DOI: 10.1002/2015GL065034
论文题名: Methane emission bursts from permafrost environments during autumn freeze-in: New insights from ground-penetrating radar
作者: Pirk N. ; Santos T. ; Gustafson C. ; Johansson A.J. ; Tufvesson F. ; Parmentier F.-J.W. ; Mastepanov M. ; Christensen T.R.
刊名: Geophysical Research Letters
ISSN: 0094-9147
EISSN: 1944-8878
出版年: 2015
卷: 42, 期: 16 起始页码: 6732
结束页码: 6738
语种: 英语
英文关键词: autumn freeze-in
; frequency domain
; Greenland
; ground-penetrating radar
; methane
Scopus关键词: Frequency domain analysis
; Gas emissions
; Ground penetrating radar systems
; Ionization of gases
; Methane
; Permafrost
; Radar
; Soil mechanics
; Soil moisture
; Soils
; Dielectric characterization
; Frequency domains
; Greenland
; Ground Penetrating Radar
; Measurement techniques
; Permafrost environment
; Ultra-wide band ground penetrating radar
; Volumetric composition
; Geological surveys
; autumn
; emission inventory
; freezing
; ground penetrating radar
; methane
; permafrost
; reservoir
; soil analysis
; Arctic
; Greenland
英文摘要: Large amounts of methane (CH4) are known to be emitted from permafrost environments during the autumn freeze-in, but the specific soil conditions leading up to these bursts are unclear. Therefore, we used an ultrawide band ground-penetrating radar in Northeast Greenland in autumn 2009 to estimate the volumetric composition inside the soil through dielectric characterization from 200 to 3200 MHz. Our results suggest a compression of the gas reservoir during the phase transition of soil water, which is accompanied by a peak in surface CH4 emissions. About 1 week thereafter, there seems to be a decompression event, consistent with ground cracking which allows the gas reservoir to expand again. This coincides with the largest CH4 emission, exceeding the summer maximum by a factor of 4. We argue that these complementary measurement techniques are needed to come to an understanding of tundra CH4 bursts connected to soil freezing. © 2015. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84941734654&doi=10.1002%2f2015GL065034&partnerID=40&md5=e8cf4300f2058fc53f49878ff890482e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8763
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 Physical Geography and Ecosystem Science, Lund University, Lund, Sweden
Recommended Citation:
Pirk N.,Santos T.,Gustafson C.,et al. Methane emission bursts from permafrost environments during autumn freeze-in: New insights from ground-penetrating radar[J]. Geophysical Research Letters,2015-01-01,42(16).