DOI: 10.1002/grl.50735
论文题名: Offshore permafrost decay and massive seabed methane escape in water depths >20 m at the South Kara Sea shelf
作者: Portnov A. ; Smith A.J. ; Mienert J. ; Cherkashov G. ; Rekant P. ; Semenov P. ; Serov P. ; Vanshtein B.
刊名: Geophysical Research Letters
ISSN: 0094-8703
EISSN: 1944-8434
出版年: 2013
卷: 40, 期: 15 起始页码: 3962
结束页码: 3967
语种: 英语
英文关键词: gas flares
; methane
; permafrost
; South Kara Sea
Scopus关键词: Continental shelves
; Gas flares
; High-resolution seismic datum
; Hydroacoustic
; Kara Sea
; Last Glacial Maximum
; Permafrost distribution
; Sea level rise
; Gases
; Methane
; Sea level
; Permafrost
; gas flow
; Last Glacial Maximum
; methane
; permafrost
; sea level change
; seafloor
; sealing
; water depth
; Arctic Ocean
英文摘要: Since the Last Glacial Maximum (∼19 ka), coastal inundation from sea-level rise has been thawing thick subsea permafrost across the Arctic. Although subsea permafrost has been mapped on several Arctic continental shelves, permafrost distribution in the South Kara Sea and the extent to which it is acting as an impermeable seal to seabed methane escape remains poorly understood. Here we use >1300 km of high-resolution seismic data to map hydroacoustic anomalies, interpreted to record seabed gas release, on the West Yamal shelf. Gas flares are widespread over an area of at least 7500 km 2 in water depths >20 m. We propose that continuous subsea permafrost extends to water depths of ∼20 m offshore and creates a seal through which gas cannot migrate. This Arctic shelf region where seafloor gas release is widespread suggests that permafrost has degraded more significantly than previously thought. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880890112&doi=10.1002%2fgrl.50735&partnerID=40&md5=6c74fec9d14ddbe2d6f2816c257cdc51
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5967
Appears in Collections: 气候减缓与适应
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作者单位: Centre for Arctic Gas Hydrate, Environment and Climate, University of Tromsø, Dramsveien 201, NO-9037 Tromsø, Norway
Recommended Citation:
Portnov A.,Smith A.J.,Mienert J.,et al. Offshore permafrost decay and massive seabed methane escape in water depths >20 m at the South Kara Sea shelf[J]. Geophysical Research Letters,2013-01-01,40(15).