Ecosystem and soil respiration radiocarbon detects old carbon release as a fingerprint of warming and permafrost destabilization with climate change

Schuur, Edward A. G.; Hicks Pries, Caitlin; Mauritz, Marguerite; Pegoraro, Elaine; Rodenhizer, Heidi; See, Craig; Ebert, Chris

doi:10.1098/rsta.2022.0201

Ecosystem and soil respiration radiocarbon detects old carbon release as a fingerprint of warming and permafrost destabilization with climate change

Journal Article · Mon Oct 09 00:00:00 EDT 2023 · Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences

DOI:https://doi.org/10.1098/rsta.2022.0201· OSTI ID:2415792

^[1]; ^[2]; Mauritz, Marguerite ^[3]; ^[4]; Rodenhizer, Heidi ^[5]; See, Craig ^[1]; Ebert, Chris ^[1]

Northern Arizona Univ., Flagstaff, AZ (United States)
Dartmouth College, Hanover, NH (United States)
Univ. of Texas at El Paso, TX (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Woodwell Climate Research Center, Falmouth, MA (United States)

The permafrost region has accumulated organic carbon in cold and waterlogged soils over thousands of years and now contains three times as much carbon as the atmosphere. Global warming is degrading permafrost with the potential to accelerate climate change as increased microbial decomposition releases soil carbon as greenhouse gases. A 19-year time series of soil and ecosystem respiration radiocarbon from Alaska provides long-term insight into changing permafrost soil carbon dynamics in a warmer world. Nine per cent of ecosystem respiration and 23% of soil respiration observations had radiocarbon values more than 50‰ lower than the atmospheric value. Furthermore, the overall trend of ecosystem and soil respiration radiocarbon values through time decreased more than atmospheric radiocarbon values did, indicating that old carbon degradation was enhanced. Boosted regression tree analyses showed that temperature and moisture environmental variables had the largest relative influence on lower radiocarbon values. This suggested that old carbon degradation was controlled by warming/permafrost thaw and soil drying together, as waterlogged soil conditions could protect soil carbon from microbial decomposition even when thawed. Overall, changing conditions increasingly favoured the release of old carbon, which is a definitive fingerprint of an accelerating feedback to climate change as a consequence of warming and permafrost destabilization.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-05CH11231; SC0006982; SC0014085; SC0020227

OSTI ID:: 2415792

Journal Information:: Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences, Journal Name: Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences Journal Issue: 2261 Vol. 381; ISSN 1364-503X

Publisher:: The Royal Society PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
arctic tundra
climate change
ecostystem respiration
isotopes
permafrost soil carbon
radiocarbon

Ecosystem and soil respiration radiocarbon detects old carbon release as a fingerprint of warming and permafrost destabilization with climate change

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References (75)

Figures / Tables (7)

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