Journal
SCIENCE
Volume 367, Issue 6480, Pages 907-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aax0504
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Funding
- NSF [PLR-1245659, PLR-1245821, PLR-1246148]
- Packard Fellowship for Science and Engineering
- European Research Council (ERC) under the European Union's Seventh Framework Programme FP7/2007-2013 ERC Grant [226172]
- Swiss National Science Foundation [200020_172506]
- Australian Government for the Centre for Accelerator Science at ANSTO through the National Collaborative Research Infrastructure Strategy
- National Institute of Water and Atmospheric Research through the Greenhouse Gases, Emissions and Carbon Cycle Science Program
- NERC [bas0100034] Funding Source: UKRI
- Swiss National Science Foundation (SNF) [200020_172506] Funding Source: Swiss National Science Foundation (SNF)
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Permafrost and methane hydrates are large, climate-sensitive old carbon reservoirs that have the potential to emit large quantities of methane, a potent greenhouse gas, as the Earth continues to warm. We present ice core isotopic measurements of methane (Delta C-14, delta C-13, and delta D) from the last deglaciation, which is a partial analog for modern warming. Our results show that methane emissions from old carbon reservoirs in response to deglacial warming were small (<19 teragrams of methane per year, 95% confidence interval) and argue against similar methane emissions in response to future warming. Our results also indicate that methane emissions from biomass burning in the pre-Industrial Holocene were 22 to 56 teragrams of methane per year (95% confidence interval), which is comparable to today.
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