globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1916387117
论文题名:
Large stocks of peatland carbon and nitrogen are vulnerable to permafrost thaw
作者: Hugelius G.; Loisel J.; Chadburn S.; Jackson R.B.; Jones M.; MacDonald G.; Marushchak M.; Olefeldt D.; Packalen M.; Siewert M.B.; Treat C.; Turetsky M.; Voigt C.; Yu Z.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:34
起始页码: 20438
结束页码: 20446
语种: 英语
英文关键词: Carbon stocks ; Greenhouse gas fluxes ; Nitrogen stocks ; Northern peatlands ; Permafrost thaw
Scopus关键词: carbon ; carbon dioxide ; methane ; nitrogen ; nitrous oxide ; Article ; atmosphere ; carbon balance ; carbon footprint ; controlled study ; greenhouse effect ; machine learning ; nitrogen balance ; peatland ; permafrost ; priority journal ; radiative forcing ; thawing ; warming
英文摘要: Northern peatlands have accumulated large stocks of organic carbon (C) and nitrogen (N), but their spatial distribution and vulnerability to climate warming remain uncertain. Here, we used machine-learning techniques with extensive peat core data (n > 7,000) to create observation-based maps of northern peatland C and N stocks, and to assess their response to warming and permafrost thaw. We estimate that northern peatlands cover 3.7 ± 0.5 million km2 and store 415 ± 150 Pg C and 10 ± 7 Pg N. Nearly half of the peatland area and peat C stocks are permafrost affected. Using modeled global warming stabilization scenarios (from 1.5 to 6 °C warming), we project that the current sink of atmospheric C (0.10 ± 0.02 Pg C·y-1) in northern peatlands will shift to a C source as 0.8 to 1.9 million km2 of permafrost-affected peatlands thaw. The projected thaw would cause peatland greenhouse gas emissions equal to ∼1% of anthropogenic radiative forcing in this century. The main forcing is from methane emissions (0.7 to 3 Pg cumulative CH4-C) with smaller carbon dioxide forcing (1 to 2 Pg CO2-C) and minor nitrous oxide losses. We project that initial CO2-C losses reverse after ∼200 y, as warming strengthens peatland C-sinks. We project substantial, but highly uncertain, additional losses of peat into fluvial systems of 10 to 30 Pg C and 0.4 to 0.9 Pg N. The combined gaseous and fluvial peatland C loss estimated here adds 30 to 50% onto previous estimates of permafrost-thaw C losses, with southern permafrost regions being the most vulnerable. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164077
Appears in Collections:气候变化与战略

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作者单位: Hugelius, G., Department of Physical Geography, Stockholm University, Stockholm, 106 91, Sweden, Bolin Centre for Climate Research, Stockholm University, Stockholm, 106 91, Sweden, Department of Earth System Science, Stanford University, Stanford, CA 94305, United States; Loisel, J., Department of Geography, Texas A&M University, College Station, TX 77843, United States; Chadburn, S., Department of Mathematics, University of Exeter, Exeter, EX4 4QE, United Kingdom; Jackson, R.B., Department of Earth System Science, Stanford University, Stanford, CA 94305, United States, Woods Institute for the Environment, Precourt Institute for Energy, Stanford University, Stanford, CA 94305, United States; Jones, M., Florence Bascom Geoscience Center, US Geological Survey, Reston, VA 20192, United States; MacDonald, G., Department of Geography, University of California, Los Angeles, CA 90095-1524, United States; Marushchak, M., Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, FI-40014, Finland; Olefeldt, D., Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2R3, Canada; Packalen, M., Department of Geography, University of Toronto, Toronto, ON M5S 3G3, Canada; Siewert, M.B., Department of Ecology and Environmental Science, Umeå University, Umeå, 907 36, Sweden; Treat, C., Earth Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824, United States; Turetsky, M., Department of Integrative Biology, University of Guelph, Guelph, ON N1G 2W1, Canada, Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, United States; Voigt, C., Department of Geography, University of Montreal, Montreal, QC H2V 0B3, Canada; Yu, Z., Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, United States, Institute for Peat and Mire Research, School of Geographical Sciences, Northeast Normal University, Changchun, 130024, China

Recommended Citation:
Hugelius G.,Loisel J.,Chadburn S.,et al. Large stocks of peatland carbon and nitrogen are vulnerable to permafrost thaw[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(34)
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