气候变化领域集成服务门户(CCPortal): Estimating 2010-2015 anthropogenic and natural methane emissions in Canada using ECCC surface and GOSAT satellite observations

CCPortal

DOI	10.5194/acp-21-18101-2021
	Estimating 2010-2015 anthropogenic and natural methane emissions in Canada using ECCC surface and GOSAT satellite observations
	Baray S.; Jacob D.J.; Maasakkers J.D.; Sheng J.-X.; Sulprizio M.P.; Jones D.B.A.; Bloom A.A.; McLaren R.
发表日期	2021
ISSN	1680-7316
起始页码	18101
结束页码	18121
卷号	21 期号:23
英文摘要	Methane emissions in Canada have both anthropogenic and natural sources. Anthropogenic emissions are estimated to be 4.1g Tgg a-1 from 2010-2015 in the National Inventory Report submitted to the United Nation's Framework Convention on Climate Change (UNFCCC). Natural emissions, which are mostly due to boreal wetlands, are the largest methane source in Canada and highly uncertain, on the order of g 1/4g 20g Tgg a-1 in biosphere process models. Aircraft studies over the last several years have provided snapshot emissions that conflict with inventory estimates. Here we use surface data from the Environment and Climate Change Canada (ECCC) in situ network and space-borne data from the Greenhouse Gases Observing Satellite (GOSAT) to determine 2010-2015 anthropogenic and natural methane emissions in Canada in a Bayesian inverse modelling framework. We use GEOS-Chem to simulate anthropogenic emissions comparable to the National Inventory and wetlands emissions using an ensemble of WetCHARTS v1.0 scenarios in addition to other minor natural sources. We conduct a comparative analysis of the monthly natural emissions and yearly anthropogenic emissions optimized by surface and satellite data independently. Mean 2010-2015 posterior emissions using ECCC surface data are 6.0g ±g 0.4g Tgg a-1 for total anthropogenic and 11.6g ±g 1.2g Tgg a-1 for total natural emissions. These results agree with our posterior emissions of 6.5g ±g 0.7g Tgg a-1 for total anthropogenic and 11.7g ±g 1.2g Tgg a-1 for total natural emissions using GOSAT data. The seasonal pattern of posterior natural emissions using either dataset shows slower to start emissions in the spring and a less intense peak in the summer compared to the mean of WetCHARTS scenarios. We combine ECCC and GOSAT data to characterize limitations towards sectoral and provincial-level inversions. We estimate energyg +g agriculture emissions to be 5.1g ±g 1.0g Tgg a-1, which is 59g % higher than the national inventory. We attribute 39g % higher anthropogenic emissions to Western Canada than the prior. Natural emissions are lower across Canada. Inversion results are verified against independent aircraft data and surface data, which show better agreement with posterior emissions. This study shows a readjustment of the Canadian methane budget is necessary to better match atmospheric observations with lower natural emissions partially offset by higher anthropogenic emissions. © Copyright:
语种	英语
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246372
作者单位	Centre for Atmospheric Chemistry, York University, Toronto, Canada; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; SRON Netherlands Institute for Space Research, Utrecht, Netherlands; Centre for Global Change Science, MIT, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Physics, University of Toronto, Toronto, Canada; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Baray S.,Jacob D.J.,Maasakkers J.D.,et al. Estimating 2010-2015 anthropogenic and natural methane emissions in Canada using ECCC surface and GOSAT satellite observations[J],2021,21(23).
APA	Baray S..,Jacob D.J..,Maasakkers J.D..,Sheng J.-X..,Sulprizio M.P..,...&McLaren R..(2021).Estimating 2010-2015 anthropogenic and natural methane emissions in Canada using ECCC surface and GOSAT satellite observations.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(23).
MLA	Baray S.,et al."Estimating 2010-2015 anthropogenic and natural methane emissions in Canada using ECCC surface and GOSAT satellite observations".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.23(2021).