气候变化领域集成服务门户(CCPortal): Global and Regional CH4 Emissions for 1995–2013 Derived From Atmospheric CH4, δ13C-CH4, and δD-CH4 Observations and a Chemical Transport Model

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DOI	10.1029/2020JD032903
	Global and Regional CH4 Emissions for 1995–2013 Derived From Atmospheric CH4, δ13C-CH4, and δD-CH4 Observations and a Chemical Transport Model
	Fujita R.; Morimoto S.; Maksyutov S.; Kim H.-S.; Arshinov M.; Brailsford G.; Aoki S.; Nakazawa T.
发表日期	2020
ISSN	2169897X
卷号	125 期号:14
英文摘要	To better understand the current global CH4 budget, biogenic, fossil fuel, and biomass burning CH4 fluxes for the period 1995–2013 were inversely estimated from the observed mole fraction data of atmospheric CH4 using a three-dimensional chemical transport model. Then, forward simulations of carbon and hydrogen isotope ratios of atmospheric CH4 (δ13C-CH4 and δD-CH4) were conducted using the inversion fluxes to evaluate the source proportion of the global total CH4 emission. Model-simulated spatiotemporal variations of atmospheric CH4 reproduce the observational results well; however, the simulated δ13C-CH4 and δD-CH4 values significantly underestimate their observed values as a whole. This implies that the proportion of biogenic CH4 sources in the global CH4 emission, deduced by inverse modeling, is overestimated, although the proportion is fairly comparable with the medians of recent multiple CH4 inverse modeling. To reduce the disagreement between the observed and calculated isotope ratios, the CH4 fluxes of individual source categories were adjusted using our atmospheric δ13C-CH4 and δD-CH4 data observed at Arctic and Antarctic surface stations. The resultant global average biogenic, fossil fuel, and biomass burning CH4 fluxes over 2003–2012 are 346 ± 11, 162 ± 2, and 50 ± 2 TgCH4 year−1, respectively. It is also strongly suggested that the leveling-off of atmospheric CH4 in the early 2000s and the renewed growth after 2006/2007 are, respectively, explainable by the decrease in biogenic and biomass burning CH4 emissions for 2000–2006 and the increase in biogenic CH4 emissions after that period. These emission changes mainly originate in the tropics. ©2020. The Authors.
英文关键词	chemical transport model; global methane budget; isotope ratio; methane; mole fraction
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185906
作者单位	Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, Sendai, Japan; Department of Physics, Imperial College London, London, United Kingdom; National Institute for Environmental Studies, Tsukuba, Japan; Pusan National University, Pusan, South Korea; V.E. Zuev Institute of Atmospheric Optics, Russian Academy of Sciences, Siberian Branch, Tomsk, Russian Federation; National Institute of Water and Atmospheric Research, New Zealand
推荐引用方式 GB/T 7714	Fujita R.,Morimoto S.,Maksyutov S.,等. Global and Regional CH4 Emissions for 1995–2013 Derived From Atmospheric CH4, δ13C-CH4, and δD-CH4 Observations and a Chemical Transport Model[J],2020,125(14).
APA	Fujita R..,Morimoto S..,Maksyutov S..,Kim H.-S..,Arshinov M..,...&Nakazawa T..(2020).Global and Regional CH4 Emissions for 1995–2013 Derived From Atmospheric CH4, δ13C-CH4, and δD-CH4 Observations and a Chemical Transport Model.Journal of Geophysical Research: Atmospheres,125(14).
MLA	Fujita R.,et al."Global and Regional CH4 Emissions for 1995–2013 Derived From Atmospheric CH4, δ13C-CH4, and δD-CH4 Observations and a Chemical Transport Model".Journal of Geophysical Research: Atmospheres 125.14(2020).