Cross continental increase in methane ebullition under climate change

Aben, Ralf; Barros, Nathan; Donk, Ellen Van; Frenken, Thijs; Hilt, Sabine; Kazanjian, Garabet; Lamers, Leon P. M.; Peeters, E.T.H.M.; Roelofs, J.G.M.; Domis, Lisette de Senerpont; Stephan, Susanne; Velthuis, Mandy; Waal, Dedmer B. Van de; Wik, M.; Thornton, Brett F.; Wilkinson, J.; DelSontro, Tonya; Kosten, Sarian

doi:10.1038/s41467-017-01535-y

Cited by 179 publications

(185 citation statements)

References 69 publications

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“…), mainly due to increased ebullition. This result corroborates findings in other systems in various climate regions where temperature‐induced exponential increases in ebullition were observed (Aben et al ). Nutrients and organic C limitation may constrain sediment CH 4 release and thereby impede its increase with warming (Kelly and Chynoweth ; Schwarz et al ; DelSontro et al ).…”

Section: Discussionsupporting

confidence: 92%

Seasonal and diel variation in greenhouse gas emissions from an urban pond and its major drivers

Bergen

Barros

Mendonça

et al. 2019

Limnology & Oceanography

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Small water systems are important hotspots of greenhouse gas (GHG) emission, but estimates are poorly constrained as data are scarce. Small ponds are often constructed in urban areas, where they receive large amounts of nutrients and therefore tend to be highly productive. Here, we investigated GHG emissions, seasonal and diel variation, and net ecosystem production (NEP) from an urban pond. In monthly 24‐h field campaigns during 11 months, diffusive water–atmosphere methane (CH4) and carbon dioxide (CO2) fluxes and CH4 ebullition and oxidation were quantified. With oxygen (O2) measurements, NEP was assessed. The pond was a net GHG source the entire year, with an emission of 3.4 kg CO2 eq m−2 yr−1. The dominant GHG emission pathway was CH4 ebullition (bubble flux, 50%), followed by diffusive emissions of CO2 (38%) and CH4 (12%). Sediment CH4 release was primarily driven by temperature and especially ebullition increased exponentially above a temperature threshold of 15°C. The pond's atmospheric CO2 exchange was not related to NEP or temperature but likely to a high allochthonous carbon (C) input via runoff and anaerobic mineralization of C. We expect urban ponds to show a large increase in GHG emission with increasing temperature, which should be considered carefully when constructing ponds in urban areas. Emissions may partly be counteracted by pond management focusing on a reduction of nutrient and organic matter input.

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Section: Discussionsupporting

confidence: 92%

Seasonal and diel variation in greenhouse gas emissions from an urban pond and its major drivers

Bergen

Barros

Mendonça

et al. 2019

Limnology & Oceanography

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“…Temperature itself is also a major driver of ebullition, with mesocosm experiments revealing that ebullition rates can increase from ~ 6% to 20% per 1°C increase in temperature (Aben et al ). During C1, the warm shallow water column would likely sustain high microbial metabolism rates, which is consistent with positive significant relationships between temperature and ebullition rates (Fig.…”

Section: Discussionmentioning

confidence: 99%

Wetland methane emissions dominated by plant‐mediated fluxes: Contrasting emissions pathways and seasons within a shallow freshwater subtropical wetland

