DOI: 10.5194/tc-8-1019-2014
Scopus记录号: 2-s2.0-84902162836
论文题名: Physical controls on the storage of methane in landfast sea ice
作者: Zhou J ; , Tison J ; -L ; , Carnat G ; , Geilfus N ; -X ; , Delille B
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 3 起始页码: 1019
结束页码: 1029
语种: 英语
英文关键词: concentration (composition)
; methane
; sea ice
; seawater
; solubilization
英文摘要: We report on methane (CH4) dynamics in landfast sea ice, brine and under-ice seawater at Barrow in 2009. The CH4 concentrations in under-ice water ranged from 25.9 to 116.4 nmol Lsw -1, indicating a supersaturation of 700 to 3100% relative to the atmosphere. In comparison, the CH4 concentrations in sea ice ranged from 3.4 to 17.2 nmol Lice -1 and the deduced CH4 concentrations in brine from 13.2 to 677.7 nmol Lbrine -1. We investigated the processes underlying the difference in CH4 concentrations between sea ice, brine and under-ice water and suggest that biological controls on the storage of CH4 in ice were minor in comparison to the physical controls. Two physical processes regulated the storage of CH4 in our landfast ice samples: bubble formation within the ice and sea ice permeability. Gas bubble formation due to brine concentration and solubility decrease favoured the accumulation of CH 4 in the ice at the beginning of ice growth. CH4 retention in sea ice was then twice as efficient as that of salt; this also explains the overall higher CH4 concentrations in brine than in the under-ice water. As sea ice thickened, gas bubble formation became less efficient, CH 4 was then mainly trapped in the dissolved state. The increase of sea ice permeability during ice melt marked the end of CH4 storage. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74838
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Laboratoire de Glaciologie, DSTE, Université Libre de Bruxelles, Brussels, Belgium; Unité d'Océanographie Chimique, MARE, Université de Liège, Liège, Belgium; Arctic Research Center, Aarhus University, Aarhus, Denmark
Recommended Citation:
Zhou J,, Tison J,-L,et al. Physical controls on the storage of methane in landfast sea ice[J]. Cryosphere,2014-01-01,8(3)