DOI: 10.1002/2016GL068668
论文题名: Ephemerality of discrete methane vents in lake sediments
作者: Scandella B.P. ; Pillsbury L. ; Weber T. ; Ruppel C. ; Hemond H.F. ; Juanes R.
刊名: Geophysical Research Letters
ISSN: 0094-9048
EISSN: 1944-8779
出版年: 2016
卷: 43, 期: 9 起始页码: 4374
结束页码: 4381
语种: 英语
英文关键词: ebullition
; hydroacoustics
; methane emissions
; methane venting
; sonar
Scopus关键词: Global warming
; Greenhouse gases
; Hydrostatic pressure
; Lakes
; Sediments
; Sonar
; Underwater acoustics
; Vents
; Ebullition
; High resolution
; Methane emissions
; Methane venting
; Multibeam sonar
; Spatial patterns
; Spatial structure
; Spatiotemporal characteristics
; Methane
; acoustic method
; carbon emission
; dissolution
; global warming
; hydrostatic pressure
; lacustrine deposit
; methane
; multibeam sonar
; sediment pollution
; venting
; water column
英文摘要: Methane is a potent greenhouse gas whose emission from sediments in inland waters and shallow oceans may both contribute to global warming and be exacerbated by it. The fraction of methane emitted by sediments that bypasses dissolution in the water column and reaches the atmosphere as bubbles depends on the mode and spatiotemporal characteristics of venting from the sediments. Earlier studies have concluded that hot spots - persistent, high-flux vents - dominate the regional ebullitive flux from submerged sediments. Here the spatial structure, persistence, and variability in the intensity of methane venting are analyzed using a high-resolution multibeam sonar record acquired at the bottom of a lake during multiple deployments over a 9 month period. We confirm that ebullition is strongly episodic, with distinct regimes of high flux and low flux largely controlled by changes in hydrostatic pressure. Our analysis shows that the spatial pattern of ebullition becomes homogeneous at the sonar's resolution over time scales of hours (for high-flux periods) or days (for low-flux periods), demonstrating that vents are ephemeral rather than persistent, and suggesting that long-term, lake-wide ebullition dynamics may be modeled without resolving the fine-scale spatial structure of venting. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84992311396&doi=10.1002%2f2016GL068668&partnerID=40&md5=7c255b1bb6a29e2fed87a8061fe284da
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10011
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Scandella B.P.,Pillsbury L.,Weber T.,et al. Ephemerality of discrete methane vents in lake sediments[J]. Geophysical Research Letters,2016-01-01,43(9).