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5 results for “methane uptake”
Data from: Soil moisture threshold of methane uptake in alpine ecosystems
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Global soil methane uptake inferred from global field measurements
<p>Soil methane (CH<sub>4</sub>) uptake is an important sink in the global methane budget. However, both the magnitude and the dynamics of global soil CH<sub>4</sub> uptake remain highly uncertain. Here, by compiling an extensive data set of 6899 site-months of soil CH<sub>4</sub> fluxes observed at 682 sites, we use a machine-learning algorithm (Random Forest) to provide a data-driven estimate of global soil CH<sub>4</sub> uptake each month from 1981 to 2018. Varying the combination of predictors, we construct 9 different simulations for three landcover types (Forests, Grasslands, Croplands). The dataset uploaded is the mean of 9 simulations after calculating the area-weighted average of CH<sub>4 </sub>flux of three landcover types.</p>
Data from: Increased annual methane uptake driven by warmer winters in an alpine meadow
<p>Pronounced non-growing season warming and changes in soil freeze-thaw (F-T) cycles can dramatically alter net methane (CH<sub>4</sub>) exchange rates between soils and the atmosphere. However, the magnitudes and drivers of warming impacts on CH<sub>4</sub> uptake in different stages of the F-T cycle are poorly understood in cold alpine ecosystems, which have been found to be a net sink of atmospheric CH<sub>4</sub>. Here, we reported a year-round ecosystem daily CH<sub>4</sub> uptake in an alpine meadow on the Qinghai-Tibetan Plateau after a five-year warming experiment that included a control, a low-level warming treatment (+2.4℃ at 5 cm soil depth), and a high-level warming treatment (+4.5℃ at 5 cm soil depth). We found that warming shortened the F-T cycle under the low-level warming and soils did not freeze under the high-level warming. Although both warming treatments increased the mean CH<sub>4</sub> uptake rate, only the high-level warming significantly increased annual CH<sub>4</sub> uptake compared to the control. The warming-induced stimulation of CH<sub>4</sub> uptake mainly occurred in the cold season, which was mostly during spring thaw under low-level warming and during the frozen winter under high-level warming due to a longer period with thawed soil. We also found that warming significantly stimulated daily CH<sub>4</sub> uptake mainly by reducing near-surface soil water content in the warm season, whereas both soil water content and temperature controlled daily CH<sub>4</sub> uptake in different ways during the autumn freeze, frozen winter, and spring thaw periods of the control. Our study revealed a strong warming effect on CH<sub>4</sub> uptake during the entire F-T cycle in the alpine meadow, especially the unfrozen winter. Our results also suggested the important roles of soil pH, available phosphorus, and methanotroph abundance in regulating annual CH<sub>4</sub> uptake in response to warming, which should be incorporated into biogeochemical models for accurately forecasting CH<sub>4</sub> fluxes under future climate scenarios.</p>
Data from: Methane emission offsets carbon dioxide uptake in a small productive lake
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Data from: Increased annual methane uptake driven by warmer winters in an alpine meadow
Open the record for dataset details and reuse information.
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International Brain Laboratory public data
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OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.