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  11. Microbial And Chemical Predictors Of Methane Release From A Stratified Thermokarst Permafrost Hotspot

Microbial and chemical predictors of methane release from a stratified thermokarst permafrost hotspot

Kevin S Rozmiarek1,2, Jihoon Yang3, Jenna Schambach4

  • 1Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States.

Frontiers in Microbiology
|October 27, 2025

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Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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View abstract on PubMed

Summary
This summary is machine-generated.

Volatile organic compounds (VOCs) can indicate methane (CH₄) production in thawing permafrost. This study found VOCs signal microbial activity, improving CH₄ emission predictions from Arctic soils.

Area of Science:

  • Environmental Science
  • Microbiology
  • Geochemistry

Background:

  • Soils are key sources/sinks of methane (CH₄), with microbial processes poorly understood in thawing permafrost.
  • Accurate quantification of microbial activity is vital for predicting CH₄ emissions under changing temperatures.

Purpose of the Study:

  • To explore volatile organic compounds (VOCs) as early chemical indicators of microbial processes driving CH₄ production in thermokarst-associated CH₄ hotspots.
  • To investigate the impact of temperature on microbial communities and CH₄ production in permafrost soils.

Main Methods:

  • Field surveys at Big Trail Lake, Alaska, identified CH₄ emission zones.
  • Laboratory microcosms simulated freeze-thaw cycles at varying temperatures (-4 °C, 5 °C, 12 °C) and depths (50, 200, 400 cm).
Keywords:
biogeochemical modelingcarbon cyclingmethane hotspotmethane isotopes

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  • Analyzed CH₄ flux, microbial community shifts, VOC profiles, and carbon isotopic enrichment.

    • Main Results:

    • Methane flux increased significantly with temperature, with *Methanosarcina* spp. dominating methanogenesis at 200 cm.
    • VOC profiles showed depth- and temperature-dependent patterns, with 50 cm exhibiting highest diversity.
    • VOC signatures in 200 cm soils overlapped with *Methanosarcina acetivorans* cultures, linking VOCs to active methanogenesis.
    • High Q₁₀ values indicated strong temperature responsiveness of Arctic methanogens.

    Conclusions:

    • VOCs serve as effective biomarkers for subsurface microbial activation and CH₄ hotspot formation.
    • Temperature-sensitive anaerobic oxidation of methane influences isotopic signatures.
    • Integrating VOC and microbial data into models is crucial for predicting CH₄ release from thawing permafrost.
    methanotrophy
    microbial VOCs
    permafrost thaw
    thermokarst soils