Jeffrey

Maher

Johnston

et al. 2019

Limnology & Oceanography

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Wetlands represent the largest natural source of methane; however, very few studies have simultaneously quantified the three main atmospheric flux pathways (i.e., diffusive, ebullition, and plant‐mediated). Unlike better‐studied northern hemisphere systems, many Australian subtropical wetlands undergo extreme wet/dry oscillations, which may strongly impact methane dynamics. We assessed diurnal methane emissions of multiple pathways during three distinct seasonal events within an Australian freshwater wetland. Six‐fold higher methane emissions occurred during summer compared to autumn floods (which followed an extensive dry‐period) and winter/cool conditions. Over three seasons, diffusion represented the highest average areal fluxes (25.9 ± 73.2 mmol m−2 d−1) but were within range of fluxes through water lily aerenchyma (20.8 ± 41.5 mmol m−2 d−1). Average ebullition rates were 5.5 ± 9.7 mmol m−2 d−1. Water column CH4 displayed high spatiotemporal variability, ranging from 55.0 to 253.5 μmol L−1. Time series δ13C–CH4 isotope measurements revealed an oxidation fraction of ~ 15% at night‐time and ~ 36% during day‐time, and night‐time diffusive fluxes were consistently ~ three‐fold higher than day‐time fluxes. By aggregating seasons and weighting for changes in lily coverage, plant‐mediated fluxes accounted for ~ 59% of the annual methane emissions, whereas ebullition and diffusion each accounted for ~ 20%. The up‐scaled annual area‐weighted wetland methane flux (combined pathways) was 27.3 ± 36.7 mmol m−2 d−1. We contend that water lilies (Nymphaea sp.) are the significant carbon source, mediator, and conduit for methane fluxes in this system, and the extremely large seasonal variability of methane emissions reflect dynamic redox oscillations driven by oscillating wet and dry conditions.

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“…Ebullition was the major emission pathway for CH 4 , accounting for 77% of the total flux for fish, and 87% for fishless mesocosms. Ebullitive fluxes are known to be strongly influenced by warming, often even more so than diffusive fluxes (Aben et al., ). Ebullition was not related to temperature in our mesocosms, which may be explained by a sudden drop in air pressure in April (from 10,208 hPa in April to 10,129 hPa in May) triggering bubble release under relatively cool conditions (10.8 ± 0.11°C).…”

Section: Discussionmentioning

confidence: 99%

“…As ebullition is an important GHG emission pathway (Bastviken, Cole, Pace & Tranvik, ; DelSontro et al., ; and also confirmed by our data), with a high variation in intensity across systems (e.g. Aben et al., ), insight in factors regulating ebullition is vital to accurately predict total GHG emissions from different systems.…”

Section: Discussionmentioning

confidence: 99%

Benthivorous fish bioturbation reduces methane emissions, but increases total greenhouse gas emissions

et al. 2018

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Globally, aquatic systems face increasing challenges with respect to increased greenhouse gas (GHG) emissions, eutrophication and strongly altered fish community composition. Although it is known that benthivorous fish can influence sediment and water column biogeochemistry, studies showing causal relationships are largely lacking. Here, we used a mesocosm approach with Common carp (Cyprinus carpio) to unravel the effects of bioturbation on GHG and nutrient dynamics. We hypothesised that fish bioturbation decreases methane (CH4) emissions and increases carbon dioxide (CO2) emissions by increased sediment oxygenation. Additionally, lower phosphorus (P) mobilisation was expected due to increased binding to ferric iron (Fe3+). We found that benthivorous fish increased water turbidity, and reduced CH4 diffusion to the atmosphere by 33%, and ebullition by 67%, probably because of sediment oxygenation. Simultaneously, however, CO2 emissions increased due to higher aerobic decomposition, leading to higher overall GHG emissions. In contrast to our hypothesis, we did not find indications of bioturbation affecting P mobilisation from the sediment, probably because P binding was already high in the control treatment as a result of high porewater Fe:P ratios. We conclude that bioturbation by fish has strong effects on GHG emissions as a result of higher overall decomposition rates offsetting reduced CH4 emissions. Depending on porewater Fe:P ratios, benthivorous fish may additionally reduce P mobilisation.

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Cross continental increase in methane ebullition under climate change

Cited by 179 publications

References 69 publications

Seasonal and diel variation in greenhouse gas emissions from an urban pond and its major drivers

Seasonal and diel variation in greenhouse gas emissions from an urban pond and its major drivers

Wetland methane emissions dominated by plant‐mediated fluxes: Contrasting emissions pathways and seasons within a shallow freshwater subtropical wetland

Benthivorous fish bioturbation reduces methane emissions, but increases total greenhouse gas emissions

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