements are challenging, so models are used to estimate the urban carbon cycle. We evaluated model performance at estimating carbon sequestration in lawns, park trees, and urban forests in Helsinki, Finland. Models captured seasonal and annual variations well. Trees had higher sequestration rates than lawns, and irrigation often enhanced carbon sinks.
Gabrielle E. Kleber, Leonard Magerl, Alexandra V. Turchyn, Stefan Schloemer, Mark Trimmer, Yizhu Zhu, and Andrew Hodson
Biogeosciences, 22, 659–674, https://doi.org/10.5194/bg-22-659-2025, https://doi.org/10.5194/bg-22-659-2025, 2025
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Our research on Svalbard shows that glacier melt rivers can transport large amounts of methane, a potent greenhouse gas. By studying a glacier over one summer, we found that its river was highly concentrated in methane, suggesting that rivers could provide a significant source of methane emissions as the Arctic warms and glaciers melt. This is the first time such emissions have been measured on Svalbard, indicating a wider environmental concern as such processes are occurring across the Arctic.
Martino E. Malerba, Blake Edwards, Lukas Schuster, Omosalewa Odebiri, Josh Glen, Rachel Kelly, Paul Phan, Alistair Grinham, and Peter I. Macreadie
EGUsphere, https://doi.org/10.31219/osf.io/54rd2, https://doi.org/10.31219/osf.io/54rd2, 2025
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The Pondi is a cost-effective, lightweight logger designed for long-term monitoring of carbon dioxide, methane, and nitrous oxide emissions in both terrestrial and aquatic ecosystems. It addresses key challenges in greenhouse gas monitoring by providing an automated, low-cost, solar-powered solution with cloud connectivity and real-time analytics. Its robust design enables deployment in diverse environmental conditions, supporting large-scale, high-resolution emission assessments.
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.
Eva-Marie Metz, Sanam Noreen Vardag, Sourish Basu, Martin Jung, and André Butz
Biogeosciences, 22, 555–584, https://doi.org/10.5194/bg-22-555-2025, https://doi.org/10.5194/bg-22-555-2025, 2025
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We estimate CO2 fluxes in semiarid southern Africa from 2009 to 2018 based on satellite CO2 measurements and atmospheric inverse modeling. By selecting process-based vegetation models, which agree with the satellite CO2 fluxes, we find that soil respiration mainly drives the seasonality, whereas photosynthesis substantially influences the interannual variability. Our study emphasizes the need for better representation of the response of semiarid ecosystems to soil rewetting in vegetation models.
Ella Kivimäki, Tuula Aalto, Michael Buchwitz, Kari Luojus, Jouni Pulliainen, Kimmo Rautiainen, Oliver Schneising, Anu-Maija Sundström, Johanna Tamminen, Aki Tsuruta, and Hannakaisa Lindqvist
EGUsphere, https://doi.org/10.5194/egusphere-2025-249, https://doi.org/10.5194/egusphere-2025-249, 2025
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We investigate how environmental variables influencing natural methane fluxes explain the large-scale seasonal variability of satellite-observed methane at Northern high latitudes. Our findings show that soil moisture, snow cover, and soil temperature have the strongest influence, with snowmelt playing a surprisingly significant role, likely through soil isolation and wetting. This study highlights the value of multi-satellite observations for understanding large-scale wetland emissions.
Jérémy Mayen, Pierre Polsenaere, Aurore Regaudie de Gioux, Jonathan Deborde, Karine Collin, Yoann Le Merrer, Élodie Foucault, Vincent Ouisse, Laurent André, Marie Arnaud, Pierre Kostyrka, Éric Lamaud, Gwenaël Abril, and Philippe Souchu
EGUsphere, https://doi.org/10.5194/egusphere-2025-335, https://doi.org/10.5194/egusphere-2025-335, 2025
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In a salt marsh, we performed seasonal 24-h cycles to look for aquatic metabolism influence on water carbon dynamics and net ecosystem CO2 exchanges (NEE). From high to low tide in winter, marsh anaerobic respiration induced the highest levels of dissolved inorganic carbon and alkalinity. On the contrary, in spring and summer, marsh primary production led to CO2-depleted water exportations downstream. Aquatic heterotrophy at high tide can influence NEE during the highest immersion levels only.
