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- Title
Deglaciation-enhanced mantle CO<sub>2</sub> fluxes at Yellowstone imply positive climate feedback.
- Authors
Clerc, Fiona; Behn, Mark D.; Minchew, Brent M.
- Abstract
Mantle melt generation in response to glacial unloading has been linked to enhanced magmatic volatile release in Iceland and global eruptive records. It is unclear whether this process is important in systems lacking evidence of enhanced eruptions. The deglaciation of the Yellowstone ice cap did not observably enhance volcanism, yet Yellowstone emits large volumes of CO2 due to melt crystallization at depth. Here we model mantle melting and CO2 release during the deglaciation of Yellowstone (using Iceland as a benchmark). We find mantle melting is enhanced 19-fold during deglaciation, generating an additional 250–620 km3. These melts segregate an additional 18–79 Gt of CO2 from the mantle, representing a ~3–15% increase in the global volcanic CO2 flux (if degassed immediately). We suggest deglaciation-enhanced mantle melting is important in continental settings with partially molten mantle – including Greenland and West Antarctica – potentially implying positive feedbacks between deglaciation and climate warming. The retreat of the #Yellowstone ice cap reduced mantle pressures. Using models, we predict this enhanced mantle melting 19-fold, segregating a globally-significant mass of CO2 and potentially contributing to feedbacks between deglaciation and climate.
- Subjects
YELLOWSTONE National Park; ICELAND; CLIMATE feedbacks; VOLCANIC eruptions; GLOBAL warming; ICE caps; MELT crystallization; GLACIAL melting
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-45890-z