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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Asymmetric response of soil methane uptake rate to land degradation and restoration: Data synthesis
TL;DR: A global meta-analysis with a database of 228 observations from 83 studies found that land degradation significantly decreased the capacity of soil CH4 uptake, except the conversion of pasture to cropland where the soilCH4 uptake rate showed no response.
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Large changes in biomass burning over the last millennium inferred from paleoatmospheric ethane in polar ice cores
TL;DR: The results indicate that biomass burning emissions exceeded modern levels during the Medieval Period but then decreased substantially during the Little Ice Age, indicating the sensitivity of biomass burning to climate during the preindustrial era.
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Heavy metal reduction coupled to methane oxidation:Mechanisms, recent advances and future perspectives
TL;DR: The functional microorganisms and possible mechanisms are detailed in groups under aerobic, hypoxic and anaerobic conditions, and the knowledge gaps and opportunities for future research are identified.
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Soil Greenhouse Gas Fluxes From Maize Production Under Different Soil Fertility Management Practices in East Africa
Joseph M. Macharia,Joseph M. Macharia,David E. Pelster,David E. Pelster,Felix K. Ngetich,Chris A. Shisanya,Monicah Mucheru-Muna,Daniel N. Mugendi +7 more
Journal ArticleDOI
On the role of trend and variability in the hydroxyl radical (OH) in the global methane budget
Yuanhong Zhao,Marielle Saunois,Phillippe Bousquet,Xin Lin,Xin Lin,Antoine Berchet,Michaela I. Hegglin,Josep G. Canadell,Robert B. Jackson,Makoto Deushi,Patrick Jöckel,Douglas E. Kinnison,Ole Kirner,Sarah A. Strode,Sarah A. Strode,Simone Tilmes,Edward J. Dlugokencky,Bo Zheng +17 more
TL;DR: In this article, the authors analyzed the hydroxyl radical (OH) fields simulated by the model ensemble of the Chemistry-Climate Model Initiative (CCMI) and found that ignoring the negative anomaly of OH during the El Nino years leads to a large overestimation of the increase in global CH4 emissions by up to 10 times to match the observed CH4 increase over these years.
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