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Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands
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Understanding the glacial methane cycle.

Peter O Hopcroft1, Paul J Valdes1, Fiona M O'Connor2

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Atmospheric methane (CH4) levels fluctuated with climate over the Quaternary. Earth System models suggest reduced CH4 sources, not lifetime changes, explain glacial methane levels, but observed concentrations remain unreconciled.

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Area of Science:

  • Paleoclimatology
  • Atmospheric Chemistry
  • Earth System Science

Background:

  • Atmospheric methane (CH4) concentrations have varied significantly with climate throughout the Quaternary period.
  • Methane levels rose from 375 ppbv during the Last Glacial Maximum (LGM) 21,000 years ago to 680 ppbv before the Industrial Revolution.
  • The precise drivers behind this increase, whether source magnitudes or atmospheric lifetime, are not fully understood.

Purpose of the Study:

  • To comprehensively assess competing hypotheses for Quaternary atmospheric methane variations using an Earth System model.
  • To quantify the contributions of CH4 sources and atmospheric lifetime to glacial-interglacial methane cycles.
  • To estimate the uncertainty associated with these assessments.

Main Methods:

  • Utilized an advanced Earth System model to simulate atmospheric methane dynamics.
  • Compared model outputs with paleoclimatic data, focusing on the LGM.
  • Analyzed the sensitivity of methane concentrations to changes in source strength and atmospheric lifetime.

Main Results:

  • The model indicated a 28-46% reduction in global CH4 sources during the LGM, with a 2-8% increase in its atmospheric lifetime.
  • The best-estimate LGM CH4 concentration derived from the model was 463-480 ppbv.
  • Reconciling the observed LGM methane concentration required a much larger source reduction (46-49%), which the model could not achieve.

Conclusions:

  • The study highlights a discrepancy between model simulations and observed LGM methane concentrations.
  • Current understanding of natural methane sources, particularly wetlands under cooler, low-CO2 conditions, may be insufficient.
  • Further research is needed to accurately model the impact of past climate conditions on methane budgets.