Tuula Aalto, Aki Tsuruta, Jarmo Mäkelä, Jurek Müller, Maria Tenkanen, Eleanor Burke, Sarah Chadburn, Yao Gao, Vilma Mannisenaho, Thomas Kleinen, Hanna Lee, Antti Leppänen, Tiina Markkanen, Stefano Materia, Paul A. Miller, Daniele Peano, Olli Peltola, Benjamin Poulter, Maarit Raivonen, Marielle Saunois, David Wårlind, and Sönke Zaehle
Biogeosciences, 22, 323–340, https://doi.org/10.5194/bg-22-323-2025, https://doi.org/10.5194/bg-22-323-2025, 2025
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Wetland methane responses to temperature and precipitation were studied in a boreal wetland-rich region in northern Europe using ecosystem models, atmospheric inversions, and upscaled flux observations. The ecosystem models differed in their responses to temperature and precipitation and in their seasonality. However, multi-model means, inversions, and upscaled fluxes had similar seasonality, and they suggested co-limitation by temperature and precipitation.
Zhen Zhang, Benjamin Poulter, Joe R. Melton, William J. Riley, George H. Allen, David J. Beerling, Philippe Bousquet, Josep G. Canadell, Etienne Fluet-Chouinard, Philippe Ciais, Nicola Gedney, Peter O. Hopcroft, Akihiko Ito, Robert B. Jackson, Atul K. Jain, Katherine Jensen, Fortunat Joos, Thomas Kleinen, Sara H. Knox, Tingting Li, Xin Li, Xiangyu Liu, Kyle McDonald, Gavin McNicol, Paul A. Miller, Jurek Müller, Prabir K. Patra, Changhui Peng, Shushi Peng, Zhangcai Qin, Ryan M. Riggs, Marielle Saunois, Qing Sun, Hanqin Tian, Xiaoming Xu, Yuanzhi Yao, Yi Xi, Wenxin Zhang, Qing Zhu, Qiuan Zhu, and Qianlai Zhuang
Biogeosciences, 22, 305–321, https://doi.org/10.5194/bg-22-305-2025, https://doi.org/10.5194/bg-22-305-2025, 2025
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This study assesses global methane emissions from wetlands between 2000 and 2020 using multiple models. We found that wetland emissions increased by 6–7 Tg CH4 yr-1 in the 2010s compared to the 2000s. Rising temperatures primarily drove this increase, while changes in precipitation and CO2 levels also played roles. Our findings highlight the importance of wetlands in the global methane budget and the need for continuous monitoring to understand their impact on climate change.
Lorena Carrasco-Barea, Dolors Verdaguer, Maria Gispert, Xavier D. Quintana, Hélène Bourhis, and Laura Llorens
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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Carbon dioxide fluxes have been measured seasonally in four plant species in a Mediterranean non-tidal salt marsh, highlighting the high carbon removal potential that these species have. Carbon dioxide and methane emissions from soil showed high variability among the habitats studied, and they were generally higher than those observed in tidal salt marshes. Our results are important for making more accurate predictions regarding carbon emissions from these ecosystems.
Ekaterina Ezhova, Topi Laanti, Anna Lintunen, Pasi Kolari, Tuomo Nieminen, Ivan Mammarella, Keijo Heljanko, and Markku Kulmala
Biogeosciences, 22, 257–288, https://doi.org/10.5194/bg-22-257-2025, https://doi.org/10.5194/bg-22-257-2025, 2025
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Machine learning (ML) models are gaining popularity in biogeosciences. They are applied as gap-filling methods and used to upscale carbon fluxes to larger areas. Here we use explainable artificial intelligence (XAI) methods to elucidate the performance of machine learning models for carbon dioxide fluxes in boreal forests. We show that statistically equal models treat input variables differently. XAI methods can help scientists make informed decisions when applying ML models in their research.
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.
Alouette van Hove, Kristoffer Aalstad, Vibeke Lind, Claudia Arndt, Vincent Odongo, Rodolfo Ceriani, Francesco Fava, John Hulth, and Norbert Pirk
EGUsphere, https://doi.org/10.5194/egusphere-2024-3994, https://doi.org/10.5194/egusphere-2024-3994, 2025
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Research on methane emissions from African livestock is limited. We used a probabilistic method fusing drone and flux tower observations with an atmospheric model to estimate emissions from various herds. This approach proved robust under non-stationary wind conditions and effective in estimating emissions as low as 100 g h-1. We also detected herd locations using spectral anomalies in satellite data. Our approach can be used to estimate diverse sources, thereby improving emission inventories.
Boris Ťupek, Aleksi Lehtonen, Stefano Manzoni, Elisa Bruni, Petr Baldrian, Etienne Richy, Bartosz Adamczyk, Bertrand Guenet, and Raisa Mäkipää
EGUsphere, https://doi.org/10.5194/egusphere-2024-3813, https://doi.org/10.5194/egusphere-2024-3813, 2024
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We explored soil microbial respiration (Rh) kinetics of low-dose and long-term N fertilization in N-limited boreal forest in connection to CH₄, and N₂O fluxes, soil, and tree C sinks. The insights show that N fertilization effects C retention in boreal forest soils through modifying Rh sensitivities to soil temperature and moisture. The key findings reveal that N-enriched soils exhibited reduced sensitivity of Rh to moisture, which on annual level contributes to enhanced soil C sequestration.
