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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Seasonal geophysical monitoring of biogenic gases in a northern peatland: Implications for temporal and spatial variability in free phase gas production rates
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Seasonal geophysical monitoring of biogenic gases in a northern peatland: Implications for temporal and spatial variability in free phase gas production rates

机译：北部泥炭地中生物气体的季节性地球物理监测：对自由相气体生产率的时空变化的影响

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A set of high resolution surface ground penetrating radar (GPR) surveys, combined with elevation rod (to monitor surface deformation) and gas flux measurements, were used to investigate in situ biogenic gas dynamics within a northern peatland (Caribou Bog, Maine). Gas production rates were directly estimated from the time series of GPR measurements. Spatial variability in gas production was also investigated by comparing two sites with different geological and ecological attributes, showing differences and/or similarities depending on season. One site characterized by thick highly humified peat deposits (5–6 m), wooded heath vegetation and open pools showed large ebullition events during the summer season, with estimated emissions (based on an assumed range of CH4 concentration) between 100 and 172 g CH4 m?2 during a single event. The other site characterized by thinner less humified peat deposits (2–3 m) and shrub vegetation showed much smaller ebullition events during the same season (between 13 and 23 g CH4 m?2). A consistent period of free-phase gas (FPG) accumulation during the fall and winter, enhanced by the frozen surficial peat acting as a confining layer, was followed by a decrease in FPG after the snow/ice melt that released estimated fluxes between 100 and 200 g CH4 m?2 from both sites. Estimated FPG production rates during periods of biogenic gas accumulation ranged between 0.22 and 2.00 g CH4 m3 d?1 and reflected strong seasonal and spatial variability associated with differences in temperature, peat soil properties, and/or depositional attributes (e.g., stratigraphy). Periods of decreased atmospheric pressure coincided with short-period increases in biogenic gas flux, including a very rapid decrease in FPG content associated with an ebullition event that released an estimated 39 and 67 g CH4 m?2 in less than 3.5 hours. These results provide insights into the spatial and seasonal variability in production and emission of biogenic gases from northern peatlands.
机译：一组高分辨率地面探地雷达（GPR）调查与仰角杆（以监测表面变形）和气体通量测量相结合，用于调查北部泥炭地（缅因州里里博格）内的原位生物成因气体动力学。根据GPR测量的时间序列直接估算出产气量。还通过比较具有不同地质和生态属性的两个地点来研究天然气生产的空间变异性，显示出不同季节的差异和/或相似性。一个特点是高度腐化的泥炭沉积物（5–6 m），树木茂盛的荒地植被和开放水池的站点在夏季表现出大的沸腾事件，估计排放量（基于CH4浓度的假定范围）在100至172 g CH4之间在一次比赛中m？2。另一个以较少的腐殖质泥炭沉积（2-3 m）和灌木植被为特征的站点在同一季节（13至23 g CH4 m？2之间）显示出较小的沸腾事件。在秋季和冬季，由于冻结的表层泥炭起着限制层的作用，游离相气体（FPG）的积累持续了一个稳定的时期，随后冰雪融化后释放出估计的通量为100至200克之间的FPG下降。来自两个站点的200 g CH4 m？2。在生物气积聚期间估计的FPG生产率在0.22至2.00 g CH4 m3 d？1之间，反映出与温度，泥炭土特性和/或沉积属性（例如地层）差异相关的强烈的季节和空间变化。大气压力下降的时期与生物气体通量的短期增加相吻合，其中包括与沸腾事件相关的FPG含量非常迅速的下降，该事件在不到3.5小时的时间内释放了39 g和67 g CH4 m2。这些结果提供了对北部泥炭地生产和排放生物气的空间和季节变化的见解。

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