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07:26
Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands
Published on: January 31, 2025
976
Ice-sheet-driven methane storage and release in the Arctic.
Alexey Portnov1, Sunil Vadakkepuliyambatta1, Jürgen Mienert1
1CAGE-Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geology, UiT The Arctic University of Norway, 9037 Tromsø, Norway.
Nature Communications
|January 8, 2016
Summary
Ancient methane release from the Arctic seabed has been ongoing for millennia, predating modern ocean warming. This study reveals a persistent methane release window beneath ice sheets, expanding with deglaciation.
Area of Science:
- Geosciences
- Climate Science
- Marine Geology
Background:
- Ocean warming drives gas hydrate dissociation and methane release.
- Methane expulsion sites suggest long-term, multi-millennial gas release.
- Arctic margins are sensitive to climate change and ice sheet dynamics.
Purpose of the Study:
- To investigate the long-term methane release from Arctic continental margins.
- To model the subglacial and subsea gas hydrate stability zones under past ice sheets.
- To understand the role of deglaciation in Arctic methane release.
Main Methods:
- Synthesis of observations of ~1,900 fluid escape features (pockmarks, gas flares).
- Ice-sheet thermomechanical modeling.
- Gas hydrate stability zone modeling.
Main Results:
- A significant subglacial gas hydrate stability zone existed beneath the ice sheet, acting as a methane sink.
- Methane release occurred through a persistent 20-km-wide window between subsea and subglacial stability zones.
- This methane release window widened in response to post-glacial warming and deglaciation.
Conclusions:
- Arctic methane release is a long-term process, not solely driven by recent warming.
- Deglaciation significantly influenced methane release dynamics on the Arctic shelf.
- Understanding these ancient methane release mechanisms is crucial for assessing future climate feedbacks.
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