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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Surface Water Microwave Product Series Version 3: A Near-Real Time and 25-Year Historical Global Inundated Area Fraction Time Series From Active and Passive Microwave Remote Sensing
TL;DR: This letter summarizes substantial modifications made to the Surface Water Microwave Product Series (SWAMPS), a coarse-resolution global inundated area fraction data record derived from active and passive microwave remote sensing, and provides for the enhanced scientific utility of the full 25+ years of data records.
Journal ArticleDOI
Unimodal Response of Soil Methane Consumption to Increasing Nitrogen Additions.
Yunfeng Peng,Guanqin Wang,Fei Li,Guibiao Yang,Kai Fang,Li Liu,Shuqi Qin,Dianye Zhang,Guoying Zhou,Huajun Fang,Xuejun Liu,Chunyan Liu,Yuanhe Yang +12 more
TL;DR: The unimodal relationship between CH4 uptake and N addition rate should be considered in biogeochemistry models for accurately predicting soil CH4 consumption under global N enrichment.
Journal ArticleDOI
Paleo-Perspectives on Potential Future Changes in the Oxidative Capacity of the Atmosphere Due to Climate Change and Anthropogenic Emissions
TL;DR: The oxidizing capacity of the atmosphere, defined as the global mean tropospheric abundance of the hydroxyl radical (OH·), strongly influences air pollution by controlling the lifetimes of gaseous pollutants and the production of particulate matter.
Journal ArticleDOI
Studying the spatial variability of methane flux with five eddy covariance towers of varying height
Olli Peltola,Arjan Hensen,L. Belelli Marchesini,Carole Helfter,Fred C. Bosveld,W.C.M. van den Bulk,Sami Haapanala,J. van Huissteden,T. Laurila,Anders Lindroth,Eiko Nemitz,Thomas Röckmann,Alex Vermeulen,Alex Vermeulen,Ivan Mammarella +14 more
TL;DR: In this paper, the spatial representativeness of eddy covariance (EC) methane (CH4) measurements was examined by comparing parallel CH4 fluxes from three short (6 m) towers separated by a few kilometres and from two higher levels (20 m and 60 m) at one location.
Journal ArticleDOI
Draft Genome Sequence of Uncultured Upland Soil Cluster Gammaproteobacteria Gives Molecular Insights into High-Affinity Methanotrophy.
Collin R. Edwards,Tullis C. Onstott,Jennifer M. Miller,Jessica B. Wiggins,We Wang,Charles Kai-Wu Lee,S. Craig Cary,Stephen B. Pointing,Maggie C. Y. Lau +8 more
TL;DR: A near-complete genome of uncultured upland soil cluster Gammaproteobacteria that oxidize CH4 at <2.5 ppmv was obtained from incubated Antarctic mineral cryosols and can help resolve the mysteries about their phylogenetic affiliation and metabolic potential.
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