Author
Listed:
- Youmi Oh
(Purdue University)
- Qianlai Zhuang
(Purdue University
Purdue Climate Change Research Center
Purdue University)
- Licheng Liu
(Purdue University)
- Lisa R. Welp
(Purdue University
Purdue Climate Change Research Center)
- Maggie C. Y. Lau
(Princeton University
Chinese Academy of Sciences)
- Tullis C. Onstott
(Princeton University)
- David Medvigy
(University of Notre Dame)
- Lori Bruhwiler
(Global Monitoring Division)
- Edward J. Dlugokencky
(Global Monitoring Division)
- Gustaf Hugelius
(Stockholm University)
- Ludovica D’Imperio
(University of Copenhagen)
- Bo Elberling
(University of Copenhagen)
Abstract
Methane emissions from organic-rich soils in the Arctic have been extensively studied due to their potential to increase the atmospheric methane burden as permafrost thaws1–3. However, this methane source might have been overestimated without considering high-affinity methanotrophs (HAMs; methane-oxidizing bacteria) recently identified in Arctic mineral soils4–7. Herein we find that integrating the dynamics of HAMs and methanogens into a biogeochemistry model8–10 that includes permafrost soil organic carbon dynamics3 leads to the upland methane sink doubling (~5.5 Tg CH4 yr−1) north of 50 °N in simulations from 2000–2016. The increase is equivalent to at least half of the difference in net methane emissions estimated between process-based models and observation-based inversions11,12, and the revised estimates better match site-level and regional observations5,7,13–15. The new model projects doubled wetland methane emissions between 2017–2100 due to more accessible permafrost carbon16–18. However, most of the increase in wetland emissions is offset by a concordant increase in the upland sink, leading to only an 18% increase in net methane emission (from 29 to 35 Tg CH4 yr−1). The projected net methane emissions may decrease further due to different physiological responses between HAMs and methanogens in response to increasing temperature19,20.
Suggested Citation
Youmi Oh & Qianlai Zhuang & Licheng Liu & Lisa R. Welp & Maggie C. Y. Lau & Tullis C. Onstott & David Medvigy & Lori Bruhwiler & Edward J. Dlugokencky & Gustaf Hugelius & Ludovica D’Imperio & Bo Elber, 2020.
"Reduced net methane emissions due to microbial methane oxidation in a warmer Arctic,"
Nature Climate Change, Nature, vol. 10(4), pages 317-321, April.
Handle:
RePEc:nat:natcli:v:10:y:2020:i:4:d:10.1038_s41558-020-0734-z
DOI: 10.1038/s41558-020-0734-z
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Cited by:
- Jaehyun Lee & Youmi Oh & Sang Tae Lee & Yeon Ok Seo & Jeongeun Yun & Yerang Yang & Jinhyun Kim & Qianlai Zhuang & Hojeong Kang, 2023.
"Soil organic carbon is a key determinant of CH4 sink in global forest soils,"
Nature Communications, Nature, vol. 14(1), pages 1-8, December.
- Chin-Hsien Cheng & Simon A. T. Redfern, 2022.
"Impact of interannual and multidecadal trends on methane-climate feedbacks and sensitivity,"
Nature Communications, Nature, vol. 13(1), pages 1-11, December.
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