Spatiotemporal distribution patterns of dissolved methane in lakes: How accurate are the current estimations of the diffusive flux path?
TLDR
In this article, the authors measured the spatiotemporal distribution of dissolved methane in a medium-sized freshwater lake and found that the diffusive flux of methane to the atmosphere strongly varies with location in the lake.Abstract:
[1] Lakes have been identified as an important source of atmospheric methane. Here the spatiotemporal distribution of dissolved methane was measured in a medium-sized freshwater lake. The data reveal that littoral zones (nearshore, shallow) are the predominant source of methane. Offshore-directed gradients of dissolved methane suggest the transport of methane from the nearshore zone to the pelagic epilimnion. The distribution patterns of epilimnetic methane were highly heterogeneous, independent of the mean lake-wide methane concentration. Consequently, the diffusive flux of methane to the atmosphere strongly varies with location in the lake. A comparison of the diffusive methane flux from different offshore sampling stations indicates that single-point measurements are not necessarily sufficient to estimate lake-wide emissions to the atmosphere accurately. Thus, spatially resolved measurements of methane emissions are needed to improve the reliability of estimates of the methane that lakes contribute to the global methane budget.read more
Citations
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Journal ArticleDOI
Oxic water column methanogenesis as a major component of aquatic CH4 fluxes.
Matthew J. Bogard,Paul A. del Giorgio,Lennie Boutet,Maria Carolina Garcia Chaves,Yves T. Prairie,Anthony Merante,Alison M. Derry +6 more
TL;DR: It is shown that oxic water methanogenesis is a significant component of the overall CH4 budget in a small, shallow lake, and evidence is provided that this pathway may be the main CH4 source in large, deep lakes and open oceans.
Journal ArticleDOI
Spatio-temporal variability of lake CH4 fluxes and its influence on annual whole lake emission estimates
Sivakiruthika Natchimuthu,Ingrid Sundgren,Magnus Gålfalk,Leif Klemedtsson,Patrick M. Crill,Åsa Danielsson,David Bastviken +6 more
TL;DR: In this article, the authors show that diffusive fluxes, ebullition and surface water CH4 are major sources of methane (CH4) to the atmosphere that contribute significantly to the global budget.
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Methane emissions from Amazonian Rivers and their contribution to the global methane budget.
Henrique O. Sawakuchi,David Bastviken,André Oliveira Sawakuchi,Alex V. Krusche,Maria Victoria Ramos Ballester,Jeffrey E. Richey +5 more
TL;DR: Estimates of CH4 flux from all tropical rivers and rivers globally were respectively, 19-51% to 31-84% higher than previous estimates, with large rivers of the Amazon accounting for 22-28% of global river CH4 emissions.
Journal ArticleDOI
Large‐scale patterns in summer diffusive CH4 fluxes across boreal lakes, and contribution to diffusive C emissions
TL;DR: It is concluded that global climate change and the resulting shifts in temperature will strongly influence lake CH4 fluxes across the boreal biome, but these climate effects may be altered by regional patterns in lake morphometry, nutrient status, and browning.
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Importance of the autumn overturn and anoxic conditions in the hypolimnion for the annual methane emissions from a temperate lake.
TL;DR: The authors' results provide evidence that not all of the stored methane is released to the atmosphere during the overturn period, however, the fraction of stored methane emitted to the sky during overturn may be substantially larger and the fractionof stored methane oxidized may be smaller than in the previous studies suggesting high oxidation losses of methane.
References
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Flux of Gases across the Air-Sea Interface
Peter S. Liss,P. G. Slater +1 more
TL;DR: In this paper, the use of a two-layer model to estimate the flux of various gases across the air-sea interface has been described, and the model has been used to estimate flux of different gases across different regions of the world.
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Journal ArticleDOI
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