气候变化领域集成服务门户(CCPortal): Declining, seasonal-varying emissions of sulfur hexafluoride from the United States

CCPortal

DOI	10.5194/acp-23-1437-2023
	Declining, seasonal-varying emissions of sulfur hexafluoride from the United States
	Hu, Lei; Ottinger, Deborah; Bogle, Stephanie; Montzka, Stephen A.; DeCola, Philip L.; Dlugokencky, Ed; Andrews, Arlyn; Thoning, Kirk; Sweeney, Colm; Dutton, Geoff; Aepli, Lauren; Crotwell, Andrew
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	1437
结束页码	1448
卷号	23 期号:2 页码:12
英文摘要	Sulfur hexafluoride (SF6) is the most potent greenhouse gas (GHG), and its atmospheric abundance, albeit small, has been increasing rapidly. Although SF6 is used to assess atmospheric transport modeling and its emissions influence the climate for millennia, SF6 emission magnitudes and distributions have substantial uncertainties. In this study, we used NOAA's ground-based and airborne measurements of SF6 to estimate SF6 emissions from the United States between 2007 and 2018. Our results suggest a substantial decline of US SF6 emissions, a trend also reported in the US Environmental Protection Agency's (EPA) national inventory submitted under the United Nations Framework Convention on Climate Change (UNFCCC), implying that US mitigation efforts have had some success. However, the magnitudes of annual emissions derived from atmospheric observations are 40 %-250 % higher than the EPA's national inventory and substantially lower than the Emissions Database for Global Atmospheric Research (EDGAR) inventory. The regional discrepancies between the atmosphere-based estimate and EPA's inventory suggest that emissions from electric power transmission and distribution (ETD) facilities and an SF6 production plant that did not or does not report to the EPA may be underestimated in the national inventory. Furthermore, the atmosphere-based estimates show higher emissions of SF6 in winter than in summer. These enhanced wintertime emissions may result from increased maintenance of ETD equipment in southern states and increased leakage through aging brittle seals in ETD in northern states during winter. The results of this study demonstrate the success of past US SF6 emission mitigations and suggest that substantial additional emission reductions might be achieved through efforts to minimize emissions during servicing or through improving sealing materials in ETD.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000922819900001
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/273408
作者单位	National Oceanic Atmospheric Admin (NOAA) - USA; United States Environmental Protection Agency; University System of Maryland; University of Maryland College Park; University of Colorado System; University of Colorado Boulder
推荐引用方式 GB/T 7714	Hu, Lei,Ottinger, Deborah,Bogle, Stephanie,et al. Declining, seasonal-varying emissions of sulfur hexafluoride from the United States[J],2023,23(2):12.
APA	Hu, Lei.,Ottinger, Deborah.,Bogle, Stephanie.,Montzka, Stephen A..,DeCola, Philip L..,...&Crotwell, Andrew.(2023).Declining, seasonal-varying emissions of sulfur hexafluoride from the United States.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(2),12.
MLA	Hu, Lei,et al."Declining, seasonal-varying emissions of sulfur hexafluoride from the United States".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.2(2023):12.