Three decades of global methane sources and sinks
S. Kirschke,Philippe Bousquet,Philippe Ciais,Marielle Saunois,Josep G. Canadell,Edward J. Dlugokencky,Peter Bergamaschi,Daniel Bergmann,Donald R. Blake,Lori Bruhwiler,Philip Cameron-Smith,Simona Castaldi,Simona Castaldi,Frédéric Chevallier,Liang Feng,Annemarie Fraser,Martin Heimann,Elke L. Hodson,Sander Houweling,Béatrice Josse,Paul J. Fraser,Paul B. Krummel,Jean-Francois Lamarque,Ray L. Langenfelds,Corinne Le Quéré,Vaishali Naik,Simon O'Doherty,Paul I. Palmer,Isabelle Pison,David A. Plummer,Benjamin Poulter,Ronald G. Prinn,Matthew Rigby,Bruno Ringeval,Bruno Ringeval,Monia Santini,Martina Schmidt,Drew Shindell,Isobel J. Simpson,Renato Spahni,L. Paul Steele,Sarah A. Strode,Kengo Sudo,Sophie Szopa,Guido R. van der Werf,Apostolos Voulgarakis,Apostolos Voulgarakis,Michiel van Weele,Ray F. Weiss,J. E. Williams,Guang Zeng +50 more
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In this paper, the authors construct decadal budgets for methane sources and sinks between 1980 and 2010, using a combination of atmospheric measurements and results from chemical transport models, ecosystem models, climate chemistry models and inventories of anthropogenic emissions.Abstract:
Methane is an important greenhouse gas, responsible for about 20% of the warming induced by long-lived greenhouse gases since pre-industrial times. By reacting with hydroxyl radicals, methane reduces the oxidizing capacity of the atmosphere and generates ozone in the troposphere. Although most sources and sinks of methane have been identified, their relative contributions to atmospheric methane levels are highly uncertain. As such, the factors responsible for the observed stabilization of atmospheric methane levels in the early 2000s, and the renewed rise after 2006, remain unclear. Here, we construct decadal budgets for methane sources and sinks between 1980 and 2010, using a combination of atmospheric measurements and results from chemical transport models, ecosystem models, climate chemistry models and inventories of anthropogenic emissions. The resultant budgets suggest that data-driven approaches and ecosystem models overestimate total natural emissions. We build three contrasting emission scenarios-which differ in fossil fuel and microbial emissions-to explain the decadal variability in atmospheric methane levels detected, here and in previous studies, since 1985. Although uncertainties in emission trends do not allow definitive conclusions to be drawn, we show that the observed stabilization of methane levels between 1999 and 2006 can potentially be explained by decreasing-to-stable fossil fuel emissions, combined with stable-to-increasing microbial emissions. We show that a rise in natural wetland emissions and fossil fuel emissions probably accounts for the renewed increase in global methane levels after 2006, although the relative contribution of these two sources remains uncertain. © 2013 Macmillan Publishers Limited.read more
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Uncertainties in Isoprene Photochemistry and Emissions: Implications for the Oxidative Capacity of Past and Present Atmospheres and for Climate Forcing Agents
P. Achakulwisut,Loretta J. Mickley,Lee T. Murray,Lee T. Murray,Amos P. K. Tai,Jed O. Kaplan,Becky Alexander +6 more
TL;DR: In this paper, the sensitivity of estimates of the tropospheric oxidative capacity to uncertainties in isoprene emissions and photochemistry was evaluated in two climate transitions: from the Last Glacial Maximum (LGM, 19 000-23 000 years BP) to the pre-industrial (1770s) and from the preindustrial to the present day (1990s).
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Technical note: Rapid image-based field methods improve the quantification of termite mound structures and greenhouse-gas fluxes
Philipp A. Nauer,Eleonora Chiri,Eleonora Chiri,David de Souza,Lindsay B. Hutley,Stefan K. Arndt +5 more
TL;DR: In this article, two field methods, photogrammetry (PG) and cross-sectional image analysis, were used to quantify TM external and internal mound structure of 29 TMs of three termite species.
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Modelling methane formation in sediments of tropical lakes focusing on syntrophic acetate oxidation: dynamic and static carbon isotope equations.
TL;DR: In this paper, a mathematical description of cellulose conversion into methane and carbon dioxide in the anoxic sediments of three floodplain tropical lakes that were investigated before has been presented.
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Methane biofiltration using autoclaved aerated concrete as the carrier material
Giovanni Ganendra,Daniel Mercado-Garcia,Emma Hernandez-Sanabria,Pascal Boeckx,Adrian Ho,Nico Boon +5 more
TL;DR: Overall, an efficient methane biofilter performance could be obtained using AAC as the carrier material using autoclaved aerated concrete as a highly porous carrier material.
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Consumption of atmospheric methane by the Qinghai–Tibet Plateau alpine steppe ecosystem
Hanbo Yun,Hanbo Yun,Qingbai Wu,Qianlai Zhuang,Anping Chen,Tong Yu,Zhou Lyu,Yuzhhong Yang,Huijun Jin,Guo-Jun Liu,Yang Qu,Licheng Liu +11 more
TL;DR: In this paper, the authors reported results from five continuous year-round CH4 observations from a typical high-elevation steppe ecosystem in the Qinghai-Tibet plateau (QTP) permafrost region.
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