A scalable model for methane consumption in arctic mineral soils

Recent field studies have documented a surprisingly strong and consistent methane sink in arctic mineral soils, thought to be due to high‐affinity methanotrophy. However, the distinctive physiology of these methanotrophs is poorly represented in mechanistic methane models. We developed a new model,...

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Published inGeophysical research letters Vol. 43; no. 10; pp. 5143 - 5150
Main Authors Oh, Youmi, Stackhouse, Brandon, Lau, Maggie C. Y., Xu, Xiangtao, Trugman, Anna T., Moch, Jonathan, Onstott, Tullis C., Jørgensen, Christian J., D'Imperio, Ludovica, Elberling, Bo, Emmerton, Craig A., St. Louis, Vincent L., Medvigy, David
Format Journal Article
LanguageEnglish
Published Washington John Wiley & Sons, Inc 28.05.2016
Subjects
Affinity
arctic
Arctic soils
Biomass
Computer simulation
Constraints
Consumption
Fluctuations
Fluxes
high‐affinity methanotrophy
Hydraulics
Melting
Methane
Methane emissions
methane models
Methanotrophic bacteria
microbial biomass changes
Microorganisms
mineral cryosols
Minerals
Physiology
Seasonal variations
Seasonality
Silicon
Simulation
Soil
Soils
terrestrial methane sink
Thawing
Arctic region
PN, Arctic
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Summary:Recent field studies have documented a surprisingly strong and consistent methane sink in arctic mineral soils, thought to be due to high‐affinity methanotrophy. However, the distinctive physiology of these methanotrophs is poorly represented in mechanistic methane models. We developed a new model, constrained by microcosm experiments, to simulate the activity of high‐affinity methanotrophs. The model was tested against soil core‐thawing experiments and field‐based measurements of methane fluxes and was compared to conventional mechanistic methane models. Our simulations show that high‐affinity methanotrophy can be an important component of the net methane flux from arctic mineral soils. Simulations without this process overestimate methane emissions. Furthermore, simulations of methane flux seasonality are improved by dynamic simulation of active microbial biomass. Because a large fraction of the Arctic is characterized by mineral soils, high‐affinity methanotrophy will likely have a strong effect on its net methane flux. Key Points We developed a methane model that represents high‐affinity methanotrophy and active microbial biomass changes in arctic mineral soils High‐affinity methanotrophy facilitated accurate simulation of methane consumption in arctic mineral soils Active microbial biomass changes strongly influenced seasonal methane fluxes
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ISSN:0094-8276
1944-8007
DOI:10.1002/2016GL069049