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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Effect of elevated atmospheric CO2 concentration on the activity, abundance and community composition of aerobic methanotrophs in paddy soils
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Biosignature False Positives
Chester E. Harman,Chester E. Harman,Chester E. Harman,Shawn Domagal-Goldman,Shawn Domagal-Goldman +4 more
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Haijun Peng,Qian Guo,Hanwei Ding,Bing Hong,Bing Hong,Yongxuan Zhu,Yetang Hong,Cheng Cai,Yu Wang,Linggui Yuan +9 more
TL;DR: In this article, an eddy covariance (EC) tower with a LI-7700 open-path CH4 analyzer was established on Hongyuan Peatland to assess the magnitudes of daily and seasonal variations in CH4 flux in this area.
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Alexander S Savvichev,Igor I Rusanov,Vitaly V. Kadnikov,A. V. Beletskii,N. V. Ravin,N. V. Pimenov +5 more
TL;DR: In this paper, a geochemical, biogeochemical, and molecular genetic investigation of the bottom sediments of the Yamal sector of the Kara Sea was carried out, and high-throughput sequencing of the 16S rRNA genes was used to reveal the physiological groups of microorganisms responsible for the processes of methane production and oxidation, sulfate reduction, and oxidation of reduced sulfur compounds.
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Deriving Temporal and Vertical Distributions of Methane in Xianghe Using Ground-based Fourier Transform Infrared and Gas-analyzer Measurements
Denghui Ji,Minqiang Zhou,Pucai Wang,Yang Yang,Yang Yang,Ting Wang,Xiaoyu Sun,Christian Hermans,Bo Yao,Gengchen Wang +9 more
TL;DR: In this article, a ground-based high-resolution Fourier transform infrared spectrometer (FTIR), the Bruker IFS 125HR, along with an in-situ instrument, the Picarro G2301, were deployed in Xianghe County (39.8°N,117.0°E), Hebei Province, China.
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