Effect of temperature and atmospheric pressure on methane (CH4) ebullition from near‐surface peats
Effect of temperature and atmospheric pressure on methane (CH4) ebullition from near‐surface peats
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DOI：
10.1029/2006gl027509
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发表时间：
2006-09
影响因子：
5.2
通讯作者：
E. Kellner;A. Baird;M. Oosterwoud;K. Harrison;J. Waddington
中科院分区：
文献类型：
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作者：
E. Kellner;A. Baird;M. Oosterwoud;K. Harrison;J. Waddington
最近的研究表明，生物气泡的沸腾是甲烷从北部泥炭地转移到大气中的一个重要过程，因此需要用泥炭碳动力学模型更好地描述这一过程。我们开发并测试了一个简单的沸腾模型，在该模型中，泥炭中的气体体积必须超过阈值才能发生沸腾。该模型假定气体体积因天然气产量以及压力和温度的变化而变化。我们在实验室中培养了190天的泥炭岩芯，并测量了它们的体积气体含量和沸腾通量。实验室结果支持阈值的概念，考虑到模型的简单性，计算的沸腾与最后120天的测量通量相比较，R2为0.66。一种改进的、更现实的描述还将包括产气量和气泡保留项的时间和空间变化。
Recent studies suggest that ebullition of biogenic gas bubbles is an important process of CH4 transfer from northern peatlands into the atmosphere and, as such, needs to be better described by models of peat carbon dynamics. We develop and test a simple ebullition model in which a threshold gas volume in the peat has to be exceeded before ebullition occurs. The model assumes that the gas volume varies because of gas production and variations in pressure and temperature. We incubated peat cores in the laboratory for 190 days and measured their volumetric gas contents and the ebullition flux. The laboratory results support the threshold concept and, considering the simplicity of the model, the calculated ebullition compared well with measured fluxes during the final 120 days with an r2 of 0.66. An improved, more realistic description would also include temporal and spatial variations in gas production and bubble retention terms.