气候变化领域集成服务门户(CCPortal): Large stocks of peatland carbon and nitrogen are vulnerable to permafrost thaw

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DOI	10.1073/pnas.1916387117
	Large stocks of peatland carbon and nitrogen are vulnerable to permafrost thaw
	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.
发表日期	2020
ISSN	0027-8424
起始页码	20438
结束页码	20446
卷号	117 期号:34
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.
英文关键词	Carbon stocks; Greenhouse gas fluxes; Nitrogen stocks; Northern peatlands; Permafrost thaw
语种	英语
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
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158959
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,...
推荐引用方式 GB/T 7714	Hugelius G.,Loisel J.,Chadburn S.,et al. Large stocks of peatland carbon and nitrogen are vulnerable to permafrost thaw[J],2020,117(34).
APA	Hugelius G..,Loisel J..,Chadburn S..,Jackson R.B..,Jones M..,...&Yu Z..(2020).Large stocks of peatland carbon and nitrogen are vulnerable to permafrost thaw.Proceedings of the National Academy of Sciences of the United States of America,117(34).
MLA	Hugelius G.,et al."Large stocks of peatland carbon and nitrogen are vulnerable to permafrost thaw".Proceedings of the National Academy of Sciences of the United States of America 117.34(2020).