DOI: 10.5194/hess-18-953-2014
Scopus记录号: 2-s2.0-84896761315
论文题名: Using hydrologic measurements to investigate free-phase gas ebullition in a Maine peatland, USA
作者: Bon C ; E ; , Reeve A ; S ; , Slater L ; , Comas X
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 3 起始页码: 953
结束页码: 965
语种: 英语
Scopus关键词: Excess pore water pressure
; Geochemical conditions
; High permeability
; Hydraulic heads
; Hydrologic measurements
; Nutrient supply
; Preferential flows
; Rising water table
; Atmospheric pressure
; Climate change
; Digital storage
; Groundwater
; Groundwater flow
; Methane
; Peat
; Wetlands
; atmospheric pressure
; biogenic emission
; climate change
; concentration (composition)
; esker
; gas flow
; gas production
; groundwater flow
; hydraulic head
; hydrological change
; methane
; methanogenesis
; nutrient availability
; peatland
; permeability
; pool
; porewater
; preferential flow
; water table
; Caribou Bog
; Maine
; United States
英文摘要: Northern peatlands cover more than 350 million ha and are an important source of methane (CH4) and other biogenic gases contributing to climate change. Free-phase gas (FPG) accumulation and episodic release has recently been recognized as an important mechanism for biogenic gas flux from peatlands. It is likely that gas production and groundwater flow are interconnected in peatlands: groundwater flow influences gas production by regulating geochemical conditions and nutrient supply available for methanogenesis, while FPG influences groundwater flow through a reduction in peat permeability and by creating excess pore water pressures. Water samples collected from three well sites at Caribou Bog, Maine, show substantial dissolved CH4 (5-16 mg L-1) in peat waters below 2 m depth and an increase in concentrations with depth. This suggests production and storage of CH4 in deep peat that may be episodically released as FPG. Two min increment pressure transducer data reveal approximately 5 cm fluctuations in hydraulic head from both deep and shallow peat that are believed to be indicative of FPG release. FPG release persists up to 24 h during decreasing atmospheric pressure and a rising water table. Preferential flow is seen towards an area of relatively lower hydraulic head associated with the esker and pool system. Increased CH4 concentrations are also found at the depth of the esker crest, suggesting that the high permeability esker is acting as a conduit for groundwater flow, driving a downward transport of labile carbon, resulting in higher rates of CH4 production. © 2014 Author (s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78302
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Earth and Climate Sciences, University of Maine, Orono, ME 04469-5790, United States; Department of Earth and Environmental Sciences, Rutgers University, Newark, NJ 07102, United States; Department of Geosciences, Florida Atlantic University, Davie, FL 33314, United States
Recommended Citation:
Bon C,E,, Reeve A,et al. Using hydrologic measurements to investigate free-phase gas ebullition in a Maine peatland, USA[J]. Hydrology and Earth System Sciences,2014-01-01,18(3)