气候变化领域集成服务门户(CCPortal): Methane emissions from groundwater pumping in the USA

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DOI	10.1038/s41612-019-0068-6
	Methane emissions from groundwater pumping in the USA
	Kulongoski J.T.; McMahon P.B.
发表日期	2019
ISSN	23973722
卷号	2 期号:1
英文摘要	Atmospheric methane accumulation contributes to climate change, hence quantifying methane emissions is essential to assess and model the impacts. Here, we estimate methane emissions from groundwater pumping in the Los Angeles Basin (LAB), north-eastern Pennsylvania, and the Principal aquifers of the USA using the average concentrations of methane in groundwater and annual groundwater pumping volumes. High average methane concentrations, 44.1 mg/L, and extensive groundwater pumping, ~3.1 × 1011 L/a in the LAB, result in the annual emission of ~2.9 × 10−3 Tg of microbial methane. Ethane emissions in the LAB were 3.5 × 10−6 Tg/a. Lower methane emissions estimated for NE Pennsylvania, ~3.0 × 10−6 Tg/a, reflect lower methane concentrations and groundwater pumping, 0.7 mg/L and 4.27 × 109 L/a, respectively. Methane concentrations and groundwater withdrawals, 1.06 × 1014 L/a, across the USA enabled the estimation of the total emissions of methane from Principal aquifers (92% of total pumping) of 0.044 Tg/a in the year 2000, which represents a small percentage (~0.2%) of the total annual US methane emissions, but a previously unquantified flux in the global methane budget. Globally, groundwater-pumping methane emissions were estimated to be 0.53 Tg/a, 0.2% of global methane emissions, by adopting a global estimate for groundwater extraction, and an average methane concentration in older groundwater of 0.44 mg/L. © 2019, The Author(s).
语种	英语
scopus关键词	climate change; concentration (composition); estimation method; groundwater; methane; pumping; California; Los Angeles Basin; Pennsylvania; United States
来源期刊	npj Climate and Atmospheric Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178069
作者单位	U.S. Geological Survey, California Water Science Center, San Diego, CA 92101, United States; U.S. Geological Survey, Colorado Water Science Center, Denver, CO 80225, United States
推荐引用方式 GB/T 7714	Kulongoski J.T.,McMahon P.B.. Methane emissions from groundwater pumping in the USA[J],2019,2(1).
APA	Kulongoski J.T.,&McMahon P.B..(2019).Methane emissions from groundwater pumping in the USA.npj Climate and Atmospheric Science,2(1).
MLA	Kulongoski J.T.,et al."Methane emissions from groundwater pumping in the USA".npj Climate and Atmospheric Science 2.1(2019).