DOI: 10.1002/2013GB004571
Scopus记录号: 2-s2.0-84903875452
论文题名: Impact of changes in barometric pressure on landfill methane emission
作者: Xu L ; , Lin X ; , Amen J ; , Welding K ; , McDermitt D
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 7 起始页码: 679
结束页码: 695
语种: 英语
英文关键词: barometric pumping
; eddy covariance flux measurement
; landfill methane emission
Scopus关键词: Atmospheric pressure
; Barometers
; Methane
; Porous materials
; Uncertainty analysis
; Wetlands
; Barometric pumping
; Closed-chamber method
; Continuous measurements
; Eddy covariance method
; Environmental contexts
; Flux measurements
; Landfill methane
; Mass-balance method
; Land fill
; barometry
; eddy covariance
; flux measurement
; landfill
; methane
; pressure effect
; pumping
; Lincoln [Nebraska]
; Nebraska
; United States
英文摘要: Landfill methane emissions were measured continuously using the eddy covariance method from June to December 2010. The study site was located at the Bluff Road Landfill in Lincoln, Nebraska, USA. Our results show that landfill methane emissions strongly depended on changes in barometric pressure; rising barometric pressure suppressed the emission, while falling barometric pressure enhanced the emission, a phenomenon called barometric pumping. There was up to a 35-fold variation in day-to-day methane emissions due to changes in barometric pressure. Wavelet coherence analysis revealed a strong spectral coherency between variations of barometric pressure and methane emission at periodicities ranging from 1 day to 8 days. Power spectrum and ogive analysis showed that at least 10 days of continuous measurements was needed in order to capture 90% of the total variance in the methane emission time series at our landfill site. From our results, it is clear that point-in-time measurements taken at monthly or longer time intervals using techniques such as the trace plume method, the mass balance method, or the closed-chamber method will be subject to large variations in measured emission rates because of the barometric pumping phenomenon. Estimates of long-term integrated methane emissions from landfills based on such measurements could yield uncertainties, ranging from 28.8% underestimation to 32.3% overestimation. Our results demonstrate a need for continuous measurements to quantify annual total landfill emissions. This conclusion may apply to the study of methane emissions from wetlands, peatlands, lakes, and other environmental contexts where emissions are from porous media or ebullition. Other implications from the present study for hazard gas monitoring programs are also discussed. Key Points Landfill methane emissions strongly depend on changes in barometric pressure Current methods lead to uncertainty in estimation of annual landfill emission Continuous measurement is needed to quantify annual total landfill emission ©2014. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77538
Appears in Collections: 气候变化事实与影响
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作者单位: LI-COR Biosciences, Lincoln, NE, United States; Department of Agronomy, Kansas State University, Manhattan, AR, United States; Bluff Road Landfill, Lincoln, NE, United States
Recommended Citation:
Xu L,, Lin X,, Amen J,et al. Impact of changes in barometric pressure on landfill methane emission[J]. Global Biogeochemical Cycles,2014-01-01,28(7)