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These fluxes are found to be in excellent agreement with coincident surface measurements within the aircraft’s sampling domain. Tubiello, Simona Castaldi, Robert B. The Arctic is important for the future carbon cycle, particularly due to the large carbon stocks in permafrost. We present the first assessment of CO 2 emissions from the Rajang River, the largest peat-draining river in Malaysia.
Short summary The quantitative importance of northern lakes in terrestrial carbon budgets is uncertain, as year-round observations of carbon fluxes are rare. The particles’ seasonal characteristics and sources were identified based on these data. Short summary An important feature of the Arctic is large spatial heterogeneity in active layer conditions.
Show only first author papers Show all papers. Short summary Digital photography has become a widely used tool for monitoring the vegetation phenology. We conclude that simple gas transfer models underestimate the emissions and more recent models should be used for global freshwater greenhouse gas emission gogo.
Soil moisture control over autumn season methane flux, Arctic Coastal Plain of Alaska, Biogeosciences, 9, —, https: Northern fens, methane flux and climatic change, Tellus B, 44, —, Recent studies have shown that many land surface models have biases in this area.
ENSO forcing of the CH 4 cycle is too small, episodic, and regional to force atmospheric trends, which are more likely caused by agricultural or industrial emissions. Longer growing seasons do not increase net carbon uptake in the northeastern Siberian tundra, J. Thus, OM decomposability needs to be interpreted against the paleoenvironmental gedron. Quantitative information stored in image pixels can be analysed automatically to track time-dependent phenomena, e.
Areas subjected to high ammonia emitted more N 2 O than expected. Short summary Modelling seasonal cycle at the coniferous forests poses a challenge. Application of artificial neural networks in tide-forecasting, Gubnar Eng. Optimization of the backpropagation algorithm for training multilayer perceptrons, Technical report, University of Koblenz, Insitute of Physics, Field intercomparison of four methane gas analyzers suitable for eddy covariance flux measurements, Biogeosciences, 10, —, https: This indicates challenges in spatial extrapolation of some of those plant and soil attributes that are relevant for regional ecosystem and global climate models.
The forest floor acted mainly as a small methane sink, but emission peaks were occasionally observed during spring and rainfall events.
A variable filter is applied using a multiple of the interquartile range. Large tundra methane burst during onset of freezing, Nature,—, We present a simple calculation algorithm to separate CH4 fluxes measured with closed chambers into diffusion- and ebullition-derived components, which helps gogks the identification of underlying dynamics and potential drivers.
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Short summary Based on the eddy covariance method we investigate the ecosystem—atmosphere exchange of CH 4 and CO 2 at a eutrophic shallow lake as a challenging ecosystem often evolving during peatland rewetting. Methane showed uneven seasonal trends in emissions, with some ecosystems emitting more methane during the dry season compared to the wet season. Chen, Mahta Moghaddam, Rolf H.
We find that ENSO explains less than one-third of the variability in CH 4 levels and their stable carbon isotopes, which constrain the source processes of emissions. Venter, Kerneels Jaars, Stefan J. It was used to study the seasonality of the carbon cycle in the Fenno-Scandinavian region. Therefore, the Rajang was only a moderate source of CO 2 to the atmosphere.
Although CH 4 efflux showed no apparent diel pattern, summer CH 4 efflux was significantly higher than that of the other three seasons.
Influence of high-frequency ambient pressure pumping on carbon dioxide efflux from soil. Short summary We examined the seasonal variation in diel hysteresis between soil respiration and temperature, and yedeon controlling factors in a desert-shrub ecosystem.
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Geoscientific Instrumentation, Methods and Data Systems. Yit Arn Teh, Wayne A.
Bullister, Macarena Burgos, David W. Short summary Monitoring ecosystems using low-cost time lapse cameras has gained wide interest among researchers worldwide.
Comprehensive comparison of gap-filling techniques for eddy covariance net carbon fluxes, Agr. Article Peer review Metrics Related articles. Connectionist approach to time series prediction: Methane production and oxidation potentials in relation to water table fluctuations in two boreal mires, Soil Biol.
Short summary Montane ecosystems in the southern Peruvian Andes were atmospheric sources of the greenhouse gas nitrous oxide, exceeding prior emissions estimates from bottom-up process models.
Biogeosciences, 14,https: Site specific differences were identified for soil respiration coefficients, plant radiation-use efficiencies and plant storage fractions for spring regrowth.
Borges, Ian Brown, John Gunnr. Recognizing changing seasonal patterns using artificial neural networks, J. Both open water and emergent vegetation are net emitters of CH 4 and CO 2but with strikingly different release rates. In this study, we present the model and results of its testing.
Bai, Zhihong Xu, Simeon J. Using a modified floating chamber the exchange can be measured automatically with a minimum of effort. Short summary To determine the variability between independent measurements of dissolved methane and nitrous oxide, seawater samples were analyzed by multiple laboratories. Journal metrics Journal metrics IF 3.