气候变化领域集成服务门户(CCPortal): Majority of US urban natural gas emissions unaccounted for in inventories

CCPortal

DOI	10.1073/pnas.2105804118
	Majority of US urban natural gas emissions unaccounted for in inventories
	Sargent M.R.; Floerchinger C.; McKain K.; Budney J.; Gottlieb E.W.; Hutyra L.R.; Rudek J.; Wofsy S.C.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:44
英文摘要	Across many cities, estimates of methane emissions from natural gas (NG) distribution and end use based on atmospheric measurements have generally been more than double bottom-up estimates. We present a top-down study of NG methane emissions from the Boston urban region spanning 8 y (2012 to 2020) to assess total emissions, their seasonality, and trends. We used methane and ethane observations from five sites in and around Boston, combined with a high-resolution transport model, to calculate methane emissions of 76 6 18 Gg/yr, with 49 6 9 Gg/yr attributed to NG losses. We found no significant trend in the NG loss rate over 8 y, despite efforts from the city and state to increase the rate of repairing NG pipeline leaks. We estimate that 2.5 6 0.5% of the gas entering the urban region is lost, approximately three times higher than bottom-up estimates. We saw a strong correlation between top-down NG emissions and NG consumed on a seasonal basis. This suggests that consumption-driven losses, such as in transmission or end-use, may be a large component of emissions that is missing from inventories, and require future policy action. We also compared top-down NG emission estimates from six US cities, all of which indicate significant missing sources in bottom-up inventories. Across these cities, we estimate NG losses from distribution and end use amount to 20 to 36% of all losses from the US NG supply chain, with a total loss rate of 3.3 to 4.7% of NG from well pad to urban consumer, notably larger than the current Environmental Protection Agency estimate of 1.4%. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Greenhouse gas emissions; Methane; Natural gas; Urban
语种	英语
scopus关键词	ethane; methane; natural gas; Article; carbon footprint; concentration (parameter); consumer; controlled study; environmental policy; environmental protection; geographic distribution; pipeline; seasonal variation; United States; urban area
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238323
作者单位	John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States; Global Monitoring Division, National Oceanic and Atmospheric Administration Earth System Research Laboratory, Boulder, CO 80305, United States; Department of Earth and Environment, Boston University, Boston, MA 02215, United States; Environmental Defense Fund, New York, NY 10010, United States
推荐引用方式 GB/T 7714	Sargent M.R.,Floerchinger C.,McKain K.,et al. Majority of US urban natural gas emissions unaccounted for in inventories[J],2021,118(44).
APA	Sargent M.R..,Floerchinger C..,McKain K..,Budney J..,Gottlieb E.W..,...&Wofsy S.C..(2021).Majority of US urban natural gas emissions unaccounted for in inventories.Proceedings of the National Academy of Sciences of the United States of America,118(44).
MLA	Sargent M.R.,et al."Majority of US urban natural gas emissions unaccounted for in inventories".Proceedings of the National Academy of Sciences of the United States of America 118.44(2021).