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A lumped bubble capacitance model controlled by matrix structure to describe layered biogenic gas bubble storage in shallow subtropical peat


Authors: Xi Chen
Owners: Xi Chen
Resource type:Composite Resource
Created:Apr 04, 2018 at 8:16 p.m.
Last updated: Apr 04, 2018 at 8:48 p.m. by Xi Chen

Abstract

Methane (CH4) accumulates in the gaseous phase in peat soils, being released to the atmosphere at rates higher than those for diffusion and plant-mediated pathways. An understanding of the mechanisms regulating gas bubble storage in peat remains incomplete. We developed a layered capacitance model to compare the bubble storage ability of peat over different depths. A peat monolith (0.395 m × 0.243 m × 0.247 m) was collected from the US Everglades and kept submerged for 102 days from a condition of minimum bubble storage to bubble saturation. Time-lapse electromagnetic wave velocity and power spectrum data were used to estimate changes in both gas content and relative average dimensions of stored bubbles with depth. Bubble capacitance, defined as the increase in volumetric gas content (m3 m-3) divided by the corresponding pressure (Pa), ranges from 3.3 × 10-4 to 6.8 × 10-4 m3 m-3 Pa-1, with a maximum at 5.5 cm depth of. Bubbles in this hotspot were larger relative to those in deeper layers, whilst the decomposition degree of the upper layers was generally smaller than that of the lower layers. X-ray computed tomography on peat sections identified a specific depth with a low void ratio, and likely regulating bubble storage. Our results suggest that bubble capacitance is related to (1) the difference in size between bubbles and peat pores, and (2) the void ratio. Our work suggests that changes in bubble size associated with variations in water level driven by climate change will modify bubble storage in peat soils.

Subject Keywords

X-ray computed tomography,Gas bubbles,Methane storage,Peat,Pore structure,Lumped capacitance model

How to cite

Chen, X. (2018). A lumped bubble capacitance model controlled by matrix structure to describe layered biogenic gas bubble storage in shallow subtropical peat, HydroShare, http://www.hydroshare.org/resource/762bbda0582744158d845afe0f6f27e0

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    Authors

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    Name Organization Address Phone Author Identifiers
    Xi Chen Department of Earth & Environmental Sciences, Rutgers University Newark, NJ 07102, USA

    Contributors

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    Name Organization Address Phone Author Identifiers
    Xavier Comas Department of Geosciences, Florida Atlantic University Davie, FL 33314, USA
    Andrew Binley Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK
    Lee Slater Department of Earth & Environmental Sciences, Rutgers University Newark, NJ 07102, USA

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