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.
Rui Su, Kexin Li, Nannan Wang, Fenghui Yuan, Ying Zhao, Yunjiang Zuo, Ying Sun, Liyuan He, Xiaofeng Xu, and Lihua Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3347, https://doi.org/10.5194/egusphere-2024-3347, 2024
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This research examines the effect of sulfate on methane oxidation in soil, finding that sulfate may facilitate methane oxidation. Considering methane's role as a greenhouse gas and rising sulfate deposition, the study aims to predict changes in methane oxidation due to acid deposition. Future experiments will explore microbial mechanisms, as sulfate reduces methane emissions while enhancing its consumption, providing insights for mitigation strategies.
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.
Olivier Bouriaud, Ernst-Detlef Schulze, Konstantin Gregor, Issam Bourkhris, Peter Högberg, Roland Irslinger, Phillip Papastefanou, Julia Pongratz, Anja Rammig, Riccardo Valentini, and Christian Körner
EGUsphere, https://doi.org/10.5194/egusphere-2024-3092, https://doi.org/10.5194/egusphere-2024-3092, 2024
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The impact of harvesting on forests' carbon sink capacities is debated. One view is that their sink strength is resilient to harvesting, the other that it disrupts these capacities. Our work shows that leaf area index (LAI) has been overlooked in this discussion. We found that temperate forests' carbon uptake is largely insensitive to variations in LAI beyond about 4 m² m-², but that forests operate at higher levels.
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.
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.
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.
Yélognissè Agbohessou, Claire Delon, Manuela Grippa, Eric Mougin, Daouda Ngom, Espoir Koudjo Gaglo, Ousmane Ndiaye, Paulo Salgado, and Olivier Roupsard
Biogeosciences, 21, 2811–2837, https://doi.org/10.5194/bg-21-2811-2024, https://doi.org/10.5194/bg-21-2811-2024, 2024
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Emissions of greenhouse gases in the Sahel are not well represented because they are considered weak compared to the rest of the world. However, natural areas in the Sahel emit carbon dioxide and nitrous oxides, which need to be assessed because of extended surfaces. We propose an assessment of such emissions in Sahelian silvopastoral systems and of how they are influenced by environmental characteristics. These results are essential to inform climate change strategies in the region.
Merit van den Berg, Thomas M. Gremmen, Renske J. E. Vroom, Jacobus van Huissteden, Jim Boonman, Corine J. A. van Huissteden, Ype van der Velde, Alfons J. P. Smolders, and Bas P. van de Riet
Biogeosciences, 21, 2669–2690, https://doi.org/10.5194/bg-21-2669-2024, https://doi.org/10.5194/bg-21-2669-2024, 2024
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Drained peatlands emit 3 % of the global greenhouse gas emissions. Paludiculture is a way to reduce CO2 emissions while at the same time generating an income for landowners. The side effect is the potentially high methane emissions. We found very high methane emissions for broadleaf cattail compared with narrowleaf cattail and water fern. The rewetting was, however, effective to stop CO2 emissions for all species. The highest potential to reduce greenhouse gas emissions had narrowleaf cattail.
Thea H. Heimdal, Galen A. McKinley, Adrienne J. Sutton, Amanda R. Fay, and Lucas Gloege
Biogeosciences, 21, 2159–2176, https://doi.org/10.5194/bg-21-2159-2024, https://doi.org/10.5194/bg-21-2159-2024, 2024
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Measurements of ocean carbon are limited in time and space. Machine learning algorithms are therefore used to reconstruct ocean carbon where observations do not exist. Improving these reconstructions is important in order to accurately estimate how much carbon the ocean absorbs from the atmosphere. In this study, we find that a small addition of observations from the Southern Ocean, obtained by autonomous sampling platforms, could significantly improve the reconstructions.
Guilherme L. Torres Mendonça, Julia Pongratz, and Christian H. Reick
Biogeosciences, 21, 1923–1960, https://doi.org/10.5194/bg-21-1923-2024, https://doi.org/10.5194/bg-21-1923-2024, 2024
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We study the timescale dependence of airborne fraction and underlying feedbacks by a theory of the climate–carbon system. Using simulations we show the predictive power of this theory and find that (1) this fraction generally decreases for increasing timescales and (2) at all timescales the total feedback is negative and the model spread in a single feedback causes the spread in the airborne fraction. Our study indicates that those are properties of the system, independently of the scenario.
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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